Yes. Actually more accurate moving mass than factory cones.
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Yes. Actually more accurate moving mass than factory cones.
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Edgewound...JBL Pro Authorized...since 1988
Upland Loudspeaker Service, Upland, CA
Great thanks! How long did it take you to get the spray application correct??Yes. Actually more accurate moving mass than factory cones.
Rob
"I could be arguing in my spare time"
Acording to the JBL specs the 2245 got a Mms of 185g.
When I had the aftermarket from speaker exchange,
the mass of all moving parts was 120g.
That wont work out to a Mms of 185g.
The airload on the cone isnt that heavy.
Coating was also nothing on the cone.
Instead of aquaplas I put some epoxy on the back of the cone.
My goal was to get it as rigid it could be.
Worked out pretty good in terms of rigid but doing some messeruments
it turned out I added a little to much.
The Fs was at 21Hz, the Qts at 0.33 and the Mms was 300g when I remember right.
It is a damn good sounding 18" with a foam surround, not really a JBL 2245 though.
I'd do it again, taking less epoxy. 50g was to much, maybe half as much and some
more liquid typ to get a thinner coating.
Wasnt looking to take that much but the used epoxy was thick,
I coudn't cover all areas so I ended up taking to much.
A friend of mine did the calculations, he coated his cones with some metall coating
out of the car equipment stuff. Don't know how his 2245 worked out or if he finished.
Call me blashemer, shake your head, I hope the numbers or my fail my help somebody.
looking for a JBL 2346 horn
Hi,
If you look at FaitalPRO spec sheets ( for 18" woofers ) they spec the moving mass ( Mms ) as well as the static mass ( Mmd ).
Quick subtraction shows that the airload for a typical 18" to be in the 22 - 25 gram range ( for the given Sd ).
185g - 120g - 25g = 40 grams ( so you really weren't that far off )
I kinda doubt that the 300g ( Mms ) figure that you derived ( from ?? software ) was actually accurate.
There's a thread or two around here about Mms inaccuracies being derived from all the Dayton DATS products ( as well as S+L's WT2 ) .
Edgewound...JBL Pro Authorized...since 1988
Upland Loudspeaker Service, Upland, CA
Edgewound...JBL Pro Authorized...since 1988
Upland Loudspeaker Service, Upland, CA
The used software was ARTA.I kinda doubt that the 300g ( Mms ) figure that you derived ( from ?? software ) was actually accurate.
Maybe the added mass, 97,6g, was not enough.
Gonna do some testing later this year.
looking for a JBL 2346 horn
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