I'm looking to get a test rig set up where I can do ABX testing of various devices from line level in, to amplifier and (less important) speakers.
My more immediate need is for DSP/DAC and also amplifier comparisons. I notice some differences between two similar pieces of equipment and the logical side of me knows that it can't be *real*. I'd like to prove it to myself with double blind testing. And then work toward generating data in cases where there may be real audible differences (another topic that requires more money than I have at this time).
Google has provided me with a few options:
I have also found a few threads by members here with their own DIY ABX projects but I never see any for sale and, to be honest, I'm not up to the task of building one myself... I'm doing well to solder wire together with my shaky hands.
I realize I haven't provided any specifics at this point but that is due to me not really knowing what my options are. I'd like a remote, automated level matching would be an added bonus but not necessary, and maybe some way of capturing the results automatically to keep me from having to break my session to write something down.
What I'm looking for here is suggestions on other options, or someone with an ABX comparator they want to sell (either DIY or manufactured).
Any help is appreciated.
My more immediate need is for DSP/DAC and also amplifier comparisons. I notice some differences between two similar pieces of equipment and the logical side of me knows that it can't be *real*. I'd like to prove it to myself with double blind testing. And then work toward generating data in cases where there may be real audible differences (another topic that requires more money than I have at this time).
Google has provided me with a few options:
- AVA ABX Comparator (more than I can afford, pal)
- QSC ABX Comparator (no longer made; unobtanium)
- Record the audio of the various devices via soundcard and then use foobar or the like to do an ABX on the two different audio files (seems like this may be the most likely route for the time being but will be limited by the soundcard's specs)
I have also found a few threads by members here with their own DIY ABX projects but I never see any for sale and, to be honest, I'm not up to the task of building one myself... I'm doing well to solder wire together with my shaky hands.
I realize I haven't provided any specifics at this point but that is due to me not really knowing what my options are. I'd like a remote, automated level matching would be an added bonus but not necessary, and maybe some way of capturing the results automatically to keep me from having to break my session to write something down.
What I'm looking for here is suggestions on other options, or someone with an ABX comparator they want to sell (either DIY or manufactured).
Any help is appreciated.
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Building a decent double-blind tester is not as simple as it appears - the clicking of relays is not blind at all and must be either be fully sound-proofed, or dummy relays switched so that the same sounds are made on every reconfiguration.
You also need to ensure accurate level matching between A and B, which means being able to measure the difference in level and correct it. Measurement is not easy for music sources unless you use test tones embedded in the source material for this purpose. Probably easiest to get this working well in the digitial domain anyway, with the right software.
You can't blind ABX test speakers anyway, because speakers have to be non-overlapping in space. Short of silent speaker-swapping robots behind a curtain, you can't really do this.
You also need to ensure accurate level matching between A and B, which means being able to measure the difference in level and correct it. Measurement is not easy for music sources unless you use test tones embedded in the source material for this purpose. Probably easiest to get this working well in the digitial domain anyway, with the right software.
You can't blind ABX test speakers anyway, because speakers have to be non-overlapping in space. Short of silent speaker-swapping robots behind a curtain, you can't really do this.
The clicking audibility mainly depends on loudness, music type and switching time. I use dummy relays and short switching times.
Accurate level matching is the most important thing when comparing two amplifiers.
My box requires external sine generator, e.g. software on notebook (which also functioning as log capture). MCU measures Vp and displays it. I usually calibrate for 10Vp/4R.
the box AB-BOX : The ABX Comparator - Google Photos
Accurate level matching is the most important thing when comparing two amplifiers.
My box requires external sine generator, e.g. software on notebook (which also functioning as log capture). MCU measures Vp and displays it. I usually calibrate for 10Vp/4R.
the box AB-BOX : The ABX Comparator - Google Photos
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AB / ABX switcher
Very nice job. I have completed some basic switchers for multiple headphone connection, nothing like your box. I have a habit of picking up an amp every year and like to compare the last years amp. I just do basic listening test to see which I want to keep. Would be so much easier if there was at least an AB box, Would very much like to understand more about your design as well as establish a dialogue with someone with actual experience. Thanks
Very nice job. I have completed some basic switchers for multiple headphone connection, nothing like your box. I have a habit of picking up an amp every year and like to compare the last years amp. I just do basic listening test to see which I want to keep. Would be so much easier if there was at least an AB box, Would very much like to understand more about your design as well as establish a dialogue with someone with actual experience. Thanks
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