I just picked up the 2005 remasters of the Jefferson Airplane LPs, (finally replacements for my well worn 30 year old vinyl) and run through DPLII the rear channels are quite alive on albums like After Bathing At Baxter's and Crown of Creation. A bit of the "triangular effect" that Quadzilla has referred to, (I have my own non-technical, subjective theory behind that, but I've found 1967-69 era stuff just seems to "QS" better than recordings made after that.....) but some of the percussive effects seem to almost be exclusive to the rear speakers. Anyways, has anyone experimented recently (like since 1971....) with wiring the passive Hafler circuit between their speakers and what LPs did you A/B with it for comparison? What was the overall effect in terms of discrete back channel signals? I recall a recent discussion of Hafler wiring in regard to the early EV units on here and some links, but I don't think anyone actually mentioned specific examples that they have tried. Before I start splitting speaker wires for a hoot I thought I would elicit some of your experiences. Might not be worth the 15 minutes of effort required??? John S.