It's very impressive that the X1 can get to a 300hz crossover point with an 18" waveguide. There must be some heavy EQ to reach that point.
I wouldn't call it heavy EQ'ing at all...
The compression driver's diaphragm is 4" (not sure on the dimensions of the actual waveguide that it fires into),
and the bass driver from 300Hz on down is indeed an 18" (dual voice coil driver - with two 8-ohm voice coils in parallel).
And within 0.5db from a crossover in the analog domain! Wow.
We measured +/- 0.5dB across the entire band on-axis. I believe the mic was a foot away from the waveguide.
Yes, we were using the LIO X1 AMP, with it's active 300Hz crossovers on the bass driver (LPF) and compression driver (HPF)... ALL
in the analog domain.
Both Jason and Tom were there to witness it when we did the measuring (before and after all the adjustments that I made
throughout the day, and it wasn't looking nearly that good earlier on). I guess I was having a lucky day because it was like hitting a bulls eye when we nailed that response down!
I'm currently working on updating the schematics to reflect what we did last Friday, and then I'll be re-spinning the PCB. I can
only image it will sound better than the hacked up one that we were using.
While the room is certainly the most important part I believe in fixing the room with treatments and not electrically.
+1 (but some rooms can be very challenging)