Originally Posted by arnyk
You are about half way to ABX. I' agree that you eliminated some but far from all of the confusing influences that completely trash most audiophile A/B comparisons.
You provided quick switching of level-matched alternatives (can't really tell how close the levels were matched) at the listener's discretion which is all good and which almost nobody does. Hearty and sincere congratulations!
Sighted bias was still part of the evaluation. If someone wants to argue that you were unknowingly biased towards the "no differences" conclusion, its hard to argue against that.
My next shot at ABX will be based on some fairly simple software and this device:
Basically your little program outputs one character via a USB port that controls the open/close status of all 8 relays. No sweating someone inadvertently paralleling any of the amps! $35 out of pocket - arguably cheaper than your 8 light switches.
Thanks Arny. Yeah, I have to say it was a bit stressful switching back and forth. I never made a mistake but a friend of mine did and he smoked one of the 2 little T amps we had in no time flat. Still, I'm very impressed with avs member Archaea with whipping that switcher up in basically no time flat and it worked great.
For me personally I had enough that second day for my curiosity to be satisfied. I know it wasn't a completely perfect non-biased type of setup, but the fact that we didn't know which amp was which, all amps level matched within .2 decibels etc. was enough for me. Honestly for me it was pretty obvious from the get go that second day that we weren't going to be able to tell a difference between any of the amps. (except for one which ended up being the HTIB receiver).
Even if there are small differences which I was unable to hear, they would be minuscule compared to the differences in speakers and rooms so that's what my focus will be. In my experience the biggest variable is the speakers. This is in MY room. In other rooms maybe the room is the biggest factor, but for me it's the speakers. I have 4 tri trap bass traps and 4 large acoustic panels and while they do make a difference and I love having them they do not compare to a change in speakers (once again, in MY room).
Still, I like the treatements enough to plan on more. I plan on buying 3 more 242 GIK panels for a cloud on the ceiling and then I think I'll be done with treatments.
Like I said before, I am a bit bummed that I couldn't tell a difference in amps, I was planning on getting one for the speakers. I probably still will eventually but it's hard to justify spending the money right now since their sensitivity is 101 and I am 9 feet away from the mains and center. If my math is right I need 1 watt to get roughly 92 watts at my LP, so I get 104 db's (basically reference peaks, 1 db short) with 16 watts.
Ok, got off topic a bit with this post... I tend to do that.