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Author Topic: EV QRX & crest cc 4000  (Read 2162 times)

Tommy Potts

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EV QRX & crest cc 4000
« on: October 25, 2010, 04:58:57 pm »

Any thoughts on powering these speakers with these amps?

4 EV QRX 212/75
4 EV QRX 218s

One Crest CC 4000 stereo 2000 watt into 2ohm = LF
One Crest CC 1800 stereo  900 watt into   2ohm =HF
Four Crest CC 4000 bridged  4000 watt into 4ohm= SUB




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Vinny D'Agostino

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Re: EV QRX & crest cc 4000
« Reply #1 on: October 25, 2010, 05:21:06 pm »

Way too much power on the subs IMO.
The QRX218s subs get damaged real easily when run with that much power.
I run mine with 1300w @ 4ohms and I have plenty of bottom end for my needs.

My suggestion using the Crest CC series would be:

One CC4000 run stereo for (2) QRX218s x 2
One CC2800 run stereo for (2) QRX212 LF  x 2
One CC1800 run stereo for (4) QRX212 HF (2 per side)

Jeff Wheeler

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Re: EV QRX & crest cc 4000
« Reply #2 on: October 25, 2010, 06:23:06 pm »

Hey, Tommy, glad to see you on the forum!
Tommy Potts wrote on Mon, 25 October 2010 15:58

One Crest CC 4000 stereo 2000 watt into 2ohm = LF

IMO this is pretty light on power and won't take full advantage of the boxes, but it will certainly work.  That amplifier will be the one most likely to trip a breaker if you need to push things into the limiters.

Tommy Potts wrote on Mon, 25 October 2010 15:58

One Crest CC 1800 stereo  900 watt into   2ohm =HF

The QRx HF is 8Ω nominal, so you will actually present a 4Ω per channel load to this amp in a stereo configuration for 700w/side to the pair of 75w RMS drivers.  Use the DSP limiters, obviously.

Tommy Potts wrote on Mon, 25 October 2010 15:58

Four Crest CC 4000 bridged  4000 watt into 4ohm= SUB

Again, use the limiters and HPF, and be prepared to raise the HPF from the EV recommendation when the boxes are doing DJ-duty, or limit to RMS power instead of some figure above that, or cones will be ripped.
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Mike Christy

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Re: EV QRX & crest cc 4000
« Reply #3 on: October 25, 2010, 08:06:58 pm »

Tommy,

Look at the CC5500 for the subs, you may only need 2 of them, in stereo, instead of the 4 CC4000 bridged.  

No limiters needed, if you see clip LEDS then back it down. Youll need less AC wall power too.

I have both CC4000 and CC5500s, both good budget amps, reliable, have powered my subs well.

That's a heavy amp rack your building...

Mike
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Evan F. Hunter

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Re: EV QRX & crest cc 4000
« Reply #4 on: October 26, 2010, 12:09:01 am »

That seems like a great combo for your tops. As others have said you will easily damage those subs with that much power. The whole QRX line is pretty efficient and 2k per sub would serve them well. I beat on my  QRX boxes with a rack full of Macrotech Amps.  Twisted Evil
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Evan Hunter
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(4) QRX115s (4) SRX 728s Soundcraft GB8, Mackie Onyx 1640, TC Electronics fx.
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