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are High Watts Output Amps really necessary? - Page 2

post #16 of 17
Quote:
Originally Posted by Hooster View Post

Thx Chris. The impedance of any decent speaker cable is minimal compared to the impedance of a speaker
http://en.wikipedia.org/wiki/Speaker_wire

The impedance associated with the crossover is included in a speakers impedance rating and the contacts should not generate significant impedance. With most speakers, significant variations in impedance do however occur with frequency. A speakers impedance rating is nominal and does not account for that fact that the impedance can vary rather wildly with frequency. It can dip very low at low frequency and this may cause problems, typically bloated bass or clipping if you push harder, if your amp is not capable of producing enough current.

http://forum.blu-ray.com/showthread.php?t=71469
http://en.wikipedia.org/wiki/Electrical_characteristics_of_dynamic_loudspeakers

The point is, ideally, the amp drives the load, which is actually the loudspeaker driver itself.
Crossover, speaker cables, contact resistance, etc are really just losses which reduce the effective damping factor applied to the drivers.
post #17 of 17
Quote:
Originally Posted by Chris J View Post

The point is, ideally, the amp drives the load, which is actually the loudspeaker driver itself.
Crossover, speaker cables, contact resistance, etc are really just losses which reduce the effective damping factor applied to the drivers.

 

The resistance of the voice coil itself needs to be added, too, but that cannot be changed without replacing the driver. So, a change from a damping factor of 30 to 300 does not improve electrical damping by 10 times, but more like by 3 % only, which is obviously less impressive from a marketing point of view, but is better than nothing. It also depends on the driver how strong the damping effect is in the best case (0 source impedance).

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