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  #1  
Old 03-08-2013, 01:04 AM
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Default Crescendo BC3500D clamp test: stock electrical

MY EYE'S!!! Clamp testing Crescendo BC3500D on stock electrical - YouTube

Remember this, this amp is rated at 1900 watts at 2 ohms, with my box rise I was at 2.17 and clamped 2,200 watts repeatedly at different hz, Thats 300 watts over rated power on a stock electrical system, not bad, not bad at all.
READ BELOW FOR THE RESULTS

Also the DMM was only hooked up to one coil.
With my box rise, the lowest impedance I have reached was 2.17 ohm @27 hz
I think I need to recone to a dual 1 ohm to compensate as soon as my electrical is done being upgraded.
Heres the results, so remember, this whole test ran at 2 ohms and up,
OK, my head unit is in and working fine now, so I figured I'd run a clamp test to see if it made any difference at my cars resonant frequency, I am tuned to 36 hz, but my peak SPL in competition is 47 hz. Off of the factory head unit my highest clamp i've ever done at 47 hz was 1,200 watts, which sucked cause im not using any power at my peak hz.

Here is how todays clamp went, remember, stock electrical, stock battery up front, stock 150 amp alternator, no big 3.
the car was running and idles at 13.6 volts.

I kinda rushed through it, I was in my driveway and wanted to only piss my neighbors off for a few minutes, my step son filmed the whole clamp test, but the picture is upside down, I need to put it on the computer and see if I can flip it. The bet part is after the 47 hz blast his saying "The sound is making my eyes hurt" lol

27hz 2,200 watts
28hz 2,184
29hz 2,204
30hz 2,142
31hz 2,109
36hz 1,888
40hz 1,492

I have some box rise that seems to start around 35/36hz and goes through approx. 44hz, I want to re clamp from 33hz through 46hz to pin point exactly what is happening, and see where the power loss is. It was very loud (neighbors like wtf) so after I did 40 hz, I went straight for 47 hz which is around my peak hz,

47 hz 2,200




Now given, when I add a batterie(s) and get my alternator, I will be able to provide the amp with power to make what its capable of producing.

So from clamps im getting 1,000 more watts at my peak 47 hz now, so it is significantly louder.

Last edited by iamsonic; 03-08-2013 at 11:11 AM.
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  #2  
Old 03-08-2013, 06:11 AM
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What are you wired down to? You keep saying test was done at 2 ohm and the lowest impeadance rise was 2.17ohm. Also your idle voltage is 13.6 which is low. Have you tried charging your battery any?
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Old 03-08-2013, 08:19 AM
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How exactly are you calculating this?

I see 74 volts and 14 amps.

That's 1,036w rising to 5.2ohms.
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Old 03-08-2013, 08:30 AM
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Right??^^
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Old 03-08-2013, 08:44 AM
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Quote:
Originally Posted by TaylorFade View Post
How exactly are you calculating this?

I see 74 volts and 14 amps.

That's 1,036w rising to 5.2ohms.
thats what I get too... maybe its different cuz its not box rise but barrel rise lol
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Old 03-08-2013, 08:48 AM
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Yeah I watched the YT video and wondered how he got those numbers...
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Old 03-08-2013, 08:55 AM
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Not to mention they are cheap centech Harbor freight meters. Not the most accurate.

The post is full of fail. Numbers are in accurate. As well as I think OP doesn't really know what he may be doing. Judging by the way he calculated his numbers and the testing involved.

The numbers given and what was played on the video are totally opposite.
He says he clamped 2200 repeatedly yet it was only over a 7hz bandwidth.
Also he says the meter was only hooked to one coil
Box rise was only .17ohm according to the post.
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Old 03-08-2013, 08:58 AM
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Quote:
Originally Posted by audioarsonal View Post
Box rise was only .17ohm according to the post.
Yeah it looks like he was at 5-7 ohms rise in the vid from the brief part I watched.
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Old 03-08-2013, 09:00 AM
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I think he was sippin some sizzurp! LOL
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Old 03-08-2013, 09:21 AM
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The dmm was only hooked up to one pair of pos and negs going to the sub, so that number is doubled, it is wired in 1 ohm.
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