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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: I almost got it... posted by hZ on May 6, 1999 at 19:50:40:
>>>Doesn't back-EMF occur in single drivers? Why would it be a problem only with series drivers?Because with one driver the coil sees only the amp, which by its very low impedance effectively damps the energy from EMF. But the second driver will have to conduct the current related to that phenomenon - read: DISTORTIONS.
>>>I understand that an amp's output maximum will only double for a 4 ohm load compared to an 8 ohm for the best of amps, but at lower volumes (1 volt, for example), why would an amp's current not double for half the impedance?
Because the output impedance of an amp is not infinitely small - it is in fact quite real.
For example, if the amp has 1 ohm output "Z" and speakers are 8 ohm, with 9 volts at the output taps 8 V will be available at the speaker terminal and 1 V loss at the amp. Current will be 1 amp.With say 2 Ohm speakers, ( volts will be divided like 1:2 = 3 V at the amp, 6 V at the load. Current will be 3 A.
So you have 4,5 times decrease of speaker impedance but only 3 times the current increase. And that is REGARDLESS of the power being used.
Do not forget that the whole amp ALWAYS runs at full throttle, only the input voltage is adjustable by pot or external preamp.Hope this helps,
Lukasz
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Follow Ups
- Re: I almost got it... - Lukasz F 01:29:07 05/07/99 (1)
- thanks .nt. - hZ 23:20:53 05/07/99 (0)
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