which powered amp to buy?

[drummerboy930]

I've decided i'm going to buy the Behringer UB1832....so now i need to buy a power amp to power my speakers....which one do any of you reccommend buying under the $350 dollar range?? I was looking at the crown XLS 402 and was wondering if this would be good for yamaha s15e cabs?

[SPINSTERWUN]

Originally posted by drummerboy930
..... I was looking at the crown XLS 402 and was wondering if this would be good for yamaha s15e cabs?

What is the wattage of the amp and the speakers.

Peace...

spin

[drummerboy930]

The speakers have a 250/500 watt handling, and the amp has 570 watts per channel @ 2 ohms, 400 watts per channel @ 4 ohms, and 260 watts per channl @ 8 ohms. 800 watts @ bridged mono.

[Tim Brown]

Originally posted by drummerboy930
I've decided i'm going to buy the Behringer UB1832....so now i need to buy a power amp to power my speakers....which one do any of you reccommend buying under the $350 dollar range?? I was looking at the crown XLS 402 and was wondering if this would be good for yamaha s15e cabs?

Welll, your Amplifier needs to be 1.5 times the speakers rating at the same Resistance.

So, if you have a 300 watt speaker @ 8 Ohms, to properly power it you will need an Amplifier that puts out 450 Watts @ 8 ohms for EACH of these speakers that you intend to power.

So, if you want to run a pair of speakers, and each speaker is 300 watts @ 8 ohms, you need a STEREO amplifier that will produce 450 watts @ 8 ohms - PER CHANNEL.

Most Amplifiers, at best are only 70-75% efficient....30 percent of the power that they produce turns to heat before it ever hits the speakers.
What does this mean to you?
It means that for every 100 watts of power the Amplifier is rated for- it really only produces 70 to 75 watts.

Speakers are almost universally destroyed from not having ENOUGH power, not from having too much power.
When a Power Amplifier is driven into overdrive, it sends a a distorted signal to the speaker, which will (over time, or perhaps all at once) blow or "fuse" the voice coil of your speakers.


Since these speakers have a 250/500 watt "program/peak" rating, I would suggest you power them with an Amplifier that will put out 500 watts per speaker at 8 ohms.




Tim

[drummerboy930]

Thank you, you just saved me a big mistake!!!

[drummerboy930]

Oh yeah i forgot to ask this....what are ohm's and whats the difference between 570 watts @ 2 ohms and 260 watts @ 8 ohms

[Danelectron]

Ohms are resistance, in this case the amount or resistance of the coil/electronics in the speaker.
An amp puts out a given amount of power into a given speaker.

The ohm rating is the amount of resistance that the amp "sees" the speaker providing. If you replace the given speaker(say 8 ohm) with a lower(say 4 ohm) speaker, the amp will "see" an easier load and thus will play louder at the same volumn setting. The amp doesn't put out more power, it simply provides more output due to less fight from the speaker.

This is a simple explanation of what is happening.