Using a compression driver without a horn is pointless........any links to these "people" using cds without a horn?
I also don't see the point in using a cd with a less than optimum horn, and the optimum horn for that driver will be fairly large (depends on your definition of large). Your comment about a horn having little effect in the mid-high region is simply not true in any sense at all. It seems you don't have any practical experience with horns and that's ok. You might as well scratch the cd from your list.
You can use a CD hornless, it's feasible. I was able to EQ our modified Radian 950 with surprisingly decent results, down to 450hz, no audible distortion or anything that made me say ''that's an absolute no-go''...
Here is a comment from this very website:
That being said: we finally WON'T use any CD.
Much more because of it's lack of popularity among people who follows that test and also logistic problems involved for our blind identification test with a horn (we were to use a horn, not hornless, bytheway).
* also, the remaining drivers in the pre-selection process are so good (competitive) that we have to let some go. We didnt feel any of the CD would've cause a big surprise...
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I run a 2426 bare naked on top of 2226 in BR @ 1.2k & prefer it by far over any horn or cd I have tried yet. Very realistic without any hint of Horn........... I am @ 9' for listening position & only one seat. Imaging is pin point. All ran with 45 SET useing stock SR4725 passive XO, albiet going full active as experiment.
http://www.diyaudio.com/forums/mult...mpression-driver-need-horn-3.html#post2025850
also seen it on some french discussion board as well. People seem to enjoy it.
But, hey, who am i to say it's possible to do that, uh ?
''no, no, no! you CANNOT do that, it's illegal! it's not allowed! you'll break the rules of the earth!''
''no, no, no! you CANNOT do that, it's illegal! it's not allowed! you'll break the rules of the earth!''
intriguing
must say I have considered using a CD without a horn, but I've never seen it or measures to show what the output would be like - there's a nice Visaton one that looks like the diaphragm is flush to the mounting flange, which id love to try with a very short wave guide similar to what many load domes with.
Food for thought, thanks.
(id also like to try Audax HM100Z0 for the mid, but alas I don't trust the few sites that seem to stock them, teamaudio etc)
must say I have considered using a CD without a horn, but I've never seen it or measures to show what the output would be like - there's a nice Visaton one that looks like the diaphragm is flush to the mounting flange, which id love to try with a very short wave guide similar to what many load domes with.
Food for thought, thanks.
(id also like to try Audax HM100Z0 for the mid, but alas I don't trust the few sites that seem to stock them, teamaudio etc)
A 6in long slotted K tube can do wonders with a CD and not have to be a horn. It at least provides impedance matching of the CD's high pressure waves to the ambient surroundings and a wide smooth polar response better than most real horns. Try it sometime - use cardboard even. Anything is better than a step boundary condition of going from throat to 2pi space instantaneously. Without a horn or other waveguide you have a horrible impedance mismatch which not only ruins efficiency it has a large reflection boundary that causes response dips.
http://www.diyaudio.com/forums/mult...e-hf-waveguides-how-many-have-tried-them.html
To try a bare CD and then to rule it out because it doesn't sound good is like using a cone driver without a baffle and saying it has no bass. Sure it has bass if you put your ear 10mm away from it.
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According to my experimentations, without an EQ it's unthinkable.
Also i'd like to note (again) that i did this with a modified PB950 with spacer (provided by Radian) that allows EQ correction in the lower frequencies. Works very well compared to stock one.
The downside is the price.
The upside is you could put up a pretty decent, almost compact, and powerful 2-way using a woofer (or subwoofer such TIW250XS) along with that modified PB950 and a miniDSP (plateamps ?) and get a solid 10 octave with no crossover at all in the mid/mid-hi.
Yes, i do know that.
But then again, putting the CD in the test with anything less than a perfectly matched horn for the test's parameters was not a good idea either:
Using an EQed hornless/shorthorn CD on a baffle WOULD'VE work, but it's so unusual that is pointless for us...
So, anyway, the CD option is out.
Still, we'll do ''unofficial'' testing with some short 600hz horn just for the pleasure. 🙂
If you only need it to go to 600Hz you really should try to listen to a Heil AMT. the big 12lb one. It has amazing transient dynamics and clarity. No sibillance. Very nice and my vote as the best tweeter and almost a mid range ever.
Falcon Acoustics lists them as 'in stock':
Audax HM100Z0 Aerogel 10cm 4" woofer
Never had any problems with them.
HM 100ZO
Hey Mondo,
I'm sorry to have to admit, but I do not recognize the flag of your country. Where are you at ? I have a pair of HM 100ZO scheduled to be used in my next project. Might be several weeks though, because I move slow. They are supposed to sound superb, and yes I do realize with them being such a small driver, 600 or 700 Hz might be the lowest they can manage. I bought my pair at Madisound. Perhaps they can ship to you ?
I'll try to remember to report back my very honest findings on this little gem.
Hey Mondo,
I'm sorry to have to admit, but I do not recognize the flag of your country. Where are you at ? I have a pair of HM 100ZO scheduled to be used in my next project. Might be several weeks though, because I move slow. They are supposed to sound superb, and yes I do realize with them being such a small driver, 600 or 700 Hz might be the lowest they can manage. I bought my pair at Madisound. Perhaps they can ship to you ?
I'll try to remember to report back my very honest findings on this little gem.
heard it already. Very nice sounding driver, indeed. Airy and smooth.
I tend to prefer my tweeters a bit more incisive, though.
But my reference for high detail AND smoothness is the 70-20XR.
Can't wait to try the big Beyma's, though.
That would be my very first choice for that project:
TIW 250 XS - 8 Ohm
But you could use something else as well of course.
TIW 250 XS - 8 Ohm
But you could use something else as well of course.
Thanks! I didn't think of Falcon
@Scott:
I work slowly as well, 2 years plus and I'm still refining my towers. However, flawed as they were I'm still in love with the HDA sound of my first build and I could never afford the HM range when i built those and settled for the AP range.
(I'm in the UK, England.around here st George's flag has a bad rep, but hey. If I was welsh id show their flag instead 🙂)
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England.
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I always loved flags 🙂
dave