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The Behringer DEQ2496 digital auto-equalizer (it also does just about everything else) being a professional audio product is designed to work with balanced lines at higher voltage levels than our consumer preamps supply and amplifiers expect. But after a week of experimenting I found it will work just fine, here in a nutshell is what you have to do to use it with unbalanced line-level consumer audio gear:1. If using the analog output, buy 2 female XLR to female RCA adapters.
2. If using the analog input, but 2 Male XLR to female RCA (or these can't be found a male/male and 2 RCA barrel female/female adapters).
(the adapters will have the proper pins shorted for the unbalanced to balanced conversion. These are cheap adapters - $5 to $10 apiece that do not contain transformers)
For digital input/output either optical or XLR, there is no need to do any level adjustment - it's just numbers coming across the interface.
3. set the MAX switch on the back to +12dbu (OUT position).
4. When using the optical input (for CD, etc) set the Gain/Offset (EQ) under the utility menu to -5.0
5. When using the analog input (for phono or SACD) set the Gain/Offset (EQ) under the utility menu to -2.0
All of the gain settings and input source selections can be stored as a preset in memory for easy switching between sources. I have one memory location named 'CD' and another named 'SACD/PHONO' that contains the complete DEQ2496 state with all settings defined.
important note: I am running the DEQ2496 analog output back into the preamp for volume control (it's in one of the tape loops). Don't run it straight into an amplifier without some sort of volume control (like a preamp) or attenuator!
Doing all this, I get very satisfying results and the analog input comes within 3.7db of fully saturating the A/D converter. I have a SRC2496 on order that I probably didn't really need but I can use it to exactly match the input level and it has a headphone amp which I can use. But doing the above will let you experiment with digital EQ and automatic room correction on both digital and analog sources for $300 (plus adapters and the calibrated mic & cable which would add another $100 or so.)
Edits: 09/01/07 09/01/07Follow Ups:
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