l7 making odd noise

[king ranch 5,000+ posts]

i will try a different computer tommororw to upload the video it wouldnt work for some reason

 

[pimpinmex803 10+ year member]

this is when i had the zx1500.

http://www.kicker.com/06/hookedup/05HUShow.cfm?ID=104068

 

[king ranch 5,000+ posts]

what should i look for and listen to when i free air and how much power should i give the sub while free airing

 

[Pantani 10+ year member]

12" L7 here, making the same noises...

 

[king ranch 5,000+ posts]

i wonder what it is

how much are u giving your and how much airspace do you have it in

i know its not bottoming out

 

[Pantani 10+ year member]

At first I thought maybe I was indeed feeding it too much power. I had it running off an Alpine MRV-1507 bridged with very modest gain settings. That amp is supposed to do 600@12v / 900@14.4v. I decided to step down the power to see if it would help to an Alpine MRV-T707 which is supposed to be 240@12v / 340@14.4, and that didn't solve the problem.

I am going to try and find some time to remove the speaker from the box and follow these guys suggestions and free air it to see if I can notice anything out of the ordinary, i.e. wiring actually hitting the cone, tinsel leads, or pretty much any other condition that might be "out of the ordinary".

Also, I have mine in a sealed enclosure. It has been years since I constructed it but I know I built it to Kicker recommendations for sealed so I'm thinking 1.25/1.5 ft^3

 

[king ranch 5,000+ posts]

yea no reason for these subs to be doing this and when free airing how much power do you give them and wat do u listen for or watch for and is there a certain tone u play of just normal music

 

[Pantani 10+ year member]

I'm no expert at all, but I am just going to be very careful with the volume control. I'm planning on playing something with a beat in it that will make it produce this noise while in the box, and starting low and slowly turning up the volume till I notice something. It's all guesswork to me. I'll be powering it off my smaller amp for the test I imagine.

 

[pimpinmex803 10+ year member]

even with one sub like this i hit a 142.7 on TL. it sounded really bad with test tone. im selling both my L7 12s and getting two alpine type r 12s