i got 2 of those jaycar 1500w monos
i wanna see what power they are putting out anyone care to help outy here
Full Version: how would i test, or who wants to test amps
Go see Tony.
Buy a DMM and a True RMS Clamp meter.
I'm interested to see the results of this.
whilst playing a test tone, you want to measure the voltage out of the speaker terminals, and the current in the speaker wire (on AC).
Power (Watts) = Volts AC X Current Amps.
so 48V x 45A = 2160 Watts RMS.
If your meter is not True RMS, then reduce the calculated power by about 5% to get the RMS value.
another way to measure the current, if you don't have a clamp meter, is to put a 0.1 ohm resistor (marked 0R1 on it) in series with the speaker. This would want to be at least 20Watt resistor. then the measured voltage on the resistor = 1/10th of the amps, so 4.8V = 48Amps.
whilst playing a test tone, you want to measure the voltage out of the speaker terminals, and the current in the speaker wire (on AC).
Power (Watts) = Volts AC X Current Amps.
so 48V x 45A = 2160 Watts RMS.
If your meter is not True RMS, then reduce the calculated power by about 5% to get the RMS value.
another way to measure the current, if you don't have a clamp meter, is to put a 0.1 ohm resistor (marked 0R1 on it) in series with the speaker. This would want to be at least 20Watt resistor. then the measured voltage on the resistor = 1/10th of the amps, so 4.8V = 48Amps.
QUOTE (Pulse-R @ Jan 22 2007, 09:57 PM) 
I'm interested to see the results of this.
whilst playing a test tone, you want to measure the voltage out of the speaker terminals, and the current in the speaker wire (on AC).
Power (Watts) = Volts AC X Current Amps.
so 48V x 45A = 2160 Watts RMS.
If your meter is not True RMS, then reduce the calculated power by about 5% to get the RMS value.
another way to measure the current, if you don't have a clamp meter, is to put a 0.1 ohm resistor (marked 0R1 on it) in series with the speaker. This would want to be at least 20Watt resistor. then the measured voltage on the resistor = 1/10th of the amps, so 4.8V = 48Amps.
whilst playing a test tone, you want to measure the voltage out of the speaker terminals, and the current in the speaker wire (on AC).
Power (Watts) = Volts AC X Current Amps.
so 48V x 45A = 2160 Watts RMS.
If your meter is not True RMS, then reduce the calculated power by about 5% to get the RMS value.
another way to measure the current, if you don't have a clamp meter, is to put a 0.1 ohm resistor (marked 0R1 on it) in series with the speaker. This would want to be at least 20Watt resistor. then the measured voltage on the resistor = 1/10th of the amps, so 4.8V = 48Amps.
5%????
Phil
QUOTE (DD Phil @ Jan 28 2007, 10:21 PM)
5%????
Phil
Phil
you're telling me.. where do people come up with these magic numbers and calculations ?Especially when there's a tutorial telling you how to do it, and do the maths, correctly.
RMS = Root Mean Square 
So ladies, if you're into mean squares, call me!
Phil
So ladies, if you're into mean squares, call me!
Phil
QUOTE (DD Phil @ Jan 28 2007, 11:22 PM)
RMS = Root Mean Square
So ladies, if you're into mean squares, call me!
Phil
So ladies, if you're into mean squares, call me!
Phil
Phil, you are an animal...
QUOTE (DD Phil @ Jan 29 2007, 08:52 AM)
RMS = Root Mean Square
So ladies, if you're into mean squares, call me!
Phil
So ladies, if you're into mean squares, call me!
Phil
thats actually quite clever
Jack
QUOTE (DD Phil @ Jan 29 2007, 10:22 AM)
RMS = Root Mean Square
So ladies, if you're into mean squares, call me!
Phil
So ladies, if you're into mean squares, call me!
Phil
Now now Phil. You are a married man after all
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