TonyP
Guest
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 Posted:
Tue Nov 30, 2004 6:22 am Post subject:
Re: Dedicated headphone amp ? |
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"Arny Krueger" <arnyk@hotpop.com> wrote in message
news:xOudnaufNf1yizbcRVn-og@comcast.com...
| Quote: | You cannot drive 600
ohm headphones with a 48V voltage source without clipping.
Of course, everything with a voltage limit can be abused to the point of
clipping. However, are there really headphones that require what, 18 volts
rms to achieve reasonble volume levels?
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Probably more like 15V RMS, but still over 1/3W @ 600 ohms. That's pretty
inefficient headphones! Even AKG's get by with less than that.
Passive near field monitors maybe :-)
TonyP.
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Arny Krueger
Guest
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| Posted:
Tue Nov 30, 2004 6:07 pm Post subject:
Re: Dedicated headphone amp ? |
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"TonyP" <TonyP@optus.net.com.au> wrote in message
news:41abf782$0$8114$afc38c87@news.optusnet.com.au
| Quote: | "Arny Krueger" <arnyk@hotpop.com> wrote in message
news:xOudnaufNf1yizbcRVn-og@comcast.com...
You cannot drive 600
ohm headphones with a 48V voltage source without clipping.
Of course, everything with a voltage limit can be abused to the
point of clipping. However, are there really headphones that require
what, 18 volts rms to achieve reasonble volume levels?
Probably more like 15V RMS, but still over 1/3W @ 600 ohms. That's
pretty inefficient headphones! Even AKG's get by with less than that.
Passive near field monitors maybe :-
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Here's a wild idea:
Drive the common side of the headphone jack with -0.5*(L+R).
Drive the L terminal with L-0.5*R
Drive the R terminal with R-0.5*L
The L headphone element gets 1.5*L while playing the left channel source.
The R headphone element gets 1.5*R while playing the right channel source.
Op amps that can run on +/-24 volts develop headphone output comparable to
op amps running on +/- 36. Seems like 15-20 VRMS or more is a slam dunk!
Yeah, things can get a little strange if you play mono... |
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