Topic: 3 Stacks, 2 PAs – how to patch this? | Allen & Heath Digital Community

3 Stacks, 2 PAs – how to patch this?

This topic contains 3 replies, has 2 voices, and was last updated by MarkPAman 2 years ago.

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2022/03/31 at 7:19 am #106625

MarkPAman
Participant

Hi

So this summer I have a “festival” for which the intention is to run two stages, but as they will be right next to each other, only use 3 PA stacks.

How would anybody go about sorting it so that speaker 1&2 are L&R or 2&3 are L&R?

I should have all 3 matrixes available, and probably 3 spare mixes after sorting monitors (From FOH desk, with iPad operator I hope).

Plan is for SQ to do main stage with a second desk (could be QU-PAC) running 2nd and sending its L&R to the SQ.

I can easily see how to do this if I run in mono, but can’t get my head around keeping it stereo.

I don’t want to alter patches between bands – but is that being silly?

Thanks

2022/03/31 at 8:55 am #106626

ioTon
Participant

Hi Mark,

The only thing you have to do, is summing for Stack 2 the R of Desk1 and L of Desk2.

Desk1 L -> Stack1
Desk1 R -> Summing Device -> Stack2
Desk2 L -> Summing Device -> Stack2
Desk2 R -> Stack3

Better to do this Analog, eg that device is great:https://apb-dynasonics.com/product/mixswitch/#4

If you want to sum digital, be aware of the Latency, to stay phase coherent!!
So L and R have to go the same signal-path!

greetings dd

2022/03/31 at 9:05 am #106627

ioTon
Participant

It should work with 2 matrix busses in SQ.
One Mono, one Stereo.

Qu L -> ExtIn Matrix 1 -> stack 1
Qu R -> ExtIn L!! Matrix 2 -> stack 2
SQ L -> L Matrix 2 -> stack 2
SQ R -> R Matrix 2 -> Stack 3

Cheers

2022/03/31 at 9:53 am #106628

MarkPAman
Participant

Brilliant!

I’d considered analog summing, but had hoped to find a solution with no extra hardware.

Your second suggestion should work fine – I’d not considered the Extn In.

Many thanks 😀
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