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Old 18th February 2011, 05:55 PM   #11
gruni is offline gruni  Germany
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Sounds interresting that current feedback is already used in some amps.

The bass top i use is a quite cheap one, but its good enough for me: basskick 707
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Old 3rd December 2011, 01:39 PM   #12
JMFahey is offline JMFahey  Argentina
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Sorry, but that sounds a completely silly idea - the speakers won't be damped correctly, and you're throwing away most of your power.
No, itīs not silly at all ... in a musical instrument amplifier.
1) thatīs the point: the speakers wonīt be damped (or *much* less than before) , which is good.
There will be a bass peak at the resonant frequency: good.
2) thereīs no power wasting at all, because thereīs no physical 8 ohm power resistor in series with the load, but the feedback is so configured for the power amp to *sound* like if it was there.
Well, you will lose *a little* power in the current sensing resistor.
I have made such amps for almost 40 years , almost 10000 of them, and I typically use a 0.1 ohm sampling resistor in series with the 4 ohm speaker load, so in a 100W amp I lose 2.5W.
I can live with that.
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Old 3rd December 2011, 02:44 PM   #13
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If you like one note bass then I would say the peak is good. If you want more bass why not use the bass control?
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Old 3rd December 2011, 05:13 PM   #14
JMFahey is offline JMFahey  Argentina
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Well, in the musical instrument world, the peak is good.
And itīs not "one note" (like those horrible bass systems so popular in Car audio).
The effect is like rising 6dB (which is not *that* much) a single slider in an otherwise flat Graphic EQ.
And, after all, thatīs exactly what classic tube bass amps do (Fender, Ampeg, etc.).
And the audible effect is not at all the same as rising the bass control by 6dB, because the regular tone control works on a very wide band.
Good, but different.
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