Onkyo TX-SR602 & Seperate Equalizer??
 

I've been out of the Audio scene for about ten years, so forgive me if this is a stupid question.
I have an old system which is nothing more than Dolby Pro-Logic.
I have just upgraded and purchased the Onkyo TX-SR602 receiver.
With my old system, I have an equalizer installed in the tape loop and it works great so I'd like to still use my equalizer with the new Onkyo.
Since the Onkyo is a digital receiver and the equalizer would only be attached (I assume) through the red and white RCA cords, would I lose digital (DTS) sound?? What is the best way to hook-up the EQ??
Is this possible, or is it pretty much no longer necessary??
Any help would be greatly appreciated.

It's probably time to retire the EQ. It's a 2-channel analog unit that has no real application in a 6-channel digital system. There's no way to connect it for use with multichannel digital surround sound, and even if you could it's not usually productive to change settings that can adversely affect localization/imaging cues.

You could connect the unit between an analog stereo source (cassette or VCR, say) and the receiver, or you could use it with a separate stereo amp with the "zone B" speakers, if you're using such a setup.

While some multichannel systems incorporate a certain amount of control over EQ curves, the sort of complex hands-on analog control represented by 10-band stereo equalizers and the like is uncommon these days, except in the realm of bass equalization. If your unit includes 1/3-octave controls for the sub-80Hz octaves, it's conceivable you could get some use out of it by connecting it between the receiver and the subwoofer, but it would take a lot of measurement and tweaking to make this effective.

If your speakers are deficient in some way that EQ seems to improve, you might be surprised by how good relatively inexpensive modern speakers sound.

RichC