ey wuts up man ?, i had a question and i'll be really happy if u could help me out. i have two audiobahnn aw1200Q in a home made box. the boxes depth and width is 32"in, and it's height is 15". it's two chanber, with a 3"w x 6"L tube as the port. is this about the size the box should be or is it a good size? oh and one more thing should i use a bigger and longer tube as the port?
well thanks man
Replies (4)
guitarexpert89 on 04/2/2009 23:45:43
swez on 04/3/2009 03:18:22
Welcome to CK!
That's a huge box and if using 3/4" wood and a divider panel between the subs, the net internal airspace will be about 3.5 cf/chamber. However, you are close on the internal air space/sub, but way off on the ports. Port noise and sub cone instabilty will result at high power levels with the ports used not.
This box is not properly ported for these subs and damage to the subs at high SPL levels is likely in time. Each chamber should have 2 ports, 4" Dia x 11.0" long. That would match the Ultimate SPL BASS specs recommended by Bahn.
Here are the box specs for the Bahn AWxxxxQ series:
http://akamaipix.crutchfield.com/Manuals/037/037AW1000Q.PDF
Does your amp have a subsonic filter feature available?
Swez
guitarexpert89 on 04/3/2009 16:34:20
yea man my amp does have a subsonic feature on it, but it's all turned down. both are sub are briged and the amp is already cross over. so i need bigger ports, ok. and also i heard their free air woofer.. does that mean the magnet is supposed to be inside the box or out?
swez on 04/3/2009 17:27:12
Yes, larger ports are needed as per specs noted earlier.
Free air means the speaker can be used w/o a box. In this case, you have a box and the ports are not correct. The small and short ports used now, run the risk of damaging the subs with over excursion problems at high SPL levels.
The larger the box, the less air pressure there is inside the box to hold the sub mechanicals in proper control and lower their power handling ability by almost 50%.
For now, set your subsonic filter to 40 Hz. Once the ports are changed, you can reset the filter to 30-35 Hz.
Swez
well thanks man
Replies (4)
guitarexpert89 on 04/2/2009 23:45:43
swez on 04/3/2009 03:18:22
Welcome to CK!
That's a huge box and if using 3/4" wood and a divider panel between the subs, the net internal airspace will be about 3.5 cf/chamber. However, you are close on the internal air space/sub, but way off on the ports. Port noise and sub cone instabilty will result at high power levels with the ports used not.
This box is not properly ported for these subs and damage to the subs at high SPL levels is likely in time. Each chamber should have 2 ports, 4" Dia x 11.0" long. That would match the Ultimate SPL BASS specs recommended by Bahn.
Here are the box specs for the Bahn AWxxxxQ series:
http://akamaipix.crutchfield.com/Manuals/037/037AW1000Q.PDF
Does your amp have a subsonic filter feature available?
Swez
guitarexpert89 on 04/3/2009 16:34:20
yea man my amp does have a subsonic feature on it, but it's all turned down. both are sub are briged and the amp is already cross over. so i need bigger ports, ok. and also i heard their free air woofer.. does that mean the magnet is supposed to be inside the box or out?
swez on 04/3/2009 17:27:12
Yes, larger ports are needed as per specs noted earlier.
Free air means the speaker can be used w/o a box. In this case, you have a box and the ports are not correct. The small and short ports used now, run the risk of damaging the subs with over excursion problems at high SPL levels.
The larger the box, the less air pressure there is inside the box to hold the sub mechanicals in proper control and lower their power handling ability by almost 50%.
For now, set your subsonic filter to 40 Hz. Once the ports are changed, you can reset the filter to 30-35 Hz.
Swez
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