What has this Ouverture picture got to do with the topic?🤔🙂

Leslie wrote:

What has this Ouverture picture got to do with the topic?🤔🙂

He didn't have a driver pic, so this one will have to do, some people can link pics, like, Beosound-?Beovox?-bass driver-foam surround.

So next time you want to present a Beogram 4000, just put a pic from a BM 4000 and we will know what you mean 😂😂😂

Hello,

Just to introduce me. If you want I have plenty photo's of refoamed B&O speakers, but I don't know actually if I may from Beoworld. I wander if the topicstarter has photo's of his repaired surrounds. The surrounds may not be disformed, we always send in a cardboard box.

I'not really a salesman, but a hobbyist, have a website with lots of do-it-yourself information since 1998.

Best regards, Fred

See link for pics. I have also a manual for the passive radiator on if I'm right the Redline 60.

These ones are propably used by the topicstarter: real foam like it should be.

Best regards, Fred

Audiofriends wrote:

Dear Sir,

With Google I came to this item and I would like to give a feedback. I have checked my mail till 3 august 2011 back (NL is blocked on Ebay), but I can't find someone witch has bought these items (must be the 4"AS-5 or 4"A-2) and later on bought one again. That should also be impossible if you mentioned the problem, because if a surround gets waisted at what reason whatever we provide normally a free surround with free shipment. If we made a mistake about that please contact us, you will get the money of the extra surrounds back. If you ordered bij Ebay with an EN-account: you can't order one surround, Ebay doesn't give the possibility.

Further the original surrounds are from foam, so the new ones need to be as much as possible as the original material. If foam gets pressed to hard, it's actually not really foam anymore. It often has become a hard, stiff, material with a smooth surface, witch also makes sounds of it own. If the basematerial is right (such as with original Tannoy surrounds) it may be a thin, not hard and supple surround. But then the material get's heavier per square inch and a bit like rubber. Also not the right material if you want to keep the surround (and sound) as much as original. If you look in the book of Vance Dickason it's clear.

The surrounds can mute the vibrations (resonances) of the membrane at the edge. If the surround is very thin and very hard pressed, this is not like original. Actualy, the surround will give his own sound. With a hard pressed surround the efficiency may be higher, just like the difference between cloth and foam surrounds at the Bose 802. But hard thin pressed or medium pressed hasn't to do something with the foam quality itselves. Only the hard thin one gives a more louder noise (efficiency) at higher frequencies but often will have a sound (high Fs) of is own, because it has become a kind of hard plastic, and isn't foam anymore like original. The Fs will be higher, the lower frequencies of the midrange will be (compared with the higher frequenties) less loud. If the surround is made from heavier material the efficiency may be lower and the Fs lowers.

I'm sorry about the centeringproblem. Have you mounted the surround just in line with the cone? Sold surround are always checked before shipping. And why didn't you tell it to me? I have a lot of PDF's for all kind of problems, especially in Dutch. Further I would be very pleased to see the two different refoamed speakers. And I can send you some testsignals, especially for the midrange, so you can hear if there is any difference and if I'm right with the above story.

Best regards, Fred

I wander if someone hase some decent feedback. Jokes are fine😁.

Best regards, Fred

I have used Fred's foam rings for some CX's and they were superb.

Stonk wrote:

I have used Fred's foam rings for some CX's and they were superb.

I've been on a lot of web sites offering surrounds, but to find a surround that fits exactly, is a lot of work searching, mostly the sellers offer the most populars, and finding one that offers the correct one is imposible, their websites with dimensions (if they have them) are badly set up, and many times they offer: fit for Beovox S80, S40, S50, S120 or whatever, an 8" driver in the diff. models isn't the same, the 8 " MSN from AF just doesn't fit into a S80 driver, it will fit the cone but never the basket.

What we need is a supplyer that specialize in B&O, just like Soundsmith, where we can order our cantilevers, and can see on the web, which cantilever fits which model.

A good Surround supplyer IMO should have a website where we, with the B&O model type and number, can, find the correct surround for our drivers, with the dimensions for control, some same model types has different drivers and the supplyers should pick up on this when a buyer tells him that the one for F.eks S45 do not fit his S45.

The Supplyer would get a lot of help from the forum if he would take on the big workload it would be to build a database, and deliver first class items.

There are good supplyers out there but non who has it all.

Dear Sir,

Why doesn't the 8"MSN fit? Can you tell the exact size witch doesn't fit? The 8"MSN has been uses >100x for these speakers without any problems. It's true that our website is out of date (.nl - .com is a clone of it). It's originally a hobby-site from 1998 and that can been seen. But can you tell me one supplier that does give all the sizes like we do, and the compliance? (http://www.audiofriends.nl/pdf/foamsurrounds.pdf). We are busy with a webshop, and are very active on Ebay. Actually we have been rather to busy to bother about the style of our website.

The 8"MSN isn't a 'special surround' like sometimes claimed bij other company's, but a standard on. Special made surrounds are expensive by making a special mould. We have made some for popular speakers like the 8"VF for the Vifa M21WG.

The size of the S40 (by customers)

A = 160

B = 179

C = 199

The size of the S80 (by customers):

A = 160

B = 182

C = 202

Size C of the 8"MSN = 194

Further isn't there any supplier that askes as many data to the customer as we do. It might be not plesant for the customer, but we need for instance the innerdiameter of the gasket. Other suppliers don't bother about this. The 8"MSN should fit perfectly, and I like to know why you think it doesn't fits.

A data base might be welcome for the customer (if you mean the sizes of the speakers) but isn't good for the seller, for he will give away a lot of information to other sellers. I have a database ofcourse, from my customers. So if you want a database you will have to get you hands out of you pockets and do it by yourself I'll guess.

You almost can't find surounds that fit exactly, couse they need a new mould then, and 3D drawings like we did on the 8"VF. Then the surrounds might be exact as before, but it's no guarantee. Also often the new surround must not be exactly like befor if for instance size C surrounds is the same as the size C frame. Than you don't have a possibility to center the cone right.

'A good Surround supplyer IMO should have a website where we, with the B&O model type and number, can, find the correct surround for our drivers, with the dimensions for control'  - See Ebay and our PDF-list. As far as I know (I haven't seen any proof) there aren't anywere in the world exact fitting B&O surrounds (if you mean than special made like original). Waist of time to search for it.

Best regards, Fred

I wonder why I don't read anything about shimming methods on Audiofriends and Goodhifi's website and maybe others as well.🤔

Have been watching a video on

Btw, I did 4 pairs Penta's (32 midrangers) and they all sound great!

Not to mention all the CX's....