Crest CPX-2600/1500 or QSC 2450/1450 or Crown CE1000? - diyAudio
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Old 5th April 2005, 10:22 PM   #1
Feandil is offline Feandil  United States
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Default Crest CPX-2600/1500 or QSC 2450/1450 or Crown CE1000?

I need an amp to power my line arrays... I wanna go sorda cheap so I'm probably just gonna get a Crest CPX-1500 or QSC 1450/1850HD or Crown CE1000

But I've read some reviews and everyone says the QSC plays 2 ohm stereo ALL day without problems, and that's where my setup would run it at...

so... my question is... which of these amps can play 2 ohms stereo without problems? this would be the only load it would ever see from me... and it would be all day long... I don't want it to cut out/add noise...

NO noise

the Crown is the least powerful, but on a sagging outlet it puts out rated power still...
the QSC is a beast with awesome cooling and a cheap pricetag to boot...
the Crest is cheaper than the QSC... especially the 2600 vs. the 2450... and they say it only has 1% THD when driven to full power at 4 ohms bridged (2 ohms stereo)... the CPX-1500 is what I would get...

so what's the best choice for 2 ohms stereo? CPX-1500, QSC 1850HD, or Crown CE1000?
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Old 6th April 2005, 01:33 AM   #2
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My cousin who does quite a bit of gigging up in Liverpool runs both an EP2500 and QSC 2540.

I've heard both but its hard to tell any differences between them in a live situation and I haven't had the chance to hear them in the relaxed atmostphere of a lounge.

In his words though, the QSC is better into 2ohm loads such as paralleled woofer arrays - which he uses and the Behringer does the mid highs on some large Mackies.

Think the Behringer would clip into 2ohm's at very high SPL's on the bass. QSC is also heavier and hence I suspect better built. I know you didn't ask for advice on the EP2500 but its all I've got to go on at the moment. By all account the QSC looks to be solid.

Not really much help but I'll try to quiz him harder next time we speak.
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Old 6th April 2005, 02:01 AM   #3
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Go cheap and build your own! DIY.

Take one LF357, 2xBC546/BC556 pairs, 1xBF469/470 pair and a bunch of MOSFETs like IRFP240/9240, one transformer of your amp power rating and 20KuF C's

oh and a box and heatsinks. 0.01% THD easy.
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Old 6th April 2005, 02:44 AM   #4
Feandil is offline Feandil  United States
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I'm not into that much DIY

I COULD do that... but I'm really impatient...

thanks for that advice... yes the Behringer is a QSC clone but the QSC has a much larger torrid...

the QSC also has better cooling...

any more help?
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Old 6th April 2005, 02:53 AM   #5
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Quote:
Originally posted by amplifierguru
Go cheap and build your own! DIY.

Take one LF357, 2xBC546/BC556 pairs, 1xBF469/470 pair and a bunch of MOSFETs like IRFP240/9240, one transformer of your amp power rating and 20KuF C's

oh and a box and heatsinks. 0.01% THD easy.

I think it would take a lot of scrounging to build an amp capable of that much power for cheaper than a QSC RMX.(not that it can't be done) Heatsinks, Case, Transformer... I always find projects cost more than I expected when I started. That being said this is DIYaudio.com... What answer would you expect?

I spent awhile deciding what pro amp to get for my subs... I ended up getting one of the cheapest: Crown XLS (the 602)... More than enough for me running two 8 ohm subs. I got the fans slowed down and I never feel even the slightest warmth coming out of the amp at any listening level that my mains can keep up with...

I think any of the amps you mention are capable of more than you will likely require of them. With the efficiency of the line array you will likely have bleeding ears before you have power problems. Is it really necessary to run at 2 ohm?
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Old 6th April 2005, 02:57 AM   #6
Feandil is offline Feandil  United States
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what answer would I expect???

a fair one that's all I want
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Old 6th April 2005, 04:08 AM   #7
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IMO, there's no contest between the QSC and Crown. The QSC is simply a beast. I have run my RMX850 on tough loads all day without any problems. Plus, QSC tests their amplifiers into all protection modes which Crown must skip, at least on some models. Furthermore, the RMX series has socketed op amps on the front end which I like because you can change them. It should have 5532 from the factory. Last but not least, I think Crown offers it as well, but the QSC will have a 6 year warranty if you register it.
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Old 6th April 2005, 04:18 AM   #8
Feandil is offline Feandil  United States
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awesome... so Crown is eliminated... what about Crest??????
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Old 6th April 2005, 01:22 PM   #9
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amplifierguru: pls. post some of your projects

I think they will be of great help to the diy community.

and most specially when they came from the brilliant minds and golden ears.

regards,

hienrich

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Old 6th April 2005, 09:42 PM   #10
Feandil is offline Feandil  United States
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nobody has used Crest???
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