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Old 16th November 2007, 05:55 AM   #1
Basalt is offline Basalt  Australia
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Default Using a headphone amp as a pre-amp?

Anyone here have any experience using a headphone amp as a preamp? Good idea/bad idea? Anything to watch out for (too much gain, impedance matching...??)
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Old 16th November 2007, 10:24 AM   #2
SamL is offline SamL  New Zealand
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AMB's M3 and B22 headphone amp can be used as preamp as well as small speaker amp. The B22 is very well received and is rated highly as headphone amp. Not sure how it will fatch as preamp.
AMB has a very good build details on his site http://www.amb.org/audio/ and you should find most of the answer there. If not, you can reach him over the headwize forum.
http://headwize.com/ubb/forumdisplay.php?fnum=3


Have fun,
Sam
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Old 16th November 2007, 10:44 AM   #3
Gordy is offline Gordy  United Kingdom
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Default Re: Using a headphone amp as a pre-amp?

Quote:
Originally posted by Basalt
Anyone here have any experience using a headphone amp as a preamp? Good idea/bad idea? Anything to watch out for (too much gain, impedance matching...??)
In essence a headphone amp is a preamp with a slightly beefed-up power supply and output stage.

With the vast majority of headphone amps they should work perfectly well as preamps. However two provisos...
1) Some have a silly amount of gain and hence you might not have much usable volume control range.
2) Conventionally wired headphone amps share the output negative connection between left and right channels, and as such the maximum channel separation can sometimes be limited. In reality you may not notice this.
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Old 16th November 2007, 12:29 PM   #4
Nordic is offline Nordic  South Africa
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I'd say 80% of commercial equipment shares ground....
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Old 19th November 2007, 10:55 AM   #5
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yes, i have built a few pre-amps and the M3 is still the one to beat overall.
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