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DEQ2496 for DSP?

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Posted on August 22, 2020 at 11:52:53
LtMandella
 I am about to pull my DEQ2496 out of storage and try using it for room DSP EQ using the built in automated RTA, their mic, and toslink in/out.

Anyone have experience with the DEQ2496 RTA and automated DSP EQ?

the signal path will be:

RPI 3B+ USB output -> musical fidelity usb to s/pdif converter -> DEQ2496 toslink input, processing in DEQ, then from DEQ toslink output to musical fidelity toslink DAC input.


Since all processing is in digital domain up to the DAC, I am expecting to not hear any noticable degradation, just the DSP EQ.




 

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RE: DEQ2496 for DSP?, posted on August 24, 2020 at 13:34:26
lokie
Audiophile

Posts: 1990
Location: Georgia, USA
Joined: January 28, 2003
 Keep us posted. Im be interested in your progress here.

Sometimes mixing pro and home audio isn't seamless with mismatches in xlr/rca connectors and impedance.

 

RE: DEQ2496 for DSP?, posted on August 24, 2020 at 13:50:15
LtMandella
 My current plan is to use usb to optical-s/pdif converters to convert the USB output from either RPI 3B+ or Computer streamers, and use the optical s/pdif inputs-outputs on the DEQ2496, finally with processed optical output of DEQ going to DAC.

Will keep you updated. I think optical s/pdif using toslink is quite standardized so I do not anticipate any cabling mismatches, and of course optical is electronically isolated, so no impedance mismatches.

Optical does however limit resolution to 24/96 but I can live with that if I like what the DSP does.

 

RE: DEQ2496 for DSP?, posted on August 24, 2020 at 17:19:17
kh6idf
Audiophile

Posts: 1474
Location: Texas
Joined: May 2, 2001
 I still have a DEQ2496, and at one time was using it for room correction


It should only be used below about 200 Hz, from what I have read.

And perform the auto-EQ on one channel at a time instead of using the stereo option. Follow the appropriate section in the manual and it is not too difficult.

I have a better room now, different (non-dipole) speakers and rely on passive bass traps instead of active EQ.

 

RE: DEQ2496 for DSP?, posted on August 25, 2020 at 18:28:34
George6
Audiophile

Posts: 182
Joined: November 18, 2012
 I have used a DEQ2496 for the last ten years without problems. As long as you use it in a digital path, it sounds good.
One major plus is the default limiter which prevents any digital output signal from clipping. When uncertain of the source material I always route it through the DEQ in bypass mode.

The RTA provides a good start, and is effective through the full bandwidth.
After completing it, running a few sweeps with a decent SPL meter will let you manually adjust the RTA results, or add specific PEQ, for a smoother response.

Using the RTA is not described very well in the manual, but somewhere online there is a revised set of instructions from Behringer on how best to do this. If you can't find it, let me know.

 

RE: DEQ2496 for DSP?, posted on August 26, 2020 at 05:33:39
lokie
Audiophile

Posts: 1990
Location: Georgia, USA
Joined: January 28, 2003
 "Optical does however limit resolution to 24/96"

24/96 is where I "landed" after a fair amount of exploring. I have optimized my digital accordingly and have no regrets or audiophile nervosis to fidget anymore.

The isolation of optical certainly has its charms... I've never given it much of a chance. Listend to it once or twice and moved on but cant remember why?

My learning curve with REW and the Berhinger is a bit of a slog. I wish some of you guys were in my neighborhood... you could enjoy a very expensive bottle of wine showing me some of the set up nuances.

 

RE: DEQ2496 for DSP? (update), posted on January 16, 2021 at 20:25:09
LtMandella
 Finally have the DEQ2496 in the system and I am using it at this time just for GEQ and a bit of balance adjustement.

Digital domain only, optical in from PC and optical output going to a MODI3

Sounds great, the EQ helps to tighten up and deepen the base, and the balance is nice.

I can detect absolutely no deterioration vs. just the direct optical from the PC to the MODI3.

Vocals sound fine, no graininess or sybilance increase...

I do have the recommended microphone for RTA somewhere in storage, eventually I will dig it out and give the RTA a try and see if I can tighten up the bass even more with the parametric EQ.

The MODI3 seems to like the optical input also, so I am a happy camper.

 

RE: DEQ2496 for DSP?, posted on February 26, 2021 at 09:17:26
LtMandella
 I will run the RTA this week.

One issue I thought of. I was thinking about firing up one of my analog radios soon - either Macintosh MR-77 or Sony XD. But being analog I don't particulary want to digitize their output through the 2496 because I have heard the analog inputs and ADC in the Behringer is not great. So I won't have realtime room correction available for those sources, which kind of sucks.

For the LP recordings, I am planning to digitize those anyway, so I guess I might as well use 24x96 so they can play back though the DSP without recoding.

 

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