How about a Betsy k from wild burro audio? Wild Burro Audio Labs - Fullrange Speakers - The Betsy & Betsy-K Drivers
I found this thread while searching for a BLH or BVR box for my Sonido SFR-200A speakers. The T/S parameters can be seen here: http://sonido.hu/adat_pdf/sfr-200a.pdf
I came up with 30 l chamber, Ath = 114 cm2, Am = 1340 cm2. In Hornresp, I get 105 db at 40 Hz at maximum displacement (in 1 pi placement) which is still kind of cool and well above the intended listening level.
Does this sound reasonable?
Edit: If have a look above, the volume should be around Vas/0.8, which gives ca 75 liters for the Sonido with smoother response and lower extension. Still over 100 dB capable down to almost 30 Hz. Exponential expansion gives lower gain but better response. Now I just need to fold it into a box, which should not be difficult.
I came up with 30 l chamber, Ath = 114 cm2, Am = 1340 cm2. In Hornresp, I get 105 db at 40 Hz at maximum displacement (in 1 pi placement) which is still kind of cool and well above the intended listening level.
Does this sound reasonable?
Edit: If have a look above, the volume should be around Vas/0.8, which gives ca 75 liters for the Sonido with smoother response and lower extension. Still over 100 dB capable down to almost 30 Hz. Exponential expansion gives lower gain but better response. Now I just need to fold it into a box, which should not be difficult.
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Hmm, your sims are different than posted.....regardless, at 1 W/Xmax = ~98 dB/40 Hz/1pi and somewhat lower at < 1 W with the 70 L version, but HR defaults at 1 W, so not sure by how much; i.e. always test your sim in the TOOLS/MAXIMUM SPL calculator to find the approximate linear power handling limit, though with these type drivers they can normally be safely pushed somewhat past this point, but doubt it would be enough to hit 105 dB/40 Hz except in a seriously large BLH, which would probably over damp the driver enough to ruin it for 'full-range' apps.
GM
GM
GM, I am sorry for mixing the files - I think this one should be as close to the original posting as possible, the 75 l version is bad and you are very correct about the 1W limit. The 30l version however does what I claimed (if I am interpreting the results correctly).
The point is, I am trying to find some suitable box for these speakers - I can use the Sonido BLH, but I would like to explore some options.
The point is, I am trying to find some suitable box for these speakers - I can use the Sonido BLH, but I would like to explore some options.
I don't see how you can read it that way.....I get @ Xmax:
1W = ~60 Hz/105 dB
As power goes up, the frequency does drop, but at the expense of the higher BW increasingly exceeding Xmax, so it's academic
except if there's a narrow BW spike down low [not likely].
That said, it's not that bad an alignment, but if size isn't a major issue, how about ~110 dB eff. with 'flea' [fractional] power......
GM
1W = ~60 Hz/105 dB
As power goes up, the frequency does drop, but at the expense of the higher BW increasingly exceeding Xmax, so it's academic
except if there's a narrow BW spike down low [not likely].That said, it's not that bad an alignment, but if size isn't a major issue, how about ~110 dB eff. with 'flea' [fractional] power......
GM
The picture in the attachment is what I get with the 35l BVR simulation - and maximum SPL tool. The red part (if I understand it correctly) is the Xmax limited part.
The BLH you suggest is very efficient, but I am afraid it is already too large. Something similar to Hedlund horn or the Sonido's own designs is the largest I can tolerate in my room.
I just wondered how the SFR200A would perform in the somewhat smaller Replikon-like BVR.
The BLH you suggest is very efficient, but I am afraid it is already too large. Something similar to Hedlund horn or the Sonido's own designs is the largest I can tolerate in my room.
I just wondered how the SFR200A would perform in the somewhat smaller Replikon-like BVR.
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