ABX Switching Box for Phono + Line Preamps

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thermionic

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Joined 2004
Hi,

So as to be sure that no prejudice is being exerted when I conduct listening tests, I’d like to get an ABX box made. If the ABX box is suitable for blind testing - all the better.

The box will be needed to compare Phono Preamps against one another, and Line Preamps against one another.

Does anyone have a schematic they can link to that shows such a device? I reckon I could ‘design’ a pretty good switching box for Line Preamps (using relay switching), but I’m nervous about using the right kind of relays for low-level signal switching.

Google turns up this link:

http://sound.westhost.com/abx-tester.htm



Any suggestions would be gratefully received. Thanks in advance.


Justin
 
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