Beovox m70 woofer change

13 replies
W(
Offline
Whitenoize (archived)
Bronze
Posted January 8, 2012 at 17:08 GMT
#1746247

 

Hi folks.

I have a pair of the m70´s and I´m very pleased by the sound and looks. One thing that annoys me is the noise in one woofer. I think the reason is because of the high age of these old mates. 

To day I decided to try to fix the problem or at least see if everything was ok cosmeticly behind the "frames". When I opened them up, I discovered that it looks like the speakers have different woofers. The funny thing is that both woofers is marked "seas 25F-EWX" which are the orginals in this speaker. The differens is the dome and the magnet (pictures). It is also harder to push down the membrane on the woofer with the smallest dome, and this driver reminds very of the woofer in the s75´s, the seas 25F-EWR. But the woofer who has the distortion problem is the one with the large dome. I have heard someone mention it was a woofer-change in beovox m70, but did the woofer change started in my pair? lol :)

But seriously, anyone who knows why the woofer-change happend?

I also wonder, are these woofers the same woofers although they look different and can the woofer be fixed? - By the way, let me know if any of you has this driver for sale, I really would have this fixed :-O

Thanks, and sorry for my bad english :P

Marius.

 

To the right, "large dome driver", left "small dome driver"

The lowest driver is the one with large dome..

D(
Offline
dmacri (archived)
Bronze
Posted January 8, 2012 at 21:34 GMT
#1746248
It's possible the one with a larger dust cap had been repaired and a new, larger dust cap installed. If you gently press on the speaker cones do you hear of feel any scraping sound? If so, there is some damage to the speaker.
TO
Offline
tournedos
Bronze
Posted January 9, 2012 at 04:28 GMT
#1746249

I can't say from the pictures which one looks original, but for reference, here's a head-on shot of some certainly original Seas 25F-EWX woofers. I built these around 1990.

Seas themselves might have altered some mechanical parts during the production run, but I'd be very surprised if they had altered the voice coil diameter and still called it the same driver.

W(
Offline
Whitenoize (archived)
Bronze
Posted January 9, 2012 at 09:07 GMT
#1746250

Thanks for quick feedback!

Dmacri: It´s possible, but that dosen´t explain the different magnet.

I have tried gently to press on the cone on the noise making woofer, but I cant hear/feel anything of scraping sound. I dont know where the problem is, because the driver is only making a low volum brr brr sound when the woofer is in the cabinet and plays a low frequency sine wave. (In free air the brr brr noise disappears) Someone who experienced this before? What could be wrong to my woofer?

I know it´s not the cabinet who makes the noise because I have changed woofers and when the other driver plays in the same cabinet, the noise is gone.

Tournedos: Nice speakers you got there :) Yes, that looks like a 25F-EWX. Apparently they are in several versions visually, cause on your drivers you cant see the cord attached to the membrane.

I agree with the change in production parts, maybe it´s the same woofer, just look different.. But that´s annoying :P

Marius.

RI
Offline
richhaffner
Bronze
Posted January 9, 2012 at 12:29 GMT
#1746251

Here's a shot of one of my woofers.  Matches your "large" dust cap version I would say.

 

B(
Offline
Blackrix (archived)
Bronze
Posted January 9, 2012 at 12:42 GMT
#1746252

One of the woofers might have been replaced in a repair and might have had an update between the time it was released and repaired, that would explain the difference. 

W(
Offline
Whitenoize (archived)
Bronze
Posted January 10, 2012 at 05:18 GMT
#1746253

Blackrix: Yes, it would. I think actually that is the case 🙂

Now it´s all about getting a new seas driver(s) because it´s not 100% intact.(And I'm certainly not the only one looking for this, I think)😁

Anyone knows which speakerbrands/models were fitted with these seas 25F-EWX drivers other than the m70´s?

I think this is the way to get the replacements.

Thanks for the answers!

Marius.

SH
Offline
Søren Hammer
Bronze
Posted January 10, 2012 at 05:34 GMT
#1746254

I think that Beovox S60's and S75's were fitted with the SEAS 25F-EWX, will have a look at mine when I get home from school 🙂

B(
Offline
Blackrix (archived)
Bronze
Posted January 10, 2012 at 16:24 GMT
#1746255

Have you tried Google?

SH
Offline
Søren Hammer
Bronze
Posted January 10, 2012 at 19:29 GMT
#1746256

I did not read the OP close enough 👍

As for using google, there isn't much knowledge around on the net about this topic. Most speaker users most likely never remove a driver, let alone read and write model numers down/taking pictures 🙂

or
BeoWorld Gold Membership card
Join BeoWorld

Register to access the forums, reference material, and exclusive member benefits — including our monthly prize draw.

Become a Member

December 2026 Prize Draw

Gold Members Only

As a Gold member you're automatically entered into our exclusive prize draw — your chance to win iconic Bang & Olufsen products. A unique benefit of BeoWorld Gold membership, every draw brings a new opportunity to win something special.

View Prize Go For Gold