Genelec AOW312B User Manual download pdf (Page 3)

to the wall with suitable screws for carrying

the loudspeaker's weight of 43 kgs (95 lbs).

The maximum tilt angle for the loudspeaker

enclosure is ±5 degrees. Do not install the

enclosure horizontally.

The mounting brackets are pre-drilled for

enclosure alignment angles of -15°, 0° and

+15°. If necessary, you can drill new holes to

the brackets for exact loudspeaker alignment.

The rubber isolators provided must be placed

between the brackets and loudspeaker enclo-

sure.

It is recommended that the surroundings

of the loudspeaker are covered with about

10 cms (4") of rockwool or similar damping

material. If the loudspeaker is covered with

a cloth, it must be acoustically transparent

and a free space of at least 2 cm (3/4") left

between the front bafﬂe and the cloth.The

reﬂex port of the loudspeaker enclosure is

located on the left side of the enclosure (see

Figure 2). The airﬂow from the port must not

be obstructed, and a free space of at least 5

cm (2") is required before the port.

The RAM4 ampliﬁer is shipped with a pair

of rack ears to provide ﬁtting into a 19" rack

and a set of feet for placement on a shelf or

table.

Sufﬁcient cooling for the RAM4 ampliﬁer

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 ampli-

ﬁer. 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 tempera-

ture does not rise above 35 degrees Celsius

(95°F).

Connections

Each loudspeaker is delivered with two

Speakon 8-pole cable connectors. There is

one 8-pole Speakon output marked LOUD-

SPEAKER CONNECTOR on the amplifier

and two inputs (one on each side) on the

loudspeaker enclosure. Use only one of these

inputs at any time. The inputs may not be

used for daisy-chaining several loudspeakers

or connecting two ampliﬁers to a single loud-

speaker. The 4-pole Speakon output (LED

CONNECTOR) on the ampliﬁer is not used

with the AOW312B.

Measure the required length of 8 pole cable

and secure the connectors on it 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/loud-

speaker pairs when installing multiple loud-

speakers at the same time. Each ampliﬁer and

loudspeaker packed together are calibrated

together for optimal performance and marked

with the same identiﬁcation number.

Before connecting up, ensure that the mains

switch is off. Check that the mains voltage

selector on the ampliﬁer back panel is correctly

set to your local voltage. Audio input is made

via a 10 kOhm balanced XLR connector, but

unbalanced leads may be used as long as pin

3 is grounded to pin 1 of the XLR (see Figure

7). Once connection has been made, the loud-

speakers are ready to be powered-up.

Access to the

front panel controls

The decorative front panel of the RAM4

ampliﬁer is held in place by guide pins and

two magnets. To remove the panel, pull it

straight out.

Setting the input sensitivity

Adjustment of the input sensitivity of each

RAM4 ampliﬁer can be made to match the

output of the decoder or other source, by

use of the input sensitivity control on the

ampliﬁer front panel. A small screwdriver is

needed for the adjustment. The manufac-

turer default setting for this control is -6 dBu

(fully clockwise) which gives an SPL of 100

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

full output level from the AOW312B an input

level of +10 dBu is needed at this setting.

Autostart and remote control

The RAM4 ampliﬁer unit is equipped with

an “Autostart” function, which automati-

cally turns the ampliﬁer to “standby” mode

if an input signal has not been detected

for approximately thirty minutes, and back

to “on” mode when the signal returns. The

function can be deactivated by turning the

“AUTOSTART” dip switch on the back panel

of the ampliﬁer to “OFF”.

The ampliﬁer mode can also be switched by

a remote control unit connected to the respec-

tive 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 loud-

speaker at the same time. Activate the func-

tion by turning the "REMOTE CONTROL" dip

switch to "ON". Note that the remote control

function overrides the “AUTOSTART” dip

switch function.

Setting the tone controls

The acoustic response of the system should

be adjusted to match the acoustic environ-

ment. The adjustment is done by setting the

ﬁve tone control switch groups ‘bass tilt’, ‘bass

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

on the ampliﬁer front panel. The manufactur-

er’s default settings for these controls are ‘All

Off’ to give a ﬂat anechoic response. Figure 8

shows the effect of the controls on the ane-

choic response. Always start adjustment by

setting all switches to the ‘OFF’ position. Then

set only one switch per group to the ‘ON’ posi-

tion to select the response curve required. If

more than one switch is set to ‘ON’ (within

one switch group) the attenuation value is no

longer accurate.

Maintenance

The air ﬁlter on the left side of the RAM4

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

within the loudspeaker enclosure or the

amplifier unit. Any maintenance or repair

should only be undertaken by qualiﬁed serv-

ice personnel.

Safety considerations

Although the AOW312B loudspeaker and

RAM4 amplifier have been designed in

accordance with international safety stand-

ards, to ensure safe operation and to main-

tain safe operating conditions, the following

warnings and cautions must be observed:

1. Servicing and adjustment must only

be performed by qualiﬁed service

personnel. The ampliﬁer must not be

opened.

2. Do not use the ampliﬁer with an

unearthed mains cable or unearthed

mains connection as this may lead to

personal injury.

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