RobH,

Nice!

Looks quite natural with that 12".

Are you going to create a passive network for this ?

BTW, I've seen a few other references to these large Heils that seem to indicate they're not as sensitive as what you showed in your first post that had them reaching 105db ( something like 5db less than that ).

Did you measure/calibrate at 1M with 2.83 Volts ?