So I took a moment and downloaded the PDF that RCA NUT shared. Firstly that is one big piece of furniture.
Continuing from there, I'd heard that RCA had used this speakers in some domestic products, but never actual seen anything. Wow.
Reading through the pages, I'm having a hard time with their alignment shim values 0.0001 inches (2.54 micron). Really? A human hair is something like 0.004 inches.
There is a nice exploded diagram on page 6 of the LC1 that is supplied with this console. I'm surprised to see a thin gasket behind the front surround. Gives me pause for thought on a future modification I was entertaining.
Have to say I was a little disappointed in the alignment procedure for the tweeter. Guess I was hoping for some kind of revelation. I've always used Pink or White noise and moved the tweeter until I get the widest/fullest response. I'll have to try a single tone and see if its any easier that way.
My impression of the LC1-A's is that they have always sounded best with a tube amp, and their worst with a solid state amp. Most people I know if they didn't like them it was for lack of bass or for being to forward in the voice. My contention has been that these speakers were built with a specific mechanical damping unlike modern air-suspension designs. Most modern amplifiers would add more damping, sucking the life out of the cone, so to speak.
Well, interesting thing hiding in the schematic for the power amp, an L-pad attenuator. So... the speaker is to loud with a 40 watt amplifier driving it, let's just add an attenuator. I would think this has to limit the effect of amplifier damping, resulting in more bass. I'm going to try this and see if I'm just reading to much into the design.
The output stage of the power amp has some real WTF stuff going on here as well.