Genelec 7070a, 7071a 用户手册

Pro Logic) should not be connected to the 

"LFE IN" input. See section "Subwoofer in 

analogue matrix sound systems".

SUM OUT: Use this output connector when 

you want to link another subwoofer to your 

system. "SUM OUT" carries an unfi ltered 

sum of signals combined from all input chan-

nels. See section "Using multiple subwoof-

ers".

FRONT L, C, R CHANNELS IN/OUT: Use 

these connectors for the Front Left, Center 

and Right channels of a surround sound 

system or the Left and Right channels of 

a Stereo system. Connect line level signal 

cables from your signal source to their respec-

tive "LEFT IN", "CENTER IN" and "RIGHT IN" 

connectors. Then connect the subwoofer to 

your main monitors with XLR cables from the 

"LEFT OUT", "CENTER OUT" and "RIGHT 

OUT" connectors. All "L, C and R OUT" chan-

nels are high pass fi ltered with the fi ltering 

frquency fi xed at 85 Hz (12 dB/octave).

REAR L, C, R CHANNELS IN/OUT: Use 

these connectors for the Rear Left, Center 

and Right channels of a surround sound 

system. The connection is made in the same 

way as with the Front channels.  Also these 

channels are high pass fi ltered at 85 Hz. 

Once all connections have been made, the 

subwoofer and main monitors are ready to be 

powered up.

Positioning in the room

The placement of the subwoofer in the room 

affects the overall frequency response and 

sound level of the system dramatically, as at 

low frequencies the effects of the room are 

strong. Even a slight change in the subwoof-

er's location can make a marked difference 

in the frequency balance and often patient 

and methodical experimentation and testing 

is needed to fi nd the optimum placement. 

The placement will affect the phase 

difference between the main monitors and 

the subwoofer, and also the bass roll-off rate. 

These effects can be compensated by the 

use of the controls in the amplifi er  unit; 

but we recommend that at fi rst you leave 

the switches untouched and concentrate on 

fi nding the position where the subwoofer 

gives the smoothest response, and only then 

use the controls to fi ne-tune the balance and 

phase alignment between the subwoofer and 

the main monitors. 

To begin with, place the subwoofer slightly 

offset from the center of the front wall. 

The  recommended distance to the wall is 

less than 60 cm / 24" measured from the 

subwoofer's driver (See Fig. 3). This position 

gives increased acoustic loading (and SPL) 

due to the proximity of the front wall and fl oor. 

Cancellations from the front wall and fl oor are 

also avoided. Front wall cancellation for the 

85 Hz high pass fi ltered main speakers 

can be eliminated by placing them at least 

110 cm / 43" away from the front wall. In 

a multichannel system the main monitors 

should ideally be positioned symmetrically 

and at an equal distance from the listening 

position. 

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 refl ections and the loss of mutual 

coupling is compensated by the bass boost 

caused by corner positioning.

Figure 3. Recommended distances to

the front wall

Figure 1. 7070A's amplifier panel, connectors and controls.

Figure 2. XLR to RCA connector for 

unbalanced operation.

Gen 7060A+7070A+7071A

22.5.2002, 11:04

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