Doug Schroeder Method, Double ic

Hello everyone.  Tried the basic Schroeder method 3 weeks ago but did not post then because I am the skeptics skeptic.  I removed and replaced the cables 3 times because I disbelieved my own ears.  I finally invited 3 audiophile friends and did a "blind" test.  They were shocked to put it mildly.  All three have read this thread as Grannyring surmised and all three doubled up on ICs to pre amp.  Since I am bi amping Hi's and Lows thru a Marchand crossover I am trying to solve the mechanics of doing a "Schroeder" to each amp.  Thanks Doug--such a vast improvement to an old school system.  PS.  I am using a TBI sub amp that is class D but only running that off a pre amp with a single rca.

After several weeks of listening to SM double ICs from cdp to pre amp I have replaced the Kimber KCAG with 2 sets of Mark Levinson Red Rose silver custom ICs.  I like pure Litz construction especially using the Schroeder concept--new wire has many strands of pure silver Litz.  Very, very positive initial  results over the Kimber.  Will age for a week or two--let this board know after.  Oh, blew my power supply in my Marchand crossover so SM can be extended rather directly to amps.  I am a 15 foot pair short so I will let you know.