Hi, I have had my BTL 12 for several weeks now. Its fully loaded and only receiving around 1000 watts rms (PDX 1.1000). The enclosure is 3 cubes after displacement at 34 hz. On certain notes, i hear a popping noise. The notes are almost always higher notes. The spiders and leads look fine, but i dont have much experience with them. Is it possible that i am reaching the mechanical limits of the sub in this box at less than half power? Amp is not clipping to my knowledge. Voltage is stable when the noise sounds (less than half gain, no bass boost). Oh, and the popping is only heard at half volume plus. The sound sounds like its coming from under the dust cap. Any ideas?

Hi, I have had my BTL 12 for several weeks now. Its fully loaded and only receiving around 1000 watts rms (PDX 1.1000). The enclosure is 3 cubes after displacement at 34 hz. On certain notes, i hear a popping noise. The notes are almost always higher notes. The spiders and leads look fine, but i dont have much experience with them. Is it possible that i am reaching the mechanical limits of the sub in this box at less than half power? Amp is not clipping to my knowledge. Voltage is stable when the noise sounds (less than half gain, no bass boost). Oh, and the popping is only heard at half volume plus. The sound sounds like its coming from under the dust cap. Any ideas?

can you post a video of this popping noise happening?

Is the dust cap glue failing?

I don't know if the glue is failing or not. It looks ok but the sound is def coming from under dust cap. I have taken a video of the sub while in and out of the box, but it was with my phone so the quality sucks. The popping is not extremely harsh, but is very noticeable. Could the larger box have made this happen?

At that power level probably not.

Post the video so we can help you more.

i bet its a loose piece of soldier that broke off under the dustcap

i bet its a loose piece of soldier that broke off under the dustcap

Not possible.

Regardless you probably slammed the cone assembly into the basket on a note far below tuning which likely broke something. Those amps do not have adjustable subsonic filters...it's on or off at 25Hz I believe.

i bet its a loose piece of soldier that broke off under the dustcap

Not possible.

Regardless you probably slammed the cone assembly into the basket on a note far below tuning which likely broke something. Those amps do not have adjustable subsonic filters...it's on or off at 25Hz I believe.

The subsonic filter is 0, 15, or 30. I have it set at 30, which is 4 hz below tunning. I'll try to get a better quality video soon. So has anyone else had this problem before?

Ok, these are the crappy quality phone videos that probably wont help. I'm working on using a better camera. Turn volume down a little cause it distorts bad.

If you take another video, hold the camera still for 3-4 seconds at a time. hard to see what is going on with the camera constantly moving. . .

Inspect all of the joints to make sure they are ok - Where the spider sits on the basket and where the voice coil is attached to the cone.

If you look in the vent holes where the basket meets the top plate, does the voice coil look ok?