Nathan Short wrote on Mon, 22 February 2010 14:21 |
The bucket was set up to run 2 elements per load in parallel. 4ohm.
I will go ahead and type up my full measured list for the 3602.
since the amp has no "0" level the near "0" measurement was set to at "no clip" "solid -6" The second measurement was taken as an average of moderate clip light flashing, but not solid or heavy.
It will go as follows Noise Vat"0"/V at "clip", amps/amps
Pink 6db crest 33v/45v 15a/21a 30Hz na /60v na /33a 50Hz 40v/60v 24a/33a 85Hz 50v/60v 27a/32a 1kHz 45v/60v 24a/31a 15kHz na/na 33a Dance Music Light ,hard, limit 20v/41v/50v 10a/21a/26/
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Nathan,
I can’t tell from what you wrote if these test results are both channels driven at 4 ohm, or just one channel.
Also, the PLX 3602 has no -6 indicator, it has SIG, -10 and CLIP.
The 60v sine wave figures you posted above would be a bit below the 1100 rated 20-20kHz output, 60 v at 4 ohm would be 900 watts.
By the current draw and output voltage you state, sounds like you were not quite hitting clip.
Always a question whether an amp’s clip lights come on a bit before or a bit after onset of clipping, from my experience with the PLX 3602, they come on before, but that is just “by ear”.
As Elliot pointed out, the PLX 3602 specifications state that with both channels driven with sine wave, it draws 25 amps at 8 ohms, 40 at 4 ohms, 63 amps at 2 ohms.
Back to the previous anomaly causing your concern, 81 volts into 2 ohms would be about 3280 watts, not an “abnormal” amount if the amp was hard clipping, 60 volts would be 1800 watts at 2 ohms, less than a 3 dB difference.
An amp producing a square wave can produce almost double the power output as a sine wave.
33 amps at 120 volts would not be out of line for 3280 watts delivered, 82.7 % efficiency.
Granted, both sides should perform the same, but the difference sounds like it could be a funky Clip Limiter on /off switch, with the limiter engaging on channel 2, but not on channel one.
The limiter only responds to actual clipping. When the limiter is engaged, the CLIP light indicates both clip and limit.
Art Welter