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In Reply to: RE: Grado SR80e posted by neolith on May 22, 2017 at 07:30:28
I don't see the callout for headphone output impedance anywhere. Has anyone measured it?
100 ohm on the single ended, for sure, and 470 per leg of the balanced.
My DACMagic+ will be tested here shortly. That may have lower output impedance to match the Grados.
Too much is never enough
Follow Ups:
A phone call to Parasound may get you an answer. I just looked up the output impedance on the DACMagic+ - 50 ohms. Again, not ideal for the Grado's.
You might want to look into a headphone amp with a low output impedance ( <3 ohms). FWIW, I am using a Objective O2 with the Grado SR60 and the Hifiman HE-400s (22 ohm) with great results. It has an output impedance of 0.54 ohms. It costs about $150 with rear RCA inputs and rear power input option (highly recommended options).
I married the perfect woman. The downside is everything that goes wrong is my fault.
I could ALWAYS hook 'em up to the output of my power amp.
Maybe use a 10ohm or so, 1 watt resistor?
Emotiva does something similar with one of their power amps with a coupled headphone output.
The fans of EMO enjoy that feature and some even have some $$$ phones.
Does Bottlehead make an inexpensive kit? How about some kind of opamp based headphone amp?
I have a CMOY I use for iPod duties.
Too much is never enough
The Grado SA-1 is just a no frills Cmoy with a real nice wood box. I used one with great success with the SR-60. Give it a try. I have no prejudice against opamps. The Objective O2 is opamp based as is the Schiit Audio Magni-2 ($99, output Z = 0.2 ohms). I don't know about the Bottlehead amps but as a rule tube amps are going to have much higher output Z than opamps.
I married the perfect woman. The downside is everything that goes wrong is my fault.
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