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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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DonP
post Dec 29 2010, 15:12
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QUOTE (BearcatSandor @ Nov 1 2010, 21:23) *
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?



Even without the suggested switching devices, consider that a call for blind testing has often been in response to "day vs night" claims sometimes observed between system components in different buildings on different days. IF the amps in question have such glaring differences, they should still be very obvious when tested in the same room a few minutes apart, and no need for repeated switching in the same trial. That makes things a lot easier.
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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
||- - amirm   QUOTE (BearcatSandor @ Nov 1 2010, 22:44)...   Nov 29 2014, 18:59
||- - Arnold B. Krueger   QUOTE (amirm @ Nov 29 2014, 12:59) QUOTE ...   Nov 30 2014, 10:39
||- - amirm   QUOTE (Arnold B. Krueger @ Nov 30 2014, 01...   Nov 30 2014, 18:08
||- - Arnold B. Krueger   QUOTE (amirm @ Nov 30 2014, 12:08) QUOTE ...   Dec 1 2014, 13:03
|- - 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
|- - Arnold B. Krueger   QUOTE (LocrianGroove @ Dec 29 2010, 19:11...   Nov 29 2014, 18:36
- - amirm   Arny, I thought we were talking about listening te...   Dec 2 2014, 16:50
- - Arnold B. Krueger   QUOTE (amirm @ Dec 2 2014, 10:50) Arny, I...   Dec 3 2014, 15:50
- - amirm   QUOTE (Arnold B. Krueger @ Dec 3 2014, 06...   Dec 3 2014, 15:59
- - Arnold B. Krueger   QUOTE (amirm @ Dec 3 2014, 09:59) QUOTE (...   Dec 3 2014, 21:10


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