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In Reply to: RE: Output impedance of a DAC to input impedance of Power amp?????? posted by Caucasian Blackplate on August 10, 2014 at 22:08:14
Hi Caucasian Blackplate (P)
Thanks for the information. The passive has 2 resistors in the path at any one time. so is probably the same output impedance at all times. The input impedance will go up as minus attenuation is used (turning the volume pot down).
Here is the unit I bought (stereo RCA with input selector):
http://www.khozmo.com/
Live long and listen!
Follow Ups:
The Khozmo will be constant input impedance.Edit - it's a fixed series resistor and variable shunt, so it's neither.
Edits: 08/11/14
With a shunt attenuator wouldn't the input impedance be Rx + (Ry//input impedance of destination) and change with every click?It would never be lower than Rx. Is that what's meant by "constant input impedance"?
To me the biggest concern is the output impedance.
With a 10k Rx, at -6db the output impedance of the attenuator is 2.5k (assuming an infinite destination impedance and zero source impedance).
Am I missing something?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 08/11/14
Yeah, I looked at all the Dale resistors on that attenuator and thought it was a conventional stepped attenuator, but now I see the fancy single series resistors.
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