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ATTN: Grado RA1 Owners - Page 3

post #31 of 33
1/5/04 at 2:46am

It's the Cans, Stupid :-P

My Etmotics ER-4p canalphones hum when connected to the RA-1, but the ER-4s version (higher impendance) is completely DEAD SILENT. Cranking the RA-1 volume knob all the way up doesn't increase the hum at all, by the way. Thus, it's the phones that are humming, not the amp.
I know almost nothing about electronics, but I can do empirical trials to beat the band.
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Gear mentioned in this thread:

Grado Reference RS2 Headphones
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Grado RA1 - Headphone amplifier
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Grado RA1-HG
post #32 of 33
1/5/04 at 4:09am
Dead silent for me.
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post #33 of 33
9/27/11 at 10:23am


Just means there's a base hum that doesn't change with volume.  That's still the amp's fault.  The ER4S can be quiet on a great many noisy amps due to their sensitivity and impedance.  They're not as insensitive as some beyers and senns, but they are more so than the P model.
 

Quote:
Originally Posted by katfisch View Post

My Etmotics ER-4p canalphones hum when connected to the RA-1, but the ER-4s version (higher impendance) is completely DEAD SILENT. Cranking the RA-1 volume knob all the way up doesn't increase the hum at all, by the way. Thus, it's the phones that are humming, not the amp.
I know almost nothing about electronics, but I can do empirical trials to beat the band.



Output impedance?  Max input?

 

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Gear mentioned in this thread:

Grado Reference RS2 Headphones
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Grado RA1 - Headphone amplifier
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Grado RA1-HG
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