In article , Mike Rivers wrote:
On 1/4/2020 9:21 PM, nickbatz wrote:
Assuming it's worth fixing them - if only to trade someone for something else - is it likely to make any serious difference what round 12" cone-shaped thing I put back there? Serious = commensurate with the quality of these speakers.
A passive radiator is just a driver without the motor. When you get an
"edge kit" you leave the original cone in place, so you don't have to
worry about matching the cone mass and stiffness, they thing that should
match the original is the stiffness of the suspension.
A lot of passive radiators, though, have the stiffness entirely the result
of the surround; there is no spider, no other suspension and so consequently
the surround has to be constructed differently and the surround needs to
be selected properly for the driver.
I have some Advent speakers that had foam rot. I'd never worked on a
speaker before so I was hesitant to operate on them, but figured that
for ten bucks or so I'd give it a try. It worked out just fine. The
hardest part is to get all the the old glue off the frame where the
suspension is attached.
In the case of speakers, the stiffness is mostly the result of the spider,
so you can swap out the surround with impunity without affecting the
driver Fs appreciably.
I got my kit from Simply Speakers. Their web site gave me enough
confidence that I could do the job, and they were helpful with some
pre-purchase questions. You might take a look and see if they already
know what you need and can supply it.
https://www.simplyspeakers.com/ of course.
Passive radiators aren't expensive. The stiffness on them varies. If it
were me, I'd get one of every kind that Madisound sells, try them in turn,
and see which one gives most accurate low end. Then I'd buy a second one
of that model for the other speaker.
Somebody who actually knows those speakers can likely do better, and it's
possible some place like Simply Speakers or the Speaker Factory in
Gathersburg, MD might know them.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."