I have a Pioneer VSX-305 receiver. It has one of those large headphone ports. Is this an amplifier? (Sorry if this is a dumb question). If so, how good is it and how do these big receivers compare to ~$200 headphone amps?
They seem to be able to drive my HD 650's adequately well.
Here is a photo for reference.
http://imgur.com/AbttLnq
I'm listening to music played through my phone's headphone jack inputting into the receiver via the red/white inputs.
Heya,
Receivers have amps, just like anything else. They have higher gain values. The posts on the back however meant for speakers have low output impedance, so they match well with headphones (which is different from the headphone jack on the front of the unit, as it's impedance is usually uknown). All you need to attach a headphone to the posts is a cable. Since we're talking about the HD650, it's easy, since you don't have to mod anything to do it. Just get a cable made that has the sennheiser plugs for your headphone, and terminates to 4 banana plugs. Often called "speaker taps." Since your headphone has 300ohm impedance, it will work fine with the receiver. It will compare to a lot of $150~200 headphone amps in general. If it sounds hissy or grainy, it's the gain value, and nothing you can do about it. Many of us use speaker amps to drive headphones. I prefer it actually.
Note, it doesn't matter what the receiver/amp has for 'design spec' for rated matching work loads (impedance). 8ohms for example. Makes no difference. The only time it would matter is if it were a locked output state, which is rare. But just understand, as impedance (work load) goes up, the amp does
less work. As impedance goes down, the amp will do a lot more work which makes more heat and will stress it out more. The point here, is that it is perfectly fine to use a 300ohm headphone off the posts of a receiver or a speaker amp, it will not affect anything. It actually will take less work to drive, than an 8 ohm speaker.
Speaker taps, on a custom cable I had made for my HE500.
Here we are hooked into an AVR, the Pioneer VSX1121. Sounded great.
Here, plugged into a speaker amp (Emotiva Mini-X A-100) via speaker taps.
I had my cable made by Brian at BTG Audio. Google him, he'll set you up for a good price for the cable (since you do not need to mod anything, it's just the cost of a cable).
Alternatively you can find someone who can make a cable for you on the cheap maybe.
Very best,