| Denon AH-D7000 seem defective, but not sure.
I just received today my Denon Headphones AH-D7000. I hook them to my Arcam preamp C31, and there,I get grinching static sound when playing music only. I clean my headphone contact, same thing, static sound. I have another 2 pairs of cans, being sold, a Sennheiser HD650 and a Sony MDR-SA5000, and none of them do that static sound in the same preamp. So I assume it's the Denon which is defective. My Arcam CD player does not have headphone out, but I do have a Tascam CD recorder with headphone out. I switch player input and try the Tascam, same problem. I plug the Denon in Tascam CD player headphone out directly, and, problem is gone, no static. I even plug the Denon in another Yamaha HT AV receiver, and works fine also. So Denon seems to be fine also. Is there a possibility of impedance incompatibility between the Denon and Arcam. Denons are 25 ohms, Sony is 70 ohms, and Senn is 300 ohms. Arcam headphone out has output impedance of 4.7 ohms, and 5v maximum output level in 600 ohms. I'm puzzled, and was not able to do any elimination in the process, and not ready to send back the Denon for replacement as it works fine in other units, but the reason to use it is with my Arcam equipment and SACD Arcam player .Thanks. I would like to add, that my house is old, and not grounded. But I guess that applies to all equipment if anything wrong, and not just Denons.
Last edited by zeiter; 01-04-2009 at 7:19 PM.
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