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post #1 of 5 (permalink) Old 11-25-2007, 09:09 AM Thread Starter
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Location: Michigan
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Speaker Cabs & Power Amps

I am building my PA rig. I am building so that I can add, if necessary, at a later time.

My concern is buying cabinets that will get blown or that will damage the power amp. What speakers will work with a power amp that is 1,050W/ch @ 2 ohms, 800W/ch @ 4 ohms, 500W/ch @ 8 ohms, 2,100W bridged mono @ 4 ohms, 1,600W bridged mono @ 8 ohms?

I am looking small & cheap now - so can I get away with 2 8ohm 400W program; 800W peak speakers?
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post #2 of 5 (permalink) Old 11-25-2007, 11:42 AM
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Re: Speaker Cabs & Power Amps

This is just my opinion.....It sounds to me that your amp will be to large for the speakers you want. For me, PA amps work best at full or close to full power. You will have to get speakers that can handle that. I would either get a smaller amp or plan on getting some really good speakers....Just my opinion.......

Last edited by Thomas Welch; 11-25-2007 at 11:43 AM. Reason: word change
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post #3 of 5 (permalink) Old 11-25-2007, 06:48 PM
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Re: Speaker Cabs & Power Amps

I replace all the PA speakers in my rehearsal rooms with 400W (continous) 12" Eminence drivers that we buy in bulk from France. Since we started doing this, we have never blown a driver. We run 600w/channel PAs into them. You could probly get more powerful ones from the same place too.

So I would seriously recommend buying good-but-tired PA Cabs and then putting new higher-rated speakers in em. And in the limited testing I have done (slamming a MInidsic player into the PA out of interest) they sounded awesome, nice and dark mids like nightclub sound systems.

PM me, I wil get our tech to give you contact details of the supplier if its of interest.
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post #4 of 5 (permalink) Old 11-26-2007, 10:33 AM
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Re: Speaker Cabs & Power Amps

How cheap is cheap?

We're using JBL cabs with 2x15" and horn for FOH rated at 500 RMS, 1000 peak @ 4 ohms. They run about $420 each. You can get a 2x15 Peavey cab with 700/1400 rating for about $300 each. For monitors, we use powered JBL 1x15 EON cabs - 2 on the floor and 2 as side fills at the rear.

You can't beat the reliability of JBL, Mackie, Peavey or Yamaha. I've also heard good reports on Behringer if you're considering price as your main objective. I've never listened to them compared against the others I've listed.

Hop on over to GC and test away! Take a CD similar to the music you'll be playing to get a more accurate point of view.
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post #5 of 5 (permalink) Old 12-08-2007, 12:10 PM
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Re: Speaker Cabs & Power Amps

As a pro live engineer for 20 years, here is some more info to digest. I always prefer to have the largest amp possible and rarely fry any drivers. Why? because one thing that will fry voice coils is distortion from an amp clipping. If you can't hear when you are overdriving a system, then you need to educate your ears(no offense here, just want to help everyone learn from my experiences). Most touring systems are using amps that deliver 2000 watts plus per channel, even on the horn drivers! My last house gig was at a large casino with a V-DOSC rig. QSC PL4.0 amps(2000 WPC) on everything except subs(which were QSC 9.0 amps @4500 WPC). A high-powered amp doesn't have to work so hard so it stays clean. Decent speakers will last IF you don't distort them and don't ask them to do a room that is just too big for the number of cabs. Also, since we are talking to some newbies, always get the 12 guage speaker cables so your watts actually reach the speakers. It does make a difference. If you can afford the extra $, get cabs with large(1.5" to 2") drivers as they sound much better and cover larger rooms than 1" drivers.
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