Need help tuning 2 12 cvr and zx750.1 amp

[I<3JDM]

just installed them now I think I need to tune them.

I know you turn the knobs to tune them... so dont be a smart ass.
>.>
but all seriousness how do I tune it to the best sound.
i have a bass boost, x-over, and gain knobs.. and some switch on the side thats says something about bass...

and its all hooked to my stock deck. bass on the stock deck is -6 and treb at +6

[HsOffRoad]

Start by turning the gain on the amp all the way down, and adjust everything else either flat, off, or to "0". That means bass, treble, any kind of EQs or processing, loudness, bass boost, etc. on both the amplfier and the head unit. Set the amplifer's low pass crossover at 80hz.

From here, you can either try to tune it by ear, or use math and a multimeter. Either way, set the head unit at a little below 3/4 volume. If you are tuning by ear, play a 50hz 0 dB sine wave on repeat. Slowly turn the gain on the amp up until you begin to notice any kind of distortion, then back it off a hair from there.

If you have a multimeter, you can do the math to determine the proper output voltage. This is obviously a better way to do things.

The formula is:

The Square Root of (RMS Watts per channel X Ohms)

Meaning, that if the amp is supposed to make 750W RMS into 2 ohms, and you are using a speaker wired for a 2 ohm load, then:

The Square Root of (750 X 2) = 38.7 V

In this case, you would want to turn the gain until the multimeter read 38 Volts.

To do this, first unhook the speaker leads, then play the same 0dB 50Hz tone on repeat, at a little below 3/4 volume on the head unit. Connect the black lead on the voltmeter to the amp ground, and the red lead to the speaker "+" terminal on the amp. Set the voltmeter to "AC Volts". Now slowly turn the gain knob until you get a reading of 38 Volts. It will be nearly impossible to get it exact - just get it as close as possible and call it good. Unhook everything, your gain is now set correctly.

From here, you can adjust the low pass crossover frequency on the amp to suit your taste - but leave the other adjustments flat.

If you don't have a 50hz 0dB sine wave, you can download one here for free:

Realm of Excursion


Hans

[I<3JDM]

woah thanks alot. i would rep you if i knew how to.