How is that possible since the ADA is unaware of your 4 subs?

QSC has to be doing part of "Bass Management" and I'm sure it's unaware of what the ADA has done.

That's why a single vender solution is often safer. The two boxes can coordinate with each other. Not guaranteed though. There are specific bullets about the Mach IV on the TEQ (that's a good sign) but you need to talk to ADA.

- Fiddler (IMHO)

If you think listening to music is fun, try learning an instrument.
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