A 6" driver will start to have a narrowed pattern around 2kHz. Unless you want some big off-axis holes in the coax response it would be prudent to cross over much lower than 8kHz... Co-incidence does not fix what the woofer is doing, it only eliminates lobing or other off-axis issues around the crossover point where both drivers operating together.
Some people like to hear music in the nearfield instead of using earphones!
And Coaxes are better suited for nearfield listening ...
Many people are so used to get rooms reflections it's like some kind of drug for them ... but earphones demonstrate what room speakers lacking of!
Ladies and Gentlemen , AUDIO WONDERS OF THE WORLD proudly presents , here and now :
The ultimate killer track (1975!) for compairing speakers to earphones , but beware of shock , take one of your heart stabiliser emergency pills before listening :
Caution : Later "remaster" releases have the compression desease!
And Coaxes are better suited for nearfield listening ...
Many people are so used to get rooms reflections it's like some kind of drug for them ... but earphones demonstrate what room speakers lacking of!
Ladies and Gentlemen , AUDIO WONDERS OF THE WORLD proudly presents , here and now :
The ultimate killer track (1975!) for compairing speakers to earphones , but beware of shock , take one of your heart stabiliser emergency pills before listening :
Caution : Later "remaster" releases have the compression desease!
Correction : Earphones = Headphones! (STAX is calling their headphones earphones which I use mostly)
So far the Sica 5.5 is one of the only reasonably priced coax which deliver very good performance and have decent individual drive elements compared to most other coax. The only other model I really like is the Seas T18REX. It has very clean response around the tweeter cutoff and can be slightly improved by trimming the tweeter flage collar for a smoother transition to the cone. The biggest criteria for a dedicated mid coax is power handling, which means at least a 38mm VC. These little 25mm VC mids commonly offered by Scanspeak, Seas and others just don't cut it in the max SPL department. If I'm building a big 3 way, I'd at least want good power handling for the output advantage most people would expect.
A small mid that's good down to at least middle-C (262 Hz), efficient, yet linear to 4-5 kHz even off-axis would give the option to use a small (say 3/4") dome for consistently wide dispersion. I voted 5" NBAC. Not sure if any 5" driver can do this; the Satori TeXtreme 5" looks like it's good to maybe 3.5 kHz. That might be good enough to mate with a good 3/4" tweeter like a Hiquphon. In fact, I probably need to try one... but they're pretty damn pricey.
I would like to have the excellent MR13P motor combined with a NBAC or CAC aluminum cone. Same applies to the MR16P. These Satori midrange drivers are very high quality, but they need a diaphragm that does not break up within the pass band. Textreme or aluminum would seem the obvious choices. Based on the current SB/Satori price structure, an aluminum cone adds just a bit of cost, while a textreme cone adds a lot of cost.
If SB needs to stick with the SB15 or SB17 chassis/motor, then I vote for SB15CAC or NBAC, but with a surround, spider, and voice coil geometry optimized for midrange.
If SB needs to stick with the SB15 or SB17 chassis/motor, then I vote for SB15CAC or NBAC, but with a surround, spider, and voice coil geometry optimized for midrange.
Having just done a coax+woofer 3way, and having heard others from KEF and the like, I feel the shallow cone 5"/22mm tweeter/ with easy 4kHz xover looks and can sound really good. Of course, the TB W4-2315 units I used have lightweight bamboo fiber cones with flat midrange surrounds, a concave Al/Mg dome with tangential surround, and a rather benign set of responses.
These things have really been impressing me!
While I did not vote, because I have no stake in getting a pair, I feel the CAC cone is the best bet of what is listed, in the 15cm size with a 22mm dome, but I feel it is too deep in profile as is. TX(carbon) would be the best, but a flatter or less deep Satori Papyrus would likely be just fine. I don't think poly is a better option.
@leadcoma, that was a good sounding unit. Stiff aluminum waffle in the same plane as the aluminum tweeter, flatter profile too. However, the image shown is sans the tweeter diffusing ring. Really makes me wonder why these have not been 'cloned' by some Chinese mfr.
These things have really been impressing me!
While I did not vote, because I have no stake in getting a pair, I feel the CAC cone is the best bet of what is listed, in the 15cm size with a 22mm dome, but I feel it is too deep in profile as is. TX(carbon) would be the best, but a flatter or less deep Satori Papyrus would likely be just fine. I don't think poly is a better option.
@leadcoma, that was a good sounding unit. Stiff aluminum waffle in the same plane as the aluminum tweeter, flatter profile too. However, the image shown is sans the tweeter diffusing ring. Really makes me wonder why these have not been 'cloned' by some Chinese mfr.
has there ever been a coax bass and middome with the bass cone horn loading the mid dome .
or even further a bass cone a mid cone and a tweeter mounted in the middle so a triaxial but direct radiating not compression driver mid tweet like the bms triaxial
or even further a bass cone a mid cone and a tweeter mounted in the middle so a triaxial but direct radiating not compression driver mid tweet like the bms triaxial
Exactly. Tweeter isn't horn loaded by the cone which is why I prefer it over even the KEF. Good eye on catching the missing diffuser.
I also expected it to have been cloned by now especially considering China is where it was manufactured. It is not easy to manufacture that driver consistently. That said, poor consistency, even poor design, has never stopped anyone from selling into this market.
I'd like Zaph's ZA14 with a coated fiberglass cone and 3/4" tweeter with a resonator array for the backwave like Kef Meta and @Patrick Bateman's experiments
EDIT: and a flat foam surround
EDIT: and a flat foam surround
A coax that works well will need a lot of r&d, just look at the seas MR18REX it 'looks' right but the result is not great.