zinger002

iTrader: (1)

music is measured in peak power is it not? a song is usually always changing and the reading off the multi will be max power?
or am i wrong?

worldind

iTrader: (17)

Well music itself isn't really measured in power... setting the gains with a true RMS multimeter will give you a good idea of where to adjust the gain to before you start clipping the amps. If an amp is set to do 1500 RMS at one ohm, during music you definitely won't always be at that impedance or frequency, but using an RMS figure will give a closer approximation to actual power you're getting than a peak figure. Maybe somebody else can elaborate on this.

If you're using a true RMS meter it won't be reading peak figures.

I don't think you have to worry about the dynamic nature of music, since the output voltage should vary on both amps at the same rate as one another if the gains are well-matched, and will fluctuate along with the different frequencies and amplitude of the music... regardless of whether you set the gain with an RMS multi or one that reads peak. The RMS voltage will just be a better representative of the output voltages the amps will actually produce. This probably makes no sense, I'm just rambling at this point.

Nathan Siy

Test tones are much easier to gain match the amps with.

Might want to just utilize a disc that contains test tones and put it on repeat. Then you can use your multimeter to measure the outputs of each amp to each coil and get them pretty close.

worldind

iTrader: (17)

Good point... thats something I forgot to mention. I think 60hz is the standard frequency. When I rambled about playing music I was thinking zinger meant after setting the gains (Via tone as pointed out)

Haunz

iTrader: (3)

gain matching is not a big deal unless the amplifier channels are set in parallel... thats not the case here so I probably wouldn't worry about it...

firehazzrd

okay i wrote the bottom first, read it over again, and I'm not sure if its correct. there is nothing measuring amperage so this could be completely wrong... can someone verify these points?


measure when car is running (14.4 +/- volts)

i wouldn't use 60Hz signal. I would scan through all of your frequencies and find the highest voltage. that way you can properly set your input gains to your subs RMS rating. you want to take the RMS of the sub and divide by 14.4 this will give you the voltage you are looking for on that same frequency that you used before. set your gain to that voltage. done.

also make sure your multimeter leads are clamped into you amps terminals tight, you don't want resistance if they are just barely touching.

tonez735

iTrader: (1)

Where can someone get a "test tones CD?"

Each amp will be bridged to one channel as well.... Any issues there? I wouldn't think so...

If you had the ACTUAL rating of the amp vs. the claimed rating, would you work with that as well? These amps are old school and way underrated.

I liked the idea of scanning through the frequency range to spot the peak and setting both amps the same. The sub will be picked such that it should take the real world power of both amps so RMS rating may not play here.

Thanks!!!

firehazzrd

go here Realm of Excursion

then go to downloads and download everything you can. i did 150Hz and down for subs on one cd, 60Hz and up for my speakers. and then all the extras on another cd. 3 total.