Genelec HT312B, HT315B Operating Manual

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HT312B and HT315B

Operating Manual

Genelec HT312B and HT315B Active 3-Way Speaker Systems

System

The Genelec HT312B and HT315B are three-

way active home theater loudspeaker sys-

tems including drivers, multiple power ampli-

fiers and active crossovers. The systems

are designed for room volumes up to 175

m3 / 6200 ft3 (HT312B) or 250 m3 / 8800 ft3

(HT315B) with maximum listening distances

up to 6.1 - 7.6 meters (20-25 ft). They are

designed to perform well both as free-stand-

ing or ﬂush mounted into the wall structure.

The unique Directivity Control Waveguide™

(DCW™) Technology developed by Genelec

provides stable and extremely accurate imag-

ing and frequency balance even in difficult

acoustic environments.

louds peakers, each system conta ins an

individually matched ampliﬁer unit with mul-

tiple power ampliﬁers, active crossover ﬁlters

and protection circuitry.

tion ampliﬁers are capable of driving a stereo

system to peak output levels in excess of 124

dB SPL at 2 m (HT315B) or 123 dB SPL at 2 m

(HT312B) with music material. Versatile cross-

over controls allow for precise matching of the

loudspeakers to different acoustic conditions.

Designed as active

The fast, low distor-

Drivers and

cabinet construction

On the HT315B the low frequencies are

reproduced by an 385 mm (15”) bass driver

loaded with a 110 liter vented box. The

-3 dB point is 33 Hz and the low frequency

response extends down to 29 Hz (-6 dB). The

HT312B features a 305 mm (12”) bass driver

in a 65 liter vented box with the -3 dB point at

35 Hz and -6 dB at 32 Hz.

Both models share the same midrange and

high frequency driver layout with a proprietary

130 mm (5”) direct radiating cone for the MF

and a 25 mm (1”) metal dome for the HF loaded

by proprietary Directivity Control Waveguide.

All drivers are magnetically shielded.

Amplifiers

The ampliﬁers, crossover ﬁlters and power

supply of the HT312B and HT315B are inte-

grated into a 19” 3U RAM4/5 rack module.

The bass, midrange and treble ampliﬁers

of the RAM4 ampliﬁer powering the HT312B

produce 180 W, 120 W and 120 W of short

term power. Respectively, the RAM5 ampli-

ﬁer provided with the the HT315B produces

400 W, 120 W and 120 W. The ampliﬁers are

designed to operate at very low THD and

IM distortion values and incorporate special

circuitry for driver overload protection and

ampliﬁer thermal protection.

Neutrik Speakon connectors are included

to facilitate wiring and system connection at

customer facilities. Each ampliﬁer is factory

calibrated with the individual loudspeaker

they are shipped with in order to eliminate the

effects of component tolerances and ensuring

consistent quality and long term reliability.

Crossover filters

The active crossover network consists of

three parallel bandpass ﬁlters. The crosso-

ver frequencies are 410 Hz and 3.0 kHz on

the HT315B and 420 Hz and 3.2 kHz on the

HT312B. Bass, midrange and treble Level

controls with 1 dB steps are included in the

crossover to obtain uniform frequency bal-

ance in different acoustic conditions. The low

frequency Tilt and Roll-Off controls both have

four 2 dB steps to allow reﬁned low frequency

response tailoring. The crossover network is

driven by an active balanced input stage, fed

by a 3 pin XLR connector. Variable input sen-

sitivity allows for accurate level matching to

the signal source output.

Installation

Each loudspeaker is supplied with an ampli-

fier unit, a mains cable, Neutrik Speakon

connectors and an operating manual. Once

unpacke d place t he loudspeaker in its

required listening position, taking note of the

line of the acoustical axis (see Figure 1).

Sufficient cooling for the RAM4/5 ampli-

fier must be ensured. The cooling fan on

the amplifier back panel draws air through

the ﬁlter on the left side panel and blows the

warmed air to the space behind the ampliﬁer.

The airﬂow must not be obstructed. Note also

that the space behind the ampliﬁer must either

be ventilated or sufﬁciently large to dissipate

heat so that the ambient temperature does not

rise above 35 degrees Celsius (95°F).

Before connecting up, ensure that the

mains switch is off (see Figure 2). Check that

the mains voltage selector is correctly set to

your local voltage.

Connections

Each system is delivered with two 8-pole

and two 4-pole Speakon cable connectors

for constructing signal cables of desired

length.

Measure the required lengths of 8-pole

and 4-pole cable and secure the connec-

tors on them pin to pin. See Table 1 below for

recommended cable thicknesses. The whole

cable should have an outside diameter of 8 to

20 mm (5/16" to 13/16") to ﬁt in the Speakon

connector.

Alternatively, pre-terminated lengths of

cable are available from Genelec.

Be sure not to mix the ampliﬁer/loudspeaker

pairs when installing multiple loudspeakers

at the same time. Each ampliﬁer and loud-

speaker delivered together are marked with

the same identiﬁcation number and calibrated

together for optimal performance.

Audio input is made via a 10 kOhm bal-

anced XLR connector, but unbalanced leads

may be used as long as pin 3 is grounded to

pin 1 of the XLR. Once connection has been

made, the loudspeakers are ready to be pow-

ered-up.

Access to the

front panel controls

The decorative front panel of the ampliﬁer

is held in place by guide pins and two mag-

nets. To remove the panel, pull it straight

out.

Setting the input sensitivity

Adjustment of the input sensitivity of each

loudspeaker can be made to match the

output of the decoder or other signal source

by use of the input sensitivity control on the

amplﬁer front panel. A small screwdriver is

needed for the adjustment. The manufacturer

default setting for this control is -6 dBu (fully

clockwise) which gives an SPL of 100 dB

Cable gauge Max. length

2,0 mm2 (14 AWG) 30 m (100 ft)

3,3 mm2 (12 AWG) 40 m (130 ft)

5,3 mm2 (10 AWG) 60 m (200 ft)

Table 1. Recommended cabl e thicknesses for different leng ths of cable

Loudspeaker mounting position

Free anechoic response None None None None None

Free standing in a damped room

Free standing in a reverberant room

In a corner -2 dB -2 dB -2 dB None None

Flush mounted None None -4 dB None None

Table 2. Suggested t one control settings for differe nt acoustic environmen ts

H1 mm (in) W1 mm (in) H2 mm (in) W2 mm (in)

HT312B 540 (21 1/4") 200 (7 7/8") 230 (9 1/16") 170 (6 11/16")

HT315B 650 (25 5/8") 240 (9 1/2") 282 (11 1/8") 202 (7 15/16")

Figure 1. Locat ion of the acoustic axis

Bass

roll-off

None -2 dB None None None

None -2 dB -2 dB None None

Bass

tilt

Bass

level

Midrange

level

Treble

level

Figure 2. RAM4 amplifier connectors and controls. RAM5 is similar except that it has no voltage selector.

@1m with -6 dBu input level. To get the full

output level of 120 dB SPL from the HT315B

an input level of +14 dBu is needed at this

setting. Respectively, the full output level of

the HT312B is reached at an input level of

+10 dBu.

Autostart and remote control

Th e RAM 4 an d RAM 5 ampli fie rs ar e

equipped with an “Autostart” function, which

automatically turns the ampliﬁer to “standby”

mode if an input signal has not been detected

for approximately thir ty minutes, and back

to “on” mode when the signal returns. The

function can be deactivated by turning the

“AUTOSTART” dip switch on the amplifier

back panel to “OFF”.

The ampliﬁer power can also be switched

by a remote control unit connected to the

respective inputs on the ampliﬁer back panel.

Two pairs of connectors are provided, 1 and 2

for a 12 V DC type remote control, and 3 and

4 for an external switch or relay type control.

Do not connect two remote controls to the

loudspeaker at the same time. Activate the

function by turning the "REMOTE CONTROL"

dip switch on the ampliﬁer control panel to

"ON". Note that the remote control function

overrides the “autostart” dip switch function.

Setting the tone controls

The acoustic response of the system may

also have to be adjusted to match the acoustic

environment. The adjustment is done by set-

ting the ﬁve tone control switch groups ‘bass

tilt’, ‘bass roll-off’, ‘bass level’, ‘mid level’ and

‘treble level’ on the control panel of the ampli-

ﬁer. The manufacturer’s default settings for

these controls are ‘All Off’ to give a ﬂat ane-

choic response. See Table 2 for suggested

tone control settings in differing acoustic envi-

ronments. Figures 7 and 8 show the effect

of the controls on the anechoic response.

Always start adjustment by setting all switches

to the ‘OFF’ position. Then set only one switch

per group to the ‘ON’ position to select the

response cur ve required. If more than one

switch is set to ‘ON’ (within one switch group)

the attenuation value is no longer accurate.

Vertical / horizontal mounting

The loudspeakers are delivered either for

vertical or horizontal mounting. In the hori-

zontal mounting position the bass drivers

should point inwards to obtain better low

frequency coupling. If the loudspeaker posi-

tioning needs to be changed, the DCW plate

can be rotated so that the midrange driver

remains always located at the bottom of the

DCW. Remove the four corner screws of the

DCW and pull the plate carefully out without

stressing the wires and the gasket. Rotate

the plate 90 degrees in the appropriate direc-

tion and remount the screws.

Flush mounting

The HT312B and HT315B can be used ﬂush

mounted into the wall structure, which offers

some acoustical benefits. No cabinet edge

diffraction will occur, resulting in an improved

response, especially at midrange frequen-

cies. Low frequency reﬂections from the wall

behind the loudspeaker can be avoided, which

improves the low frequency response and efﬁ-

ciency and allows the loudspeaker to work in

half space conditions. In terms of installation

and orientation, the loudspeaker’s acoustical

axis (See Figure 1.) should also point directly

to the the reference listening position. The

loudspeakers should be vertically aimed so

that the acoustical axis of the loudspeakers

meet around ear height at the reference listen-

ing position. In the horizontal plane the loud-

speaker should be positioned according to the

standard stereophonic (60 degrees between

left-right channels) or multichannel (ITU-R

BS.775-1) placement recommendation.

Figure 3: Flush mounting the loudspe aker in a wall constr ucted of wood

Figure 4: Flush mounting the loudspe aker in a wall constr ucted of concrete

Figure 5: Flush mounting the loudspe aker in a wall constructed of a combination of materials.

The ceiling, side walls and especially the

rear wall should be acoustically absorbent at

low frequencies. The wall in which the loud-

speakers are mounted should have a high

acoustical mass to properly implement a low

frequency radiation condition into half space

and be angled so that the loudspeakers are

correctly aimed. However, the loudspeak-

ers should not be mounted too high as this

increases the required vertical tilt of the loud-

speaker (maximum tilt angle < 20 degrees)

and reduces the optimum listening area. Great

care should be taken over how the loudspeaker

is mounted into the wall. Note the following:

A space 50 to 100 mm (2 to 4”) wide can

be left around the loudspeaker. Cover the

space around the loudspeaker with a facing

panel that should be ﬁxed to the wall. Leave

a gap of about 5 to 10 mm (¼ to ½”) between

the loudspeaker and the panel. Fill this gap

with a soft rubber gasket to allow for possible

cabinet movement (see Figure 6).

Regardless of the type of front wall con-

struction the loudspeaker cabinet should be

mounted on vibration isolators, with a resonant

frequency between 2 to 8 Hz, to prevent vibra-

tions from being transmitted to the wall and

impairing the low frequency performance.

If a heavy wooden front wall construction

is used, the space around the cabinet should

be ﬁlled with absorbent mineral wool or foam

plastic. The wooden wall structure must be

heavily braced to achieve sufﬁciently high

mass and rigidity (see Figure 3).

In a solid wall (e.g. concrete) structure, the

space around the cabinet should be filled

with either absorbent mineral wool or sand

bags (see Figure 4).

The wall can also be constructed of a com-

bination of materials to achieve high acousti-

cal structural mass that will disable low fre-

quency sound propagation and provide high

LF sound isolation (see Figure 5). Acoustic

consultants will be able to provide details and

design these structures.

Ensure that the cabinet is flush with the

surface of the wall. Discontinuities in the loud-

speaker mounting wall will cause diffraction,

which leads to inferior frequency response

and imaging. So, if a decorative cloth frame

is used to cover the wall, make sure that the

edges adjacent to the loudspeaker are less

than 20 mm (3/4”) deep. The cloth must be very

thin Tricot or an acoustically transparent mate-

rial otherwise the high frequency response of

the system will be adversely affected. Genelec

approved cloth grilles are available.

Mode indicator LED

The loudspeaker is provided with a three-

colour indicator LED on the DCW™ panel.

When the LED is green, it indicates that the

loudspeaker is ready for use. Standby mode

is indicated by yellow colour. Ampliﬁer clipping

is indicated by a blinking red light and ther-

mal protection mode by a constant red light.

If clipping is indicated reduce the signal level

so that the LED stops blinking. If the red LED

stays on constantly, switch off the loudspeaker

and the audio source and let the ampliﬁer cool

down. Check that the ventilation around the

ampliﬁer is not blocked. There should be a

Figure 6: Covering the gap betwee n the wall and the loudspeaker cabinet.

clearance of more than 100 mm (4”) between

the ampliﬁer back panel and any solid surface

at the back. If the red light does not come off,

contact authorised Genelec service.

The LED can be deactivated if you ﬁnd it

disturbing in a darkened room by turning both

the "POWER LED" and "STANDBY LED"

switches on the ampliﬁer panel to "OFF".

Maintenance

The air ﬁlter on the left side of the RAM4/5

ampliﬁer must be cleaned every six months.

Remove the decorative front plate and pull

the ﬁlter out. Check the ﬁlter and replace it

with a new one if any damage or brittleness

can be found.If the ﬁlter is in a good condi-

tion, carefully clean it with compressed air.

No other serviceable parts are to be found

wit hin the loudspe aker enc losure or the

amplifier unit. Any maintenance or repair

should only be undertaken by qualiﬁed serv-

ice personnel.

Figure 7: The curves above show the effect of the ‘bass’, ‘mid ’ and ‘treble’ level con trols, and the ‘bass til t’ and ‘bass roll-off ’ controls on the free field response of the HT312B, measured a t 2 m.

Figure 8: The curves above show the effect of the ‘bass’, ‘mid ’ and ‘treble’ level con trols, and the ‘bass til t’ and ‘bass roll-off ’ controls on the free field response of the HT315B, measured a t 2 m.

Figure 9: The upper curve group shows the horizontal directivity character istics o f the HT312B in i ts verti cal configuration measured at 2 m. The lower cur ve is a 1/6 octave power response measurement, derived from 144 individual directivity measurements.

Safety considerations

Although the HT312B and HT315B loudspeak-

ers have been designed in accordance with

international safety standards, to ensure safe

operation and to maintain the instrument under

safe operating conditions, the warnings and

cautions listed overleaf must be observed:

producing sound pressure levels in

excess of 85 dB, which may cause

permanent hearing damage.

4. Free ﬂow of air around the ampliﬁer is

necessary to maintain sufﬁcient cooling.

Do not obstruct airﬂow around the

ampliﬁer.

5. To prevent ﬁre or electric shock, do not

1. Servicing and adjustment must only

be performed by qualiﬁed service

personnel. The ampliﬁer must not be

opened.

2. Do not use the loudspeakers with an

unearthed mains cable or unearthed

mains connection as this may lead to

personal injury.

3. These loudspeakers are capable of

expose the unit to water or moisture. Do

not place any objects ﬁlled with liquid,

such as vases on or near the

loudspeaker or the ampliﬁer.

6. Note that the ampliﬁer is not completely

disconnected from the AC mains

service unless the mains cable

is removed from the ampliﬁer or the

mains outlet.

Figure 10: The upper cur ve group shows the horizontal directivity character istics o f the HT315B in i ts verti cal configuration measured at 2 m. The lower cur ve is a 1/6 octave power response measurement, derived from 144 individual directivity measurements.

Guarantee

These products are supplied with two year

guarantee against manufacturing faults or

defects that might alter their performance.

Refer to supplier for full sales and guarantee

terms.

HT312B and HT315B Operating Manual

system specifications

Ht312B Ht315B

Lower cut-off frequ ency, -3 dB Upper cut-off fr equency, -3 dB Free ﬁeld frequency r esponse of system

Maximum shor t term sine wave acoustic output on axis in half spa ce, averaged from 100 Hz to 3 kHz

Maximum long ter m RMS acoustic output in same c onditions with IECweighted noise (l imited by driver unit protection circu it)

Maximum peak acou stic output per pair in half spa ce with music mater ial

Self generated no ise level in free ﬁeld @ 2 m on axis

Harmonic dist ortion at 95 d B SPL at 1 m on axis:

Drivers Bass Midrange Treble All drivers are m agnetically shielde d

Weight 33 kg (73 lb) 52 kg (114 lb)

Dimensions Height Width Depth

<35 Hz >22 kHz 37 Hz - 21 kHz ( ±2.5 dB)

@ 1 m >116 dB SP L @1 m >120 dB SPL

@ 1 m >107 dB SP L @ 1 m >116 dB SP L

@ 2 m >123 dB @ 2 m >124 dB

<15 dB (A weighte d)

freq. <100 Hz <1% freq. >100 Hz <0.5%

305 mm (12") con e 130 mm (5") cone 25 mm (1") metal dome

680 mm (26 3/4") 400 mm (15 3/4") 380 mm (14 15/16 ")

<33 Hz >20 kHz 35 Hz - 20 kHz ( ±2.5 dB)

freq. 50...100 Hz <1% freq. >100 Hz <0.5%

385 mm (15") con e 130 mm (5") cone 25 mm (1") metal dome

810 mm (31 7/8") 480 mm (18 7/8") 420 mm (16 9/16" )

cRossoveR section

Ht312B Ht315B

Input connector XLR female pin 1 gnd

Input impedance 10 kOhm

Input level for 100 dB SPL output @1 m

Input level for maximum shor t term output

Subsonic ﬁlter 18 dB/octave

Ultrasonic ﬁlter 12 dB/octave above 25 kHz

Crossover frequency Bass/Mid Mid/Treble

Crossover acoustical slopes 18 - 24 dB/octave 24 - 32 dB/octave

Crossover level control opera ting range in 1 dB ste ps Bass Mid Treble

Bass roll-off co ntrol in 2 dB steps from 0 to -8 dB @35 Hz from 0 to -8 dB @33 Hz

Bass tilt contro l in 2 dB steps from 0 to -8 dB @80 Hz

pin 2 + pin 3 -

variable from +6 to -6 dBu

variable from +22 t o +10 dBu for 116 dB SPL @1 m

below 35 Hz

420 Hz

3.2 kHz

from 0 to -6 dB from 0 to -6 dB from 0 to -6 dB

The 'CAL' positi on is with all tone controls set to 'o ff' and input sensit ivity control to ma ximum.

variable from +26 t o +14 dBu for 120 dB SPL @1 m

18 dB/octave below 33 Hz

410 Hz 3 kHz

amplifieR section

Ram4 (Ht312B) Ram5 (H t315B)

Bass ampliﬁer sh ort term ou tput power

Midrange ampliﬁer short term output power with an 8 Ohm load

Treble ampliﬁer short ter m output power with an 8 Ohm load

Slew rate 80 V/µs

Ampliﬁer system distortion at nominal output THD SMPTE-IM CCIF-IM DIM 100

Signal to Noise ratio, referred to full output Bass Midrange Treble

Mains voltage 10 0/200V or 115/230V

Voltage operating range nominal ±10%

Power consumption Idle Full output

Weight 12,3 kg (27 lb) 15 kg (33 lb)

Dimensions Height Width Depth

*Note that the c able connectors requi re additional >100 mm (4") space behin d the ampliﬁer

180 W (4 Ohm load) 400 W (8 Ohm load)

120 W

Long term out put power is limited by driver unit protection circuitr y.

<0.05 % <0.05 % <0.05 % <0.05 %

>100 dB >100 dB >100 dB

selectable

50 W 300 W

133 mm (5 1/4") (3 U) 483 mm (19") 350 mm (13 4/5") *

100, 120, 220 or 230 V ﬁxed according to r egion

60 W 500 W

EC Declaration of Conformity

This is to certify that the Genelec HT312B and HT315B Active 3-Way S peaker s con form to th e foll owing standards:

Safety : EN / IEC 60065:1998 6th Edition EMC: EN 55020 : 2002 + A1 : 2003 EN 55013: (2001) EN 61000-3-2 (2000) EN 61000-3-3 (1995)

The product herewith complies with the requirements of The Low Voltag e Dir ective 73/2 3/EEC, EMC Direc tive 8 9/336 / EEC and 93/68/EEC

Signed: Ilpo Mar tikai nen Position: Date: 12-May-20 08

Chairman of th e Boa rd

Genelec Docu ment D0067R001a Copyri ght Genelec Oy 5.2008. All data subject to chang e without prior noti ce

Inter national e nquiries:

Genele c, Olvitie 5

FIN-74 100, Iisal mi, Finlan d

Phone +358 17 83 881

Fax +358 17 812 267

Email genele c@genelec.com

In the U.S. please c ontact:

Genele c, Inc., 7 Tech Ci rcle

Natick, MA 01760 , USA

Phone +1 508 652 0900

Fax +1 508 652 0 909

Email genele c.usa@genelec.com

In Chi na please contact:

Beijin g Genelec Audio Co. Ltd.

Jianwa i SOHO, Tower 12, R oom 2306

39 Eas t 3rd Ring Road

Chaoyang District

Beijin g 100022, China

Phone +86 0 5869 7915, Fax +86 10 586 9 7914

www.genelec.com

In Sweden ple ase contact

Genelec Sveri ge

Ellipsvägen 10 B

P.O. Box 5521, S-1 41 05 Huddinge

Phone +46 8 449 5220

Fax +46 8 708 70 71

Email info@gen elec.com

Genelec HT312B, HT315B Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual