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NAD Receiver beats LD MKIVse?? - Page 13

post #181 of 191
9/17/08 at 8:20am
But you don't need lot of power to drive 64 ohm cans?
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post #182 of 191
9/17/08 at 8:53am
Power requirement has little to do with impedance.
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post #183 of 191
9/17/08 at 8:55am
Oh, I see what you mean - like with power amps, difficult and low impedance speakers need very powerful and stable power amps to drive them. Mostly class-A power amps and not tube amps... probably the same applies to cans?!
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post #184 of 191
9/17/08 at 9:19am
Yep, exactly. Low impedance and low sensitivity headphone demands the most current.

It's like saying an 8 ohms speaker is harder to drive than a 4 ohms one, or vice versa. Either way, we can't make generalisation like that.
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post #185 of 191
9/17/08 at 9:44am
Quote:
Mostly class-A power amps and not tube amps...
Class A has nothing to do with being tube or ss. There're both tube and SS amps working in class A.
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post #186 of 191
9/17/08 at 10:01am
Quote:
Originally Posted by QQQ View Post
Class A has nothing to do with being tube or ss. There're both tube and SS amps working in class A.
You cought me on that :-) I know, but you don't have 60 pound mono amps running 30 FETs in class A and outputing 300w in pure class A with tubes :-)
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post #187 of 191
9/20/08 at 6:32am
No council for the Hd-650?
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post #188 of 191
9/20/08 at 8:21am
Quote:
Originally Posted by dario View Post
No council for the Hd-650?
Receivers and integrateds that sound good should sound good with the HD650. The overwhelming majority use resistors to step down the ouput of the main speaker amps and the only real caveat to that methodology is high output impedance, which can have an audible effect on the FR of low impedance phones, but usually doesn't effect high-impedance phones like the 650. Good bets should be recent products from NAD, Marantz, Rotel, Cambridge Audio, Yamaha...the better stuff. Another really good route is 70s vintage. All of that stuff -- Harman Kardon, Marantz, Pioneer, Kenwood, etc, was very solidly built with the kind of power you need to drive your 650s with authority. Any of them that sound good with speakers should sound good with your phones. I get great results from a 70s Harman Kardon integrated and HD 580s. I've compared it to dedicated HP amps and it's still in my system.

Tim
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post #189 of 191
9/20/08 at 8:38am
I understand your advice, but I need also council about (good price used) models for search on ebay and similar...
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post #190 of 191
9/20/08 at 8:45am
Quote:
Originally Posted by dario View Post
I understand your advice, but I need also council about (good price used) models for search on ebay and similar...
Well, I use a Harmon Kardon A-402, but they're rare and come from the early 70s. I'm not sure I would recommend buying one and having it shipped to Europe as cost-effective. Here's a great place to start. It's a long thread, but I'm sure there are some specific models mentioned in there. In Europe, I'd look for NADs and Cambridge Audios.

http://www.head-fi.org/forums/f5/man...-jacks-338299/

Tim
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post #191 of 191
9/20/08 at 10:01am
Ok, thanks I will see in the linked thread
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