Hafler DH-110 better than receiver preamp???

The Hafler was a decent piece in it's time, but that was a long time ago. Generally speaking seperates do sound better, not necessarily because they are seperate, but because the designers put more effort into them than into a receiver.
I don't know how good your integra is, but a decent amp and pre-amp better sound better than what you have. It might be fun to experiment since you got the Hafler cheap!

Woo hoo! That's what I'm thinking!

The DH 110 is a good preamp and should be better as is.

I had a dh110/220(power amp) and also a pioneer elite vsx26 surround sound reciever. WHen compaired the hafler combo was cleaner with more mid responce and base punch a much better 2 channel system.