hmmm...

[cappy72 10+ year member]

I have recently had a change of heart with the XXX 12 that I have. Let me explain.... When I first purchased the sub and installed it I was very upset about how it was preforming. I bought a premade ported box, after I screwed up my built box (I made it 1" too big, then the tee nuts broke it between the spacers so I trashed the box). I didnt like the way the quality of the ported box was so I decided to take my dual 12 box and chop it in half... this worked out well and I sealed the joints again to make sure everything was leak proof.

well I installed the sub into that box and then it started rattling, I was so pissed. At the time it would seem that everytime I touched the cone it would stop rattling. I was able to adjust the gain to a really low setting and prevent the rattling.

TODAY I was installing my CDT comps from djdillidon and I realized that it was not my sub that was rattling at all, it was my lid that goes over my spare tire... it had seemed that everytime I pushed the cone the sub would stop rattling when infact I had my hand on the lid, and that prevented the lid from rattling.... So today I cranked up my gains, threw in a test tone and BOOM.... the XXX is banging...

I am very happy with the XXX now...

Click to read more...

 

[JimJ 5,000+ posts]

You did properly set the gains for your desired output power, correct? //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif Because if you simply cranked the gains indiscriminately, that XXX may not have a very long or healthy life...

 

[netherland24 5,000+ posts]

yay now what are u gona do now with that big fat waste of a post?

 

[PhatTonyDeMarco 5,000+ posts]

How about a nicely designed ported enclosure and you can see her shine? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[cappy72 10+ year member]

the gains are onpoint Jack... that is one of the reasons why I used the test tone cd... I needed to be able to clearly hear the distortion and I couldnt. Once I got the base level with the test tone I re adjusted it for normal music...

 

[PhatTonyDeMarco 5,000+ posts]

the gains are onpoint Jack... that is one of the reasons why I used the test tone cd... I needed to be able to clearly hear the distortion and I couldnt. Once I got the base level with the test tone I re adjusted it for normal music...

It's nearly impossible to detect distortion with subsonic tones. I reccomend getting a DMM so you dont hurt the big guy...

 

[cappy72 10+ year member]

I would love to port it again but my time restraints me from doing this. I might have to think about it in the spring.

 

[JimJ 5,000+ posts]

It's nearly impossible to detect distortion with subsonic tones. I reccomend getting a DMM so you dont hurt the big guy...

Especially with XBL^2 motored drivers...you could run the thing right up to clipping and never notice it before it blows.

 

[cappy72 10+ year member]

It's nearly impossible to detect distortion with subsonic tones. I reccomend getting a DMM so you dont hurt the big guy...

well I used a 60hz tone. I was able to hear it start to sound messy and that is when I lowered it...

It is said that test tones create more stress on the sub than normal music, so I adjusted it a little higher once I got the music on and I was able to use the test tone setting as a base-line to where distortion started

 

[PhatTonyDeMarco 5,000+ posts]

well I used a 60hz tone. I was able to hear it start to sound messy and that is when I lowered it...
It is said that test tones create more stress on the sub than normal music, so I adjusted it a little higher once I got the music on and I was able to use the test tone setting as a base-line to where distortion started

Well... I wouldnt do it that way, but if it lasts then I shall shake your hand.

 

[cappy72 10+ year member]

what do you recommend ??? I can not use a dmm to set it because I have a diamond d5 1200.1

meaning the amp is set up with 2 channels but the bridge internally... so when I take a dmm reading I get like .3 or something

 

[SSS 18734 5,000+ posts]

well I used a 60hz tone. I was able to hear it start to sound messy and that is when I lowered it...
It is said that test tones create more stress on the sub than normal music, so I adjusted it a little higher once I got the music on and I was able to use the test tone setting as a base-line to where distortion started

I usually set my gains below the targeted voltage... for example if I need 20 volts, ill set it to 18 or so so that I can play around with equalizers and still be safe. Don't set your gains higher than your target voltage... its not really worth the risk.

 

[JimJ 5,000+ posts]

what do you recommend ??? I can not use a dmm to set it because I have a diamond d5 1200.1
meaning the amp is set up with 2 channels but the bridge internally... so when I take a dmm reading I get like .3 or something

Sounds like you're measuring DC resistance instead of AC voltage...

 

[SSS 18734 5,000+ posts]

what do you recommend ??? I can not use a dmm to set it because I have a diamond d5 1200.1
meaning the amp is set up with 2 channels but the bridge internally... so when I take a dmm reading I get like .3 or something

right... its a monoblock amp, so both channels are essentially the same one. are you sure you know how to properly use the DMM?

 

[cappy72 10+ year member]

I didnt think I was but I can go check real quick