Take a look at this one:
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Goes for about $250 street price. Has an auto-calibration system that's super easy and it sounds good. I know cause I have it's older brother. My $1000 HK pre/pro went out . So off to CC I go looking for the least expensive receiver that had pre-outs to use while my HK was getting repaired. I sold it instead - the Pioneer was that good. I've been extremely pleased ever since.
Don't forget that your EQ will only adjust two channels. And if you use the tape monitor loop (called CDR/Tape/MD on the 815-K), you'll get no surround processing. You can use the pre-out feeds from the receiver throught the EQ then to an separate amp.
I don't know what would happen if you ran the (say front) pre-outs through the EQ then back into the receiver via the 5.1 input. Might work?????
Anybody ever try this?