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post #271 of 278 Old 10-13-2015, 10:30 PM
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Hey Luke,

What was the difference between your recent test and the previous one mentioned below that you mention that the "7.5 lives up to it's specifications". Obviously, this time around the 7.5 was only half of it's rated power, so it didn't meet the specs.

Thanks for the info.


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Originally Posted by lukeamdman View Post
FYI - I did some basic output testing of the Crest Pro-Lite 7.5. A 2ohm load with one channel driven and also in stereo.


http://data-bass.ipbhost.com/index.p...plifier-tests/
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All my testing between the Crest 7.5, cc4000/cc5500, and the sp2-12k indicates the 7.5 lives up to its specifications.

In 4ohm stereo, the difference between the 7.5 ($800) and the sp2-12k ($3,400) was almost exactly 3db in favor of the sp2. Not bad at all considering the price and also that the 7.5 was running 120v compared to 240v of the SP2.
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post #272 of 278 Old 10-14-2015, 07:00 AM
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Quote:
Originally Posted by zeus33 View Post
Hey Luke,

What was the difference between your recent test and the previous one mentioned below that you mention that the "7.5 lives up to it's specifications". Obviously, this time around the 7.5 was only half of it's rated power, so it didn't meet the specs.

Thanks for the info.
The difference was 2ohm stereo vs 4ohm stereo.


I knew going in that the 7.5 wasn't going to reach rated power in 2ohm stereo based on other owners experiences with the amp.


However, I'm going to run the test again at 4ohm stereo and I have no doubt it'll meet specs.
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post #273 of 278 Old 10-14-2015, 09:31 AM
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Quote:
Originally Posted by lukeamdman View Post
The difference was 2ohm stereo vs 4ohm stereo.


I knew going in that the 7.5 wasn't going to reach rated power in 2ohm stereo based on other owners experiences with the amp.


However, I'm going to run the test again at 4ohm stereo and I have no doubt it'll meet specs.

Thanks Luke. It looks like you need to stick with a CC if you want to run 2 ohm loads.
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post #274 of 278 Old 02-23-2016, 04:44 PM
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I've pushed my 7500 very hard with a quad of SI18's and have never been able to shut it down. I ensure that I'm not too far into clipping though. Maybe I'm not pushing hard enough? Is this only running sine waves at single digit frequencies or something?
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post #275 of 278 Old 02-24-2016, 08:18 AM
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Originally Posted by tsloms View Post
I've pushed my 7500 very hard with a quad of SI18's and have never been able to shut it down. I ensure that I'm not too far into clipping though. Maybe I'm not pushing hard enough? Is this only running sine waves at single digit frequencies or something?
2 ohm stereo load is what does it. You have no warning like you do at 4ohm when you start to see the lights flicker and can back off a shade. With 2 ohm stereo, it is fine one second, then the channels shut down the next. It's pretty instantaneous.
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post #276 of 278 Old 02-24-2016, 08:49 AM
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Quote:
Originally Posted by beastaudio View Post
2 ohm stereo load is what does it. You have no warning like you do at 4ohm when you start to see the lights flicker and can back off a shade. With 2 ohm stereo, it is fine one second, then the channels shut down the next. It's pretty instantaneous.

Im hoping quad UM18's will be a good match since they dont really get down to 4 ohms a piece till 5hz. Well into system signal roll off territory. That should keep it just over 2 ohms per channel most of the time. We shall see

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post #277 of 278 Old 02-24-2016, 09:33 AM
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I think you'll be just fine there. One of these is a pretty solid match for 4 um18's. I do have one for sale in the classys ya know
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post #278 of 278 Old 02-24-2016, 09:43 AM
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Quote:
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I think you'll be just fine there. One of these is a pretty solid match for 4 um18's. I do have one for sale in the classys ya know
if I didnt have one already i would grab it. I know its been field tested!

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