Question about Radio Shack 250 Watt PA Amplifier Amplifier

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Ballpark I have a RS 250 watt amp and need to hook to two speakers, the kind that are cloth or felt covered,....have them mounted each game about 100 feet in each direction from the amp. I've always used just bare wire connections at each end. The amp does not have a plug in type for the speakers, but the speakers do. What's the best way to handle this situation for maximum output and clarity? Thanks

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There are a couple of ways you could do this. One way is to buy some do-it-yourself connectors (RCA or 1/4", depending on the type of output jacks on your PA) and solder them to the bare-wire that you already have running to your speakers. That will create a good connection for you with minimal loss and minimal distortion. The other option is to purchase 1/4" instument cables from a music store, like guitar center, and cut one end off. Strip back the wire casing and connect directly to your speaker inputs.

Hope this helped.

Posted on Feb 19, 2009

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You extend wire from speaker what ever you want distance.

Posted on May 26, 2008

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How manny watts per channel??


I'm guessing the 200w are the Speakers maximum input, right?
Is the sub passive or active(=integrated Amp)?

If it's a passive sub:
If it's a 2-Channel Amplifier, you're talking about, you won't be able to connect all 3 - unless you can live with one speaker being significantly louder than the other or your amplifier going up in smoke...

As to the power required, if it's 250W PER CHANNEL the amp will blow your speakers, if it's 250W combined you may not be able to drive them to their absolute limit but they will be loud enough (they probably reach their db-limit with less than 200w but if they reach it with 200, you'll only get ~6db less than that with 125w per channel)

The Watt-numbers on (passive) speakers only tell you how much they can take before they are damaged, the relevant numbers for your problem are the efficiency (the unit is db/W or db/2,83V) and the maximum db-level (most floorstands can produce between 100 and 110 db at one meter distance)

If your speaker produces i.e. 87db/W at 1 meter distance (which is the standard measuring distance), it will produce ~97db at 10W, ~107 at 100W, etc. - unless it reaches it's limit before that. Most speakers can take a lot more power, than they need to reach their limit but they won't get any louder if you keep turning up the volume beyond that (they'll probably produce more distortions though, so don't)


As to the sub:
if it's passive, you'll need another amp (there are special amp-modules for subs, but any amp with enough power will do)

if it's active, you can connect it to the sub-out of your preamp (I'm guessing the PA Amp you mention is a Main Amp, not an integrated one) or your integrated amp via cinch (a tape-out works too)

OR you can connect it to the speaker outputs and than connect the speakers to the sub - in that case the sub is still NOT driven by your main amp but you can use it's crossover to separate low frequencies (--> SUB only) form higher frequencies (--> SPEAKERS only).

Most active subs can be connected both ways, if yours can't your stuck with one.

Rarely there is a third way, which only works if your sub supports it and if you either have seperate Pre- and Main-Amp or if your integrated amp has a Pre-Out and a Main-In (in that case in can be split into preamp and main amp)

IF you want to use your subs Crossover (which is good idea, provided it has one), you'll have to connect it between Amp and Speakers (works with allmost all active subs) or between preamp and main amp (works only with a few)



I hope this is helpful

Jan (Hamburg, Federal Republic of Krautistan)

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