I'd like to use two revised JBL 6012 mono amps (~1978) to drive my Tannoy Hpd315 monitors (Devon cabs) from the same era. Not being an expert at all, the instructions in the manual are not quite clear to me (http://www.jblproservice.com/pdf/Vintage%20JBL-UREI%20Electronics/JBL-6011~6012.pdf
I'd like to use the balanced inputs of the amps, but the amps don't have the matching/bridging transformers installed (nor output transformers), and the manual seems to indicate they are neccesary for using the balanced inputs.
Would it be advisable to connect the amp's balanced inputs to a balanced 600 ohm source and drive 8 ohm speakers without matching/bridging transformers (and output transformers)? What negative effect may come from the missing matching/bridging transformers? Just some loss of gain or no/bad sound? Extreme SPL's are not required but I am hoping to get good sound from them..
Any other considerations I should be aware of?
Thanks a lot for any ideas on this!