Replacing the woofers in my Mission 732's

[system7]

Originally Posted by sreten

Hi,

No its not. There is no cosmetic trim. Baffle needs modding for other drivers.

rgds, sreten.

Hi,

yes it is!

rgds, steven.

Just a question of finding something that fits...
Economy SPW165

Frame size: 165mm

Overall depth (front of frame to rear of magnet): 75mm

Flange thickness: 3mm

Fixing holes: 4 x 5mm diameter on 175mm PCD

Cutout diameter: 150mm

maybe...

[sreten]

Hi,



Looks like you are right, and my apologies for saying the contrary.

rgds, sreten.

[spincycle79]

Wow, thanks for all the replies!

sreten, no, the sounds quality seems uneffected. I don't hear any buzzing or cracking.. it might be cosmetic, but I'm hesitant to turn up the volume incase I do damage these speakers - they're my only pair of speakers in the house!

The guy in New Zealand who repaired these speakers in a previous link just replaced the cones with black kevlar, not the entire unit.

So in terms of steps I need to take, do I just order one of those 8ohm drivers and take my chances? Also, it worthwhile to stuff some polyfill (as per the picture above)? The speaker comes unstuffed from the factory.


Thanks!

[sreten]

Hi,

If they are not cracks, just cosmetic discolouration, I'd spray the cones
with some black paint and leave as is. Better drivers would be good, but
very hard to pick regarding matching the original x/o.

rgds, sreten.

[lduarte1973]

maybe it´s time you diy some new ones ?

[merlin2069er]

Good luck. I tried looking for a tweeter replacement for a pair of Wharfedale Diamond speakers (no luck).

[system7]

Originally Posted by spincycle79

So in terms of steps I need to take, do I just order one of those 8ohm drivers and take my chances? Also, it worthwhile to stuff some polyfill (as per the picture above)? The speaker comes unstuffed from the factory.
Thanks!

People won't tell you this, but building speakers is not hard!

Most 6.5" drivers will work in a 15L box. You can play with stuffing and blocking the reflex ports to taste. You can add some cheap 10W wirewound resistors to the tweeter to match the levels. Nothing very critical here. This is not a studio monitor. Like I said, almost anything that fits will likely do, but we'd happily check a locally available contender for you on Qts and Vas an all that. Don't see why you couldn't file off the bumps and fit with bolts either.

[DavidL]

Originally Posted by system7

People won't tell you this, but building speakers is not hard!

Most 6.5" drivers will work in a 15L box. You can play with stuffing and blocking the reflex ports to taste. You can add some cheap 10W wirewound resistors to the tweeter to match the levels. Nothing very critical here. This is not a studio monitor. Like I said, almost anything that fits will likely do, but we'd happily check a locally available contender for you on Qts and Vas an all that. Don't see why you couldn't file off the bumps and fit with bolts either.

I respectively disagree. Not just "any" driver will give him good results. Yes, the QTS, FS and VAS need to fit the desired box size along with an impedance range very close to the original driver, similar frequency response AND driver sensitivity, otherwise it's a crap shoot. Designing a well done speaker IS hard work and not just plunking any driver that fits into the box.I'm guessing he doesn't want to have to wade through 5 or 10 different drivers to get one that kind of works.

[spincycle79]

Just doing some quick math, 130 millimeters = 5.12 inches. So would I be shopping for a 5 inch driver? or 5 1/4 inch driver.

lduarte1973, DavidL - I agree that a good sounding speaker requires more than dropping in a driver, I'll be trying my hands as building a speaker for the first time (that's for another thread). For this Mission, I'd just like it repaired and not sounding worst than the original design.


Thanks everyone for the replies!

[system7]

Mate, you need better than maths at this stage, you need the other engineering skills of SURVEYING and MEASUREMENT if you're gonna progress...



The other issues come later. First find some stuff that might fit. This is what we call being on the "Critical Path" to a solution in civil engineering terms. You do the groundwork first in simple terms.