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Author Topic: PA system & power amps (please help)  (Read 4354 times)

Julian Acosta

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PA system & power amps (please help)
« on: September 21, 2011, 07:43:05 pm »

Hey everyone,

I don't really know anything about setting up PA systems and I could really use some advice.

This is what I need to accomplish:

Find a power amp that supports the Yamaha S115IVS's (500W, 8 ohms - 1/4" speaker cable plugs in the back).

http://www.sweetwater.com/store/detail/S115V

So from what I'm reading I need a power amp with 1000W @ 8 ohms. Is there any affordable amp out there that has those specs at like $300 or less?

The next step is to somehow connect this power amp to my computer/xponent (what I use to DJ). Is it possible to do this?

I can provide more detail about how I hook up my computer if you need me to.

Thanks in advance! Please ask questions if I wasn't clear.
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bruce gering

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Re: PA system & power amps (please help)
« Reply #1 on: September 21, 2011, 07:52:35 pm »

Hey everyone,

I don't really know anything about setting up PA systems and I could really use some advice.

This is what I need to accomplish:

Find a power amp that supports the Yamaha S115IVS's (500W, 8 ohms - 1/4" speaker cable plugs in the back).

http://www.sweetwater.com/store/detail/S115V

So from what I'm reading I need a power amp with 1000W @ 8 ohms. Is there any affordable amp out there that has those specs at like $300 or less?

The next step is to somehow connect this power amp to my computer/xponent (what I use to DJ). Is it possible to do this?

I can provide more detail about how I hook up my computer if you need me to.

Thanks in advance! Please ask questions if I wasn't clear.

I think that you mean 500W PROGRAM, not RMS. In this case, find an amp that can produce ~500W at 8rR (ohms). There are SOOOO many amps out there that fit the bill and will be just fine for you. A very popular economic choice is the QSC RMX series. A QSC RMX 2450 would be a good match.
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Doug Fowler

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Re: PA system & power amps (please help)
« Reply #2 on: September 21, 2011, 07:56:06 pm »

Read the rules, fix your display name.

Thank you for your cooperation.

******************

And please do reply to posts if the poster has not adhered to the name rule.
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Garry Wilson

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Re: PA system & power amps (please help)
« Reply #3 on: September 22, 2011, 03:30:29 pm »

Hey everyone,

I don't really know anything about setting up PA systems and I could really use some advice.

This is what I need to accomplish:

Find a power amp that supports the Yamaha S115IVS's (500W, 8 ohms - 1/4" speaker cable plugs in the back).

http://www.sweetwater.com/store/detail/S115V

So from what I'm reading I need a power amp with 1000W @ 8 ohms. Is there any affordable amp out there that has those specs at like $300 or less?

The next step is to somehow connect this power amp to my computer/xponent (what I use to DJ). Is it possible to do this?

I can provide more detail about how I hook up my computer if you need me to.

Thanks in advance! Please ask questions if I wasn't clear.


Another amp you can look at is the QSC GX5, priced at $400, it does have the connections you need. To get your computer into the system, I'd suggest a Radial Pro AV1 direct box ($119.00), it has a 3.5mm input for PCs or iPods. You will need a small mixer in between the direct box and the mixer. Mixer suggestion; Yamaha MG10c, cost $100.00.

All can be purchased at Sweetwater.

Garry W
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duane massey

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Re: PA system & power amps (please help)
« Reply #4 on: September 22, 2011, 08:53:57 pm »

Get something like this (several brands out there) if you're using computer w/usb ports:

http://www.musiciansfriend.com/pro-audio/behringer-u-control-uca202-usb-audio-interface/702540000000000

A mixer would be a good thing to have, as it will allow you the ability to add a mic, and give you some control between your PC and the amp, as well as a means to use another device (CD, iPod, etc) should your main source crash.
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Mike Pyle

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Re: PA system & power amps (please help)
« Reply #5 on: September 22, 2011, 11:59:08 pm »

Hey everyone,

I don't really know anything about setting up PA systems and I could really use some advice.

This is what I need to accomplish:

Find a power amp that supports the Yamaha S115IVS's (500W, 8 ohms - 1/4" speaker cable plugs in the back).

http://www.sweetwater.com/store/detail/S115V

So from what I'm reading I need a power amp with 1000W @ 8 ohms. Is there any affordable amp out there that has those specs at like $300 or less?

The next step is to somehow connect this power amp to my computer/xponent (what I use to DJ). Is it possible to do this?

I can provide more detail about how I hook up my computer if you need me to.

Thanks in advance! Please ask questions if I wasn't clear.

Do you already own those speakers?
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Yosi Melamed

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Re: PA system & power amps (please help)
« Reply #6 on: September 23, 2011, 04:01:45 am »

Hey everyone,

I don't really know anything about setting up PA systems and I could really use some advice.

This is what I need to accomplish:

Find a power amp that supports the Yamaha S115IVS's (500W, 8 ohms - 1/4" speaker cable plugs in the back).

http://www.sweetwater.com/store/detail/S115V

So from what I'm reading I need a power amp with 1000W @ 8 ohms. Is there any affordable amp out there that has those specs at like $300 or less?

The next step is to somehow connect this power amp to my computer/xponent (what I use to DJ). Is it possible to do this?

I can provide more detail about how I hook up my computer if you need me to.

Thanks in advance! Please ask questions if I wasn't clear.

Hey Julian,
I couldn't figure out if you have one yamaha speaker or two?

A couple of people suggested you buy a USB interface and a mixer. I think the best and higher quality sound would be achieved from buying a mixer that already has a USB input. I have the Allen & Heath ZED 10 and it's great, it's around $200 on eBay. The Mackie ProFX8 was my second choice since it has better preamps but slightly lower reliability.

I don't know if your budget allows for a mixer and an amp so maybe the best thing would be an amplified mixer with a USB interface?


« Last Edit: September 23, 2011, 06:19:52 am by Yosi Melamed »
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Brad Weber

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Re: PA system & power amps (please help)
« Reply #7 on: September 23, 2011, 05:54:25 am »

So from what I'm reading I need a power amp with 1000W @ 8 ohms.

Unless you have identified the output you want and from that calculated the power required to obtain that output, then you don't know what you "need", only what may be a reasonable number without any application specific considerations.  As Bruce pointed out, the 500W number is the Program rating so that is probably about what you want.


That being said, you may have trouble finding an amplifier rated 500W per channel into 8 Ohms for $300.  You'd need to either go up in price for something like the QSC GX5, look at a used amp or go with a GX3 or a Behringer iNuke with a little less power (for some reference, the difference between 500W and 350W is 1.5dB).


I believe the Xponent acts as the interface and mixer with USB to the computer and stereo, RCA outputs.  As long as you are running the Yamaha speakers full range and not using subwoofers then you don't need anything else although you might benefit from a speaker processor or at least an equalizer.
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Paul Dershem

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Re: PA system & power amps (please help)
« Reply #8 on: September 25, 2011, 12:32:26 am »

Julian, are you planing on running your speakers are full volume? If not, a 250W amplifier would only be 3dB quieter.
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Re: PA system & power amps (please help)
« Reply #8 on: September 25, 2011, 12:32:26 am »


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