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Matching Speakers to Amps

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Matching Speakers to Amps

Postby awdl22125 » Mon Oct 14, 2019 3:06 pm

I have recently purchased a Behringer XR18 and to go with it a second hand KAM KCA 1600 Power Amp. The amp is rated at 2 x 400W RMS @ 4 Ohms & 2 x 250W RMS @ 8 Ohms. My band uses Peavey PA Speakers with tops and subs, the subs are rated at 4 ohms and I think the tops are too. Wouls this be ok in terms of matching?
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Re: Matching Speakers to Amps

Postby Sam Spoons » Mon Oct 14, 2019 3:25 pm

Depending on the power handling of the speakers* and providing you have a crossover (usually built into the sub) then yes you'll be fine. If you just connect the sub and top to one channel without a crossover you risk destroying the amp as the net impedance would be 2 ohms.

* between 200 and 400 watts continuous would be ok.
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Re: Matching Speakers to Amps

Postby awdl22125 » Mon Oct 14, 2019 3:29 pm

Thanks for the reply, the speakers are 250/500 watts so that should be ok. How would I know if the subs have a built in crossover? they are passive not active
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Re: Matching Speakers to Amps

Postby Wonks » Mon Oct 14, 2019 3:34 pm

You could try looking up a spec sheet online for them.
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Re: Matching Speakers to Amps

Postby Sam Spoons » Mon Oct 14, 2019 4:53 pm

Or they'll have a 'link' or 'thru' socket or something appropriately labelled on the back. If they don't you do have a problem to solve. Easiest way might be to buy another used power amp and use the HPF/LPF in the XR18 to match the subs and tops (you'll only need to burn up one extra output as the subs can quite happily be run in mono).
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Re: Matching Speakers to Amps

Postby DanR » Tue Oct 15, 2019 4:28 pm

Sam Spoons wrote:Depending on the power handling of the speakers* and providing you have a crossover (usually built into the sub) then yes you'll be fine.

Yes. I used to run 4 passive cabs from one power amp. Peavey EuroSys with an FBT amp.
The subs had 1/4” jack in and out with built in passive crossover.
With the system in question, it looks like each speaker would get 200W if the subs have a crossover built in.
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