I am waiting for my house to be rebuilt and my surround sound system is in storage. The above speakers are 15 years old and I would like to know if it is possible to upgrade them by adding Linn's dynamic power supply to them. I have been told by Linn that the A320 speakers are no longer being serviced but the A340 is still being serviced by them. I would be grateful for any advice wammers can provide.