AudioControl HPX Owner's Enjoyment Manual

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22410 70th Ave West • Mountlake Terrace, WA 98043 • Phone [phone] • Fax [phone] • www.audiocontrol.com

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Owner’s Enjoyment Manual

In-Dash Processor and Crossover

HPX

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Owner’s Enjoyment Manual

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Table Of Contents

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Features and Highlights. . . . . . . . . . . . . . . . . . . . . . . . . . . 3

A Guided Tour of the HPX . . . . . . . . . . . . . . . . . . . . . . . . 5

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Placement and Mounting . . . . . . . . . . . . . . . . . . . . 8

Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Audio Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Level Matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Adjusting the High Definition Expansion . . . . .

(HDE). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Setting the Crossover Points . . . . . . . . . . . . . . . . . 14

Changing the Display Lens . . . . . . . . . . . . . . . . . . 15

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Introduction

Congratulations on your purchase of the

AudioControl HPX, the world’s first in-dash processor/
crossover with High Definition Expansion (HDE), a special
circuit to increase the perceptual size on any audio system.
This makes the HPX an ideal product for any system that uses
compression technology or perceptual coding software, like
MP3 or MiniDisc. The HDE circuit is also a great answer for
cars with less than ideal speaker locations (which pretty much
means . . . ALL OF THEM). Combined with an
audiophile-quality 24 dB/octave crossover and a high voltage
line driver, the rainforest dwellers of AudioControl have
created an ultimate “one box” solution in the HPX.

What can you expect Big sound! What more could

you ask for? The HDE circuit within the HPX helps
increase the size of any performance autosound

system. The dynamics of the bass, midbass,

midrange, and high frequencies are all enhanced

thanks to the HDE circuit, providing a sonic

experience like no other. Now that we have

your curiosity tingling, it is time to sit

back, pour yourself a cold one and peruse

through this Owners Enjoyment Manual

for the HPX in-dash processor/crossover.

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Features of the HPX:

• High Definition Expansion (HDE)

• 24 dB/Octave Linkwitz Riley crossover

• Pre-amp gain of 20 dB

• Line driver: 13 volts peak output

• Balanced differential inputs

• Subwoofer level control

• Signal-sensing display

• High headroom PWM switching power supply

• Switchable backlighting (amber/green)

• Master volume and fader control

• Selectable ground isolation

• Optimum-voltage LED

• Speaker-level inputs

• Stereo

1

⁄8" jack input

QUICK INSTALLATION INFO

For those of you who are short on time and high on
confidence (or caffeine, for that matter), refer to pages 8-12
(Figures 6-10). As a matter of reference, the HPX is shipped in
the following configuration:

Shipped Option Page #

Illumination Green Amber 7

Inputs Balanced Unbalanced 6

Ground

isolation Isolated 200 ohm or Ground 7

Input Gain Unity 0 to +20 dB 6

Crossover Engaged Disengaged 7

Crossover

frequency 90 Hz 30 Hz - 3500 Hz 7

It is important to know that we recommend that you allow
your authorized AudioControl dealer to install your HPX. If
he or she installs your HPX, we will warranty your HPX for an
unbelievable 5 years parts and labor. Should you opt to install
the HPX on your own, we will warranty it for 1 year.

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FEATURES AND HIGHLIGHTS

The following section will tell you about all of the nifty
features of your HPX. Knowing these features will help you
maximize the performance of your HPX in-dash processor/
crossover. It will also make you the envy of all of your fellow
autosound dudes and dudettes.

High Definition Expansion (HDE): The HDE
circuit is the heart and soul of the HPX in-dash processor/
crossover. Whether you are using music recorded using
perceptual coding, some form of compression technology
like MP3 or MiniDisc, or just have less than desirable speaker
locations, the HDE circuit will truly enhance the size of your
performance autosound system.

Portable Audio Input: The HPX provides a conve­niently located stereo

1

⁄8" jack on the faceplate to allow you

to easily plug in an MP3 player, Discman, or other portable
audio player. How convenient!!

Signal-sensing Display: The stylish blue and red
display senses the enhancements created by the HDE circuit
and turns them into an awesome light show. What’s even

better is the fact that you can customize the lens pattern that
the lights display through. What’s sound without the light?

24dB/Octave Linkwitz Riley Crossover: What is

the benefit of fine tuning your system if you cannot accu­rately route the proper frequencies to the proper amplifier
channels? The programmable audiophile-caliber crossover in
the HPX is the same crossover in many other award winning
AudioControl components and is a far cry from the wimpy
crossovers that find their way into many amplifiers these days.

Pre-Amp Line Driver: Talk about your ironies. Ampli-

fiers require a high voltage input signal (generally 2 to 5 volts)
to operate with maximum dynamic range and the best signal­to-noise ratio. On the other hand, typical source units only
put out 1 to 2 volts, if you’re lucky. In a system where the
source unit is located in the front of the car and the
amplifier(s) are located in the rear, the length of the connect­ing cables can have an negative impact on the strength of the
signal.

The HPX includes a line driver that takes the weak output
voltage of a head unit and increases it 20 dB (up to 13 volts
peak) and then delivers it downstream to the amplifier inputs.

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Balanced Inputs: The HPX uses a balanced-differential

input circuit that helps cancel any noise that radiates into
the signal path between the source unit and
your HPX.

Speaker-level Inputs: If you are like most people and

like the look and features of your factory-installed source
unit, but feel it’s lacking on the performance side, good news.
The HPX has speaker-level inputs that will interface with
most factory-installed source units (even Bose) and let you
add amplifiers and speakers to your heart’s content.

Subwoofer Level Control: Need a little more bass to

impress your buddies? Or maybe you want to tone it down
to not scare off your date. Whatever the case, the HPX has a
subwoofer output level control that allows you to balance
the amount of signal that goes to your subwoofer outputs.

Master Volume: The HPX has a big ol’ hunking master

volume KNOB (no annoying up and down switches for us) to

control the signal output to the amplifiers. Raise the volume
level on your source unit to its maximum setting (or just
before clipping) and you will never need to touch them again.

Fader Control: The HPX has a fader control to allow
for easy balancing between the front and rear speakers.

The Most Important Feature Of All: Reliability.
That’s right, your AudioControl HPX comes with a full 5-year
parts and labor warranty when it is installed by an autho­rized United States AudioControl dealer. These seasoned
pros have the training and the equipment to take care of the
job quickly and not leave your dashboard looking like Swiss
cheese. Keep in mind that if you or your friends who “have
an awesome set of tools” choose to install it, your HPX still
has a 1 year parts and labor warranty.

To activate your warranty, you need to FILL OUT AND
SEND IN YOUR WARRANTY CARD! Also, save your invoice
or sales slip as proof of purchase. Not only
are these necessary for warranty
purposes, they are also
important if the unforeseen
disappearance of your HPX
should happen while you are socializing at the
local espresso and salmon bar. Insurance companies
have very little imagination.

Figure 1: Balanced Inputs

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A GUIDED TOUR OF THE HPX

1. Volume: Because the HPX is a pre-amp unit, it serves

as the main control unit in the audio system. It has a master
volume control that controls the output to all of your
amplifiers. You can crank up the volume control of your
source and deliver maximum signal to noise and voltage to
the HPX, then use the HPX as your daily volume control.

2. Fader: When amplifier channels are connected to

the front and rear outputs, the fader control will allow you
to fade the signal level back and forth. This also means you
can have front and rear fading even though your source unit
only has 2-channel outputs.

3. Subwoofer Level Control: Exactly what it says it

is. Controls the amount of signal that goes out to the sub­woofer output of your HPX.

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Figure 2: Front View of HPX

4. Expansion: This knob controls the amount of HDE

(High Definition Expansion). A little twist will awaken any
system whereas a 360 degree whirl can make the sound of
your system expand beyond the pillars of the windshield.

5. Signal Sensing Display: The signal sensing display

is connected to the HDE such that it flashes with the music
when the circuit is engaged. The lens on the display is
something we thought looked cool, but if it is not to your
fancy, don’t worry. You have the ability to create your own
pattern and replace ours. See page 15 for more information.

6. Portable Audio Input: This input accepts an 1⁄8"

stereo audio signal, most commonly found on portable
audio devices like MP3 players and DiscMan. To utilize this
input, you must engage the “Source” input switch.

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8. Output Jacks: Next to the inputs are the outputs

which should be connected to the front, rear and subwoofer
amplifiers, if applicable. Note: Depending upon your system
application, you have the ability to have the highpass
outputs play full range by changing the CROSSOVER
jumpers under the chassis top.

9. Inputs: The HPX has 2 sets of inputs, MAIN and

SPEAKER LEVEL. These inputs should get their signals from
the main source unit/head unit and should attach to either
RCA jacks or speaker leads that are coming out of your source
unit.

10. Balanced Input Selector: Located under the

cover and behind the input connectors are jumpers that
allow you to utilize or bypass the balanced input circuitry.
Although it is shipped in the balanced mode, which is best, it
may be necessary to change this depending upon the
configuration of the components you use. To change this,
move the appropriate jumper on the 3-pin header.

11. Input Gain Control: These potentiometers (AKA

“pots”) are used to increase the amount of signal voltage to
your power amplifiers. With these controls, you can provide

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Figure 3: Top View of HPX

7. Power Connections: This nifty connector is a god-

send to anyone who has tried to wire up their gear with their
head crammed under the dash. You can wire up the power,
ground, remote turn-on, and illumination from the conve­nience of the driver’s seat and then casually plug it in the
back of your HPX.

7 8 9

11

10

12

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up to 13 volts (peak) to your amplifier’s inputs. Check with
your amplifier manufacturer to determine exactly how
much voltage they can really handle. More info on this in
the section on “Level Matching”, page 13.

12. Crossover Frequency Selection: Under the top

cover of your HPX lies a plug-in module that controls the
crossover functions. This module selects the frequency that
the front and rear outputs of your HPX will play down to as
well as determining where your sub-woofer will begin playing.
Shipped from the factory, the crossover is set at 90 Hz.

13. Crossover Bypass: To crossover or not crossover. . .

that is the question. With the HPX, it does not matter what
your answer is because we give you the ability to do both.
Changing these jumpers allow you to run the HPX front and
rear outputs in either full-range or high-pass mode depend­ing upon your system requirements.

14. Illumination Selection: These jumpers let you

change the backlight illumination to green or amber. Given
our devotion to protect the rainforest, we have shipped the
HPX in the green mode.

15. Ground Isolation Selector: This feature allows

you to change the power, supply ground for different
systems. When the HPX is shipped from the factory, the
selector is in the fully isolated position (which is generally
the best.) Alas, not every manufacturer (or installer) devotes
much time into getting their grounds right. Therefore, we
have provided other ground isolation options to help if you
have a ground loop noise (alternator whine) in your system.
Experiment with different settings if you run into this type
of problem. To change the settings, make sure you turn the
system off, carefully move the black jumper from the center
two pins (Isolated) and move it to either the top two pins
(200 ohms) or the bottom two pins (ground).

At this point, you have to ask yourself, “Do I feel lucky. . .
or do I know what the heck I am doing?” If the answer is
“No”, then you need to drive to your nearest authorized
AudioControl dealer before you get in over your head. Make
the right choice while you can!

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INSTALLING YOUR HPX IN-DASH
PROCESSOR/CROSSOVER

Having absorbed everything in the manual up to this
point, then you probably know we endorse having an
authorized AudioControl dealer installer your HPX as it
would be in your best interest. Above and beyond having all
of the appropriate technical know-how and experience, they
have lots of cool tools.

If you are still with us and are feeling confident, than read on. . .

A. Placement and Mounting the HPX

Placement: By definition, the HPX in-dash proces-

sor/crossover was designed to be installed on or near the
dashboard of most cars. However, if you are a building a real
trick system, like with a separate audio system in the front
and a separate one in the rear of a vehicle, the HPX is an ideal
pre-amp control that can mounted in the front and/or the
rear of the vehicle.

Mounting: The HPX is flexible enough to mount

almost anywhere, although somewhere on the dash or in a
center console is the most logical. You will want to be able to

Figure 4: HPXwith mounting brackets

access it while you are sitting in the driver’s seat of your
vehicle. The HPX is designed to be mounted almost anywhere
in a vehicle, although it is recommended to avoid hot spots
like the firewall, engine compartment, or tail pipe. The
mounting location must also be safe from water seepage or
areas with bad seals (rubber gaskets, not sleek furry mammals
who eat salmon). If there are old (or new) water stains, stay
away.

We have provided brackets to assist you in mounting the
HPX chassis under the dashboard or glovebox. The screw holes
on the HPX chassis also allow for easy installation underneath
a radio or with a dash kit. It is of utmost importance to mount
the HPX securely to avoid any undue stress or breakage from
over acceleration or braking.

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Figure 5: Rear View of the HPX

B. HPX Power Wiring

• ENLIGHTENING INFO • Disconnect the negative

terminal of your car’s battery before working on any electri­cal connections. Failure to do so could lead to a dramatic
spark in your life.

Remote Turn-On: Connect a 22 to 18 gauge wire from

the head-unit’s remote turn-on to the “Remote” connector
on the HPX.

Positive (+12 V) Connection: Insert an 18 gauge or

larger wire into the connector labeled “Power” on the nifty
connector of your HPX. Connect it to a good, fused (1
ampere), constant source of 12 volts (we suggest the battery.)

Ground Connection: Use the same gauge wire as you
did for the positive connector, and run it from the “Ground”
connector on the HPX to the negative terminal of the
battery, a ground buss, or a verified ground location. The
factory head unit ground is NOT recommended.

Illumination: The connector labeled “Illumination”
on your HPX controls the backlighting of your unit. If you
run a wire from this connector to a switched 12-volt source,
such as the “Remote” turn on wire on your source unit, you
light up the backlighting on the HPX. A really cool idea is to
connect the illumination wire to a factory dash light
dimmer and you now have the ability to dim the backlight­ing of the HPX with your dash lights.

Remote

Power Ground

Illumination

Power Connector

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Front, rear and subwoofer amplifier

Figure 6: HPX with source unit and three amplifiers

C. HPX Audio Wiring

Planning: As you may already have guessed, there are

numerous ways to configure the HPX in your audio system.
Spend a little quality time planning out your system and
even sketching it out on paper if you can. The following
diagrams are just a few of the possibilities.

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Four channel and subwoofer amplifiers

Figure 7: HPX with source unit, 4 channel amp and sub amplifier Figure 8: HPX with MP3 player, 4 channel and subwoofer amplifiers

Using portable audio source unit

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Figure 10: HPX with source, front amp, and sub amp

Simple 2-way systemUsing a factory-installed source unit

Figure 9: HPX using speaker level inputs, 4 channel amp and sub amplifier

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D. Level Matching

Many manufacturers claim that their source units
produce signal voltages in the area of 2 to 4 volts. However,
what they neglect to mention is that you only achieve these
incredible voltage levels when the volume is turned all the
way up. Try listening to that all of the time. By following
the level matching steps for the HPX you will be able to take
full advantage of the high-voltage output of your head unit.

Step #1. Disconnect the RCA cables leading into your
amplifiers, and make sure the only RCA cables between your
head unit and the HPX’s main inputs are attached. Turn the
volume level knob on the HPX to maximum.

Step #2. Play a favorite tape or compact disc that
contains consistent, dynamic music and turn the source
unit’s volume control up to its maximum level (NOTE: Some
source units may produce distortion or “clipping” when their
volume controls are turned all of the way up. If this happens,
you will hear distortion even at low levels when you connect
the rest of the system. If this is the case, lower the source
unit’s volume level until you no longer hear distortion.) The
volume control on the HPX will now be the master volume
control.

Step #3. Using a small screwdriver, adjust the “Input
Gain” control on the top of the HPX until the yellow

“Overload” LED starts to flicker with
the music.

Step #4. Turn off the entire system

and attach the output RCAs from the
HPX to the next component in line.

Step #5. Turn down the gain control

on your amplifiers to the least sensitive
setting (turning the gain control counter
clockwise.) This will allow you to drive a
hotter signal in to your amplifiers. For
more info on this, download Tech Note
1006 from our Web page
www.audiocontrol.com.

• Important Tip •

If the OVERLOAD light does not come on because of the low
output of the source unit, turn the Input Gain to maximum.
Please refer to the manufacturers specifications on input voltage
to determine whether you will need to decrease the “Input Gain”
on the HPX to avoid clipping the next component in line. If the
next component in line is an AudioControl component, there is
no need to re-adjust the “Input Gains”, because they can handle

the hot signal voltage the HPX produces.

Figure 11: Input Gain Controls

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E. Adjusting The High Definition Expansion
(HDE) Circuitry

The “Expansion” knob controls the intensity or mix rate
of the HDE circuit, which is conveniently located on the
front of your HPX. By turning this knob clockwise it will
increase the amount of the HDE that is mixed into the
signals running inside the HPX. Turning it counterclockwise
will minimize the effect. . . but you probably already guessed
that. The actual setting of the HDE circuit is dependent on
several things; the type of software you are using (compact
disc, tape, MP3, etc.) and the location of the speakers in your
system. However, what will really matter is what you like
the best as there are no autosound police that will kick in
your door and haul you away if you set it improperly.

Starting with the knob turned completely counterclock­wise, start playing some music that you normally listen to
and gradually increase the HDE circuit. What you should
experience is the sound starting to rise and then expand
outside your dash. The dynamics of bass, midrange, and
high should also increase dramatically. At some point, you
may encounter the effect becoming somewhat overpower­ing, which means you should decrease the HDE slightly.
Now take a listen for a minute or so and then turn off the
HDE effect by pushing in the button labeled “HDE”. Pretty
amazing, eh!! Now rush out and tell three of your friends
that they need an HPX for their cars.

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H. Changing The Display Lens:

The artistic geniuses of AudioControl have chosen the
design of the display lens on your HPX, however, that does
not mean that you have to like it. In fact, you can customize
your HPX display by creating your own lens on a piece of
translucent paper and installing it by following these steps

1. Carefully remove the three no. 4 screws on the rear and

remove the metal cover.

2. Remove the one top 4-40 screw that holds in the

display bracket and carefully remove the bracket.

3. Replace the existing graphics with your “custom” graphics.

Figure 12 shows the size your graphics will need to be.

4. Line up the clear lens over the new graphics, hold against

the bracket, and reinstall in chassis using the 4-40 screw.

5. Replace the top cover and no. 4 screws.

F. Crossover Modules: Additional crossover modules

for HPX are available from your authorized AudioControl
dealer, or you can create custom modules by using the
following formula:

7,200

Frequency (Hz)

Example:

For a 2,500 Hz module - 7,200/2,500 = 2.88K ohms

The 24 dB crossover module requires eight resistors of this value.

Note: Use

1

⁄4 watt carbon or metal film resistors of a 5%

tolerance or better.

G. Bypassing The Crossover: Depending upon your

system configuration, you may wish to not high-pass your
front and rear speakers and instead let them play full range.
Fortunately, the engineering gods at AudioControl have
thought of everything and given you the ability to bypass
the crossover. Just remove the chassis top and move the
CROSSOVER jumper from “Engage” to “Bypass” and
voilá - full-range front and rear outputs plus you get to keep
your lowpassed subwoofer output.

Figure 12: Display size

= Resistor Value In Kilohms

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I. Troubleshooting

No sound 1. Check “Power” and remote turn on

for proper voltage. (Is power light on?)

2. Center the fader control.

3. Turn up “Input Gain”“ control.

4. Check ground connections.

5. Is the “Source” button in the wrong
position?

6. Turn up the “Volume”.

Hiss 1. Turn down amp gains.

2. Turn down amp gains.

3. Turn down amp gains.

4. Adjust source unit output.

Distorting 1. Lower volume level of source unit or
speakers portable audio unit.

2. Adjust gain levels of HPX using
“Maximized” LED .

Whine 1. Check impedance of source grounds

to amplifier grounds for
resistance differences.

2. Change isolation selection of ground­ing jumpers. See page 7, #15

No HDE 1. Check polarity on speakers and
effect amplifiers.

2. Make sure source material is stereo.

3. Push in the “HDE” button

No display 1. Push in “Display ” button.

2. Check source unit output.

If You Like The HPX, You’ll Love...

The EQL Concert
Series is our award winning
dual-bandwidth, trunk
mount equalizer. Thirteen
octave and half octave
spaced bands help tame even
the most wicked acoustical
environment, your car.

The Epicenter Concert Series is our patented (U.S. Patent

#4,698,842) bass restoration component, that puts the “woof”

back into any woofer. You
have to hear it to believe it.

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HPX

Owner’s Enjoyment Manual

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And now a word from the legal department. . .

The WARRANTY

People are scared of warranties. Lots of fine print.
Months of waiting around and leaving messages in some
stranger’s voice mail Well, fear no more, this warranty is
designed to make you rave about us to your friends. It’s a
warranty that looks out for you and helps you resist the
temptation to have your friend, “...who’s good with electron­ics”, try to repair your AudioControl product. So go ahead,
read this warranty, then take a few days to enjoy your new
HPX before sending in the warranty card and comments.

“Conditional” doesn’t mean anything ominous. The
Federal Trade Commission tells all manufacturers to use the
term to indicate that certain conditions have to be met
before they’ll honor the warranty. If you meet all of these
conditions, we will warranty all materials and workmanship
on the HPX for one year from the date you bought it (five
years if it is installed by an authorized United States Audio­Control dealer) We will fix or replace it, at our option, during
that time.

Here are the conditional conditions:

1. You have to fill out the warranty card and send it to us

within 15 days after purchasing the HPX.

2. You must keep your sales receipt for proof of purchase

showing when and from whom the unit was bought. We’re

not the only ones who require this, so it’s a good habit to get
into with any major purchase.

3. Your HPX must have originally been purchased from an
authorized AudioControl dealer. You do not have to be the
original owner, but you do need a copy of the original sales
slip.

4. You cannot let anybody who isn’t: (A) the AudioCon­trol factory or (B) somebody authorized in writing by
AudioControl to service your HPX. If anyone other than (A)
or (B) messes with your HPX, that voids your warranty.

5. The warranty is also void if the serial number is altered
or removed, or if the HPX has been used improperly. Now
that sounds like a big loophole, but here is all we mean by it.

Unwarranted abuse is: (A) physical damage (don’t use the
HPX for a car jack); (B) improper connections (120 volts into
the power jack can fry the poor thing); (C) sadistic things.
This is the best mobile product we know how to build, but if
you mount it to the front bumper of your car, something
will go wrong.

6. If an authorized United States AudioControl dealer

installs the HPX, the warranty is five years.

Assuming you conform to 1 through 6, and it really isn’t
all that hard to do, we get the option of fixing your old unit
or replacing it with a new one.

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Owner’s Enjoyment Manual

Legalese Section

This is the only warranty given by AudioControl.
This warranty gives you specific legal rights that vary from
state to state. Promises of how well your HPX will perform
are not implied by this warranty. Other than what we have
covered in this warranty, we have no obligation, express or
implied. Also, we will not be obligated for direct or indirect
consequential damage to your system caused by hooking up
the AudioControl HPX.

Failure to send in a properly completed warranty card

negates any service claims.

HPX SPECIFICATIONS

All specifications are measured at 14.4 V DC (standard
automotive voltage) As technology advances, AudioControl
reserves the right to continuously change our specifications,
like our weather.

Maximum input/output level . . . . . . . . . . . . . 9.5 Vrms/13 V peak

Frequency response . . . . . . . . . . . . . . . . . . . . . 20 Hz-100k Hz; ±1 dB

Total harmonic distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.005%

Signal to Noise ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -110 dB

Input Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20K ohms

Output Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 ohms

Input gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0- 20 dB

Crossover slope . . . . . . . . . . . . . . . . . . 24 dB/octave Linkwitz Riley

Factory crossover setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90Hz

Power supply . . . . . . . . . . . . . . . High headroom PWM switching

Power draw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA

Recommended fuse rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Amp

Illumination Color . . . . . . . . . . . . . . . . switchable green or amber

Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1" H x 6.75" W x 5" D

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 lbs

AudioControl, Making Good Stereo Sound Better, Performance Match, HPX,

HDE, The Epicenter, EQL, EQX, FOUR.1,HPX, THREE.1, FOUR.1 and Para-BASS are

all trademarks of Electronic Engineering and Manufacturing, Inc.

This manual was composed, drafted, and transcribed on a damp, grey, and
blustery rain-drenched day at our home in the Pacific Northwest Rainforest.
The coffee was hot.

© 2000 AudioControl, a division of Electronic Engineering and Manufacturing, Inc. All rights reserved

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