Gain Setting Question

[devdog 10+ year member]

Just got an AP15001D and i was just curious on how to set the gain and all the other things. EG: The Amp has a gain, LPF, Subsonic, Bass Boost Freq, and Bass Boost knobs. While on my headunit i have the volume, bass, and subwoofer settings. Any help would be appreciated.

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[mast240 10+ year member]

We are going to start referring these questions to this thread here....

http://www.caraudio.com/forums/general-discussion/532425-new-car-audio-read-first.html

it is all in there

 

[mast240 10+ year member]

also, LPF is going to be your upper cut off for sub frequency, subsonic is the lower, and bass boost shouldn't be used

 

[Fi_ 10+ year member]

FIRST AND FOREMOST MAKE SURE YOUR CAR IS STARTED WHEN YOU DO ALL OF THIS

His explanation is far better but in short just get a tone disc with -3dB 25,50,70-75hz tones turn all of your headunits filters wide open meaning: LFP all the up and Subsonic all the way down do that with your amplifier as well and turn your gain down start your car then you'll want a Digital Multimeter DMM for short and set it to AC voltage and unplug your subwoofers from the amplifier then put the Positive from the DMM on the positive for your speaker terminal and then you put the Negative on the Negative terminal screw them in. One you have done that set your headunit volume at about 3/4 volume (close to preout rating, if you can find the preout voltage for your headunits RCA outputs that will help a lot.) Then you will play the 50HZ -3DB tone and turn the gain up until the multimeter matches voltage you need on this chart:

So say if you're running 100w @ 4 ohms you would want 20v on the chart... I usually turn it up about 5v extra depending on power/voltage drop because of the -3db but you don't have to that's just me. Anyways after that play the 70-75hz tone and then turn the knob down on the LPF until the voltage stops dropping that's where you want your LPF. Then you want to do the same with Subsonic put on the 25hz tone and turn the Subsonic up until the voltage stops thats where your Subsonic needs to be.

One you do all of that put your headunit settings back where they were and NEVER TOUCH BASS BOOST like mast said.

Also if you want you can save the Image and print it out and read the instructions like that but it doesn't really explain in depth like mast or I have.

 

[mast240 10+ year member]

going to steal that image for my write up thread... i was looking all over for it when i was writing it earlier, lol

 

[Fi_ 10+ year member]

going to steal that image for my write up thread... i was looking all over for it when i was writing it earlier, lol

Have at it man it's a pain in the *** to find lol

 

[devdog 10+ year member]

just curious, why no bass boost?

 

[Fi_ 10+ year member]

just curious, why no bass boost?

it adds db boost to your output and mostly just distorts signal it's only really a last resort if you need that extra power and your headunit doesn't have a good preout other than that it's a big no no and 90% of the time isn't needed.