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Old 7th November 2012, 01:08 PM   #1
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Talking Turn the Reflex box in Bandpass:

Hello. time ago I built a box for subwoofer 18ps76. Multilayer of poplar, thickness 1.5. The interior liters is 135 liters, the door is about 70 cm long (50cm x 10cm) and if I'm not mistaken tuned at about 35 hertz.
Now, I would like to add to the existing box an 'other box tuned to 80 to 90 Hz . I thought the easiest solution, a box with a tube (relfex box). But my friend asked me if I could replace it with a little horn cus this one have more gain.
I am not an expert in the area. To calculate the reflex box, I have no problems for the horn instead.

Place some pictures:

Actual box:
Click the image to open in full size.

What i want to build:
Click the image to open in full size.
Click the image to open in full size.

The other option of what i want to build:
Click the image to open in full size.
Click the image to open in full size.


Does anyone know how to do it with the horn?
Thanks in advance


PS: sorry for my english

Last edited by Teresh; 7th November 2012 at 03:20 PM.
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Old 7th November 2012, 04:34 PM   #2
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You can model the design you drew in Hornresp as a horn/BR combo.
As drawn, my guess is the "horn" won't be very effective in the frequencies of interest.

The little "skateboard ramps" won't be needed for low frequencies, neither will the foam, which robs a bit of level.

Have fun!

Art
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Old 7th November 2012, 05:13 PM   #3
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Quote:
Originally Posted by weltersys View Post
You can model the design you drew in Hornresp as a horn/BR combo.
As drawn, my guess is the "horn" won't be very effective in the frequencies of interest.

The little "skateboard ramps" won't be needed for low frequencies, neither will the foam, which robs a bit of level.

Have fun!

Art
Now the wood behind the reflex, moves too much when I give more than 300 watts to subwoofer. I would like to improve it a little bit.

What do you advise me to do?
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Old 7th November 2012, 05:29 PM   #4
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Remove the back panel, so there won't be anything that it'll vibrate

Or

put some braces across front and back panel
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Old 7th November 2012, 05:42 PM   #5
sreten is offline sreten  United Kingdom
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Hi, IMHO it will cause more problems than it will solve, and it won't work well, rgds, sreten.
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Old 7th November 2012, 05:50 PM   #6
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Hi , it is better to 'unmask' the source of the sound than putting more walls covering it.
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Old 7th November 2012, 08:07 PM   #7
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Quote:
Now the wood behind the reflex, moves too much when I give more than 300 watts to subwoofer. I would like to improve it a little bit.
Line the walls of the box with 3/4" X 2 or 2-1/2" pieces of good ply just like the stick walls in a normal house.
Make them 8 to 10" on center.
This will make the box very stiff.
Make sure yo do all sides, including the top and bottom.
Glue them well and use a couple of screws, from the outside if you can, in each piece of 3/4" ply.

Dave
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Last edited by Shadydave; 7th November 2012 at 08:09 PM.
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