Original units are still available and cost around £30. Talk to your dealer and he can order you one.

Thanks Guys,

I will call my local dealer on Monday.

Have a great Christmas!

Steve.

Hi,

In case anyone else has the same problem, here's the solution for future reference:

The Penta bass speakers are still available new from B&O, part number 8480197, UK price (December 2007) £19.75 each inc. VAT.  Penta midrange speakers are slightly more expensive at £25.00 each, the part number for these is 8480106.  I didn't ask about the tweeter, as this looks strong enough to withstand a nuclear blast!

I'm considering "toddler proofing" my lower two bass speakers in each column by bolting on plastic speaker grilles inside the fabric covers to prevent similar damage in future.  Has anyone else tried this?

Happy Christmas everyone!

Steve.

I actually found an oem source for the midranges at $6 US each.  The only problem is the ones in the pentas don't have a flange since they're recessed, whereas the oem ones have a square flange, so you would need to know how to use a lathe to cut the surround into a circle shape.  Given that, it would probably be easier for most to just use the b&o ones.  Unfortunately the specifications are pretty poor.  If mine ever died I'd probably just replace them with a better driver and try to tweak the cross-over to accommodate it.  The tweeter is actually a high quality piece - a 19mm tweeter made by SEAS for b&o, although the only difference I can tell between the one made for the pentas and the original SEAS one is that the penta one is 8ohms while the original SEAS one is 6ohms.  I guess b&o didn't feel like worrying about impedance matching in the crossovers, and decided it was easier just to tell SEAS to make them an 8ohm version to match the 8ohm woofers and 4ohm+4ohm midrange pairs.  Unfortunately I was never able to nail down the original manufacturer of the woofers.