Hi,

Unfortunately for me, I let my nephew have access to my classic system with an ARC tube preamp - custom mosfet power amp and B&O DM 7's. Apparently there is severe damage to the high and low frequency drivers on both systems although the passive radiators are intact. Does anyone know of any US based repair shop for circa 1978 systems ?

Steve R.
 

Unfortunately I think you have the wrong site! DM7s are a fine speaker but are made by Bowers and Wilkins, a fine English speaker manufacturer. Not sure of the drive units used but this link might be helpful. I have DM12s myself!