Quick input on setting my gain (sub + amp)

[eXistence 10+ year member]

Ok I have a pioneer gm d 9601 mono amp and a alpine type R 10 500 watt RMS Dual coil 4 ohm wired into a 2 ohm. I used two apps on my phone to find the voltage I need to set my gain from the amp. I used this one app called Audio Tool Kit Pro. In there it asks on "amp gain settings" what the amp rating is "RMS". I put "800". Then it asks for Amp load which I put "2" since I am running it in 2ohms. I then hit calculate and it gives me my number "40 volts AC". I then use another app called True Tone that gives me my tones to play through my speakers in order to set my gain. I go ahead and hook up my DMM to my amp. Put a tone of 50hz on and play. I turn the gain up until I hit 40 volts. Which wasn't very much to move. Btw my headunit goes to 35 volume and I left it at 26 which is right at 75%. Its Kenwood DDX 719.

Now my question. Is this to much power for the amp and or sub? I don't want to fry the amp or anything or blow my sub. Another thing is I put the DMM into ohms and tested my sub and it was reading 2.5 ohms. A while back it use to read 1.8 ohms. The sub is pretty old as well.

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[eXistence 10+ year member]

86 view and no replies? //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[trumpet 5,000+ posts]

Did you use the same meter and the same leads to test the impedance of the sub? Was there any wire added in that wasn't in the circuit when it measured 1.8 ohms?

As long as you're careful with the volume and you don't boost the bass you should be ok. This method for setting gains isn't guaranteeing anything, but it's better than just guessing. The actual power output will vary quite a bit and it will normally be much lower than 800W.

 

[RokintypeRs 10+ year member]

^+1. I usually use an O-scope to tune mine and get it to where I like it. Honestly your probably doing 500 watts rms if even that. I would just turn the volume up to 22 and see how it sounds from there. If its too quiet, turn it up a tad. If I'm tuning without the instrument, I usually set the amp to about halfway gain with +1 dB and see how it sounds because honestly the dB on any amp should not surpass its halfway mark. If it's a kenwood 719 then your headunit probably puts out 4v THATS A GUESS based on the model. Confirm your findings by playing a song that puts both a positive and negative beat or use your app and set it to different frequencies. I would personally go like 35 instead of 40hz to get the best sound and go from there. Up to you IMO.