Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics.

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eliminating low frequenies impact on ohm/load handling of amp?

Posted by Phil0618 (A) on August 16, 2004 at 08:50:21

Also posted on the amplifier forum...

Hi,
I know that it is considered unwise to run too many pairs of speakers off of an amp since wiring multiple pairs in parallel will drop the Ohms/Load and tax the amp.

However, what if I am running multiple pairs, but I'm filtering the bass via an active crossover and the amp in question is not required to handle the low frequencies? Will this tax the amp less? Will it tax it less enough so that I can run 3 8 ohm pairs? 4?

The reason I ask is as follows. I'm assembling an outdoor stereo using multiple pairs of speakers throughout my backyard. I'm contemplating running a NHT SA2 amp/crossover to actively filter the low level signal prior to sending the signal to the amp powering the upper frequencies. The outdoor stereo would have a couple of subs handling the low frequencies and perhaps 4 pairs of 8 0hm speakers handling everything above 100 Hz. For the mids/highs I"m currently running an Adcom GFA 535 which is a decent amp but only rated at about 60 watts per channel into 8 ohms.

Worst case I add another amplifier or some sort of speaker switching device that compensates for load, but I thought I'd ask my fellow inmates since I'm curious about the answer...

Thanks for the help.

Phil

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