PDA

View Full Version : how to make a LOUD sealed box



assassyn
02-03-2010, 08:24 AM
you guys have any idea's on how to make a loud sealed box. My kicker l7's sound great in a 1.75 cu sealed box x2

but in the same box ported, they are loud as hell but dont sound great. so I want to do a loud sealed box, maybe a really big sealed box???? what is you .02 on this.

I like the quick respones of a seald box , I litsin to country, rock, oldies, gangster rap

Cabin_Pressure
02-03-2010, 08:25 AM
4th order BP is a loud sealed box

assassyn
02-03-2010, 08:29 AM
Bandpass box tuned low, would be nice

grimreper912003
02-03-2010, 10:27 AM
Large chambers will be youre friends but could harm power handeling.

SPLluminator
02-03-2010, 11:42 AM
4th order BP is a loud sealed box

x2, go with the bandpass.

soloXgt
02-03-2010, 11:47 AM
would bandpass be louder than a typical ported box?

SPLluminator
02-03-2010, 11:53 AM
would bandpass be louder than a typical ported box?

It can be, its all dependent on box/etc. Also depends on your bandwidth, etc. Theres SPL bandpass boxes and boxes with a wider freq. response. Im not exactly an expert. Maybe someone else will chime in and help.

I Like Waffle
02-03-2010, 12:54 PM
Large chambers definatly help with sealed loudness, but you have to watch as it lowers the mech. power handling and youll bottom them out easier.

audio_phill
02-03-2010, 12:56 PM
4th order BP's need a sub with an EBP as low as possible and the lower the better to perform with a wide response, If youre looking for a louder box and dont care much for it's +/-3dB response, the 4th order BP is much louder than a sealed box because of the gain it can produce. The flat response BP for the L7 would be a sealed rear chamber of 1.7cu ft net, and the front (ported) chamber would be .82 cu ft net. Tuning needs to be 48Hz and the bandwidth would be 30Hz - 80Hz +/-3dB anechoic. 1.75-1.8 is optimum sealed, Qtc of .7 has a F3 of 48Hz and a 10dB down of 28Hz. Its optimum enclosure would be 3.5 cubic feet ported @ 27.4Hz. Power handling would suffer but it would have a usable bandwidth of 24.5Hz - 80Hz almost perfectly flat. Heres the plots for ya.

http://i386.photobucket.com/albums/oo310/AudioPhill/Car%20Audio/KickerL7BoxComparisonGraphs.jpg