The Celestion 15” coax looks good on paper. Have seen no review. 1kHz. For studio use I think coax are quite nice but haven’t tried 15”, only 10 and 12 with good results.
Celestion FTX1530 - Coaxial/Twin Cone Speaker Driver
Celestion FTX1530 - Coaxial/Twin Cone Speaker Driver
I seem to be sharing these links over and over but maybe you'll find them useful?
The Faital PR400 has been mentioned a few times already. I use them sealed but in a large cab ported like the campos they dig down into the mid 30s, you may get some room gain too?
http://www.humblehomemadehifi.com/download/Humble Homemade Hifi_Calpamos.pdf
They're also very extended, flat up to 4khz.
OBL-15
The Faital PR400 has been mentioned a few times already. I use them sealed but in a large cab ported like the campos they dig down into the mid 30s, you may get some room gain too?
http://www.humblehomemadehifi.com/download/Humble Homemade Hifi_Calpamos.pdf
They're also very extended, flat up to 4khz.
OBL-15
2.5khz is pretty high ... you know that. While these suggestions for a 15" can reach that the question would be how natural they're going to sound up there. If you're thinking along the line of a subs use maybe consider a 10" like the jbl 2123h. 2123H | JBL Professional Loudspeakers
These are for sale often and are excellent midrange drivers.
A fella did some evaluations of various CD's just to see which could reach 800hz and found that the de250 did along with another driver from diysound group. He settled for 900hz for home use. So the de250 can work there.
These are for sale often and are excellent midrange drivers.
A fella did some evaluations of various CD's just to see which could reach 800hz and found that the de250 did along with another driver from diysound group. He settled for 900hz for home use. So the de250 can work there.
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If you have to cross a 15" woofer that high (I would not) then the only driver suitable I know is the Altec 515. You can buy vintage and take your chances, or get a new one from GPA - Great Plains Audio. Perhaps one of the TAD woofers could work, but I don't know them well.
I yet have to see a more linear 15 inch driver than BD15 custom made by Beyma. It's basically a 15mi100 with curvilinear cone ND Neodymium magnet and under hung short coil.
Loudspeakersplus has an interesting P-Audio neo 15CX cheap. The woofer has a 3.25" coil and CD, 2.5" There's a woofer dip IIRC between 1 & 2K - perhaps from its horn. It would be Karlson fodder for myself 🙂
P Audio SN15-500CX Co-Ax Speaker
https://www.loudspeakersplus.com/v/vspfiles/templates/driven/pdfs/SN15-500CX6.pdf
A Speakerplans discussion said to :forget it: on te 500CX - -too flawed - not enough excursion for PA work, dip from horn. 4.8mm is really more than whats needed with a Karlson 15.
P-Audio SN15-500CX - Speakerplans.com Forums
I've seen reviews saying the inexpensive 1.4" LASE CD are good.
P Audio SN15-500CX Co-Ax Speaker
https://www.loudspeakersplus.com/v/vspfiles/templates/driven/pdfs/SN15-500CX6.pdf
A Speakerplans discussion said to :forget it: on te 500CX - -too flawed - not enough excursion for PA work, dip from horn. 4.8mm is really more than whats needed with a Karlson 15.
P-Audio SN15-500CX - Speakerplans.com Forums
I've seen reviews saying the inexpensive 1.4" LASE CD are good.
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Dave the response of the BD-15 is extraordinary. Not only is the top end is near perfect, but the low end roll-off on OB is unusual for a woofer with that Qts and Vas. Too good to be true?
( Some ) Altec HF response ( as measured independently, in Japan by a reconer//reburbisher who evidentially cares enough about his craft to actually measure + post the results of his repairs ).
Compare to a couple well known JBL HiFi woofs ( 2235H > should be crossed over well before 1K );
These days ( from what I've seen ) FaitalPro seems to follow Altec's goals and design philosophy ( regarding the importance of HF extension in a woofer ).
🙂
Compare to a couple well known JBL HiFi woofs ( 2235H > should be crossed over well before 1K );
These days ( from what I've seen ) FaitalPro seems to follow Altec's goals and design philosophy ( regarding the importance of HF extension in a woofer ).
🙂
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OP, why are you switching the woofer if the problem is the compression driver/horn? Bending the system design to patch an issue might fix it while introducing other problems. If you want to crossover above 2kHz a 6" or 5" driver would be better sound, but that would also be another system.
I'd sell the de250 and try some other compression driver, but it might be the horn? sell the speakers and buy better ones would be the best solution.
I'd sell the de250 and try some other compression driver, but it might be the horn? sell the speakers and buy better ones would be the best solution.
The AE 15” with Apollo upgrade certainy should be in the conversation.
Getting a 15: to do 2.5 KHz happily is a real stretch.
dave
Getting a 15: to do 2.5 KHz happily is a real stretch.
dave
1 inch CD Comparison (SEOS18) | AVS Forum
That's the CD comparisons I had referred to. Long story short, a lot of 1"cd's just won't make it to 8-900hz ... aside from the "home use" vs Pro SPL issue. The SEOS-18 might not be optimal vs the SEOS-15 though in that test ... but the drivers still need to get there.
That's the CD comparisons I had referred to. Long story short, a lot of 1"cd's just won't make it to 8-900hz ... aside from the "home use" vs Pro SPL issue. The SEOS-18 might not be optimal vs the SEOS-15 though in that test ... but the drivers still need to get there.
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I mentioned it early on(sans Apollo) and was surprised it took this long to be mentioned again.
Smooth, clean response up to and past 2k, and ultra low distortion.
The only issue will be defying physics and not suffer from awful beaming past 1k. If that's not a concern, send it!
Those are all very good bits of info. I appreciate the input.
I'm coming to the conclusion that this may have to end up being a 3 way speaker unless I can find a compression driver that will go down low without sounding wonky to my ears. The thing pushing me towards a 2 way solution is the midbass. There is nothing more engaging than the midbass that comes from a large cone driver. It conveys the real physical aspects of wide spectrum instruments like drums, piano and even vocals the way they are heard (and felt) in real life. Because of how little the cone needs to move to reproduce that low end, it usually ends up being much less distorted than smaller drivers trying to do the same thing. So from that aspect alone I'd prefer to keep it a large 2 way. Compromises, compromises...
Once the large speaker bug has bitten you, its hard to resist it and nothing else usually satisfies like it.
I've always tried to follow the unwritten rule to stay out of the impedance peak range of a compression driver. A few years back I built a 2 way 15+1 inch driver setup with a selenium d220ti on a large rectangular expo horn. I crossed it at 1.5k 3rd order, but I used a parallel notch to flatten the primary resonance. That speaker didn't have quite as much of that midrange rasp I was referring to, but it still got a bit harsh when played loud. Im starting to think the problem I'm hearing comes from IMD around the lower resonance peak and the interaction with the waveguide. I'm by no means an expert on compression drivers, but I do know that you should always stay out of the driver's primary resonance peak which always reduces odd order harmonics.
So maybe I am a closet M2 worshiper and don't want to admit it. I just wished there was a horn driver that I could afford which sounded clean enough to my ears. For now the best compromise is running the woofer up higher until i come across that special driver.
The smaller Seos waveguides dont really allow crossing over that low if you want some extension of the response past the xover point to accommodate a more shallow passive HP filter. That would be more suitable for use with active DSP filtering which I'm not fond of
- the only digital I embrace is my massive CD collection, otherwise its mostly vinyl and analog tape... yes, I know I'm a dinosaur.