High Impedance Speakers

bjackson · 3rd January 2006, 06:39 AM

Why are there no high impedance loudspeakers?

I am into headphones a lot (college student with a small apartment), and I've always used low impedance headphones, i.e. 32 ohm Grados or 24 ohm Shure or 64ohm AKG, etc.

But I just bought some Sennhesier 650's which are 300ohms. They sound excellent, but what I love is that no matter what I plug them into I can't hear hiss or anything from them. If I plug in my 24 ohm in ear monitors which are 102db/mw efficent there is some serious hiss out of a lot of sources.

The only thing I could think of is that some really big inductors would be needed, and higher voltage amplifiers, although the VA rating would remain the same.

What are your thoughts?

moamps · 3rd January 2006, 08:31 AM

Maybe the right answer is in different headphones efficiency, not in the different impedance.

bjackson · 3rd January 2006, 04:13 PM

I wouldn't think so, both of my headphones my 300ohm Sennheiser and my 32ohm Grado are around the same efficency of 90db/mw, however my Sennheisers can not be played out of an ipod, etc, because they don't produce enough voltage (maybe get 75db), but my Grados can get 105+db out of an ipod.

3rd January 2006, 06:39 AM	#1
bjackson diyAudio Member Join Date: Dec 2004 Location: Illinois	High Impedance Speakers Why are there no high impedance loudspeakers? I am into headphones a lot (college student with a small apartment), and I've always used low impedance headphones, i.e. 32 ohm Grados or 24 ohm Shure or 64ohm AKG, etc. But I just bought some Sennhesier 650's which are 300ohms. They sound excellent, but what I love is that no matter what I plug them into I can't hear hiss or anything from them. If I plug in my 24 ohm in ear monitors which are 102db/mw efficent there is some serious hiss out of a lot of sources. The only thing I could think of is that some really big inductors would be needed, and higher voltage amplifiers, although the VA rating would remain the same. What are your thoughts?

3rd January 2006, 08:31 AM	#2
moamps diyAudio Member Join Date: Oct 2002 Location: Croatia	Re: High Impedance Speakers Maybe the right answer is in different headphones efficiency, not in the different impedance.

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3rd January 2006, 04:13 PM	#3
bjackson diyAudio Member Join Date: Dec 2004 Location: Illinois	I wouldn't think so, both of my headphones my 300ohm Sennheiser and my 32ohm Grado are around the same efficency of 90db/mw, however my Sennheisers can not be played out of an ipod, etc, because they don't produce enough voltage (maybe get 75db), but my Grados can get 105+db out of an ipod.

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