Originally Posted by
GordonW
I just compared the T/S parameters of the 2235 to the 124A... the 2235 spider is NOT a good match. The 124 spider is SOFTER (ie LESS stiff) than even the 2235 spider!
All is not lost, though... there is an aftermarket spider even softer than that specified for the 2235, IIRC. Aftermarket spiders are usually rated in a scale of A to E, where A is extremely soft (low stiffness) and E is VERY stiff. The 2235 spider, in aftermarket parlance, is a "C" stiffness, IIRC... and there is another spider available in the same size that is a "B" stiffness. Also, there are a couple of Gauss replacement parts, that are even softer spiders (close to an aftermarket "A" stiffness), should that be necessary, upon results of testing.
Giskard, any further thoughts on sending me a dead 121 or 124 cone assembly, so I can look for suitable aftermarket parts to build up a 124 kit? I'd be glad to try and locate something suitable... it'd be a way to put this spider question to rest once and for all, too...
BTW: I was just playing around with the parameters of the 124A in a box modelling program. Has anyone tried one of these guys in about 2 cubic feet with a passive radiator? I modelled one with a PR of the same area and stiffness of the 124A, with about 4 times the cone mass of the 124A (14 ounces). With a 60Hz crossover, it'd have bass WAY down into the low 20s, with a predicted output capacity of OVER 105 dB (more than THX spec!) down into the mid 20s, in a moderate-size room...
Regards,
Gordon.