New thread same topic

[Professor Fate 10+ year member]

I have a 1200w at 1 ohm amp. One 4 ohm duel voice coil sub, hooked up in parallel.(= 2 ohms right). I have a DEH-960mp HU, with 6.5v pre-outs I believe. Can you tell me what voltage I should have my gain at. Is that all the system specs you need to give the right answer? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

I read the tutorial and a ton of threads, Its just to much to take in. Once the answer is giving to me with my system I'm sure it will all make sence.

Click to read more...

 

[supa_c 5,000+ posts]

.2V to 8V

Set it close to 8V

 

[iceteebone 5,000+ posts]

I have a 1200w at 1 ohm amp. One 4 ohm duel voice coil sub, hooked up in parallel.(= 2 ohms right). I have a DEH-960mp HU, with 6.5v pre-outs I believe. Can you tell me what voltage I should have my gain at. Is that all the system specs you need to give the right answer? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif
I read the tutorial and a ton of threads, Its just to much to take in. Once the answer is giving to me with my system I'm sure it will all make sence.

what is your amp rated at 2 ohms? all you do is take you power, multiply it by the ohm load, and take that number and find the square root of that number. that is you voltage. disconnect you sub. set your headunit at your normal listening levels. i recommend setting your sub level to zero. play a 50 hz. test tone. take a digital multi-meter and place the probes on the speaker terminals on the amp. By the way when you start, your gains should be turned all the way down. then keep turning up the gain until you reach the voltage you figured out earlier. then they are set. hope this helps.

 

[Professor Fate 10+ year member]

.2V to 8VSet it close to 8V

I got 34.6v(sqrt 1200). what is supa talking about?

 

[iceteebone 5,000+ posts]

I got 34.6v(sqrt 1200). what is supa talking about?

the problem with that number is you are not running it at 1 ohm. lets say if the amp puts out 700 watts rms @ 2 ohms, you would take 700 multiply it by 2 and find the square root. supa is talking about matching the level with your headunits output which is the whole point of gains. you headunit puts out 6.5 volts so you try to find where 6.5 volts would be on your amp's gain. the problem with that though is your rca's will clip before 6.5 volts. the ultimate way to set gains is with an O scope. the dmm way works well also.

 

[Professor Fate 10+ year member]

It just seems weird that I would want 6.5v, but sould be happy with 34.6. that seems like a big gap.

 

[iceteebone 5,000+ posts]

It just seems weird that I would want 6.5v, but sould be happy with 34.6. that seems like a big gap.

i think you are confused. the 34.6 would be what you would get from your multimeter. 6.5 volts is what you would set you dial to on your amp. take a look at this: http://jlaudio.com/tutorials/index.html# click on the second link

 

[Professor Fate 10+ year member]

I don't have a volt adjuster on my amp. What would it be called on an amp. I believe I have gain/level, sub sonic, low pass, and phase. I guess it has a pre-set volt that the amp would like. Lets hope its around 6.5. So all that aside put the amp outputs to 34.6, and that should be as good enough. Thank you for the help.

 

[iceteebone 5,000+ posts]

I don't have a volt adjuster on my amp. What would it be called on an amp. I believe I have gain/level, sub sonic, low pass, and phase. I guess it has a pre-set volt that the amp would like. Lets hope its around 6.5. So all that aside put the amp outputs to 34.6, and that should be as good enough. Thank you for the help.

your gain/level is adjusted by volts. the numbers on the gain control are volts.

 

[squeak9798 5,000+ posts]

You measure that 34.6V at the amps speaker outputs, and adjust the gain/level until you get 34.6V on the speaker outputs.

 

[JimJ 5,000+ posts]

the JL tutorial really doesn't make it much easier //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Professor Fate 10+ year member]

the problem with that number is you are not running it at 1 ohm. lets say if the amp puts out 700 watts rms @ 2 ohms, you would take 700 multiply it by 2 and find the square root. supa is talking about matching the level with your headunits output which is the whole point of gains. you headunit puts out 6.5 volts so you try to find where 6.5 volts would be on your amp's gain. the problem with that though is your rca's will clip before 6.5 volts. the ultimate way to set gains is with an O scope. the dmm way works well also.

My amp Im assuming, puts out 600w @ 2 ohms, so 600 times 2 = 1200. sqrt 1200= 34.6.... whats wrong with that #. sqrt or 1200w @1ohm = sqrt 600w @2ohm.