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from the listening position (see ITU-R

BS.775-1 recommendation for speaker

placement for multichannel audio).

If the frequency balance is not right, try

moving the subwoofer slightly to the left

or right so that different room modes are

excited at different levels. Positioning the

subwoofer close to a corner will boost the

bass level at lower frequencies and may

cause asymmetrical spatial imaging. If

you are using two subwoofers, try placing

them asymmetrically relative to the side

walls. Sometimes moving the subwoofers

apart into the front corners helps with

problematic rear wall reflections and the

loss of mutual coupling is compensated

by the bass boost caused by corner posi-

tioning.

Although the 7073A subwoofer is mag-

netically shielded, it may cause some pic-

ture distortion if placed near very sensitive

video monitors or computer displays.

Minimum clearances to

walls or other objects

The power amplifiers are attached to the

lower part of the aluminium grilles, which

function as a heatsink. Do not cover the

grilles or place the subwoofer so that

there is less than 10 centimeters (4") of

free space in front of the grilles.

The reflex port and connector panel

should always have a clearance of at

least 20 centimeters (8") to any objects

to ensure proper function of the port and

cooling for the electronics attached to the

connector panel.

Flush mounting the

subwoofer

If the 7073A subwoofer is flush mounted

into a wall or a cabinet, it is important

to ensure unrestricted airflow from the

reflex port and cooling for the electronic

components. This can be done by making

the recess 20 centimeters (8") wider than

the subwoofer. Place the subwoofer into

the right end of the recess with the driv-

ers' side facing the room. This leaves

20 centimeters (8") of free space on the

connector panel and reflex port side. The

height and depth of the recess should not

be any bigger than those needed to fit the

subwoofer flush with the wall surface (See

Fig 4-5).

If the 7073A is flush-mounted in a semi-

absorbing front wall structure and the

depth of the absorbing material exceeds

the depth of the 7073A cabinet, there is

a risk of low frequency comb filtering due

to the reflections from the wall behind the

subwoofer (See Fig. 6.).

Setting the input sensitivity

The subwoofer requires input sensitivity

alignment to the source to obtain a cor-

rectly balanced system. The input sensi-

tivity control is located on the connector

panel of the subwoofer. An input voltage of

-6 dBu with a -6 dBu input sensitivity set-

ting will produce 100 dB SPL @ 1m in free

field. To obtain a 110 dB SPL output an

input voltage of +10 dBu is required when

the input sensitivity is set to 0 dBu.

Setting the Bass Roll-Off

switches

The acoustic response of the subwoofer

may have to be matched to the charac-

teristics of the room and the positioning

in which it will be used. To adjust the

subwoofer to match these characteristics

use the ''Bass Roll-Off' control switches

located on the connector panel. Table 1

Figure 3. Flush mounting the subwoofer. Note the clearance needed on the reflex port side.

Table 1. Suggested Bass Roll-Off settings

20 cm (8”)

GENELEC

GENELEC GENELEC

GENELEC

f ~ 2-8 Hz

HEAVY WOODEN

OR CONCRETE

WALL

VIBRATION

ISOLATORS

HEAVY

WOODEN

CONCRETE

WALL

ABSORBING

MATERIAL

VIBRATION

ISOLA

TORS

f ~ 2-8 Hz

ABSORBING

MATERIAL

HEAVY

WOODEN

CONCRETE

WALL

VIBRATION

ISOLA

TORS

f ~ 2-8 Hz

Figure 4. Flush mounting the subwoofer in a

non-absorbing wall.

Figure 5. Correct flush mounting in a semi-

absorbing wall.

Figure 6.Incorrect flush mounting in a semi-

absorbing wall.

Subwoofer

placement

Bass Roll-Off

setting

Near to a wall

-2 dB

In a corner

-6 dB

Flush mounted

-2 dB

1 2 3 4 5 6 7 8

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