Subwoofer cracks when there's too much bass?

louiey370z

Could this be because it's in the open space in the trunk?? Cause when the song has too much bass, it cracks and it really ***** the vibe up

Subwoofer: Rocksford Fosgate
Amp: Power Acoustik

Also seems like the crack only happens if I have windows rolled down. It happens very rarely if I have my windows rolled up, however, still there's a cracking noise even with windows up. Could it be due to the poor subwoofer or the amp

Video; https://youtu.be/Jj8oxEG-F_E

Kazzan11236

Didnt see the cracking but i have 2 rockford fosgate T1s 12s, in a box wayyy too small with a rockford p1000x1bd... Never cracks, and sounds better with the windows down becuz the hatch becomes its own box...

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louiey370z

You can't see it but u can hear it

BuddyLee

Perhaps the polarity is reversed?

louiey370z

I don't believe so. Attempted to change both sides and no luck

RonRizz

whats happening is you are pushing the sub to its maximum mechanical excursion. you will destroy it if you continue to do so. Im only guessing when I say that it only does it when your windows are open because you probably turn the volume up louder to overcome road noise!!! lol.
actually, the cabin pressure will change with windows up/down albeit slightly, and this could be adding to your troubles.
Subwoofer enclosure design is an art, and a sub that is in a box that is not the proper size will not play efficiently. Also, your amplifier gains must be set at the proper levels, or you are introducing distortion, which is also a no-no...
Lastly, is your subwoofer rated to handle the power that your amplifier is feeding it?????
There are many variables that determine the performance of a loudspeaker...not just whether the sub or amp is crap.

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SouthArk370Z

I'm with RonRizz - sounds like the coil is over-traveling and hitting the frame. This can destroy the speaker very quickly. When the windows are down, there is less resistance to cone movement which exacerbates the problem. Either cut some power to the sub or get a sub that can handle the power.

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RonRizz

. Lol... I do that in the shower sometimes......

__________________
P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals

Kazzan11236

Like a rockford T1

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SouthArk370Z

Are you familiar with what amplifier clipping sounds like? Coil over-travel is the mechanical equivalent of that. It doesn't sound exactly the same (you only have physical contact on the inward stroke) but similar.

There are a few other things that could cause similar sounds but they usually make buzzing/grating/other noises:
Breaks/tears in the coil assembly, cone, or suspension. If you have been banging the coil against the frame, any of those could be damaged.
Check the wires from the terminals to the cone and make sure they aren't hitting anything and are still glued to the cone (latter will usually have an effect at lower volume levels, also).

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