I want to make sure my amp is set correct so I am going to try and pick up a digital multimeter soon. I have never used before though. Do I need an expensive one or any work fine. (http://www.sears.com/shc/s/p_10153_12605_03482141000P?prdNo=2&blockNo=2&blockType=G2). Using the equation in the topic my voltage should be about 22.3v. What would I set the dmm in the picture too?

your voltage for WHAT should be 22.3????

I want to make sure my amp is set correct so I am going to try and pick up a digital multimeter soon. I have never used before though. Do I need an expensive one or any work fine. (http://www.sears.com/shc/s/p_10153_12605_03482141000P?prdNo=2&blockNo=2&blockType=G2). Using the equation in the topic my voltage should be about 22.3v. What would I set the dmm in the picture too?

Yes that volt meter will be fine. Set it to "ac volts".

22.3 I think you made a type-o but any one will work bro I don't see any reason a cheaper one would make any diff.

22.3 I think you made a type-o but any one will work bro I don't see any reason a cheaper one would make any diff.

No typo, you just do not understand what he is doing. Check out the pinned amplifier gain setting thread.

ahhh see... he didn't mention what it was for and I didn't want to assume...

I'm on my phone its hard to nav the site. I will assume its for a home then?

Its actually for my car. According to my guide the voltage for the amp output is the squareroot of wattage x resistance. In my case this is a 500w amp @ 2ohms. The square root of 1000 comes out to be ~22v. And when you say put it on ac volts does it matter if its on the 200 or 600?

Its actually for my car. According to my guide the voltage for the amp output is the squareroot of wattage x resistance. In my case this is a 500w amp @ 2ohms. The square root of 1000 comes out to be ~22v. And when you say put it on ac volts does it matter if its on the 200 or 600?

Select a range with a maximum greater than you expect the reading to be, 200V.

Ok thanks much,

Sure..

Here are a couple tips.

Depending on the amplifier you are using it could have a regulated or unregulated power supply. If your setup is used with the vehicle on you want to set your gain with the vehicle on. You could see a difference in ouput from 12v to 14v (vehicle off, vehicle on).

Set your gain over the range of frequencies the amplifier will be used at. For instance, my lpf is set at 60hz my ssf is set at 25hz. It tested the amplifiers output from 25-60hz tones in 5hz increments. If you see noticable fluctations examine why. I noticed that my ouput (measured in ac volts) decreased at 32hz and below even though my ssf was set at 25hz. It appeared that the ssf was affecting frequencies slightly above 25hz. I just used my 30 band eq to boost 32hz for even ouput from 32-60hz. Check to make sure you do have reduced ouput at your ssf and frequencies below your enclosure tuning freq.

This is rather easy to do. Good luck!

Edited June 1, 201114 yr by edouble101

You have no idea what the impedance is without measuring it, and you can't use that formula for accurately calculating anything without it.

Save your money and buy something usefull for yourself.