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How do you reliably ABX equipment that needs to be disconnected, and how can TOS #8 be satisfied in such situations?
BearcatSandor
post Nov 2 2010, 03:23
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(I was not sure where to put this. My emphasis is really on the testing methodology, not TOS #8 so i decided this would be the best area to put it in)

I'm still new here and trying to learn about proper ABXing and how to avoid the threat of a dreaded TOS 8 hammer (unsuccessfully it seems). I was asked about whether i had done an ABX test between 2 amplifiers. That got me thinking about how one would be able to do that in the first place in their own home.

Suppose i am ABXing a similar amplifier against the one i already have. My system is: Sound card ---> interconnects ---> amplifier (2 channel/1 input) ---> speaker cable ----> speakers
New amp would be the same: Soundcard ---> interconnects ---> amplifier (2 channel/1 input) ---> speaker cable ----> speakers
(a third one is needed? How does that work with hardware?)

To switch between the amps my assistant would need to move the interconnects back and forth between amps and the sound card outputs. That involves making sure that the amp 1 is shut down, removing the cables from amp 1 and plugging them into amp 2 and turning on amp 2. There would be significant lag in doing so, wouldn't there? The same problem would be there for cable ABXing as well.

Doesn't lag play a part in the accuracy of these tests?

How do you folks satisfy an ABX request in such a situation? Do you commonly have some sort of switching device in your home? How would i provide a sample for the community as outlined in TOS #8 (making it unsatisfiable)? Provide duplicates of the system used?

I looked around the site for information on how to ABX components but what i found seemed to relate to sound files and not hardware.

Could you folks help me understand this?

Thanks


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Music lover and recovering high end audiophile
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LocrianGroove
post Dec 29 2010, 05:57
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I'd like to propose an ABX test method, so that when I present results, my results will be taken seriously. My goal is to ABX a laptop soundcard and an iPod with IEM's.

1) I would have someone assist in switching connections while I'm out of the listening room, using a randomized sequence, 8 X's long. That person would leave the listening room between listening passes. I would get to listen to A and B as many times as I need to, just as in a software ABX test.

2) I would let each device play back a looped segment for the duration of the test, so we can press play on each of the players just once. The players won't be looping, but rather the files played back will consist of loops.

3) I would achieve level matching by choosing a reasonable listening level, then recording the output of each device and adjusting the outputs until I could make a recording of each device playing the same segment with the same RG value to within 0.5 dB.

Would the results of such a test be taken seriously? If not, what else might I try?
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Posts in this topic
- BearcatSandor   How do you reliably ABX equipment that needs to be disconnected   Nov 2 2010, 03:23
- - kiit   TOS 8 is usually mentioned when someone has stated...   Nov 2 2010, 04:12
|- - greynol   QUOTE (kiit @ Nov 1 2010, 20:12) you don...   Nov 2 2010, 09:24
- - saratoga   Get a really good ADC and record both outputs, the...   Nov 2 2010, 04:22
|- - BearcatSandor   QUOTE (saratoga @ Nov 1 2010, 21:22) Get ...   Nov 2 2010, 05:15
|- - BearcatSandor   QUOTE (saratoga @ Nov 1 2010, 21:22) Get ...   Nov 2 2010, 07:44
||- - saratoga   QUOTE (BearcatSandor @ Nov 2 2010, 02:44)...   Nov 2 2010, 16:39
||- - BearcatSandor   QUOTE (saratoga @ Nov 2 2010, 09:39) QUOT...   Nov 3 2010, 01:46
|- - greynol   QUOTE (saratoga @ Nov 1 2010, 20:22) Get ...   Nov 2 2010, 09:54
|- - Arnold B. Krueger   QUOTE (greynol @ Nov 2 2010, 04:54) QUOTE...   Nov 2 2010, 14:29
- - analog scott   QUOTE (BearcatSandor @ Nov 2 2010, 04:23)...   Nov 2 2010, 04:54
|- - BearcatSandor   QUOTE (analog scott @ Nov 1 2010, 21:54) ...   Nov 2 2010, 06:27
- - analog scott   QUOTE (BearcatSandor @ Nov 2 2010, 07:27)...   Nov 2 2010, 06:33
|- - krabapple   QUOTE (analog scott @ Nov 2 2010, 01:33) ...   Nov 2 2010, 07:26
- - Arnold B. Krueger   QUOTE (BearcatSandor @ Nov 1 2010, 22:23)...   Nov 2 2010, 14:21
|- - pbelkner   QUOTE (Arnold B. Krueger @ Nov 2 2010, 15...   Nov 2 2010, 14:30
|- - Arnold B. Krueger   QUOTE (pbelkner @ Nov 2 2010, 09:30) QUOT...   Nov 2 2010, 16:17
- - LocrianGroove   I'd like to propose an ABX test method, so tha...   Dec 29 2010, 05:57
|- - saratoga   QUOTE (LocrianGroove @ Dec 28 2010, 23:57...   Dec 29 2010, 06:21
||- - knutinh   QUOTE (saratoga @ Dec 29 2010, 06:21) Tha...   Dec 29 2010, 14:45
|||- - Arnold B. Krueger   QUOTE (knutinh @ Dec 29 2010, 08:45) QUOT...   Feb 6 2011, 14:06
||- - LocrianGroove   QUOTE (saratoga @ Dec 29 2010, 00:21) Ass...   Dec 30 2010, 05:51
|- - DonP   QUOTE (LocrianGroove @ Dec 28 2010, 23:57...   Dec 29 2010, 14:58
- - MerlinWerks   QUOTE (BearcatSandor @ Nov 1 2010, 22:23)...   Dec 29 2010, 14:56
- - DonP   QUOTE (BearcatSandor @ Nov 1 2010, 21:23)...   Dec 29 2010, 15:12
- - LocrianGroove   I think 0.1 dB accuracy would be hard to attain by...   Dec 30 2010, 01:11


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