Low Amplifier Loads / frequency range


I was under the impression that the lowest speaker
impedances usually occur in the lowest bass, the lowest
frequency region.

But is this true ? Can the amplifier also see low loads
at other higher frequencies too ?

I am building a multi-way (active electronic crossovers
with multiple power amps) speaker system. At first I
thought I needed a high-current-capable amp only for
the bass frequencies, but now I am unsure if only one
high current amp is enough.
noslepums

Showing 1 response by noslepums

Thank you much. I read the reference posted on your
website. It seems to make sense, but I don't have an
Electrical Engineering background and cannot digest
all of it.

It leads me think that I may not be asking the right
question, I'm not sure.

In my 4-way speakers, there will one amplifier directly
connected to one driver. So won't the load that each amp
sees depend only on the signal frequency going to that
individual driver ?

I can tell you only the woofer will be operating near
or at resonance conditions. The other drivers have been
chosen such that they will not be playing near their Fs,
therefore no signal frequency fed to them will cause
resonance (I think).

Without resonance, the 3 upper drivers will not produce
any unduly low impedances for their amps, within the band
of frequency each driver is fed (I think).

Am I OK this far, or am I already off ?

Because if I'm correct, only the woofer amplifier could see
exceptionally low impedance. If I'm wrong, then I must
learn.