Gain Setting Tutorial

[ANeonRider 10+ year member]

The voltage range u are using is the problem. You should use the 200V AC range.

 

[Chris02NeonSXT 10+ year member]

I have two different voltage sections of my dmm. One is a V with a dash and 3-4 dots under the dash. The other is a V~

 

[ANeonRider 10+ year member]

V~ is the AC voltage setting.

 

[-CT- 10+ year member]

Level = Gain ... start at 5 volts (lowest, least sensitive setting) and work your way "up" ...For 6x9s, don't use boost ...

HPF - Start at 250 Hz and slowly turn it down until the speakers start to distort.

Subsonic isn't needed for 6x9s ... Set to 10 Hz if you can't turn it off

ok so would i do one at a time or set one then set the other? for example when i set the hpf shud everything else be minimum and when i set gain shud everything else be minimum?

 

[Strecker25 10+ year member]

just wondering if this formula would hold true to test the true output of my decks internal amp, its rated at 25w rms so Sqrt(25x4) = 10v should be at the speaker lead correct?

 

[mbacis 10+ year member]

OK, I'm a bit perplexed. I was running my ID8 (rated at 150W) of my Jensen amp (rated at 170W) and I set the gains based on how it sounded. I got that thing pounding pretty hard, sounded great, never heard distortion. Sub died, one of the coils either broke or burned out.

I got the sub replaced and now want to run it off my Profile CL640 (225W). I went through the gain setting procedure with a 50Hz test tone and set my gains to an output of ~175W (26.5V) with the sub level at 10 (max), volume about 3/4, and my equalizer off. Now I can't even hear the sub. With the music I play, mostly stuff like DMB and Rusted Root, I can only hear the sub if I open my trunk and listen from back their, while the tone will play very loudly.

Now I'm afraid to set them by ear again because I'm not sure if I blew my first sub by going that route, but by following the tutorial I might as well not have the sub at all. What should I do? By the way, the sub's mounted in ~0.3cuft sealed box and wired at 4ohms.

 

[IgnoreMe 5,000+ posts]

JL says to use a 1k hz test tone for the mids. i checked the test tone page, it only goes up to 80hz. anyone got a link for a 1k hz tone?

 

[ANeonRider 10+ year member]

http://www.caraudio.com/vb/showthread.php?t=69831

 

[JoseMCeee 10+ year member]

If i have a HK-1997 amp that puts out 1200X1 into 2ohm and I have 2 Solo barics wired together to final impedance of 2 ohm that handle 600 wats each. What would be my voltage?

sqrt(2*1200)?

Also does anyone know where I can get a 50 hz cd to test subs

??????????????

 

[nismboy6986 10+ year member]

just to make sure i did the formula right since i am very forgetful when it comes to math, i would multiply watts times resistance then find the square root of the product so in my case it would be 1000x1= 1000 sqrt1000= 31.62 volts so when my bx1000d is wired to 1ohm it would put out 31.62 volts at full power.

 

[dannyboy]

OK so I have 100x2 amp going into a 4 ohm load so my voltage should be 20v. Only problem is @ 20v my comps are too loud compared to my sub. I need to get a bigger sub amp. So I turned down the gain on the comp amp to match the output of the sub amp. I took a measurment w/ a 1k 0db test tone and it measured 12.25volts. My question is does that mean that the amp is putting out 40 watts? I got that number by doing the formula backwards . Thanks in advance.

 

[OOBE 10+ year member]

I did it on my ZR600...48.9 volt. I didn't have access to a Fluke at work, so I bought a $10 analog GE multimeter. I got the needle close to 50. I have my 2 JBL Loud and Clear 10" bridged. Now they sound unbelievable for such a cheap speaker. I'm doing the big 3 tomorrow morning. It's weird, I already knew this procedure by common sense and performed it on my other cars but didn't know it was called the big 3 and that most people didn't know, hehe. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[bitwise 10+ year member]

I just tried setting the gain for a new cadence amplifier I bought (z8000 175x2RMS @ 4 Ohm). I used 37.4 as my target voltage. I started by playing a 1Khz test tone with volume close to maxed. My headunit is a Pioneer Premier 940MP. It has 6.5v preouts, and I know the amp can handle up to 10v inputs. Well I was turning the gain higher and higher and approaching the target voltage. I went as far as I could go on the gain dial, and It ended at 33.6v.

What should I do about this?

 

[bitwise 10+ year member]

AHA! Thanks JMac //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif I am running it in stereo. I was using the total power @ 4ohm, I realize now that I should have done it per channel. Thanks for the tip, now Im gonna go fix it and give another listen //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

ttyl

 

[TwiZtDBIA 10+ year member]

got a question.... do i unhook the components too.... just asking so i don't **** something up... better to ask than wreck something...