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Old 11th June 2012, 01:37 PM   #1
diyAudio Member
Join Date: Jan 2012
Default measuring t/s : test problem(s) help/diagnosis

i'm using current source method.

i've measured both drivers having an Re of 7.6 ohms.
my test resistor has a resistance of 10.3 ohms rated @ 10.

the problems start when i try and get a steady output from the amplifier to the driver to start measuring. i've tried 3 amps and none seem to be able to hold a steady voltage at any given frequency.

amps tried, 2x sure electronics tripath's and 1 sony thing.

i've tested the output voltage on the power supply for the sure amps and its a rock steady 24v.

what am i doing wrong? is my signal generator (sound card) to blame for not hold a steady tone, or am i doing something ridiculously stupid?

soundcard is a creative X-fi platinum, I have some on board realtek i could also try should this be considered the problem. the tone was produced via a program called audacity, could this be the problem?

and yes i know the drivers aren't hooked up to the circuit.

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