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In Reply to: Digital equalizer cause phase errors? posted by tantra on April 14, 2007 at 12:24:52:
1. The 32bit floating point may or may not be enough to do all of the math transparently. I suppose it depends on how much equalizing you need to do. I have no experience with the Behringer unit, but I can say that the prosumer stuff that I do own (such as AKAI hard disc recorder) doesn't seem to have enough bits for the 2Buss to make coherent mixing changes.2. Lack of RCA S/Pdif. I guess if you are using the AES EBU connectors this is no biggie. I wouldn't want to use the optical though.
3. Switch mode power supply. *Ughhh!*
4. The low frequency implications to your amplifier. Let's say that points 1,2, and 3 are non issues. Great! However, if you plan on boosting any of the low frequencies by more than 3 dB, your amplifier will have to deal with that and your speakers will have to be able to respond to it. You might be trading room correction for clipping and harmonic distortion. On the other hand if you are only cutting frequencies then scratch that, reverse it.
At the asking price for a new one it will be fun to mess around with and probably worth every penny just for the education.
Follow Ups:
The DEQ2496 has two "32/40-bit floating point SHARC digital processors," supposedly a lot of computing horsepower. I have been using an Alesis Masterlink as a CD transport, sending the AES EBU signal to the DEQ2496, then using a Benchmark DAC1 as DAC. The DAC1 has jitter-reducing circuits. I am not using the DEC2496 to boost the bass. I have a REL Storm sub, which provides all the bass energy I need.
I am currios now, why the original question? Do you feel like the EQ is completely transparent in your set up? Can you insert the EQ (digitally), press a bypass button, and not hear the difference compared to no EQ in line at all?What frequencies are you cutting, if you are not boosting any? Do you feel like it changes things for the better or is there an artifact that you don't like?
My question pertains to a comment by Mac in this thread: http://www.audioasylum.com/scripts/t.pl?f=general&m=477388
He states that a digital equalizer like the DEQ2496 introduces exactly the same phase errors as an analog equalizer. I thought that digital equalizers were phase-neutral.
Let's stop calling it 'phase error'. It isn't always bad.If Mac is correct, meaning that the Behringer uses IIR filters (and I think it does, though am not 100% sure), then indeed it shifts phase exactly like the equivalent analog equalizer would do.
Now if you use such a phase-shifting equalizer to compensate for the frequency-amplitude aberrations of another minimum-phase system, then the resultant phase response will be linear.
They key, of course, is 'another minimum-phase system'. Your speaker/room system is likely to be MP in some areas, and not in others (e.g. around loudspeaker crossovers, or particular dominant wall reflections). So in some areas the Behringer might improve resultant phase and in some it won't. But as you said, this pales into insignificance compared to the great improvements brought to the net amplitude-frequency response (if you use the Behringer correctly).
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