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Cheap BG Radia BGX alternative?
Cheap BG Radia BGX alternative?
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Old 3rd January 2018, 07:29 PM   #1
4real is offline 4real  Netherlands
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Default Cheap BG Radia BGX alternative?

In the search for ever less intrusive subwoofer solutions I came across the BG Radia BGX series. These high end things can be mounted either in-wall or on-wall and if you have a bunch of them, they apparently can go really loud..

Click the image to open in full size.

It appears as though these are simply a bunch of small woofers in a separate closed boxes, strung together to radiate into a plenum.

Now I found these: Tymphany W1640 | DIY which is about 11 euro's per tiny "subwoofer". one could buy 4 packs of 6 and string them together into two groups of 12, just like the BGX.

The plenum will probably lower the FS a bit, helping with the power handling. Is there any way to simulate this? On-wall mounting would also help raising the low end since you essentially get a huge baffle. One could even use a Peerless 830878 PR to boost power handling, but it would double the cost, and buying more driver for the same amount of money would be more efficient anyway

The idea would be to make some "sound absorbing" panels for behind the speakers that would contain these tiny subs and absorbing material. Should be fairly inconspicuous..
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Old 3rd January 2018, 10:48 PM   #2
multi is offline multi  Australia
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Great to see these things coming on the market; i bought 4 horn loaded speakers with JBL and BNC so cheap wonderful speakers, 105db
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Old 4th January 2018, 12:18 AM   #3
hollowboy is offline hollowboy  Australia
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Originally Posted by 4real View Post
Now I found these: Tymphany W1640 | DIY which is about 11 euro's per tiny "subwoofer". one could buy 4 packs of 6 and string them together into two groups of 12, just like the BGX.
71dB efficiency is remarkably low. Using 12 drivers will get you up to around 80dB ...which is still remarkably low.

If you wanted to stay with this concept, you could simply angle the driver baffles, allowing you to fit larger (more efficient) woofers into the same depth of enclosure.

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The plenum will probably lower the FS a bit, helping with the power handling. Is there any way to simulate this?
Look up PPSL (push pull slot loaded) designs. They have a plenum, and I don't think that they lower Fs.

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On-wall mounting would also help raising the low end since you essentially get a huge baffle.
Yes. Depending on how your room is constructed, putting the plenum in a wall & ceiling boundary, or in a corner, would be even better.

If what you want is a 4" thick wall mounted LF system, and you don't really care how the drivers are arrayed, you might find that you get better value from normally arranged, low profile subs. e.g. look on Parts Express at the Dayton, or Peerless (GBS) low profile drivers.

Also: have you seen the Cornu spiral horn? You could adapt something like this to work with a low profile sub.
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Old 4th January 2018, 10:02 AM   #4
4real is offline 4real  Netherlands
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71dB efficiency is remarkably low. Using 12 drivers will get you up to around 80dB ...which is still remarkably low.
Yes, it is. bit low.

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If you wanted to stay with this concept, you could simply angle the driver baffles, allowing you to fit larger (more efficient) woofers into the same depth of enclosure.
Sure, that would however impact the plenum structure.

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Look up PPSL (push pull slot loaded) designs. They have a plenum, and I don't think that they lower Fs.
Hmm, I might have been mistaken there. I do however see a 3dB increase in efficiency.

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If what you want is a 4" thick wall mounted LF system, and you don't really care how the drivers are arrayed, you might find that you get better value from normally arranged, low profile subs. e.g. look on Parts Express at the Dayton, or Peerless (GBS) low profile drivers.
Not so sure about that. I simmed both, 2x10" (Dayton and Tymphany) vs 24xTymphany, and in 12 Liters total volume, the maxSPL down low is within 1dB (for a closed box). So no, they are not really much better

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Also: have you seen the Cornu spiral horn? You could adapt something like this to work with a low profile sub.
They are pretty cool, but they need quite a lot of volume as far as I can see.

The tiny Tymphany's need about 0.6 Liters per woofer. I could easily 3D print a sturdy but thin rear cup for them.
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Old 4th January 2018, 10:05 AM   #5
globalplayer is offline globalplayer  Germany
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Shallow car hifi subs?
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Old 4th January 2018, 02:23 PM   #6
4real is offline 4real  Netherlands
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Shallow car hifi subs?
Which ones? Pioneer TS-SW2502S4 performance not better and is more expensive (in same volume). MTX FPR10 will go a bit louder, but is much more expensive. The rest is even more expensive. Also all of them have far to high Qts and need much more volume to perform any better.
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Old 4th January 2018, 07:02 PM   #7
globalplayer is offline globalplayer  Germany
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I don`t know.
It was just an idea.
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Old 8th January 2018, 12:50 AM   #8
hollowboy is offline hollowboy  Australia
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Not so sure about that. I simmed both, 2x10" (Dayton and Tymphany) vs 24xTymphany, and in 12 Liters total volume, the maxSPL down low is within 1dB (for a closed box). So no, they are not really much better
I thought you were just after a thin box - didn't realise total volume was such an issue.

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They are pretty cool, but they need quite a lot of volume as far as I can see.
If being unobtrusive is key:

Mount a flat sub on the ceiling, and paint it to blend in.

Or build IB subs, where all you see is the manifold opening.

Or get an off-the-shelf gaming chair (that has a sub built in).

Or skip the sub: install a tactile transducer on your current chair.
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Old 8th January 2018, 09:21 AM   #9
4real is offline 4real  Netherlands
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I thought you were just after a thin box - didn't realise total volume was such an issue.
Well, there really is no point in using 3" drivers if you'd need a 100L box is there


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Mount a flat sub on the ceiling, and paint it to blend in.
Would be cool, but my ceiling is quite old and brittle and I don't want to break it. I guess the sub would make it all come down at the first movie I watch . It is also quite high up, about 3.5m. Also will be hell to put in the wiring without a major decorating job.

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Or build IB subs, where all you see is the manifold opening.
No other rooms to act as the other side, except for a garage. I don't think the neighbours would like it. I also don't like to plow though solid brick to make a nice hole in my wall.

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Or get an off-the-shelf gaming chair (that has a sub built in).
I'd not call that unobtrusive

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Or skip the sub: install a tactile transducer on your current chair.
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Old 8th January 2018, 03:10 PM   #10
pieter t is offline pieter t  Netherlands
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4real je hebt PM.
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