Thanks some more guys!
Mike.... don't know the era, but here are the serial no's:
4435 SET 1 SN 261049 and 266112 w/2425H drivers
4435 SET 2 SN 281897 and 281905 w/2425H drivers
Can you estimate age?
A 'self-exiled' member we all miss applied his craft to all the X-overs, drivers, etc. Superb workmanship BTW.
Ian.....might be time to bi-amp indeed. I followed earlier advice and tried passive first. Experience so far with bridged K1 was not good - nuked some stuff bad. Two-channel mode provides enough volume but does seem to lack robust headroom at 100+ db.
For bi-amp, what do you think about a K2 for the L/R bottom and a K1 for the tops, or would a single K1 provide a reasonable amount of additional headroom?
This gear is used in a Control Room so endless opportunities exist to push the wrong thingy - and I do! Maybe some kind of 'bypassable' fuse system of some sort might be good here?
For those interested, the diaphragms are aluminum and sound somewhat 'clinical' to me, so I may be interested in a SS amp of different flavor that sounds a bit warmer for the horns. A tube set-up is out of the question as my wallet is rather bare. Suggestions?
Also, it won't be long before I get back with the forum members that were interested in a listen. Acoustics are almost complete - it's been a slow go.
Steve