I got the transducers (after quite a long waiting) and I can continue my project. The 18Sound coaxials look nice and I suppose (hope) the sound quality is OK. Does anyone have experience on these?
View attachment 397994
View attachment 397994
I only have experience with a pair of 18 sound midbass drivers. They measure better than advertised. As far as the coaxial, usspeaker says it's a "outstanding sounding coaxial." I don't think you'll be dissapointed.
Looking forward to how this project turns out. I have a pair of ciare coax's looking for a permanent home.
Looking forward to how this project turns out. I have a pair of ciare coax's looking for a permanent home.
Cute looking driver!Some trouble with iPad when posting attachments...
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With the additional mid band gain your waveguide will provide (around 4 dB from 200-1000 Hz) the crossover will be "interesting".
Much easier to cross with DSP, as the upper midrange of the woofer has some pronounced frequency response peaks, and flattening out the mid range passively would require a lot of attenuation.
Art
Attachments
Cute looking driver!
With the additional mid band gain your waveguide will provide (around 4 dB from 200-1000 Hz) the crossover will be "interesting".
Much easier to cross with DSP, as the upper midrange of the woofer has some pronounced frequency response peaks, and flattening out the mid range passively would require a lot of attenuation.
Art
Apparently it is much easier than expected at least according to augerpro:
DSP would make it easier though, or going hybrid with passive crossovers but using DSP to fix the global response.
Went through the 4 pages you linked regarding a different coax (B&C, the OP has an 18 Sound) and saw nothing as far as real world crossover suggestions, which even if there were, would not apply to a different pair of drivers in a wave guide compared to a front loaded box.Apparently it is much easier than expected at least according to augerpro:
DSP would make it easier though, or going hybrid with passive crossovers but using DSP to fix the global response.
Erkki has done the relatively easy part (building the box) getting the crossover right passively is not at all easy with the response curves of the drivers used.
Went through the 4 pages you linked regarding a different coax (B&C, the OP has an 18 Sound) and saw nothing as far as real world crossover suggestions, which even if there were, would not apply to a different pair of drivers in a wave guide compared to a front loaded box.
Erkki has done the relatively easy part (building the box) getting the crossover right passively is not at all easy with the response curves of the drivers used.
You are right, I mixed up the names since they are quite similar.
Erkki has done the relatively easy part (building the box) getting the crossover right passively is not at all easy with the response curves of the drivers used.
Yes, and there still is the matter of optimizing the box tuning (volume, ports) before I even dare to touch the xover issue Perhaps I just do it with DSP.
DSP would be a much easier proposition, even if you have several kilos of a wide variety of crossover parts at your disposal, and several weeks of time to experiment with them .Yes, and there still is the matter of optimizing the box tuning (volume, ports) before I even dare to touch the xover issue Perhaps I just do it with DSP.
That's a really wierd looking driver... does the tweeter fire through the rear of the woofer???
Certainly an interesting solution, can't say I'm a big fan of the concept but it could be counter-intuitive (i.e. work a lot better than expected!)
Not sure what you mean; that's a pretty typical, time-honored arrangement. Look at an Altec 604, or the Tannoy dual concentrics, for example. The 604 has a separate horn, but the Tannoys use the woofer cone as the high frequency horn.
first passive xo took me more than 5 years
next one a year or two
now I'm lucky if I make it within a year
with DSP I can imagine it would take some time too, if its fun
and it is certainly very high on my 'want to try' list
but I admit, speakers are like therapy to me, so the longer it takes ...
btw, GroundSound have a new 2way DSP kit ... http://groundsound.com/dcn24rpc.php
next one a year or two
now I'm lucky if I make it within a year
with DSP I can imagine it would take some time too, if its fun
and it is certainly very high on my 'want to try' list
but I admit, speakers are like therapy to me, so the longer it takes ...
btw, GroundSound have a new 2way DSP kit ... http://groundsound.com/dcn24rpc.php
...
but I admit, speakers are like therapy to me, so the longer it takes ...
btw, GroundSound have a new 2way DSP kit ... Ground Sound
Man's happiness is directly proportional to the number of his hobbies. I have to check that DSP.
Edit: that DSP actually looks feasible and reasonably priced. I guess std version of the software would be OK because I already have measurement gear?
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That's a really wierd looking driver
Rather common actually. The small tweeter horn, or fart tube as I like to call them is behind the dustcap. If it is really short the cone does most of the horn function, as Francis mentioned.
If you have access to DSP but still want passive xovers then one thing that should work ( when I get my xover-parts I can confirm if it does ) is to first use light global DSP to fix response and apply the crossover slopes you want to get the response you want.
Then measure the woofer and compression driver separately with and without the crossover slope. Measure impedance, then hook up some simulation software and play around with components until you get the raw driver response into the crossed driver response. Then you shouldn't have to worry about acoustical offset and such in the simulation software.
I've used this method to design an assymetric crossover in my dipole with the rear tweeter waveguided and crossed lower, I'll just have to hope it measures like expected in the end
Then measure the woofer and compression driver separately with and without the crossover slope. Measure impedance, then hook up some simulation software and play around with components until you get the raw driver response into the crossed driver response. Then you shouldn't have to worry about acoustical offset and such in the simulation software.
I've used this method to design an assymetric crossover in my dipole with the rear tweeter waveguided and crossed lower, I'll just have to hope it measures like expected in the end
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