Manual Allen-Heath GL 2400 (page 30 of 40) (English)

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30 GL2400 User Guide

Aux-Fed Subs Driving the PA system sub bass speakers with

their own mix has two main advantages. First, the mix is much cleaner

because only sources that generate the low frequencies, for example

kick drum, bass guitar and keyboards, are sent to the subs. Low

frequency bleed from these sources into open microphones such as

vocals and snare is eliminated from the PA much more effectively than

using just the channel filters. Second, the sub bass amplifier is only

working with the sources needed. It is not wasting power reproducing

unnecessary pickup.

The sub can be separately driven in several ways, for

example using a group, a mono or ‘C’ bus, or using an aux.

Using an aux send has become a popular method on the

smaller consoles. Simply feed the LR to a stereo crossover

to drive the top speakers, and a post-fade aux send to a

mono crossover to drive the sub speakers. Refer to the

speaker manufacturer for recommended crossover

frequency, usually within the range 80Hz to 120Hz. Align the

system so that the normal unity gain position of the channel

fader and aux send result in the correct speaker balance.

For sources you wish to send to the sub, turn up the channel

aux send to its unity 3 o’clock position. Avoid the temptation

to ride the aux send to create more or less sub as this may

upset the natural speaker balance or cause problems for

listeners in different parts of the room.

One problem with using the aux in this way is that it

becomes difficult to balance the top and sub speakers if you

need to adjust the overall volume of the PA. Typically the LR

(tops) use fader masters, and the aux is on a rotary master.

The GL2400 overcomes this with an innovative mode

switch above the master faders that routes the AUX6 mix

master through the M fader and on to the XLR output. This

switch is recessed for protection against accidental

operation. The result is you get three master faders aligned

for simultaneous control, individual mutes, AFL and meters,

and three properly balanced XLR outputs. Note that the

AUX6 rotary master does not affect this sub feed. It does

however independently affect the AUX6 jack output. This

gives you a further advantage that another sub can be

separately controlled using the rotary master, for example to

supplement the stage monitor mix.

Creating a separate C mix As with the aux-fed sub mix

described above, you can set the mode switch to create an

independent mix feeding a dedicated centre or mono speaker. The

channel AUX6 sends become the routing to this mix while the M fader

with XLR output becomes the master, correctly aligned with the L and

R faders. Set the channel aux sends to unity 3 o’clock position, and

release the LR routing switches if you do not want the signal in the LR

speakers as well. The GL2400 gives you the choice of either

mixing the sum of L and R to the M output (mode switch up), or an

independent AUX6 mix to M (mode switch pressed).

Other M Output Applications Apart from the aux-fed subs

and C mix described above, other examples include L+R sum mono

fill, additional mono zone feed, mono recording, mono PA with LR

providing two subgroups to M or a stereo recording… and more.

SUB

TOP TOP

SUB

AUX6 MODE

AUX 6 (POST-FADE)

GL2400

STEREO CROSSOVER

MONO CROSSOVER

OUT M

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Allen-Heath GL 2400 Manual

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