posted
I've got a stroker 12 that's in the correct ported box and everything and is run off a MTX 2300x. Whenever I turn it up very loud, it makes nasty banging sounds, like it's bottoming out or getting too much power. This can't be right, because they're rated at like 1200 watts RMS, the amps putting out maybe 900. I bought the sub used, is there a chance it's messed up? Also, does anyone know what the little screw on the center pole thing is for? Could it have something to do with it? Thanks.
Josh
Posts: 110 | From: BG, Missouri, USA | Registered: Jun 1999
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posted
The power handling of a sub in a ported box goes down real fast below the tuning frequency of the box. Below the tuning frequency the sub doesn't have anything controlling the cone movement and with 900 watts this can bottom out a sub pretty quick. The 1200 watts probably refers to the thermal power handling of the speaker. My recommendation is to use a subsonic filter with a crossover frequency at the tuning freq of the box. Or build a new box tuned to a lower frequency.
posted
No, I'm pretty sure the box isn't the problem. The stroker only bottoms out when playing stuff that is really punchy or is hard to keep up with, or when I turn the gains up. It will play low stuff really well, and anything that's rumbling, shaking bass works ok, but the mid-upper range is not there at all. Any ideas?
Josh
Posts: 110 | From: BG, Missouri, USA | Registered: Jun 1999
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posted
Umm jc2 is probably right. Im taking that you are listening to normal music when you hear the sub "bottom out" If you grab a test tone cd and play a 20hz tone maybe it will do the same thing. Only other thing it may be is you are driving the amp into clipping which will make that noise.
posted
hey i got the same amp pushing a kenwood db+ 12" rated at 1000 wts max and am running it 1/2 - 3/4 gain any more gain and my sub does the same thing but only on certain tones turn it down a lil bit and adjust the eq setting witch is the boost at 40hz from 0 to 16 db+ i did and i can play a sine sweep on a tester so loud that it tweaks with your voice and thats not even full vol and my speaker doesnt sound odd till it gets to the higher freq range.....just play with those two knobs a lil and try the freq knob also itll work dont worry and when you hear that noise TURN IT DOWN or say good bye to that speaker after a while
posted
Sealed boxes don't have a tuning frequency like a ported box does. There is however a frequency that the sub/box combo will be most efficient at, and that frequency can be boosted to gain maximum SPL out of a sub in a sealed system. If you're lucky enough to have a sub system that is efficient in the range of the transfer function of your vehicle, you can squeeze maximum SPL out of the system with fewer watts than otherwise. Each sealed (and ported for that matter) system will have a frequency that it's most efficient at...hope that clears it up.
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