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Old 3rd July 2008, 06:14 AM   #91
djQUAN is offline djQUAN  Philippines
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I have done a bit of power testing with the amp.

with a 2 ohm load, with full signal I can send it into slight clipping (afraid to go further as the 8's are going into over excursion). clipping is clean as the tops of the sine wave simply flattens.

I have measured about 1055watts going into 2ohms and that already accounts for the voltage drop of the power cables. the only thing warm was the part of the top plate directly above the output inductor. the main heatsinks are only slightly warm.
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Old 3rd July 2008, 06:20 AM   #92
luka is offline luka  Slovenia
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Hi

NICE! How did you measure power? How's the sound, bass in this case?
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Old 3rd July 2008, 12:38 PM   #93
djQUAN is offline djQUAN  Philippines
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I used an oscilloscope on the output terminals with the two 4ohm speakers in parallel. measured peak voltage and calculated rms volts then watts.

I made another vented box tuned a little higher. 1.4cuft 34Hz. my vision blurrs when inside the car. if you didn't know, you'd say I have two 12's at the back.
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Old 3rd July 2008, 12:58 PM   #94
Eva is offline Eva  Spain
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Does it only produce +/-65V peak with 2ohm load? I was expecting more (but it's just a car-audio amplifier). Use a music signal if you weren't doing so.
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Old 3rd July 2008, 01:01 PM   #95
djQUAN is offline djQUAN  Philippines
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yes, I'm using a music signal. I wasn't able to measure the input voltage but I bet it was below 12V or so. my car has a small alternator.
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Old 3rd July 2008, 01:15 PM   #96
luka is offline luka  Slovenia
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Hi

Note that speakers change their impedance, you sure you really got that power?

You could use small "current" resistor to measure current and voltage after that to get more real power
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Old 3rd July 2008, 01:27 PM   #97
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I don't know. I wasn't trying to get the exact output. just a ballpark figure to know how much power there is.
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Old 3rd July 2008, 07:42 PM   #98
Eva is offline Eva  Spain
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Quote:
Originally posted by luka
Hi

Note that speakers change their impedance, you sure you really got that power?

You could use small "current" resistor to measure current and voltage after that to get more real power
When calculating power, nominal impedance is usually taken because this allows to compare amplifiers. Then again, music signal is not a continuous tone and load impedance is strongly frequency dependent. Calculating the actual power involved requires a sophisticated analyzer and the reading would no longer be an indicator of how loud an amplifier can get.
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Old 4th July 2008, 03:40 PM   #99
djQUAN is offline djQUAN  Philippines
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had a trip this afternoon. around an hour with the amp blasting, and same thing when I returned home. amp is still alive.

A/C was off, heatsink is around 45degC (didn't have my thermometer at hand) with minimal cooling.

the amp has more power than I'll ever need so I guess it will last with me.
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Old 16th August 2012, 08:50 AM   #100
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Is there a Service Manual for the ZX1000.1 Amp ?
Anyone Got It ?
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