Genelec 7060B ,

The LFE channel on the 7060B, 7070A and

7071A can be set to two frequency ranges:

19 to 85 Hz or 19 to 120 Hz by using the

"LFE BANDWIDTH" switch. If the LFE signal

includes higher frequencies than 120 Hz,

they can be monitored by using the "Redi-

rect" function: Set "LFE BANDWIDTH" switch

to "85" and the "REDIRECT" switch to "ON".

Now the subwoofer reproduces LFE frequen-

cies up to 85 Hz and reroutes all higher LFE

content to the front center channel. This is

the most flexible setting for LFE signal man-

agement, as it ensures that all LFE content

can be monitored in all situations and encod-

ing formats. Note that the "Redirect" function

is not enabled when the "LFE BANDWIDTH"

switch is set to 120 Hz.

Typical applications of different

LFE bandwidth settings

As stated above, using the 85 Hz LFE band-

width setting with "Redirect" function is the

most universal configuration for LFE monitor-

ing. However, there are situations when the

band-limited LFE settings serve a definite

purpose.

Limiting the LFE bandwidth to 85 Hz without

using the "Redirect" function can be used to

simulate the effect of some consumer decod-

ers that do not replay information above 80

Hz on the LFE channel when the bass man-

agement is used. Checking the multichannel

mix with this setting on lets you know how it

translates in systems with this limitation.

The 120 Hz LFE bandwidth setting com-

plies with the replay systems of movie theat-

ers and cinemas. 35 mm movie soundtracks

use the LFE channel to reproduce a band-

width of 20 - 120 Hz through dedicated

subwoofers. In this case the LFE and main

channel bandwidths overlap between 85 and

120 Hz, which may create unwanted acous-

tical summing if the same signal is present

in both channels. To avoid this, the LFE con-

tent should be kept completely different (de-

correlated) from the low frequency content

of the main channels when mixing music

and sound effects for film release.

Using the LFE +10 dB function

In Dolby Digital and DTS encoding formats

the LFE channel has to be monitored with

+10 dB gain in relation to the main channels.

The object is to increase the recording head-

room of the LFE channel. Consumer and the-

atrical decoders automatically add +10 dB of

LFE gain to restore the level balance.

The "LFE +10 dB" function on the 7060B,

7070A and 7071A subwoofers is designed to

add the +10 dB gain to the LFE channel in the

production stage, if it is not already done in

the output matrix of the mixing console. The

function is activated by switching the "LFE

+10 dB" dip switch on the subwoofer's first

switch group to "ON" or by using the remote

control. A yellow LED indicates that the func-

tion has been activated.

The "LFE +10 dB" function should not be

used in following cases:

• If the +10 dB LFE gain is already

implemented by another device.

• When producing an audio format that

does not require the use of +10 dB

gain on the LFE channel, such as

DVD-Audio (MLP), SACD (DSD) etc.

• When monitoring a decoded Dolby

Digital or DTS soundtrack. The decoder

will automatically provide +10 dB

LFE gain.

Using multiple subwoofers

Genelec 7060B, 7070A and 7071A subwoofers

are equipped with a "SUM OUT" connector to

provide an easy way of coupling two or more

subwoofers together in high SPL applications.

Table 2 shows the recommended configura-

tions with different Genelec monitors. Connect

an XLR cable from the "SUM OUT" connector

of the "master" subwoofer to which the main

monitor channels are connected, to the "LFE

IN / SUM IN" connector of the other, "slave"

subwoofer and turn the "SUM IN MODE" dip

switch on the "slave" subwoofer to "ON".

When two subwoofers connected in this

way are positioned close to one another,

bass level increases by 6 dB. Three sub-

woofers give an SPL increase of 9,5 dB and

four subwoofers 12 dB compared to a single

subwoofer. Adjust the sensitivity control of all

subwoofers in the group to match the SPL

level of the main monitor system.

Phase and Bass Roll-Off adjustments

should be done individually for each sub-

woofer in the chain, especially if they are not

placed close together. To check the phase

alignment for the "master" subwoofer switch

off the "slave" subwoofer and follow the

instructions given in the previous sections.

To adjust the phase alignment of the

"slave" subwoofer, you need to switch off

the "master" subwoofer, connect a signal

cable from the "slave" subwoofer's "FRONT

CENTER OUT" connector to the center chan-

nel monitor and switch the "SUM IN MODE"

switch to "OFF". This effectively changes

the "slave" to "master" mode and the phase

adjustment can be carried out. Return the

connections and "SUM IN MODE" setting on

the "slave" subwoofer back to the "SUM IN"

mode after completing the adjustment.

Safety considerations

The LSE series subwoofers have been

designed in accordance with international

safety standards. However, to ensure safe

operation and maintain the unit in safe oper-

ating condition, the following warnings and

cautions must be observed:

• Do not expose the subwoofer to water

or moisture. Do not place any objects

filled with liquid, such as vases on

the subwoofer or near it.

• Do not place naked flame sources like

lighted candles on or near the

subwoofer

• Servicing and adjustment must only

be performed by qualified service

personnel.

• Opening the connector panel is

strictly prohibited except by

qualified service personnel.

• Always use a mains power connection

and cable with protective earth. Failing

to do this may lead to personal injury.

• Note that the amplifier is not completely

disconnected from the AC mains

service unless the mains power cord

is removed from the amplifier or the

mains outlet.

Warning!

This equipment is capable of delivering sound

pressure levels in excess of 85 dB, which

may cause permanent hearing damage.