Jun 09, 2008 12:42 pm I know there are a few guys on here that can answer this question and then probably give you the scientific reasons behind it, but I am not that guy :) They will show up eventually.
What Amp for my speakers?
Posted on Jun 09, 2008 09:16 am
Ashley100010
Member Since: Jun 09, 2008
Hey
Can anyone help?
Im pretty new to this. I’ve just purchased two speaker and it would be great if anyone could recommend a power amp that would match them.
I have two JBL JRX125 speakers that run at 500w rms 1000w peak 4 Ohms
I asked in an audio shop and the guy said I should maybe go for a crown xls 402 that gives me 450w per channel stereo, 4 Ohms but I was looking at manufacturers recommendations and they state I should get an amp that is three time my speakers rms output. Is this right?
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Jun 09, 2008 12:42 pm I know there are a few guys on here that can answer this question and then probably give you the scientific reasons behind it, but I am not that guy :) They will show up eventually.
Jun 09, 2008 06:56 pm Yep, Rob should be around shortly and he is the best bet for heading you in the right direction.
You simply want to make certain though that you choose and amp with enough power to hit at least the minimum power requirements of the speaker's.
Jun 09, 2008 10:47 pm Sorry I'm late guys. Just got off of another H.S. graduation. Only 99 degrees and high humidity again. Oh, and no shade this time. Fun.
OK, as far as the three times the rms. That would be wrong. The reason is that you have a passive crossover.
The passive crossover can not handle that kind of power with out damaging the components on the card.
The specs on your box is listed as 1000 watts peak. by exceeding this by 500 watts, will create to much heat, and lead to failure.
There is a way to do this. By adding another box per side. By doing so, you can run up to 2000 watts peak.
Now the recommendation that you received from your music store, wasn't all that bad. The Crown XLS series is very good. Personally, I would go with the 602 instead of the 402.
It's only a small amount over the listed rms value. This will give you a little more head room.
By the way, I worked for the guy that sold that design to JBL. They are not a bad sounding box.
Jun 10, 2008 10:12 am Thank you for your help and recommendation I will definitely have a look at the 602.
Sorry, just another little question. When I do get my amp should I have the output volumes on it high and then adjust the volumes on the input? Its just I heard this is how it should be done and I don’t want to damage my system if this is wrong.
Where should I increase the volume, at the input stage or at the amp?
Thanks.
Jun 10, 2008 06:04 pm There are two common practices on this.
One is to run the inputs on the amp all the way up, and adjust the master fader on the board down a little. (The knobs on the front of the amp are for the inputs.)
The other is just the opposite. Running the master fader at unity, and back down the inputs on the amp.
Each is effective. I usually go with the first. This tends to keep the signal to noise level a little cleaner.
Jun 10, 2008 09:29 pm Yep, I'm with Rob as well. I run my amps with the volumes at full tilt and control the volume with mixer and and a Mackie Big Knob which runs to my different speaker set ups.
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