DD2515a & QCA3000D Help!

[RidinSwangaz 10+ year member]

Okay guy's, I have a DD 2515a wired to a QCA3000D it's doing about 1200@1 But the sub is set for 750@1 3k peek, What should I set the gain on to prevent any clipping/overheating I do not, Nor can access as oscilloscope. I looked threw a few threads & couldn't find any real help.

All help is appreciated, Thank you.

Click to read more...

 

[MONSONwarrior Premium Member]

use a DMM to set the gains. it's AC voltage and the formula is voltage=sqrt(rms x impendence)

 

[RidinSwangaz 10+ year member]

use a DMM to set the gains. it's AC voltage and the formula is voltage=sqrt(rms x impendence)

I've got a DMM, How do I set the gains with it?

 

[Bumpin' Goalie 10+ year member]

I've got a DMM, How do I set the gains with it?

Voltage= SquareRoot(rms x impedence)

//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Someone give this guy an example please //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[mossberg385t 10+ year member]

use the dmm to set it to 34.64 V on a test tone, something like 50 hz or so

 

[RidinSwangaz 10+ year member]

Voltage= SquareRoot(rms x impedence)
//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Someone give this guy an example please //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Yeah somebody do that lol.

 

[RidinSwangaz 10+ year member]

use the dmm to set it to 34.64 V on a test tone, something like 50 hz or so

I still am not following, Lol, Don't get frustrated, I'll listen unlike others.

 

[Bumpin' Goalie 10+ year member]

I still am not following, Lol, Don't get frustrated, I'll listen unlike others.

You have a DMM, yes?

Let me google that for you

//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[hatedonmostly 5,000+ posts]

Wattage

//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[modskwod 10+ year member]

Turn the gain all the way down on the amp. Then begin playing a 50-60 hz test tone recorded at 0db through the sub. Turn the HU up to where your max listening level is, then get out your DMM and turn the knob to AC voltage (which is marked by "V~" on most dmm's). Then put the positive lead on the positive speaker output and the negative lead on the negative output. Slowly turn the gain knob until the voltage read is 34.64. Voila

 

[RidinSwangaz 10+ year member]

Turn the gain all the way down on the amp. Then begin playing a 50-60 hz test tone recorded at 0db through the sub. Turn the HU up to where your max listening level is, then get out your DMM and turn the knob to AC voltage (which is marked by "V~" on most dmm's). Then put the positive lead on the positive speaker output and the negative lead on the negative output. Slowly turn the gain knob until the voltage read is 34.64. Voila

So 34.64 is perfect? I understand what you are saying now, It just needs to be at 34.64?

 

[Apollo220 10+ year member]

Turn the gain all the way down on the amp. Then begin playing a 50-60 hz test tone recorded at 0db through the sub. Turn the HU up to where your max listening level is, then get out your DMM and turn the knob to AC voltage (which is marked by "V~" on most dmm's). Then put the positive lead on the positive speaker output and the negative lead on the negative output. Slowly turn the gain knob until the voltage read is 34.64. Voila

if i had a sub with 2000 rms and was looking to tune it would i still want the voltage to be at 34.64 ?? tuned

 

[Apollo220 10+ year member]

oh and it would be at 2 ohm

 

[RidinSwangaz 10+ year member]

Turn the gain all the way down on the amp. Then begin playing a 50-60 hz test tone recorded at 0db through the sub. Turn the HU up to where your max listening level is, then get out your DMM and turn the knob to AC voltage (which is marked by "V~" on most dmm's). Then put the positive lead on the positive speaker output and the negative lead on the negative output. Slowly turn the gain knob until the voltage read is 34.64. Voila

Let me make sure I got this right.

1200 @ 1 with a sub 750@1 RMS is 34.64.

Gain all the way down, Leave HU alone?

Play a test tone such as 50 Multiple times,adjust gain accordingly until meter says 34.64?

 

[Apollo220 10+ year member]

u would want a tone that last that last like atleast 30 seconds or so instead of repeating it . im sure thats what he meant