Mackie HR624 MK2 User Manual

O WNER’S MANUAL

HR624 MK2

High Resolution Active Studio Monitor

2

HR624 MK2

HR624 MK2

IMPORTANT SAFETY INSTRUCTIONS

PORTABLE CART

WARNING

CAUTION AVIS

RISK OF ELECTRIC SHOCK. DO NOT OPEN

RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (OR BACK)

NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL

ATTENTION: POUR EVITER LES RISQUES DE CHOC ELECTRIQUE, NE PAS ENLEVER LE COUVERCLE.

AUCUN ENTRETIEN DE PIECES INTERIEURES PAR L'USAGER.

CONFIER L'ENTRETIEN AU PERSONNEL QUALIFIE.

AVIS: POUR EVITER LES RISQUES D'INCENDIE OU D'ELECTROCUTION, N'EXPOSEZ PA S CET ARTICLE

A LA PLUIE OU A L'HUMIDITE

The lightning flash with arrowhead symbol within an equilateral triangle is
intended to alert the user to the presence of uninsulated "dangerous
voltage" within the product's enclosure, that may be of sufficient magnitude
to constitute a risk of electric shock to persons.

Le symbole éclair avec point de flèche à l'intérieur d'un triangle équilatéral
est utilisé pour alerter l'utilisateur de la présence à l'intérieur du coffret de
"voltage dangereux" non isolé d'ampleur suffisante pour constituer un risque
d'éléctrocution.

The exclamation point within an equilateral triangle is intended to alert the
user of the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.

Le point d'exclamation à l'intérieur d'un triangle équilatéral est employé
pour alerter les utilisateurs de la présence d'instructions importantes pour le
fonctionnement et l'entretien (service) dans le livret d'instruction
accompagnant l'appareil.

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with dry cloth. Use a non-scratch cloth to protect the finish.

7. Do not block any ventilation openings. Install in accordance with the

manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers,

stoves, or other apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type

plug. A polarized plug has two blades with one wider than the other.
A grounding-type plug has two blades and a third grounding prong.
The wide blade or the third prong are provided for your safety. If the
provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.

10.

Protect the power cord from being walked on or pinched particularly at

plugs, convenience receptacles, and the point where they exit from the
apparatus.

11.

Only use attachments/accessories specified by the manufacturer.

12.

Use only with a cart, stand, tripod, bracket, or

table specified by the manufacturer, or sold with
the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to
avoid injury from tip-over.

13.

Unplug this apparatus during lightning storms or when unused for long

periods of time.

14.

Refer all servicing to qualified service personnel. Servicing is required

when the apparatus has been damaged in any way, such as power­supply cord or plug is damaged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been exposed to rain or
moisture, does not operate normally, or has been dropped.

15.

This apparatus shall not be exposed to dripping or splashing, and no

object filled with liquids, such as vases, shall be placed on the apparatus.

16.

Note that this apparatus is not completely disconnected from the AC

mains service when the power switch is in the OFF position.

17.

The MAINS plug or an appliance coupler is used as the disconnect
device, so the disconnect device shall remain readily operable.

18.

Exposure to extremely high noise levels may cause permanent hearing

loss. Individuals vary considerably in susceptibility to noise-induced
hearing loss, but nearly everyone will lose some hearing if exposed to
sufficiently intense noise for a period of time. The U.S. Government’s
Occupational Safety and Health Administration (OSHA) has specified
the permissible noise level exposures shown in the following chart.

According to OSHA, any exposure in excess of these permissible limits

could result in some hearing loss. To ensure against potentially danger­ous exposure to high sound pressure levels, it is recommended that all
persons exposed to equipment capable of producing high sound pres­sure levels use hearing protectors while the equipment is in operation.
Ear plugs or protectors in the ear canals or over the ears must be worn
when operating the equipment in order to prevent permanent hearing
loss if exposure is in excess of the limits set forth here.

Correct disposal of this product. This symbol indicates that this product should not be disposed of with your household waste, according to the WEEE Directive (2002/96/EC) and your national law. This product
should be handed over to an authorized collection site for recycling waste electrical and electronic equipment (EEE). Improper handling of this type of waste could have a possible negative impact on the environment and
human health due to potentially hazardous substances that are generally associated with EEE. At the same time, your cooperation in the correct disposal of this product will contribute to the effective usage of natural
resources. For more information about where you can drop off your waste equipment for recycling, please contact your local city office, waste authority, or your household waste disposal service.

Duration,
per day in
hours
8 90 Duo in small club
6 92
4 95 Subway Train
3 97
2 100 Very loud classical music

1.5 102
1 105 Matt screaming at Troy about

0.5 110

0.25 or less 115 Loudest parts at a rock concert

Sound Level
dBA, Slow
Response

Typical Example

deadlines

WARNING — To reduce the risk of fire or electric shock, do not

expose this apparatus to rain or moisture.

3

Owner’s Manual

Owner’s Manual

INTRODUCTION

Tweeter

Woofer

Passive Radiator

Power Amplifier/
Crossover Assembly

• The ampliers are designed to provide maximum
acoustic output from the speakers, yet minimize
the danger of speaker damage due to overdriving.

Thank you for choosing the Mackie HR624 MK2 Studio
Monitors. We began producing the original HR624
Studio Monitors in 2001, the baby brother to our agship
HR824 Studio Monitors. The HR624 MK2s have been
redesigned with modern components for improved
accuracy and an extended low-frequency response.

Investments in Excellence...

When we decided it was time to update the HR624s,
we turned to our expert loudspeaker and transducer
design engineering team at EAW to determine how to
make an already excellent studio monitor even better.
The rst thing they noticed was that the front bafe
could be redesigned with a rounder aluminum
construction to further reduce edge diffraction for
improved imaging. The volume of the cabinet was
increased slightly to improve the low-frequency
response. The ampliers have been adjusted with all
new ‘voicing’ to match the new cabinets. However, the
ampliers’ design is fundamentally the same and has a
very similar characteristic to the original model. If you
are upgrading from the original HR624s, you won’t have
to relearn the sound. The MK2s still deliver the clarity,
ultra-linear frequency response, and broad stereo
imaging of the originals.

An elegant piano-black gloss nish emphasizes that
these studio monitors are in a class by themselves,
pleasing to the most discerning eye as well as the most
discerning ear.

The result? The HR624 MK2 Studio Monitors are
extremely accurate and versatile, loaded with unique
controls that allow you to ne-tune the sound to match
your individual environment precisely. You’re gonna love
these!

• In addition, the ampliers’ gain and frequency
responses are individually hand-trimmed to
compensate for typical manufacturing tolerances
between the drivers and produce a smooth
frequency response from 45 Hz to 20 kHz.

• The connecting wires between the amplier outputs
and the drivers are kept to an absolute minimum,
so the damping factor of the amplier isn’t
compromised by the resistance of long speaker
cables.

• The acoustic sum of the outputs from the two
drivers are optimized electronically, as well as
physically, so the amplitude response is unity and
the phase difference is minimal.

In short, all the complex interconnected components
in the system are designed to work in harmony with
each other to produce the best possible sound.

The Transducers...

The monitors feature a 6.7-inch high-precision, low­distortion woofer and a 1-inch ferrouid cooled titanium
dome tweeter on the front, and a 6-inch x 9-inch
elliptical at piston passive radiator in the back.

The high-frequency driver is mounted on a massive,
acoustically non-resonant die-cast aluminum
exponential waveguide, which results in wide,
controlled
unique passive
response down to 45 Hz – an astounding
accomplishment for a cabinet of this size! And since
the radiator is producing most of the sound at the
lowest frequencies, there is very little distortion from
the woofer because its cone movement is minimal at
those frequencies.

dispersion of high-frequency sounds. The

radiator design provides a smooth

What are they? The Advantages...

The HR624 MK2 Studio Monitors are high­resolution
employing a 6th-order Butterworth system with a
built-in rear-ring mass-loaded passive radiator.
Whew! There are many benets to integrating an
active crossover, power ampliers, and drivers into
a single cabinet, and we’ve taken full advantage of
these benets in the design of the HR624 MK2.

•

, two-way, bi-amplied, active monitors

The crossover point is designed so that the

high- and low-frequency drivers are fed only the
frequencies they are best able to reproduce.

Figure 1. HR624 MK2 Cutaway side view

4

HR624 MK2

HR624 MK2

The Cabinet...

The cabinet is made of MDF with a high-gloss piano­black nish. Internal bracing increases the strength and
rigidity (stiffness) of the box. An open-cell adiabatic
foam material lls the inside of the box to absorb
internal reections and dampen standing waves.
Mounting hardware is installed on the bottom of the
cabinet that ts the WB-60 OmniMount wall-mount
bracket.

Power Ampliers...

The low-frequency amplier produces up to 100 watts
continuous before clipping, while the high-frequency
amplier produces up to 40 watts continuous.

QUICK START

We realize that you can’t wait to hook
up your new Mackie HR624 MK2 High
Resolution Studio Monitors and try
them out. Nevertheless, please take
the time to read this page NOW, and
the rest can wait until you’re good
and ready.

1. Connect the line-level monitor signal from your mixer,
preamp, or other signal source to the SIGNAL INPUT
[1] jack on the HR624 MK2 Studio Monitor (1⁄4-inch
PHONE, XLR, or RCA).

2. Connect the supplied AC power cord to the IEC socket
[7] on the back of the monitor. Plug the other end into
an AC outlet properly congured with the voltage
corresponding to the Voltage Selector Switch [11]
setting.

3. Set the POWER MODE [6] switch on the rear panel to
the ON position. With the front panel power switch [9]
out, the power amplier is in Standby mode.

4. Start your signal source (tape deck, CD, DAW, or
whatever), but leave the master volume control on your
mixer or preamp down.

5. Push in the power switch [9] on the front of the HR624
MK2. The power ring [10] around the switch will
illuminate.

6. Slowly turn up the INPUT SENSITIVITY [2] control on
the back of the monitor to its fully clockwise position
(NORMAL).

7. Adjust the master volume on your mixer to a
comfortably loud listening level. Enjoy the silky smooth
highs and authoritative, commanding lows of the
HR624 MK2. Then read the rest of this manual.

AN EXTREMELY IMPORTANT NOTE

Make sure the Voltage Selector
Switch [11] on the bottom of the
cabinet is set to the correct voltage
setting for your AC Mains supply.

Each of the HR624 MK2 cabinets has its own
built-in power ampliers. That’s right, two ampliers
per speaker cabinet; one for the high-frequency tweeter
and one for the low-frequency woofer. You should turn
the INPUT SENSITIVITY [2] control on the back of the
cabinet down (fully counterclockwise) before turning
on the Studio Monitors for the rst time. Also be sure
to set the power switch [9] on the front panel to its
standby position (out). This will prevent you from
accidentally connecting a hot signal source to the
monitors and getting a rude surprise.

There are a number of other settings you can make
on the back of the HR624 MK2, and you can look at the
graphic instructions relating to each of them on the
back of the cabinet (or wait until you read about them
later on in this manual so you really know what they
do). For now, just leave them at the factory default
settings (ACOUSTIC SPACE = WHOLE; LOW FREQ =
49Hz; HIGH FREQ = 0), except for the POWER MODE
[6] switch. Be sure it is set to the STANDBY position.

ON HR624 MK2 BASS RESPONSE
AND YOUR CONTROL ROOM.

Your new HR624 MK2s achieve their
best bass response in a room that’s
optimized for bass reproduction. A
lot of factors can conspire to thwart

the HR624 MK2s’ extended low
frequency — including room shape, room volume and
acoustical treatment.

This is not a cop-out or an apology. It’s plain old
physics in action. Luckily we’ve armed you with some
compensating controls that you can use to optimize the
frequency response of the speakers in your particular
room. Consider the following:

The ACOUSTIC SPACE switch
must be set correctly.

When you put your HR624 MK2s in a corner or up
against walls, their bass characteristics change. Adjust
the ACOUSTIC SPACE [3] switch setting accordingly to
avoid muddy or exaggerated low frequency response.

5

Owner’s Manual

Owner’s Manual

ACOUST IC SP ACE

0dB

–

2

dB

–

3dB

–

4

dB

20 100Hz

LOW FR EQ

LOW CUT

80Hz

HIGH FREQ

0dB

–

2dB

10kHz

+

2

dB

ACOUSTI C SPACE A PPLICATI ONS

SPEAKERS AGAINS T WALLSPEAKERS I N CORNERS

CONSOLE

CONSOLE

HALF SPAC E

QUARTER S PACE

49Hz

SPEAKERS A WAY

FROM WALLS

CONSOLE

WHOLE SPA CE

0dB

INPUT

SENSITIV ITY

–

10dB

NORMALOFF

ACOUSTIC

SPACE

LOW

FREQ FIL TER

POWER

MODE

0

(NORMAL )

AUTO

ON

–2dB

+

2dB

STANDBY

ON

HIGH

FREQ FIL TER

HALF

WHOLE (NOR MAL)

QUARTER

80Hz

LOW CUT

49Hz

(NORMAL )

B

AC

MAINS INPU T

SIGNA L INP UTS BAL/U NBAL

XLRPHONE RCA

CBA

RISK OF ELE CTRIC SHOCK

DO NOT OPEN

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

AVIS:

RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR

120

BOTTOM OF CABINET

Set the Voltage Selector
Switch to “120” for 120 VAC
mains, and to “240” for
220-240 VAC mains.

6

HR624 MK2

HR624 MK2

Feel free to experiment.

Placement

In many respects, every room is unique in terms of its

acoustics.

Even after you’ve read about how to set the HR624
MK2’s rear panel switches, try other settings to see if
your particular room environment requires different
adjustments.

And, even after you’ve placed your monitors where you
think they’ll sound best, try moving them around. You
might be pleasantly surprised.

Finally, keep an open mind about
improving your room’s acoustics
and bass-handling ability.

Nobody likes to buy a new set of monitor speakers
and then be told that they should spend extra bucks on
bass traps or a remodeling job. But the simple fact is,
“standard” rooms, i.e., rectangular rooms in
conventional business or residential structures, are
rarely if ever conducive to optimal low bass
reproduction without some modications.

The HR624 MK2s were designed to be placed in a
vertical position. If you nd it necessary to place the
speakers in a horizontal position (on their sides), place
them so that the woofers are toward the inside; that is,
so the woofers are closest to each other. This provides
the best low-frequency summing and overall imaging.

The HR624 MK2s may also be wall-mounted using
the mounting hardware located on the bottom of the
cabinet. These are currently designed to be used with
the OmniMount 60.0 WB (Wall-to-Bottom) wall-mount
bracket, which provides a wide range of horizontal and
vertical movement to meet your coverage requirements.
However, many companies change specications
without notice. Please refer to the OmniMount website
and contact their team for more details:

www.omnimount.com/pro

When the monitor is operated at high sound pressure
levels, a fair bit of heat can be generated by the internal
power ampliers. These internal ampliers are part of
the rear panel electronics assembly. To ensure adequate
ventilation, the rear of the monitor should be placed at
least three inches away from the wall.

Luckily, there are plenty of options short of building
a new control room, many of which are covered in this
manual.

Additional Tidbits of Wisdom

• When you shut down your equipment, turn off the

HR624 MK2 studio monitors rst to prevent thumps
and other noises generated by any upstream equipment
from coming out the speakers. When powering up, turn
on the monitors last.

• Save the shipping box! You may need it someday, and

you don’t want to have to pay for another one.

• Save your sales receipt in a safe place.

• Also record all HR624 MK2 serial numbers in the space

provided on the next page, along with where and when
you bought them.

Note: The Mackie logo can be rotated 90º so
that it is oriented correctly when placing the
speakers on their sides. Gently pull out on
the Mackie emblem, rotate it, and push it
back into place.

7

Owner’s Manual

Owner’s Manual

A Few Words About THX™ pm3™
Certication

Contents

Nearly two decades ago, George Lucas turned a
passion for great sound into the world’s most accepted
and trusted solution for achieving it. The standard was
named THX (for Tomlinson Holman, who developed
the THX Sound System when he was the research and
technical director at Lucaslm Ltd.™ in the early 80s),
and today, with hundreds of thousands of home theater
customers and more than 3000 THX Certied movie
theaters enjoying its benets, the THX name has
become nothing short of legendary. Simply put: when
it comes to premium sound, no other name so closely
denes ‘quality’ for millions of movie-goers and home
theater enthusiasts alike.

Today, a new landscape is emerging. A landscape
comprised of hundreds of small, professional multi­channel facilities, whose need for differentiation, expert
technical and marketing support, and a true, multi­channel standard is becoming a competitive fact of life.
Again, THX has a singular solution and this time it’s
called THX pm3 Certication.

All facilities involved with mixing and/or monitoring
of multi-channel material should have the option to use
pm3. THX pm3 Certication is ideal for DVD mastering,
sweetening, and mixing; and is also perfect for facilities
doing work in broadcast, music, or multi-media
applications.

IMPORTANT SAFETY INSTRUCTIONS ...........2

INTRODUCTION.................................................. 3

QUICK START ........................................................................... 4

REAR PANEL DESCRIPTION ..............................8

1. SIGNAL INPUTS................................................................ 8

2. INPUT SENSITIVITY ........................................................ 8

3. ACOUSTIC SPACE.............................................................8

4. LOW FREQ FILTER ........................................................... 9

5. HIGH FREQ FILTER .......................................................... 9

6. POWER MODE................................................................10

7. Mains Input .....................................................................10

8. Passive Radiator .............................................................11

FRONT PANEL DESCRIPTION ..........................12

9. Power Switch .................................................................. 12

10. Power Ring and Overload Indicator ......................12

PROTECTION CIRCUITS ....................................12

Overload Protect .............................................................. 12

Thermal Protect ................................................................. 13

Integrated Magnetic Shielding ...................................... 13

Input Signal Wiring ...........................................................13

HR624 MK2 THX pm3 Certication

When we submitted the HR624 MK2s for THX pm3
Certication, they passed on the rst try with no
modications!

Anyone seeking THX Certication for their studio,
or striving to maintain THX standards, can use the
HR624 MK2s and rest assured that their facility is in
full compliance.

• Please write the serial number for your studio monitor here
(all studio monitors if you have more than one) for future reference
(i.e., insurance claims, tech support, return authorization, etc.):

Monitor 1 Monitor 2

Purchased at:___________________________________ Date of Purchase:_____________

CARE AND CLEANING .......................................13

SERVICE INFO ......................................................14

Troubleshooting.................................................................14

Repair .................................................................................... 15

TECHNICAL INFORMATION ........................... 16

HR624 MK2 Specications..................................................16

Graphs ................................................................................... 17

HR624 MK2 Block Diagram .............................................18

Monitor 3

Part No. SW0592 Rev. F 01/11
©2007-2011 LOUD Technologies Inc. All Rights Reserved.

8

HR624 MK2

HR624 MK2

REAR PANEL DESCRIPTION

INPUT

SENSITIVITY

–

10dB

NORMALOFF

ACOUSTIC

SPACE

LOW

FREQ FILTER

POWER

MODE

0

(NORMAL)

AUTO

ON

–2dB

+

2dB

STANDBY

ON

HIGH

FREQ FILTER

HALF

WHOLE (NORMAL)

QUARTER

80Hz

LOW CUT

49Hz

(NORMAL)

B

A C

ACOUSTIC

SPACE

LOW

FREQ FILTER

POWER

MODE

0

(NORMAL)

AUTO

ON

–2dB

+

2dB

STANDBY

ON

HIGH

FREQ FILTER

HALF

WHOLE (NORMAL)

QUARTER

80Hz

LOW CUT

49Hz

(NORMAL)

B

A C

This is where you connect your signal to the monitor,
and make adjustments to the frequency response of
the speakers to match the monitor’s location and your
room’s environment.

For THX applications, the rear panel
switches and controls should be set
to the THX positions as indicated in
this section.

1. SIGNAL INPUTS

The location of the signal input jacks makes the
connectors exit down and not straight out the back of
the enclosure. This ush-mount design allows you to
place the monitor right up against the wall if desired.

• The XLR female, TRS female (balanced), and RCA

female (unbalanced) input connectors are provided for
user convenience.

• Don’t connect more than one source to the jacks.

• Unbalanced TS (tip-sleeve) lines can be accommodated

via the TRS jack. Make sure the cable terminates with
a TS plug (like a guitar plug), or if it’s a TRS plug (such
as a headphone plug), make sure the ring is tied to the
sleeve and that the plug is fully inserted into the jack.

• The XLR and TRS input connectors accept balanced or

unbalanced signals. The connectors are wired as follows
(per the AES/IEC standard):

XLR TRS RCA

2. INPUT SENSITIVITY

THX = NORMAL

The HR624 MK2 expects a line-level signal at its input

connectors.

• The reference sensitivity is –7.5 dBu=100 dB SPL at
one meter (39 inches) with the INPUT SENSITIVITY
control set to its NORMAL position (in other words,
wide open).

• The HR624 MK2 is designed to operate with a +4 dBu
signal when the INPUT SENSITIVITY control is in the
NORMAL position.

• Refer to the QUICK START section on page 4 for the
level-setting procedure.

3. ACOUSTIC SPACE

Hot (+) Pin 2 Tip Tip
Cold (–) Pin 3 Ring —
Shield (Ground) Pin 1 Shield Shield

• The HR624 MK2s can be used with a home receiver
even if the receiver lacks a preamp output by using a
speaker-level to line-level signal attenuator. (See page
13 for more information.)

THX = WHOLE (NORMAL)

This is a three-way switch that adjusts the low-frequency
response of the monitors to compensate for their
placement in the room. See page 5 for an overview of
the rear panel.

• If you place the HR624 MK2 monitors against a wall

(half space [3B]), set the ACOUSTIC SPACE switch
to the “B” position. This activates a shelving lter to
reduce the low-frequency output by 2 dB to compensate
for the half-space placement.

• If you place the monitors into the corners of your

room (quarter space [3A]), the low-frequency output
approximately doubles from what it is in half space.
Set the ACOUSTIC SPACE switch to the “A” position to
reduce the low-frequency output by 4 dB to compensate
for the quarter-space placement.

• If you use the HR624 MK2s free-standing, away from

walls and corners (whole space [3C]), set the
ACOUSTIC SPACE switch to the “C” position
(NORMAL).

9

Owner’s Manual

Owner’s Manual

POWER

MODE

0

(NORMAL)

AUTO

ON

+

2dB

STANDBY

ON

HIGH

FREQ FILTER

4. LOW FREQ FILTER

LOW

FREQ FILTER

POWER

MODE

0

(NORMAL)

AUTO

ON

–2dB

+

2dB

STANDBY

ON

HIGH

FREQ FILTER

80Hz

LOW CUT

49Hz

(NORMAL)

ACOUSTIC S PACE

0

dB

–

2

dB

–

3dB

–

4

dB

20 100Hz

LOW FREQ

LOW CUT

80Hz

HIGH FREQ

0dB

–

2dB

10kHz

+

2dB

ACOUSTIC SPACE APPLICATIONS

SPEAKERS AGAINST WALLSPEAKERS IN CORNERS

CONSOLE

CONSOLE

HALF SPACE

QUARTER SPACE

49Hz

SPEAKERS AWAY

FROM WALLS

CONSOLE

WHOLE SPACE

0

dB

INPUT

SENSITIVITY

–

10dB

NORMALOFF

ACOUSTIC

SPACE

LOW

FREQ FILTER

POWER

MODE

0

(NORMAL)

AUTO

ON

–

2dB

+

2dB

STANDBY

ON

HIGH

FREQ FILTER

HALF

WHOLE (NORMAL)

QUARTER

80Hz

LOW CUT

49Hz

(NORMAL)

B

AC

MAINS INPU T

SIGNAL INP UTS BAL/UNBAL

XLRPHONE RCA

CBA

RISK OF ELECTRIC SHOCK

DO NOT OPEN

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

AVIS:

RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR

Removing the low-frequency content also allows
you to raise the overall output level somewhat. Low­frequency information requires the largest amount of
an amplier’s output, so restricting the low-frequency
content allows raising the mid-frequency level
somewhat. If your client insists on mixing LOUD, this
may be a workable strategy.

THX = 80Hz

The LOW FREQ FILTER switch inserts a

low-frequency rolloff into the response curve.

• For some applications, the low-frequency output of
the HR624 MK2 may impair your ability to make mix
judgements.

• For THX applications, use the 80Hz setting.

• For non-THX applications where a sub-woofer isn’t
enhancing low-frequency output use the 49Hz
(NORMAL) position.

• The LOW FREQ switch affects the low-frequency
content of your mix. Remember how things work in
reverse, so removing the deep bass content on playback
may actually increase it in the nal mix.

• You can use the LOW FREQ switch’s 80Hz position to
simulate a smaller loudspeaker, especially one with
limited low-frequency capability (like a certain popular
2-way neareld monitor). You may need to do this if a
small speaker is the eventual destination of your mix,
or perhaps just to see how your mix sounds on a clock
radio.

5. HIGH FREQ FILTER

THX = 0 dB

The HIGH FREQ FILTER switch tailors the overall
high-frequency response by ±2 dB beginning at 10kHz.
Leave this switch in the 0 (NORMAL) position unless:

• You want to subtly brighten or darken the sound of the

speakers.

• Perhaps you have hearing loss caused by too many

nights in front of a double Marshall stack.

• You just like to mix on the bright side or dull side.

If your mixes consistently sound dull or dark when
you listen elsewhere, this usually indicates that your
monitors are too bright, relative to your normal hearing.
A bit less high-frequency energy usually xes this, and
you can force the mix in this direction by reducing the
high-frequency output of the monitors by using the –2 dB
position of the switch.

10

HR624 MK2

HR624 MK2

Conversely, if your mixes are consistently too bright,

POWER

MODE

AUTO

ON

STANDBY

ON

ACOUS TIC SPA CE

0dB

–

2dB

–

3

dB

–

4

dB

20 100Hz

LOW F REQ

LOW CUT

80Hz

HIGH FREQ

0

dB

–

2dB

10kHz

+

2

dB

ACOUST IC SPA CE AP PLICAT IONS

SPEAKER S AG AINS T WAL LSPEAKERS IN CO RNERS

CONSOL E

CONSOL E

HALF SPA CE

QUARTER SPACE

49Hz

SPEAKERS AWAY

FROM WALLS

CONSOLE

WHOLE SP ACE

0

dB

INPUT

SENSITI VITY

–

10dB

NORMALOFF

ACOUSTI C

SPACE

LOW

FREQ FI LTER

POWER

MODE

0

(NORMA L)

AUTO

ON

–2dB

+

2dB

STANDBY

ON

HIGH

FREQ FI LTER

HALF

WHOLE (N ORMAL)

QUARTER

80Hz

LOW CU T

49Hz

(NORMA L)

B

AC

MAIN S I NPU T

SIGN AL INP UTS B AL/ UNB AL

XLRPHON E RCA

CBA

RISK OF EL ECTRIC SHOCK

DO NOT OPE N

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

AVIS:

RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR

then adding some additional high-frequency energy in
the monitors satises your ears, and the resultant mix
has less HF content.

The timbre of your monitors affects
the way that your mixes play on other
equipment. Remember that the
monitors have a mirroring effect on

the mix; if the monitors make
something too loud in the mix it usually results in not
enough of that thing on tape.

Start with the response modication switches in the
factory recommended settings (see Quick Start
Section). After prolonged listening, if you notice a trend
in your mixes, perhaps making some small adjustments
as suggested here will help.

It’s a real rush to mix really loud. But remember that
the resulting mix only sounds good when you play it at
least that loud. However strange it may sound, mixes
made at lower levels sound even better when played
loud; perhaps even a bit bigger than life.

Get that sound level meter out. Decide what level
you’re going to mix at and use the meter to help keep
your mixing at that level. Your ears will thank you, and
your mixes will be better for it.

6. POWER MODE

This 3-position switch turns the ampliers on or off, or
sets them to automatic mode. Use this switch to set the
HR624 MK2s to your preferred mode of operation, and

switch for convenience.

use the front panel power

• In the STANDBY position, the power ampliers are in

Standby mode and produce no sound. Low-level circuitry
is still active, but the power consumption of the
circuitry is minimal (12 watts).

• Flip the switch to the ON position and the power

ampliers are live and operate normally. (The front
panel power [9] switch must also be IN.)

• When it’s in the AUTO ON position, the ampliers turn

on and off depending on the presence or absence of an
input signal. An input signal level of –74 dBu
(minimum) activates the auto-on function. A silent
period greater than eight minutes activates the
auto-off function. The power ring [10] on the front
panel reects the state of the ampliers.

[9]

11

Owner’s Manual

Owner’s Manual

7. Mains Input

Tweeter

Woofer

Passive Radiator

Connect the power cord to this IEC socket, and plug

the other end into your AC outlet.

• When the POWER MODE [6] switch is in the ON
position (and the front panel power switch [9] is in the
IN position), applying AC power activates the muting
circuit for about four seconds while the power supply
and internal circuitry stabilize, then the HR624 MK2
unmutes and is ready to go.

• Simple ports or ducts must have sufcient surface
area to prevent the velocity of the air within them from
exceeding 5% of the speed of sound, which keeps the
vent from becoming audible (breathing and wheezing
sounds) at high signal levels.

• This requirement for sufcient surface area creates a
design problem when using ports — nding enough
space in the enclosure for them to t.

The passive radiator replaces the port found on most
speaker systems. It offers several advantages to simple
porting:

8. Passive Radiator

When you mount a loudspeaker in a box, there are two
things that you can do with the radiation from the rear of
the cone: use it to enhance the low-frequency performance
of the speaker system (bass reex system) or soak it up
(acoustic suspension system).

• A bass reex system uses the rear radiation to extend

the low-frequency response. Most systems provide holes
(ports) in the front or back of the cabinet to release the
rear wave. Sometimes the holes have tubes (ducts) in
them. The dimensions of the holes and the volume of
the cabinet work with the characteristics of the woofer
to produce low-frequency extension. These systems are
characterized by good low-frequency performance down
to the –3 dB frequency set by the design. Below this
frequency, the frequency response falls at 24 dB/octave
or more.

The HR624 MK2 is a bass reex 6th-order system.
Rather than use ports, the vent takes the form of a
passive radiator, a mass-loaded at piston coupled to
the air trapped within the enclosure. You can’t see the
passive radiator because it is located at the rear of the
cabinet, behind the power amplier assembly.

• One primary advantage of a passive radiator is that it
can reproduce low frequencies with lower distortion
and at a higher sound pressure level (SPL) than a
simple port or duct.

• Our unique passive radiator design uses a at
diaphragm providing exceptional stiffness to the
radiating surface.

• The elliptical shape of the passive radiator takes up
nearly the entire surface area available on the rear of
the enclosure, allowing the passive radiator to move
more air than a port.

12

HR624 MK2

HR624 MK2

FRONT PANEL DESCRIPTION

POWER

MODE

AUTO

ON

STANDBY

ON

9. Power Switch

Use this switch to turn on or off the HR624 MK2 from
the front. It works with the POWER MODE [6] switch
on the rear panel in the following way:

• If the POWER MODE switch on the rear panel is set

to STANDBY, the front panel power [9] switch has no
effect. The power [10] ring remains off.

• If the POWER MODE switch is ON, the front panel

power switch turns the HR624 MK2 on or returns it to
STANDBY mode, as indicated by the power ring.

• If the POWER MODE switch is in the AUTO ON

position, the front panel power switch turns the HR624
MK2 on, even when there is no signal present. If there is
no signal after about two minutes, the auto-off function
is activated and the ampliers go into Standby mode,
indicated when the power ring goes off.

10. Power Ring and Overload Indicator

The power ring around the power switch illuminates
when the power ampliers are on, and turns off when
the ampliers are in Standby mode or off.

The power ring turns red when the overload
protection circuit has been triggered.

• Occasional blinking of the overload indicator means

that the loudest transients are reaching the maximum
drive capability of the ampliers. This is okay, although
distortion may be audible.

• Frequent or continuous blinking of the overload

indicator means that you have exceeded the maximum
drive allowed for the speakers. The ampliers are
clipping, and the overload protection circuit has taken
over, reducing the input level. You should reduce the
level from your signal source until the overload
indicator blinks occasionally or not at all.

PROTECTION CIRCUITS

There are a number of protection mechanisms
designed into the HR624 MK2 to safeguard the
loudspeakers from inadvertent damage.

CAUTION: The protection circuits are designed to
prevent damage to the loudspeakers under reasonable
and sensible conditions. Should you choose to ignore
the warning signs (i.e., frequent overload indications,
excessive distortion), you can still damage the speakers
in the HR624 MK2 by overdriving them. Such damage is
beyond the scope of the warranty.

Overload Protect

• If you see the overload indicator [10] blinking more
than just occasionally, it’s an indication that you should
reduce the signal level coming from your mixer or other
signal source.

• The blinking overload indicator means the driver
thermal overload protection has activated a compressor.
This reduces the input level to the ampliers.

• The compressor was designed to protect the speakers
and its action is highly audible.

If a client insists on listening to the
monitors at a very high volume, you
may nd that the overload indicator
lights frequently. Since the majority of

the power requirement in any monitor
are the low frequencies, selectively reducing the low
end can provide a little more headroom and volume
for the monitors. Change the LOW FREQ FILTER [4]
switch to 80Hz if necessary, to reduce the bass response.
This may allow the HR624 MK2s to play just enough
louder to satisfy the client and to eliminate most of the
amplier clipping.

13

Owner’s Manual

Owner’s Manual

Thermal Protect

All ampliers produce heat. The HR624 MK2 is

designed to be efcient both electrically and thermally.

• If for some reason the heatsinks get too hot, a thermal
switch activates, placing the HR624 MK2 into Standby
mode (indicated when the power ring [10] turns off).

• Should this happen, make sure that airow to the rear
of the cabinet is not restricted.

• When the heatsinks cool down to a safe temperature,
the switch resets and normal operation resumes.

Integrated Magnetic Shielding

The HR624 MK2 Studio Monitor contains drivers
with large magnet structures. The drivers’ magnets are
shielded to help prevent the magnetic eld from
radiating out into the environment and playing havoc
with computer monitors or TV screens. Unshielded
speakers can cause distortion in both the shape and
color of the picture if placed too close to a CRT
(cathode ray tube). If you have a particularly sensitive
computer monitor or TV screen, it may be necessary to
move the speakers a few inches away.

CARE AND CLEANING

Remove the protective plastic lm that encases the

cabinet.

Note: You may leave the protective
plastic lm on the cabinet if you
wish, or you can remove all but the
side that will be in contact with the

surface it is sitting on to protect the
nish. Also, you should save the protective plastic lm
to reapply to the cabinet in case you need to move it to
another location (or return for servicing).

The piano-black nish on the HR624 MK2 cabinets is
exceedingly beautiful, yet extremely delicate. Clean the
outside of the cabinet with an optical grade non-scratch
cloth, such as you would use to clean eyeglasses, CDs, or
DVDs.

Input Signal Wiring

You should use high-quality, shielded cable to connect
the signal source to the SIGNAL INPUT jack [1] on the
HR624 MK2.

• Foil shielded cables, such as Belden 8451, 8761, or 9501

are commonly used for studio wiring.

• Microphone cables work well.

• The better the shield, the better the immunity from

externally induced noise (like EMI and RFI). Route the
cable away from AC power cords and outlets. These are
common sources for hum in an audio signal. Wall warts
and line lumps are especially insidious hum inducers!

You can purchase quality cables from your Mackie

dealer.

• In certain home theater applications, it may be

necessary to connect the speaker outputs from a stereo
receiver to the inputs of the HR624 MK2s, if the receiver
doesn’t have preamp outputs or other line-level output
connections.

CAUTION: Do not attempt to
connect a speaker output directly
to the input of the HR624 MK2!
Speaker levels are much higher than
line levels and can damage the input
circuitry in the HR624 MK2.

You can, however, insert a speaker-level to line-level
signal attenuator between the receiver’s speaker output
and the HR624 MK2’s input. Your Mackie dealer may be
able to help you nd one, or you can build your own.

14

HR624 MK2

HR624 MK2

SERVICE INFO

If you think your Mackie product has a problem,
please check out the following troubleshooting tips and
do your best to conrm the problem. Visit the Support
section of our website (www.mackie.com/support)
where you will nd lots of useful information such as
FAQs, and documentation. You may nd the answer
to the problem without having to send your Mackie
product away.

Troubleshooting

No Power

Bad Sound

• Is the input connector plugged completely into the

1

jack? If using a
plugged all the way in.

• Is it loud and distorted? Reduce the signal level at the
mixer.

• If possible, listen to the signal source with headphones
plugged into the preamp stage. If it sounds bad there,
it’s not the monitor.

• Too much bass or not enough bass? Move around the
room and see if the bass response changes. It’s possible
your listening position coincides with a room mode
where the low frequencies either become exaggerated
or nulled. If so, try moving the monitors to a different
position, or moving your listening position.

⁄4" TS or TRS plug, make sure it is

• Our favorite question: Is it plugged in?

• Make sure the power cord is securely seated in the IEC
socket [7] and plugged all the way into the AC outlet.

• Make sure the AC outlet is live (check with a tester or
lamp).

• Is the power [9] switch on the front panel pushed in
and the POWER MODE [6] switch on the rear panel in
the ON position?

• Is the power ring [10] on the front panel illuminated?
If not, make sure the AC outlet is live. If so, refer to “No
Sound” below.

• If the power ring is not illuminated, and you are certain
that the AC outlet is live, it will be necessary to have
the HR624 MK2 serviced. There are no user-serviceable
parts inside. Refer to “Repair” at the end of this section
to nd out how to proceed.

No Sound

• Is the power ring [10] on the front panel illuminated? If
not, refer to “No Power” above.

• Is the INPUT SENSITIVITY [2] control turned up?

• Is the signal source turned up? Make sure the signal level
from the mixing console (or whatever device
immediately precedes the studio monitor) is high
enough to produce sound.

• If it’s a stereo pair, try switching them around. For
example, if a left output is presumed dead, switch the
left and right cords at the monitor end. If the problem
switches sides, it’s not the monitor. It could be a bad
cable, or no signal from the mixer.

Noise/Hum/Buzz

• Check the signal cable between the mixer and the
monitor. Make sure all connections are secure. These
problems usually produce crackling noises, hum, or
buzz.

• If connecting an unbalanced output to the HR624 MK2
balanced input, make sure the shield is connected to the
unbalanced ground of the source and to pins 1 and 3 of
the XLR (or the sleeve and ring of the TRS jack).

• If a CATV cable is connected to the system, try
disconnecting it. If the hum goes away, call your cable
carrier to check for proper grounding of the cable.

• Make sure the signal cable is not routed near AC cables,
power transformers, or other EMI sources (including
wall warts and line lumps!). These sources usually
produce hum.

• Is there a light dimmer or other triac-based device on
the same AC circuit as the monitor? Dimmers cause
buzzing noises. Use an AC line lter or plug the monitor
into a different AC circuit.

• Excessive hiss is an indication of an incorrect gain
setting somewhere before the speaker.

• If possible, listen to the signal source with headphones
plugged in. If it sounds noisy there, it’s not the monitor.

I hear sound from the monitors after I switch
the AC power off!

• Use the front panel switch to turn the monitors on and
off, or turn off the signal going to the monitors when the
AC power is turned off.

15

Owner’s Manual

Owner’s Manual

Repair

For warranty service, please refer to the warranty

information on page 19.

Non-warranty service for Mackie products is
available at a factory-authorized service center. To
locate your nearest service center, visit
www.mackie.com, click “Support” and select “Locate
a Service Center.”

If you do not have access to our website, please call
our Tech Support department at 1-800-898-3211 (normal
business hours, Pacic Time), to explain the problem.
They will tell you where the nearest factory­service center is located in your area.

Service for Mackie products living outside the United
States can be obtained through local dealers or
distributors.

authorized

Need help with your new HR624 MK2?

• Visitwww.mackie.comandclickSupporttond:  
 FAQs,manuals,andaddendums.

• Emailusat:[e-mail].

• Telephone1-800-898-3211tospeakwithoneofoursplendid
 technicalsupportrepresentatives(normalbusinesshours,PST).

16

HR624 MK2

HR624 MK2

TECHNICAL INFORMATION

HR624MK2Specications

Enclosure

Materials and Construction:

3

⁄4-inch (19 mm) thick MDF cabinet construction with internal

bracing to add to cabinet stiffness.

Piano-black gloss finish.

Die-cast aluminum exponential wave guide for controlled, wide
dispersion from high-frequency driver and Zero Edge Baffle™ to
minimize diffraction around the cabinet edges.

Open cell adiabatic “foam fill” acoustical damping material
absorbs internal reflections, preventing delayed sound
coloration.

Flush-mount connector system allows monitor to be placed
against a wall without need for connector clearance.

Transducers

Low-frequency driver:
Diameter: 6.7 inches (170mm)
Sensitivity (2.83V, 1 m): 89 dB SPL
Nominal Impedance: 4 Ω
Voice Coil Diameter: 1.25 inches (32mm)
Power Handling (Long Term/Program):
50/150 watts
Frequency Range: 45 Hz to 6 kHz
Frame: Die-cast magnesium
Magnet: Ferrite
Fully shielded: Ferrite opposing magnet

High-frequency driver:
Sensitivity (2.83V, 1m): 91 dB SPL

Nominal Impedance: 6 Ω
Power Handling (Long Term/Program):
20/50 watts
Frequency Range: 1.6 kHz to 22 kHz
Diaphragm/Suspension: Titanium with polymer suspension
Voice Coil Diameter: 1.0 inch (25.4mm)
Magnet: Neodymium
Bucking Magnet: Ferrite opposing magnet

Passive Radiator:
6-inch x 9-inch (152mm x 228mm) mass-loaded elliptical flat
piston with variable thickness filleted edge rubber surround.

Crossover Section

Crossover Type:
Modified Linkwitz-Riley, 24 dB/octave @ 3 kHz

Amplier Section

Low-frequency power amplifier
Rated Power (at 1 kHz with 1% THD):
100 watts
Rated Load Impedance: 4 ohms
Rated THD (1W to –1 dB of rated power):

0.1 %
Slew Rate: 15V/µS
Distortion (THD, SMPTE IMD, DIM 100):
< 0.035%
Signal-to-Noise
(20Hz-20kHz, unweighted, referenced to 100W into 4Ω):
> 101 dB
Cooling: Convection
Design: Monolithic IC, Class AB,
Parametric Servo Feedback

High-frequency power amplifier
Rated Power(at 1 kHz with 1% THD):
40 watts
Rated Load Impedance: 6 ohms
Rated THD (1W to –1 dB of rated power):

0.1 %
Slew Rate: 15V/µS
Distortion (THD, SMPTE IMD, DIM 100):
< 0.035%
Signal-to-Noise
(20 Hz-20 kHz, unweighted, referenced to 40 W into 8Ω):
> 93 dB
Cooling: Convection
Design: Monolithic IC,
Conventional Class AB

System Specications

Input Type: Balanced Differential
(XLR and 1/4" TRS)
Unbalanced (RCA)
Input Impedance: 20 kΩ Balanced
10 kΩ Unbalanced
Input Protection: RFI and Level Protected
Maximum Input Level: +20 dBu
Low Frequency Filter: 80 Hz, 2nd Order, Butterworth
HF Equalization: Shelving ±2 dB @ 10 kHz
Acoustic Space:
A position: –4 dB @ 50 Hz, shelving
B position: –2 dB @ 50 Hz, shelving
C position: Flat
Compressor:
Independent high and low frequency overload detection
Enclosure Alignment: 6th Order
Over Excursion Prevention: 2nd Order High-Pass Filter
Low Line Voltage Shut Down:
Thermal Protection: Amplifier Shut-Down, Auto Reset
Muting: 5 seconds at turn-on
Signal Sense Threshold: –74 dBu (0.155 mV)
Driver Protection: Independent LF and HF Detection
Overall Compression

60% of Nominal Line

17

Owner’s Manual

Owner’s Manual

Acoustic Section

-10

+10

-9

-8

-7

-6

-5

-4

-3

-2

-1

-0

+1

+2

+3

+4

+5

+6

+7

+8

+9

20 20k50 100 200 500 1k 2k 5k 10k

Hz

HR624 Acoustic Space Filter Res ponse

dBu

-10

+10

-9

-8

-7

-6

-5

-4

-3

-2

-1

-0

+1

+2

+3

+4

+5

+6

+7

+8

+9

20 20 k50 1 00 200 500 1 k 2 k 5k 10k

Hz

HR624 High Frequency EQ Filter Response

dBu

-40

+10

-38

-36

-34

-32

-30

-28

-26

-24

-22

-20

-18

-16

-14

-12

-10

-8

-6

-4

-2

-0

+2

+4

+6

+8

20 20 k50 1 00 200 500 1 k 2 k 5k 10k

Hz

HR624 Low Frequenc y Filter Response

dBu

10.3" (26.2 cm)

12.6" (31.9 cm)

13.1"

(33.3 cm)

HR624 MK2

WEIGHT

23.4 lb

(10.6 kg)

8.6" (21.9 cm)

Free-Field Frequency Response:
±1.5 dB, 49 Hz to 20 kHz

Lower cutoff frequency: –3 dB @ 45 Hz

Upper cutoff frequency: –3 dB @ 22 kHz

Sound Pressure Level at 1 meter,
–7.5 dBu into balanced input: 100 dB SPL @ 1m

Maximum peak SPL per pair: 115 dB SPL @ 1m

Maximum short term SPL on axis,
half space 80 Hz to 2.5 kHz: 106 dB SPL @ 1m

Residual noise (maximum gain, 600Ω source,
20 Hz-20 kHz bandwidth): < 8 dB SPL @ 1m

Rated Line Input Voltage and Power:

Power consumption:
Standby mode: 12 watts
Quiescent (idle): 20 watts
Musical Program, Loud mix: 105 watts
Both channels driven into
resistive loading to 1% clipping
(LF 86W/4Ω, HF 38W/8Ω): 255 watts

US: 120 VAC, 60 Hz
Europe: 240 VAC, 50 Hz
Korea (AC Power Selector at 240 V):
220 VAC, 60 Hz
Japan (AC Power Selector at 120 V):
100 V, 50-60 Hz
Rated Power
(For UL-6500, CSA-E65-94, EN-60065):
130 watts

Graphs

Physical Properties

Height: 13.1 in/33.3 cm
Width: 8.6 in/21.9 cm
Depth Enclosure: 10.3 in/26.2 cm
Depth Overall: 12.6 in/31.9 cm
Internal Volume: 0.29 cubic feet (8.2 liters)
Weight: 23.4 lb/10.6 kg

LOUD Technologies is always striving to improve our products
by incorporating new and improved materials, components and
manufacturing methods. Therefore, we reserve the right to change
these specifications at any time without notice.

18

HR624 MK2

HR624 MK2

+2 dB

0

2

3

1

–2 dB

HIGH FREQ.

HF TRANSDUCER

THERMAL MODELER

BALANCED

LINE

INPUTS

UNBALANCED

LINE

INPUT

SENSITIVITY

COMPRESSOR

CROSSOVER

HI-FREQ

WHOLE

HALF

QUARTER

ACOUSTIC

SPACE

LO-FREQ

SENSITIVE

CALLOUS

HF OUT

LF TRANSDUCER

THERMAL MODELER

LF OUT

HI-FREQUENCY

POWER AMPLIFIER

HI-FREQUENCY

DRIVER

LO-FREQUENCY

DRIVER

TWEET

HF OUT

LF OUT

MUTE

49Hz (NORMAL)

80Hz

LOW FREQ

LO-FREQUENCY

POWER AMPLIFIER

MUTE

SENSE

RESISTOR

BASS CONTROL SERVO LOOP

MOTION DETECTOR

WOOF

+

–

HI VDC

+

–

LO VDC

TOROIDAL POWER

TRANSFORMER

FUSE

V

ref

ON

AU TO

STANDBY

+15VDC

SIGNAL
SENSE

MUTE

ON/OFF

CONTROL

MUTE

THERMAL

SWITCH

LOW AC

VOLTS SENSE

POWER SWITCH
(FRONT PANEL)

POWER

MODE

SWITCH

HIGH = MUTE OFF
LOW = MUTE ON

MACKIE
HR624 MK2
BLOCK DIAGRAM
(030507)

OUTER SPACE

120V ↔ 240V

FUSE

POWER RING
(POWER = WHITE
OVERLOAD = RED)

HR624 MK2 Block Diagram

The following are trademarks or registered
trademarks of LOUD Technologies Inc.: The Mackie logo,
HR Series, Zero Edge Bafe, and the Running Man.

THX and pm3 are trademarks of THX Ltd. which may
be registered in some jurisdictions. All rights reserved.

Lucaslm is a trademark of Lucaslm Ltd.

This manual also contains names and marks of other
companies which belong to those respective companies,
and are hereby acknowledged.

HR624 MK2 design protected under the following
patent: DES. 387,351

©2007-2011 LOUD Technologies Inc. All Rights Reserved.

19

Owner’s Manual

Owner’s Manual

MackieLimitedWarranty

Please keep your sales receipt in a safe place.

This Limited Product Warranty (“Product Warranty”) is provided by LOUD Technologies Inc. (“LOUD”)
and is applicable to products purchased in the United States or Canada through a LOUD-authorized
reseller or dealer. The Product Warranty will not extend to anyone other than the original purchaser of
the product (hereinafter, “Customer,” “you” or “your”).

For products purchased outside the U.S. or Canada, please visit www.mackie.com/warranty to find
contact information for your local distributor, and information on any warranty coverage provided by the
distributor in your local market.

LOUD warrants to Customer that the product will be free from defects in materials and workmanship
under normal use during the Warranty Period. If the product fails to conform to the warranty then LOUD
or its authorized service representative will at its option, either repair or replace any such nonconforming
product, provided that Customer gives notice of the noncompliance within the Warranty Period to the
Company at: www.mackie.com/support or by calling LOUD technical support at 1.800.898.3211 (toll­free in the U.S. and Canada) during normal business hours Pacific Time, excluding weekends or LOUD
holidays. Please retain the original dated sales receipt as evidence of the date of purchase. You will need it
to obtain any warranty service.

For full terms and conditions, as well as the specific duration of the Warranty for this product, please visit
www.mackie.com/warranty.

The Product Warranty, together with your invoice or receipt, and the terms and conditions located
at www.mackie.com/warranty constitutes the entire agreement, and supersedes any and all prior
agreements between LOUD and Customer related to the subject matter hereof. No amendment,
modification or waiver of any of the provisions of this Product Warranty will be valid unless set forth in a
written instrument signed by the party to be bound thereby.

16220 Wood-Red Road NE • Woodinville, WA 98072 • USA
United States and Canada: 800.898.3211
Europe, Asia, Central and South America: 425.487.4333
Middle East and Africa: 31.20.654.4000
Fax: [phone] • www.mackie.com
E-mail: [e-mail]