too much vibration;not deep enough sound

[ajm 10+ year member]

I believe this is due to the amp settings, box freqency, or having 10's but I thought id give it a try in this section first. I have 3 10" L7's in a 3.5 cu. ft box tuned to 37hz. Theyre being powered by a power acoustik a3000db with gain and bass boost set a bit below half way, frequency ~80-90hz and phase switch at 180. The headunit is a panasonic 7301u I use the flat eq setting and have bass set at about 3/4 the way up,the sub-volume setting maxed out low filter is set to 80hz and high filter is set to 180hz.

Im pretty happy with the way they sound when it comes to spl but heres my problem. Im getting more of a vibration sound rather than a low more bass like sound. Especially when listening to rock it seems like the subs just vibrate rather than actually hit some deep bass notes. If it makes any sense I get more of a BUUURRRRRRR sound than a BOOM. I have played with the volume settings on the headunit quite a bit and still no luck. Anyone have some suggestions? Thanks.

Also im pretty sure its not the truck actually vibrating because even at moderate sound levels when there should be some reasonably low bass its just more of a burrrrrrr sound.

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[crazy4ozs]

DynoMat...

 

[ajm 10+ year member]

Its not the truck vibrating....Its the sound that the subs are putting out.

 

[crazy4ozs]

oh...are they clipping? or mabye being over/under powered...

 

[crazy4ozs]

are they ported or sealed becuase ur box looks preety crammed on airspace...also are they sharing airspace?

 

[Jdizzle 10+ year member]

are they ported or sealed becuase ur box looks preety crammed on airspace...also are they sharing airspace?

x2....more info

 

[ajm 10+ year member]

Yes theyre sharing air space, box is ported. Power wise. They should be getting roughly what they need. The amp is somewhat overrated at 2300 rms @ 1ohm, and 1800rms @ 2ohms. Theyre wired to 1.34ohm and need a total of 1800. As for the clipping they dont sound distorted...then again I have some pretty bad hearing. They just dont seem to give a deep sounding output. Even if I play a country song or something Id expect a nice little bump from its just a slight bump carried out by burrrrr.

The box is as big as it can be. So if its all that crammed maybe some polyfill will help? Im also thinking it might be because the bass boost is set to high bc when I had it somewhat turned down before it seemed to not vibrate as much the only problem is its a pain in the *** for me to tune my stuff. Im in an apt and all of the neighbors constantly complain about me as it is. So turning up the music will just give them another reason to piss and moan.

 

[helotaxi 5,000+ posts]

Are you sure about the box tuning? It sounds like you are trying to play notes below the tuning freq of the box. This basically gets you lots of cone movement and next to no output.

 

[xpl0it 10+ year member]

I've had the same problem. I only get this problem with I listen to crappy bass, for example, Fort Minor-The Rising Tied. That CD has HORRIBLE bass, makes it sound like it's just vibrating back there. Then I quickly change it to T.I.-Be Easy and my brain shakes.

 

[ajm 10+ year member]

I might have ruled out the problem today. I played a song ive never played before and the sound went away, and the crossover frequency was set lower than what I had though. It seems to be a bit deeper now. As for the tuning frequency. Thats what the guy who designed it said as well as the screenshots he sent me.