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Rack Adapter (HT315A-400)
This model can be used for the HT315A model. The kit contains one
12U rack mount chassis with internal cable and connectors in place,
one Speaker Cable Adapter and four 4 x 2 mm screws. Note that the
Speakon 8- and 4- pole cables between the loudspeaker and the rack
adapter are not included in this kit. They should be ordered as a sepa-
rate item.
To install these rack adapters, the speaker cable adapter is fixed onto the
rear of the loudspeaker and the internal speaker cable (with molex type
connector) is connected to this cable adapter. The amplifier unit is mounted
in the 19" rack adapter chassis. There should be at least 10 cm (4") or 1U
of free space above AND below the 19" chassis to ensure sufficient air flow
for cooling.
In larger active Home Theater systems, the amplifiers are always delivered as a separate rack mountable
box. For the AOW312 On-Wall loudspeaker, HT324A, HT324AC and HT330A, each rack mount box is
48.3 cm (19") wide and 31 cm (12 3/16'') or 7U high. Each amplifier should be well ventilated in the front
and rear. These amplifier models have dual slow speed fans to provide proper cooling of the electronics.
These fans might generate some noise when in operation, so a proper planning of their location in the
installation is recommended.
For the 1035B and 1036A systems, each amplifier unit is 48.3 cm (19") wide and 75.5 cm (29 3/4") or
17U high. These amplifier models have four slow speed fans that might also generate some noise when
in operation, so it is recommended that they are installed outside the Home Theater room.
3.7
Acoustically 'Transparent' Screens
Genelec loudspeakers are ideal for use behind acoustically transparent video projection screens. The
waveguide helps to focus the high frequencies through the material and so project the sound into the
room. In addition, the room response controls can be used to compensate for the high frequency roll-off
created by the screen. Finally, if only the center loudspeaker is being placed behind a perforated screen,
the room response controls can be used to timbre match the L-C-R channels.
One note of caution is to be sure that the front baffle of the loudspeaker is placed far enough from the
screen so that the screen does not flutter when the loudspeakers are played at a high SPL. Bass manage-
ment can help to reduce this problem as the bass content of the front channels can be redirected to the
subwoofer, which is typically placed away from the screen. However, care must still be taken as placing the
loudspeaker too close to the screen can have a negative effect on the mid band frequencies. There should
be at least 30 cm (12") between the loudspeaker and the screen. Contact Genelec for recommendations
on individual models.
A useful by-product of the DCW
shape around the midrange and treble drivers, thus reducing the chance of standing waves. However, it is
recommend that loudspeakers placed behind projection screens are angled so that the front panel is not
parallel to the screen. This further prevents standing waves forming between the screen and the loudspeaker
baffle.
Graph 1 shows the effect of typical screens. These responses are all 1/3rd octave smoothed in the
frequency domain to simulate what is actually perceived in the room by the human ear. It is easy
to see that placing loudspeakers behind unperforated screens is not a good idea! Both the per-
forated screen and the cloth screen show considerable improvement in the acoustic perform-
ance. Of course, the acoustics are not the only consideration in a Home Theater, so what maybe
best solution for sound quality is not necessarily going to be the best solution for video quality.
is that reflected sound from the screen is scattered due to the curved
TM
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