Hi Matador, Foam rot is a serious thing as it can damage the pcb and electronics, causing malfunction, etc. I am not completely sure about which serial number has the improved foam, but I think 12xx xxxx might still have the old foam. My advise for proper action is not to apply self cut pieces of plastic. This will not help, because when foam rot is there, it is already damaging the pcb and components. The only way is removing the old foam and thoroughly cleaning the pcb and components.      

Thank you for the comprehensive answer. Obviously note the one I was wishing the most! I'm good to open them and what I fear is the glue the seems to hold the front panels. I'll do it as soon as I get or make new foam. In the meantime do you know if not using them will slow down the process (less heat) or as this nothing to do?

Don't worry about de-attaching the front panels and the glue strips holding them. Obviously, you will first have to remove all screws. After that, the glue strips will hold the speaker driver panel and the PSU/AMP panel in place. The glue strips function as gaskets. Nevertheless you can push a flat hand screw driver (actually & literally with a flat head), just underneath the panel, and push it up a bit. Do it slow, and as soon as it comes a Biot loose, move the flat head down a few centimeters, and so on. "In the meantime do you know if not using them will slow down the process (less heat) or as this nothing to do?" The heat inside the cabinet makes the foam deform. As Long as you do not use them, the process will of foam rot will not continue. Be aware though that the damage might already have been done. Some times, some of the copper tracks on the PSU PCB are eaten away. And sometimes that's even hard to see with the eye. But this is easy to solve with some by-pass wires.

Perfect, all I wanted to know. Thank you Kolfmaker. I Will update the forum when I'll do it.

Bought today two set of B&O white replacement foams: 10€ each. Even for a raddish like me it do not worth spendind time for DIY'ing an alternative solution. I will document the replacement operation here. PS: at least here in Paris, the most complicated step was to find a dealer selling spare parts. Most of the dealers don't do after sales and can't order parts references.

Matador, there is a series of YouTube videos that details the process of opening up the BL8000s.  It’s a good series — I used it myself to open both of my 8000s a year or so ago.   The series was created by Pyramid Audio in Austin, Texas.  Let me know if you can’t find it, and I”ll dig for it.

Found it, Thanks BeoFrederic, it will help.

Hi Guys, It's done, at least for one speaker. The other one will wait a bit since this is not a really pleasant experience. That will also allow me to compare Both speaker with new and old foam. Starting point: the Beolab with stand and fret off and obviously the new set of damping material. Login to view image Then take out the screws off: 6 for the amplifier plate, 12 for the speaker plate. All the same. You need to cut the rubber border use to damp the fret between the two front plates. Use a sharp knife. Login to view image The plates are still firmly glued to the pipe. Insert a flat screwdriver and gently pry off the plate. Then progress to the bottom. I used two very useful little tools Thant came with a garden tinsel from a Scandinavian well known brand to open up the two plates, one side after the other. Login to view image Login to view image Login to view image Login to view image Disconnect all that should be:

• One big socket between speaker plate and amplifier plate. (white/blue/red).
• One big socket (main power/Yellow) between the amplifier board and the cone.
• Two little connectors between the amplifier board and the cone (3 and 4 wires).

Beware, there is also a third tiny connector much larger (7 or 8 wires), you can disconnect it but it loops from the cone into the cone. Don't mistake it for the one  that must be disconnected and pull the plate while it is still attached. Login to view image Once everything disconnected, take out the plates: amplifier first, then speaker Here start the mess! Use gloves. Foam to be removed is located:

• Just above the cone.
• One the amp board, between the actual amplifier chip and the main board.
• In the gap between the speaker zone and the amplifier zone.
• One big piece in the speaker tube.

Login to view image Login to view image Login to view image The big speaker piece was in my case quite well, sticky and chewy but I was able to remove it easily in one part. All the other parts were in an advanced state of disintegration, turned into a sticky dust spread all inside the column. You're happy when you manage to take out a big piece!. Login to view image Login to view image Even the foam sealing between the pipe and the plates is rotted. you need to rub it to clean it. Login to view image The pipe was vacuum cleaned with the help of alcohol (90°, no isopropyl here in France). Login to view image Login to view image The amplifier board was opened after disconnecting the plugs and cleaned with a brush and alcohol. Login to view image To me this is the most scary part: I don't like rub a brush on those PCB with so tiny component. I'm not confident enough to know if this is ok or not and I'l afraid of breaking something or hurting a component. SO I did this carefully with a brush and a vacuum cleaner, take out the most of it but after this, it still remain some sort of sticky touch all over the parts. I think it still better the before. Login to view image Login to view image Before screwing the amplifier board to the Amplifier plate, you need to replace the foam between the chip and the board. Login to view image Then clean all the connectors, the speaker socket was particularly dirty. Login to view image Then you can start the actual foam replacement. Note that the new set has nothing in common with the previous. Around the bas port entry. Login to view image In the column, roughly in the middle behind  were the woofers are. Login to view image At the base (rear). Login to view image The V shaped one at the bottom of the long strips just above the amp section. Close the speaker panel and watch out for the speakers wires to go into the foam groove of the V shaped piece. Login to view image Correct placement of the foam pieces is are illustrated below. They should make a coffin for the two woofers. Login to view image Then, place the amplifier board, plug everything that need to:

• One plug between amplifier plate and speaker plate.
• 3 or 4 plugs between amplifier plate and cone.

Before closing the amplifier plate, add the remaining front base foam piece. Login to view image Close the speaker, tight all the screws (18) and check your new foam root proof Beolab 8000! Hope this helps.  

Thank you very much for the detailed guide and photos!