TOPIC:

NiToNi wrote:

Nope, Flex. And it’s not clear at all from above. I’m interested neither in ADC latency since SPDIF input nor as with all processing bypassed but with full use of EQ (all bands on all channels) and crossover (LR4 on all channels). 

This for studio use (tracking) where even 5ms is getting annoying and unusable.  
 

It seems to me you don't understand how these platforms work.
The 3mS latency of the Flex/2x4HD does not have the DSP processing bypassed.  You're just not applying any EQ, or xover, or etc, so as to characterize just the inherent latency.  That's what we're talking about here.  I thought that was obvious.

When you start applying crossovers and equalization, the delays become frequency dependent and a single number no longer defines the delay.

I suggest to read up on this topic.

Dave.

I agree.  I noticed that a crossover adds more latency than just modifying a PEQ filter.  That said, do you know the range of latency which it adds?  I’d like to use it for my LR in a home theater setup so lip sync matters. 

An IIR crossover filter will add a frequency-dependent delay equivalent to an analog filter of the same slope.
Any of the standard speaker design programs will allow you to simulate.

A miniDSP unit programmed with IIR filters will have exactly the same relative delays as an analog active crossover......but with the addition of the inherent latency (frequency-independent delay) of the particular unit.
Dave.

If you factored out using an FIR/Convolution, what is the resultant range of latency using PEQ import from REW?  For example:  Best case: 3ms;  worst case: 10ms?  Something like that...  I'm simplifying the question based off my naivete.

tjcinnamon wrote:

If you factored out using an FIR, what is the resultant range of latency using PEQ import from REW?  For example:  Best case: 3ms;  worst case: 10ms?  Something like that...

It sounds like you already have the hardware so I'd suggest you just give it a try. With lip sync issues some are more sensitive than others and what matters is what you find acceptable.

(If you really want numbers for specific examples you could measure these for yourself using REW.)

I don't have a Flex.  Also, my current one is for my subs and it would be a massive production to unhook everything.  I wasn't sure if people noticed.

For lipsync, I think I could compensate on my AVR (to a degree).  I'm pretty sensitive to that and I obsess over it. 

tjcinnamon wrote:

I don't have a Flex.  Also, my current one is for my subs and it would be a massive production to unhook everything.  I wasn't sure if people noticed.

For lipsync, I think I could compensate on my AVR (to a degree).  I'm pretty sensitive to that and I obsess over it. 

I thought AVRs could usually only delay audio more, not delay the video signal?

I think currrently my speakers are delayed to about 7ms.  I could move that back to 0 on the AVR for a negative delay.  That's about as far as I could go though.

I doubt you'll have any lip-sync issues unless using some significant FIR filtering.

More of issue IME,  is there's imbedded lip-sync problems in the actual source material.  Usually from some sort of streaming source.  Very distracting! 

Dave.