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Genelec HT312A and HT315A Active Home Theater Systems
System
The Genelec HT312A and HT315A are
three-way active home theater loudspeaker
systems including drivers, multiple power
amplifiers and active crossovers. The sys-
tems are designed for room volumes up
to 175 m
3
/ 6200 ft
3
(HT312A) or 250 m
8800 ft
3
(HT315A) with maximum listening
distances up to 6.1 - 7.6 meters (20-25 ft).
They are designed to perform well both as
free-standing 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. The fast, low distor-
tion amplifiers are capable of driving a stereo
system to peak output levels in excess of 124
dB SPL at 2 m (HT315A) or 123 dB SPL at
2 m (HT312A) with music material. Versatile
crossover controls allow for precise matching
of the loudspeaker system to different acous-
tic conditions.
Drivers and cabinet
construction
On the HT315A the low frequencies are
reproduced by an 385 mm (15") bass driver
loaded with a 110 liter vented box. The
-3dB point is 33 Hz and the low frequency
response extends down to 29 Hz (-6 dB). The
HT312A 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 pro-
prietary 130 mm (5") direct radiating cone
3
/
for the MF and a 25 mm (1") metal dome for
the HF loaded by proprietary Directivity Con-
trol Waveguide. All drivers are magnetically
shielded.
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 HT315A and 420 Hz and 3.2 kHz on the
HT312A. 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.
Amplifiers
The bass, midrange and treble amplifiers
on the HT315A produce 400 W, 120 W and
EC Declaration of Conformity
This is to certify that the Genelec HT312A and HT315A
Active Home Theater Systems conform to the following
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 Voltage Directive73/23/EEC, EMC Directive 89/336/
EEC and 93/68/EEC
Signed:
Ilpo Martikainen
Position:
Managing Director
Date:
3-October-2005
120 W of short term power. The HT312A has
a 180 W amplifier for the low frequency driver
and 120 W amplifiers each for midrange and
treble drivers. The amplifiers are designed to
operate at very low THD and IM distortion
values and incorporate special circuitry for
driver overload protection and amplifier ther-
mal protection.
Installation
Each loudspeaker is supplied with an inte-
grated amplifier unit, a mains cable and an
operating manual. Once unpacked place the
loudspeaker in its required listening position,
taking note of the line of the acoustical axis
(see Figure 1).
Sufficient cooling for the amplifier must
be ensured. The minimum clearance for the
amplifier is 10 centimeters (4") to any object.
The space adjacent to the amplifier must
either be ventilated or sufficiently large to
dissipate heat so that the ambient tempera-
ture does not rise above 35 degrees Celsius
(95°F). If the loudspeaker is flush mounted
into the wall structure, the amplifier can be
placed separately into an equipment rack
using an optional rack mount kit (see sec-
tions 'Flush mounting' and 'Accessories').
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. Audio input is made via a
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