Whats the best way to measure for voltages in LT? - diyAudio
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Old 26th March 2007, 07:28 PM   #1
mikee55 is offline mikee55  United Kingdom
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Default Whats the best way to measure for voltages in LT?

Hi all, I've made a Linkwitz Transform, and would like to measure the ins and outs of the circuits, to check for overload.
I have taken the signal from my main amp via loudspeaker connection, droped the level using a headphone adapter from an old amp. This goes through my input mixer/ phase switch, 24db lowpass and finaly Transform. I don't have a scope but I do have A.C. millivoltmeters.

Cheers mikee55
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Old 26th March 2007, 08:09 PM   #2
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Default Here is some data

Hope this helps
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Old 28th March 2007, 12:07 AM   #3
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Default Does Nobody measure??

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Old 28th March 2007, 12:20 AM   #4
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For any meaningful measurement you need a scope, there really isn't much you can do without one..
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Old 28th March 2007, 01:41 AM   #5
infinia is offline infinia  United States
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Hi
What you really need is an audio signal generator to test LT functions given you have a reasonable AC millivolt meter for the task. You could also use a computer program such as the RightMark freeware to test the LT circuit.
As I see it you have added close to 19dB of gain in your signal path by inserting the LT circuit. So input levels should be adjusted downward accordingly. You don't have to shoot for 20 Hz. Try a more realistic freg giving the LT circuit 8-10dB max. remember you have room gain to boost LF as well, 20Hz is probably an unrealistic goal here.
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