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From the perspective of pumping of atmospheric pressure the ALE bass drivers might be more capable transducers. It or might not be so as well. To get 40Hz at 110dB in 5” it would take some excursion.  I am sorry but you can’t bend the law of physics. Pressure is excursion by surface. In horn we as the horns EQ. Let presume that a horn would add even 10dB then we still have a lot of excursion necessary. The ALE drivers have titanium with plastic suspension diaphragms. The plastic suspension diaphragms are horrible for excursion, they good only for bending. So, I presume that ALE made a very large FRP skirt to let the metal cone to have lower own resonance and some freedom to move. To do it all within 2.3T guy I am sure was tricky. I would pay money to see HOW the P160 is made. What I know about the compression drivers idea I would guess that  a compression driver with too much flux and light soft cone would not make since as it would requires  very precise, almost surgical compensation of back chamber. Since ALE does not have the adjustable damping for the driver then the result is not optimum. Still, I might pres that ALE knows something that I do not know, so I will give to them a benefit of doubt.


Here you can see three examples of suspensions I believe could be similar to ale drivers , as  ale and goto were yosimura labs employees 
before creating own companies to manufacture drivers.  In fact ale line of drivers were similar in design as YL while yosimuras designs came from rca designs.

You can see suspensions diameter gets wider as frecuencies go down. YL 55000 is supossed to go 150 hz, yl 75000 to 70 hz and YL 1250  to 16 hz.
55000 and 75000 are the same magnet structure with diferent diameter to the voice coil. 1250 is bigger and wider and  lots of  suspension.

Note that 55000 unit charges horn through the throat as contemporary drivers usually do unlike the other two that charges much like rca drivers , goto and ale.
55000 unit is a model marketed and designed suposedly by Mr. Kondo who owned YL for a while.I guess he credited the "contemporary" way of horn charging trough internal throat, or may be it was economical choice. 


YL kondo  55000 150hz





YL 75000  70hz? same magnet







YL 1250  16hz? bigger magnet






I,ve been using 55000 unit with 200 hz tractrix horn (500/700hz to 1k/2K) and never went  back to jbl 2482 or altec 290 on that horn.


I believe 1250 unit is like 4 inches throat and looks like ale should be.Cone material should not be equal. Looks like capable of excursion well above we are acustommed to.
May be 3/5 mm?   



Regards


Eduardo

 

 

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