Gain Setting Tutorial

[FoxPro5 5,000+ posts]

does anybody have a link for test tones that work? i have tried the links in this thread and cant find any that work for me to download. im looking for a 50hz test tone.

http://www.ronelmm.com/tones/

 

[Johnny Drama 5,000+ posts]

i was looking at the JL tutorial and i noticed how it said turn off all processing on my headunit but the treble and bass and loudness ect. dont affect my subwoofer only my mids and highs which arent amped....should i still have to worry about it or just set my volume at the loudest i listen to and turn off the bass boost and lower all the SUBWOOFER settings on my headunit (if it helps i have a Premier DEH-670MP)

IMO you should set it with everything set how you have it daily.

If you have the bass at +4 and the trebble at +6 with a EQ set the gain with everything that way. If you go and start changing things you risk clipping.

 

[alphakenny1 10+ year member]

wow i just set my gains with an oscope the other day, probably the most effective way to set gains because you actually get to see the clipping.

 

[pjm2211 10+ year member]

I need to get my hands on an oscope....

 

[slideking 10+ year member]

I followed the guid at JL audio's site. When I stick the voltage meter in the speaker wire input, all i see on the meter is 0.00 with a negative sign to the left of the 0's. I can only asume that means its not getting a reading. I know the meter works. What am I doing wrong?

 

[Chevyaudio 5,000+ posts]

what do you have the DMM set on.

 

[slideking 10+ year member]

I select 200 DC(V with a line and 3 dots underneath).

 

[DBfan187 5,000+ posts]

that's DC, set it on AC ~

 

[Silver 10+ year member]

This is probably a stupid question.

When you turn the volume down on your HU, should your sub be in sync with the volume?

My bud can turn his HU down to 13 and the subwoofer still plays loud like it was turned up all the way, but after 13 the sub's volume goes down.

Could this be any help to correctly setting gain??

 

[SuperJETT 10+ year member]

This is probably a stupid question.
When you turn the volume down on your HU, should your sub be in sync with the volume?

My bud can turn his HU down to 13 and the subwoofer still plays loud like it was turned up all the way, but after 13 the sub's volume goes down.

Could this be any help to correctly setting gain??

He probably has his gain set too sensitive, meaning it maxes out at 13 instead of where it should. That also means he's probably clipping the hell out of it at max volume.

 

[Silver 10+ year member]

He probably has his gain set too sensitive, meaning it maxes out at 13 instead of where it should. That also means he's probably clipping the hell out of it at max volume.

So that sounds like a yes to me.

 

[lil azn 06 10+ year member]

The JL link is down from the first poster

 

[canadian_mofo 10+ year member]

if i have 70watt RMS 4ohm comp 6.5s and a 65 watt RMS amp would i have to worry about the gain so much? THis stuff is really confusing me. I dont have anything to measure the voltages and all that. Also there is another option knob to turn on my amp besides gain and bass boost has something to do with htz what would i set that too?

 

[alphakenny1 10+ year member]

The JL link is down from the first poster

yea that link is dead but just go to the JL website and you can find it yourself. i believe its under support and then look for the tutorial.

 

[headless 10+ year member]

Hey guys. I'm going to be setting up a new HU this weekend and will be re-setting all gains in my system (also new speakers). I've got a bit of a dilemma, though -- my mids/highs amplifier is easy, it's 2x140rms into 4ohms bridged. sqrt(140*4) = 23.66v to each speaker. The sub amp is a bit trickier; it's an old Punch 60DSM which is notoriously underrated. I can't really go off of 30w rms @ 4ohm, because the thing pushes 200+w.

Any ideas on how to get this set up not clipping, without an oscilloscope?

I was thinking i could burn 2 test tone tracks -- one at 0DBFS, and another at perhaps -1 or -2 DBFS. Play tone @ full 0DBFS, measure voltage at output poles to speakers on amp. Play tone -2dfbs. Measure voltage. If voltage is the same for both tones, it got clipped. If voltage for tone 1 is greater than tone 2, no clipping. Is this the right idea? Sorry if i just showed i am completely clueless //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif