Delayed auditory feedback basically makes anyone sound drunk.
From what I can work out it sounds like I get a copy processed via software and a copy processed via hardware giving me two coming through the system a few milliseconds apart.
With only some users experiencing this I’m not sure if it’s a hardware batch or if a mixer software upgrade hasn’t installed properly and it’s causing funkiness.
Yes, this sounds very accurate actually and the outcome to the person speaking is exactly that!
It could be that many people haven’t tested it and those who do, who don’t use a microphone often, won’t fully hear or understand what is going on and think it’s just normal. However, if you speak down a microphone on a weekly basis you notice it straight away
So is this a software issue or a hardware issue?
I’m starting to have more events in which I colaborare with MCs, singers, instrumentalists but not enough to justify buying and carrying an additional mixer. And they can’t work with the delay. We’ve tried and they can’t perform anything for more than 5 seconds.
I wanna add my 2 cents to this matter.
I was planning on syncing external gear with my SC Live 4. I thought of using the AUX2 input to blend the 2 music sources.
However, while setting it up, I immediately experienced a noticeable latency.
I did some investigation and I have captured a small WAV file that visualizes the issue.
With some wiring I had the direct output of the source on the right channel, and the SC Live 4 master output on the left channel. You can see there is a 40ms delay.
So, to clarify:
Sound source is on mono channel of mixer, assigned to both sub and main outputs
Left channel: Mixer Sub Out → SJ Live 4 Aux in → SJ Live 4 master out → Focusrite left IN Right channel: Mixer Main Out → Focusrite right IN
The mixer is not the issue, as it keeps the audio signal analog. I bought this yesterday and immediately updated to the latest firmware.
Is this a bug? Because I would expect the sound to travel through without any form of processing.
I found other cases on the EngineDJ forums, but no official statement regarding this..
I did filed a bug report at Denon Support, let’s see how they’ll respond. 
Was this test valid for the mic as well as the Aux in?
It’s around the exact same latency we saw on the Mic (around 40ms) which will explain the inputs if so. I think the Aux in and Mic share the same circuit so this would explain it.
I did not test the MIC input, but as you stated, it’s almost certain it uses the same internal circuitry.
The 50ms is regarded the point where the “speech jammer” effect starts work most effectively on humans.
Most delays that produce a noticeable effect are between 50–200 milliseconds (ms)
I’ve posted it above but the effect on a mic sounds like this:
Ah yes - that confirms having that kind of delay is killing for it’s use case.
For me personally, I was planning on jamming on a digital drumpad, a Roland HPD-20 HandSonic. But doing this while hearing myself drumming 40ms later is… non-optimal.
