Hi,
I've been perusing the content of :
http://www.quarter-wave.com/Horns/BLH_Design_Article.pdf
And it seems to me this is a way of doing several things with a small driver :
1) Avoiding BSC, that gives a big jump in efficiency.
2) Excursion control at low frequencies, basically a lot more bass given Vd.
3) Actually requiring placement in corners, not good with some designs.
Designed of course for FR drivers, but that doesn't stop you using
it with a decent efficiency, decent throw but not too low Fs driver.
An inverted driver arrangement is probably easiest.
Strikes me this should work well :
Zaph|Audio - ZA14W08 Woofer
Possibly the ZA5.2iw croosover from
Zaph|Audio - ZA5 Speaker Designs with ZA14W08 woofer and Vifa DQ25SC16-04 tweeter
Very big of course for the driver size, but some people like that.
And not perfect either, but a different ball game to a 10L box.
rgds, sreten.
I've been perusing the content of :
http://www.quarter-wave.com/Horns/BLH_Design_Article.pdf
And it seems to me this is a way of doing several things with a small driver :
1) Avoiding BSC, that gives a big jump in efficiency.
2) Excursion control at low frequencies, basically a lot more bass given Vd.
3) Actually requiring placement in corners, not good with some designs.
Designed of course for FR drivers, but that doesn't stop you using
it with a decent efficiency, decent throw but not too low Fs driver.
An inverted driver arrangement is probably easiest.
Strikes me this should work well :
Zaph|Audio - ZA14W08 Woofer
Possibly the ZA5.2iw croosover from
Zaph|Audio - ZA5 Speaker Designs with ZA14W08 woofer and Vifa DQ25SC16-04 tweeter
Very big of course for the driver size, but some people like that.
And not perfect either, but a different ball game to a 10L box.
rgds, sreten.
Retracing the K-Horn at a small scale? Ironic, I was just commenting over there to the gentleman who wants a 15 inch midrange, Paul's main thesis was that distortion and efficiency are inversely proportional.
I am doing my third set of speakers with the Zaph drivers. Traditional ported this time. I was totally unhappy with them the first two times around. They hit an odd gap in the market which I am sure is why John had them built. He is not kidding when he warns you to notch or keep away from the breakup range. Below that, they are very clean for the money. I have two ideas this time around. Very low very steep crossover to an SB tweeter that goes about as low as any small tweet can, or a three way using a 3 inch mid and spreading the crossovers even further but low order. Maybe even first. (Is this Vanderstein's secret?) Building both ideas to compare. Wonder how that would work as a corner horn? Folded corner horn on the Zaph, big waveguides on the mid and tweet.
Another driver you may think about is the Planet 10 modified Fostex. I found they still need a tweeter, but they are as close to ultra wide range as I have seen. Mark Audio maybe? Zaph is a lot cheaper.
Post your progress. Sounds like a fun project.
I am doing my third set of speakers with the Zaph drivers. Traditional ported this time. I was totally unhappy with them the first two times around. They hit an odd gap in the market which I am sure is why John had them built. He is not kidding when he warns you to notch or keep away from the breakup range. Below that, they are very clean for the money. I have two ideas this time around. Very low very steep crossover to an SB tweeter that goes about as low as any small tweet can, or a three way using a 3 inch mid and spreading the crossovers even further but low order. Maybe even first. (Is this Vanderstein's secret?) Building both ideas to compare. Wonder how that would work as a corner horn? Folded corner horn on the Zaph, big waveguides on the mid and tweet.
Another driver you may think about is the Planet 10 modified Fostex. I found they still need a tweeter, but they are as close to ultra wide range as I have seen. Mark Audio maybe? Zaph is a lot cheaper.
Post your progress. Sounds like a fun project.
The ZA14 is a good driver. The mids are exceptionally "clean", perhaps due to low harmonic distortion.
In a BR, with EQ (passive or active), you can get some nice bass out of it. Doesn't go down to 40Hz, about 50~60Hz (-3dB) but bass is tight and defined.
I have no issues with the cone breakup. 2nd or 3rd order at 2K2~2.5K is enough to bury it.
Regards
Mike
Hi,
By implication a low Fs would imply 5" drivers with parameters
too far off the family of drivers the BLH is designed for and I
wouldn't like to guess how well it would work or not.
Generally low Fs is low efficiency for a 5", and high Vas and Mms.
The Fostex is 89dB, 67Hz, Q-0.42, Vas-7.3L.
The ZA14W08 is 87dB, 66Hz, Q-0.44, Vas-5.2L.
Quite similar, the differences in Vas echo a 5g cone mass vs 7g.
I cannot check it with the worksheets, someone could.
rgds, sreten.
"All of the crossovers use a tiny cap across the first woofer
inductor as a trap circuit to kill the breakup a bit more "
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