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We had the analyser running through the console last week and the main output was truncated at 24KHz when normally it is clean to 48KHz (being a 96K desk we would expect up to 48KHz audio response)
It turns out it was the dynamic EQ plug-in that was truncating the frequency response to 24KHz.
I then put any rack effect in the main L-R insert and when in line all rack effects truncate the usual 48KHz audio response main output down to 24KHz audio response.
Is this the FX rack running at 48KHz sample rate? (It sure looks like it is)
The DEEP plug-ins on the channels (compressors) do run at 96K and do pass all the way up to 48KHz, so it just seems to be the FX rack that is running at 48K.
Now Allen and Heath sell this desk as having 96K processing, but it sure looks like the FX rack is running at 48K.
Are A&H mis-selling the desk as having 96KHz processing, or is this some form of technical oversight?
UPDATE
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We have found that if the FX rack is running an insert on a mono channel strip the response is good to 48KHz (running at 96K), but the same insert on a stereo channel is only good to 24KHz (running at 48K).
So it seems that it is an issue of whether the plug-in is stereo or mono.
Wow - thanks for that clarification!
I’m very glad to know this, so I guess I’m ok since all my DynEq4’s are running on mono channel inserts.
And yeah, I see your photos are DynEqs on stereo channels during your tests. Glad to know it won’t be a problem for me, since I use them on the mono channels, and really find those DynEqs and their associated PEQs to be really useful!
Can you try to do the same you did, i mean - insert FX to stereo channel then perform a measurement then restart the sq console, check if the insert is still there and perform a measurement again?
Oh sorry, you are right, the enitre live sound and recording industres are wrong making 96k equipment, no one hears the difference with 48k. You should advise A&H to go down to 44.1 for their next gen, it’s useless to go higher.
Dude i just told you i agree. I even personaly put a LPF at 20k on the master out when i mix live shows. Because only babes can hear it. And when the audience is older i lower it. I can go as low as 12k for older people. Because they can’t hear it.
Doesn’t change the fact that a 96k mixer should run at 96k, not 48. Even if you can’t hear it.
We don’t know where the restriction is being applied. Could the algorithm be downsampling to 48KHz when in stereo and they processing it? Yes it could be. But it could also be doing so after processing - perhaps something to do with how the output signal is inserted into a stereo signal path.
Anyway, the specifications of the desk say 20Hz to 20KHz so if you’re getting 48KHz (what, no antialiasing filter slope?) then you’re getting more than you paid for at times so you should be happy. The specs of the mixer do not say 48KHz audio bandwidth. they say 20KHz.
