Fullrangedriver Forum

Innerconflict · 2010-06-04 18:52:31

Pair of 10" and a pair of 8" dual cone "Twintone" drivers made by RSC. There are pics and specs for the 10" units in the FR speaker database.

The 8's and 10's are identical builds except for size. Accordian surround (I will change them to foam or rubber surrounds in the future) , paper cone, paper whizzer cone, stamped steal frame.

10's will be mounted in the back deck of a hatchback , firing up at the hatch glass , the 8's will be mounted in some small angled boxes (aimed up at the listener) mounted on the doors(over the stock driver hole), and will be loaded into the car door's interior volume via the stock 6" driver's mounting hole.

I am contemplating using a peice of cloth carpet padding to "block" the original 6" door driver's opening , thus providing some barrier between the 8" driver and the not-so-well sealed door interior ('93 escort) , and also to act as an "aperiodic" or resisitive loading into the door.

I figure with a pair of 10's and a pair of 8's that are both fairly efficient (10's are about 93db ) , have a high Q , and rising high frequency response , these should work fairly well as FR auto units powered off a decent (Kenwood) head unit.

What should I use to treat the cones against sun and moisture damage ?

Thanks for your insight !................................Blake

ronbrady · 2010-06-07 16:39:06

Hi Blake
It is hard to beat polyurethane varnish for protecting things. It will also provide an added benefit of stiffening the fibers of the cone somewhat.
If you thin the poly out a bit it will soak into the fibers and not add much weight. I have tried both oil based and water based poly and for the cone treatment I prefer the oil base because it doesn't distort or disolve the existing binder for the fibers. One coat on both sides enough to just wet the fibers and that is it. Just let them dry for a few days and you are set. I think that if the accordian surrounds are still in good shape you should leave them alone. There is no advantage to foam surrounds over accordian surrounds but the accordian surrounds might actually prove to be more durable.
Just my two cents!!!
Ron Brady

Innerconflict · 2010-07-24 17:03:38

ronbrady wrote:
Hi Blake
There is no advantage to foam surrounds over accordian surrounds but the accordian surrounds might actually prove to be more durable.
Just my two cents!!!
Ron Brady

Hi Ron,

Thanks much for the info.

I do disagree with your thoughts on foam surround VS accordian pleated paper. My personal experience shows that the foam surround made a HUGE difference in the midrange and bass reproduction , while seeming to impart no detriment upon the treble reproduction.

After the switch from the pleated paper to foam on my 'Rads , the bass became MUCH more dynamic, and seemed to gain about an octave of extension (no joke) . There was also a slightly irritating midrange honk that went bye-bye when the foam surround came to town.

The stock surrounds seemed to be in good shape, with the stock black colored treatment goo still there and even still a lil tacky. Amazing after 50 years !

None the less, the surround "mod" was very worthwhile , and completely transformed the speakers from a good sounding driver to an excellent sounding driver.

Maybe newer style pleated/accordian surrounds that use treated cloth rather than paper are better ? I don't know.

................................Blake

Fullrangedriver Forum

#1 2010-06-04 18:52:31

Using some old FR units in my car , weatherproofing advice needed.

#2 2010-06-07 16:39:06

Re: Using some old FR units in my car , weatherproofing advice needed.

#3 2010-07-24 17:03:38

Re: Using some old FR units in my car , weatherproofing advice needed.

ronbrady wrote:

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