Sometimes you have to take THD measurements in the context of how and
where they're measured. This outstanding little amp is a good example:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-380
10% THD @ 15 watts into 4 ohms
0.1% THD @ 10 watts into 4 ohms
88% efficiency, 102DB dynamic range.
The point is that the THD of any amp skyrockets where it approaches
being over-driven. Some of the amps you see advertised with awful THD
specs sound great when not driven into distortion to get the highest
possible output power ratings...
Back to this little guy, though, it sounds *terrific* at normal room
volume with a pair of decently-efficient speakers, and even some that
aren't all that efficient - like the same company's BR1 kit speakers.
My .02 USD only - adjust for local currency as appropriate
Jim, N7CXI
On 1/29/2012 12:55 PM, Ralph W5JGV wrote:
Also, look at the distortion spec. on these cheapo amps! It's an
awful 10%!
You will hear this and the audio will be fatiguing to listen to.
Why waste
the nice low distortion audio recovery of the Flex on a lousy audio amp?
Agreed! I went to the local thrift store and bought a well used Sony
component stereo amplifier. After changing a few capacitors, it works FB. I
then bought a couple of 8" component system speakers at Radio Shack since
most of the thrift store stuff was either ratty looking or blown out. The
combination makes for pleasant listening when on the local nets on the ham
bands, as well as excellent sound quality on the SW and AM-BC bands. And,
being a stereo amplifier, I can use the second RX in the F5K to listen to
two bands at once, one on each speaker.
73,
Ralph W5JGV - WD2XSH/7
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