Bassreflex with JBL 2226h??

[morten_msp]

First sorry, My english Are really bad. :crying:
I have a 120 liters cabinet to my 15" JBL 2226h bass speaker, and going to make the cabinet a bassreflex cabinet, because the deep bass was really bad.
What port size may i use? 1 or 2 ports? Please help :confused:
spec for the speaker:

Hz: 30-2500
fs: 40 Hz
Re: 5.0 ohms (H)
Qts: 0.31
ms: 5.0
Qes: 0.33
Vas: 175 l
Sd: 0.088 m2
Vd: 689 cm3
Le: 1.75 mH (H)

Half space 2: 3.3%
Pe (Max)1
Overall Diameter: 388 mm (15¹⁷⁄₆₄ in)
Bolt Circle Diameter: 370 mm (14⁹⁄₁₆ in)
: 137 mm (5½ in)
Volume Displaced by Driver: 6 l

[more10]

Hei Morten

Pictures of the cabinet? Inner dimensions of the box? Speaker placement?

Rebuilding a pair of srx (http://www.audioheritage.org/vbulletin/showthread.php?33259-Rebuilding-a-pair-of-srx). I started with a -6 dB bass shelf in win-isd. Then modelled in hornresp. It works because the box is tall.

Mårten

[Jan Daugaard]

Here you have 2 tuning suggestions, both with a 10 cm port, tuned to 52 Hz and 40 Hz, respectively. In the first case with a 2 cm deep port (which, in effect, is a hole in the front baffle), in the second case with a 5 cm deep port.

[ivica]

Here you have 2 tuning suggestions, both with a 10 cm port, tuned to 52 Hz and 40 Hz, respectively. In the first case with a 2 cm deep port (in effect no port -- the front baffle is about 2 cm thick), in the second case with a 5 cm deep port.

In the case of 2226H driver usage , cone displacement can be limitation parameter if not hi-pass filter applied ( say under 30Hz). I think that 2226H is not the best solution for LF driver (without horn-loading)

Regards
Ivica

[Lee in Montreal]

You won't go deep with a 2226 as it is a midbass driver, not a subwoofer. Tune the cabinet to 40Hz and give a 6db boost from 80 Hz downward. High pass at 30Hz is a good idea as there's no reason to waste power on that bottom octave that will never happen.

[morten_msp]

Thank you every body for the help, im new with this bass speaker so tanks for all the helpfull information. I think i'm going to use a 4" port on 5 cm :)
Again sorry about my bad english :)

[Lee in Montreal]

A single port of 4" diameter x 2" length will tune a 120l enclosure to 40 Hz - http://www.psp-inc.com/tools.html

[frank23]

Check this, enclosure 6 for the 2226: http://www.jblpro.com/pub/manuals/enclgde.pdf