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Dynaudio 12" transmission line subwoofer
Dynaudio 12" transmission line subwoofer
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Old 30th September 2012, 11:01 PM   #11
bjorno is offline bjorno  Sweden
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Originally Posted by d1030180 View Post
I certainly hope not! I thought it would be quite OK with many bracing panels & sticks & triangles added inside the enclosure?

Here is a picture of one bracing panel glued and screwed, I didn't have enough time to finish installing the others on this weekend.

Hopefully I have some time to install the remaining panels next weekend! And also to add some triangular-shaped vertical braces.
Hi d1030180,

Agree, Looks to be a well built design..

An late answer for Post#7:

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Old 7th October 2012, 02:07 PM   #12
d1030180 is offline d1030180  Finland
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Thanks for your information, bjorno

I glued a couple of support triangles into the enclosure and made a cutout for the driver.
It still needs a few more triangles and attachment of the side panel... So far it's looking good.
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Old 25th November 2012, 01:12 PM   #13
d1030180 is offline d1030180  Finland
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I have recently been testing a sealed prototype of this sub.

The sub integrates nicely with the main speakers after stuffing their ports tightly with cotton wadding. I get the best sound when I set the plate amp's crossover frequency to 40 Hz and volume to around 40 %. With these settings I find its sound very good indeed, at least with music material. Its output is definitely more impressive than the compact 10" subwoofer which I finished building during last summer.

With the port opening closed by a piece of MDF and no enclosure stuffing I measured a resonance peak at 35 Hz. I don't have any way to measure the frequency response, but after testing with some test tracks it seems to extend at least down to 25 Hz. According to the simulation based on the location of the impedance peak, the total Q should be around 0,68..0,70.

The crossover is still a bit high for me and I'm planning to change some components in the filter section to attain a slightly lower adjustment range. Maybe something like 30-100 Hz instead of current 40-160 Hz. I've already modified the filter to get rid of the in-built peaking (+6 dB/40 Hz) second order high-pass filter.

I still need to decide which plate amplifier should I be using with this sub. Currently the enclosure has a slight leak in one of the bottom corners, so I would need to cut a hole anyway to be able to reach all the corners for applying wood glue.
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Old 16th February 2013, 10:23 PM   #14
d1030180 is offline d1030180  Finland
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Finally had some free time for applying some putty and sanding to smooth out the gaps and small imperfections. The finish won't be perfect as the surface of the wood material itself is not totally straight; however this is not such a big problem for me.
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