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In Reply to: RE: Output Impedance Question??? posted by TimeConstant on February 28, 2014 at 03:57:09
Thanks for the responses so far. I have a much better understanding of what is going on now.
I know which tap I prefer but I still wonder how I could determine/ measure which one is which. Is there a way to measure the tap at the speaker outputs???
Follow Ups:
You can measure with a multimeter. Reading the Ohms scale, the 4 Ohm tap to ground will read slightly lower than the 8 Ohm tap. (not much difference, probably a half Ohm difference).
You can also measure the audio output (AC Volts)at the taps. With no load, inject a constant level input source (a tone or pink noise). Keep the level VERY LOW, around one volt. (you can damage an output transformer by driving it to high levels unloaded). The 8 Ohm tap will be outputing slightly more voltage than the 4 Ohm tap.
Thanks for the tips. I did measure the taps and there was a slight impedance difference just as I was told. I am now 99% sure I know which tap is which.The more I listen though the more I find both taps sound good. But, my favorite did turn out to be the 4 ohm tap with the 4 ohm speaker.
Edits: 02/28/14
Nice report thanks for the update.
Will a true 4 ohm speaker sound louder from the 4 ohm tap or will the 8 ohm tap still sound louder at a lower to moderate volume???
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