Quick sound diagnosis requested (1 Viewer)

[VinhT]

I have the weak Parts Express plate amp with the default boost, and when my sub is playing at high volumes, there's a disturbing noise coming from the woofer (Titanic 10" original). It isn't a loud metallic clanking, so I'm assuming the woofer isn't bottoming out. The noise sounds like a flag flapping in a strong wind. Therefore, I'm hoping it's just the amp clipping, which can easily be remedied by removing the boost.

Thoughts anyone?
-Vinh

 

[AlexKunec]

Which Parts Express amp?
Whats the enclosure like? (Volume, Ported?, Tuning FQ)

 

[AlexKunec]

It could be the wire leads slapping the back of the cone.

 

[VinhT]

My current sub:
Woofer: Titanic 10" original from Parts Express, rated at 250W, but only 12mm Xmax
Passive radiator: Peerless XLS 10" from Parts Express 297-606
Plate amp: Parts Express 300-792, 150W 4ohm
Enclosure: 2 cubic feet, which becomes about 1.7 after everything is added

I removed the bass boost from the plate amp, but the problem still persists although not as much. When the noise occurs, the driver is moving very rapidly in a blurring motion, thrusting forward out of the enclosure. Only the woofer makes the noise, I haven't had any problems with the passive radiator. It's almost as if the cone is moving so fast that the rubber surround is being crumpled or something.

If it is the wire leads slapping the back of the cone, how would I fix this?

 

[Stacey_V]

Vinh...
I don't know exactly what this means, but I've heard that a noise like yours may be the driver "unloading". I think it means that your driver is being forced to play lower than it's tuned frequency. Can anyone else suport or dispute this?
Regards,
Stacey

 

[AlexKunec]

My 12" Shiva makes the same noise when i cracnk it past about 1/3 volume, on a 250w plate amp.

Stacey, I see you are from Alberta, as am I, whereabouts do you live?

 

[Stacey_V]

Hi Alex....
Born and raised in Calgary.
What about you?

 

[AlexKunec]

Small town kinda between Lloyd and Edmonton