I just bought the Cobra 25 wx st CB system and the 35 dollar PA powerhorn speaker from Radioshack. I am thinking about buying an amp to hook it through because apparently you also need an amp to make the powerhorn sound loud.
My question is, the pa speaker is
8 ohm impedence
350-9000mhz frequency response
110db MHZ output
50w rms power hoandling
100w Maximum power handle
can I just get any amp to fit it? or does it also need to be 8 ohms? I heard of a guy who bought 8 ohm amp but had 4 ohm speakers so it wouldnt fit. So, im confused.
8 ohm is a high impendance speaker for a car. Will it work yes. the hard part will be to find a amp that makes any kinda of power @ 8 ohm. At the least you will find most amps will make less power at a higher impendance.
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Oh, yea that 8 ohm impedance is solely my powerhorn pa. As for my speakers I have no idea what ohms they are. But is there a chance the amp might not be compatible with my speakers? I think theyre sony.... not that the brand name helps any.
the amp is from audiofonics apparently from Pimp your ride, its attached to the custom sub box for 2003-2006 jeep behind the rear seat with JBL speakers . As for my speakers I have no idea what the ohm impedance is.
Car audio amps are generally rated at 4 ohms. When you power an 8 ohm speaker with a 4 ohm amp the speaker will only receive about 1/2 of it's rated power. The RMS of the PA speaker is 50 watts which means you could probably get away with a 100 watt 4 ohm amp.
Correct - but you don't really want to go the other way unless you have quality amps/speakers i.e. don't power 1 or 2 ohm speakers with a crappy amp or it won't last long - the amp has to be designed to sustain that load.
hmm. Say i have 4 ohm speakers, and a 4 ohm 1500w amp... what would you say... good bad?
On another note i got a free papaya from Ralphs the neighborhood grocery store. Clerk rang it up wrong by like 5 bucks and she just gave me a 100% refund and I kept the papaya. YEA
You don't want to exceed the speakers rating of 50W so if you have a 4 channel 200W RMS amp you would be ok if you only send 1 channel to the speaker; but you wouldn't want to bridge 2 channels and send 100W to the speaker...
Why do you need to hook up the PA to an amp? It's already rated at 110dB efficiency, one of the highest available likely due to the horn. Efficiency ratings are taken with only 1 watt input.
I'd try it as is, unless you want to talk to Tijuana from your driveway
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Sheesh, much ado about nothing. His PA speaker will not require many watts to drive it to full power output at all, all this worry about amps not putting out their entire wattage capability into 8 ohms is pretty meaningless. A small simple amp is all that is needed, no high-end audio amps need apply.