Setting The Gain

[Guest mkornely89]

You can maniupulate ohms law, and test whatever you want, test it in volts, amps, watts, it doesnt matter.

[Guest mkornely89]

Does speaking like that fill some sort of void in your life Boon?

Edited January 17, 2009 by mkornely89

[Boon]

Does speaking like that fill some sort of void in your life Boon?

Yes. Yes it does.

I don't care how you manipulate ohms law, you don't know what you're talking about so don't go giving advice about how people should do things.

46 amps on the speaker outputs, jeez, do you even own a stereo? If you do, I suggest you go put your multimeter on the 10A setting across the speaker terminals of your amp, let us know how it goes for you before recommending that other people do it.

Edited January 17, 2009 by Boon

[Stephen]

wow...out of the 9 responses some actually managed to answer the OP's question...

thats for amps, you need volts. set it on 200v

[MickyMcD]

mkornely89, an amplifier does not output a constant voltage from its terminals. What you are implying is that an amplification device is always outputting the input voltage and no more, no less, so that the change in amplitude is simply a change in output current.

No.

Listen to Boony. Please. Before you hurt somebody.

Cheers,

Mick

[Guest]

Do you really think the B+ has anything to do with the output current?

THE AMPLIFIER DOES NOT OUTPUT THE B+ VOLTAGE

hmm....seriously? input battery voltage directly correlates (right word?) how much power your amp will put out at a specific THD and ohm load. your amp will output more power at 15v than 12v, why in the hell do you think SPL people run their setups at 16-18v and not 12-14v like the rest of us.

your amplifier will output both amps and ac volts.

should we trust a guy that has posted 20 things, or someone that has been on here for more than 2 years?

but you would want to set it in the AC volts range to help read how much power your amp is outputting..

Edited January 17, 2009 by Krannyman92

[MickyMcD]

I'm not sure if you meant Boon was wrong, but just in case you did....

The reason your input voltage is in direct proportion to your output voltage might have something to do with the fact that an amplifier is an electric device. It has a power supply. Now, let's follow the wrong way of thinking, that input = output voltage. That means that your CPU, HDD, CD, M/board, Keyboard etc etc are all running at either 110 or 240v. Or that amplifiers with an inbuilt Switch Mode Power Supply with Power Factor Correction like a Camco V12 or Powersoft K20 are outputting from 110 TO 240v, depending on what country you are in.

Once again, no.

A power amplifier uses its linear power supply to set a vmax and vmin, or maximum voltage rail and minimun voltage rail, which really is just the vmax but in reverse polarity. These vmax and vmin determine the absolute maximum voltage passing through the amplification circuitry. As output is increased, load on the power supply is increased and it supplies current to suit. This current and voltage from the supply powers the power stage of the device to modulate the incoming signal to a high level output signal.

So, if the power supply is fed by 14.4v, who gives a shit really. It will probably set its vmax and vmin around 50+ volts, determining on the build of the device and how much power it is needed to output. An automotive power supply is just one build to use low voltage and high current to get what it needs, not the reverse for mains powered devices.

Therefore OP, take your DMM and do set it to 200v, place that on the output terminals of your amplifier and use Voltage Squared divided by Impedance. Just take your voltage on ze output terminal, square it and divide it by your loudspeaker or speaker's resistance. Badah! Instant output wattage.

Cheers,

Mick

[Boon]

hmm....seriously? input battery voltage directly correlates (right word?) how much power your amp will put out at a specific THD and ohm load. your amp will output more power at 15v than 12v, why in the hell do you think SPL people run their setups at 16-18v and not 12-14v like the rest of us.

your amplifier will output both amps and ac volts.

should we trust a guy that has posted 20 things, or someone that has been on here for more than 2 years?

but you would want to set it in the AC volts range to help read how much power your amp is outputting..

Most car audio amplifiers that use a standard unregulated switch-mode power supply do indeed increase their maximum power output when the power input voltage is increased.

I could go into a lot of detail about why but I won't.

Some amplifiers regulate the input voltage so they make the same power at any input voltage (JL Slash series)

He was saying that to work out your output wattage you check the INPUT voltage and the OUTPUT current - which is patently ridiculous, as outlined by MickyMcD above. An amplifier increases both the voltage AND current and the input voltage has no effect on the output, other than the point at which clipping occurs.