Bedienungsanleitung Allen-Heath GL2800 (Seite 32 von 42) (Englisch)

541345

Zoom out

Zoom in

Vorherige Seite

1/42

Nächste Seite

32 GL2800 User Guide

Mix and 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, keyboards and

sound effects 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 subs can be separately driven in several ways. A common

method is to use the independent M mix. Route all sources to L-R.

Route the sources you want in the subs to both L-R and M. Feed the

LR to a stereo crossover to drive the top speakers, and M 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. The PA overall level is adjusted by moving

the L, R and M (sub) master faders together.

Another method that has become popular is to use an Aux mix to

drive the subs. This is referred to as ‘aux-fed subs’. 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 GL2800 overcomes this with the

monitor mode ‘REV’ switch that swaps the rotary aux master with the

related fader group master. This switch is recessed for protection

against accidental operation. This puts the aux (sub) master on to a

fader next to the PA tops master faders. The result is you get all

master faders aligned for simultaneous control, individual mutes and

meters, and three properly balanced XLR outputs. We recommend

that you use Aux 8 for the sub feed. This gives you 4 master faders

next to each other, for example, Subs, L, R and C.

Other M Output Applications Apart from the main PA C mix

or sub-bass speaker mix, other examples include L+R sum mono fill,

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

providing two more subgroups to M, engineers PAFL wedge feed…

and more.

Using the channel Direct Outputs

Recording - Default factory setting is pre-fade so that your live fader

mixing does not affect the recording. Use the channel recessed PRE-

EQ switches to select either post-EQ or pre-insert, pre-EQ for your

recording. Post-EQ lets you use the EQ for source correction affecting

the recording too. Select pre-EQ if you do not want your compressor

and EQ to affect the recording.

Monitor mixing - You could also patch DIR OUT into a matrix EXT IN

to add a ‘more me’ channel into a monitor send created from the

groups and LR. If preferred you can reconfigure the direct outputs to

post-fade by setting internal jumpers.

Single effects - Use post for feeding an effects processor with one

source only, for example a dedicated reverb on lead vocals or snare.

GRP8

AUX8

AFL

LISTEN

AUX9-10

MRL8

MUTE MUTE

SIG

PK!

SIG

PK!

SIG

PK!

SIG

PK!

0dBOO

L-R TO M

GRP8

TO LR

GRP8

TO M

MUTE

STEREO

+10OO

9-10

AUX

+10OO

AUX

AFL

REV REV

PAN

LRCAUX8

TOPSSUBS

GRP8

MRL8

LRSUBS

TOPS

(WEDGE)MOUT

OUT

DIRECT

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

Allen-Heath GL2800 Seite 32

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info