.After a few weeks of listening and playing around with component values, I've settled on the final crossover. I hooked them up over the weekend to get a good set of measurements for them which you can see below. All measurements were taken at a 30" measuring distance, 1/48 octave smoothing, and 4.7ms gate time. The SPL is accurate, but was not set at a specific voltage. Overall, the speakers should have a sensitivity about 85dB. The dips you see in the lower end at evenly spaced intervals are a severe room mode. I'll take some listening position measurements after finishing the crossover, which should smooth these out some as they will be in a different location in the room.
The first set is on- and off-axis curves out to 90 degrees and the polar response of those curves. The response shows good performance with a fairly smooth, wide-disperstion polar pattern. You can see the typical narrowing of a roughly 1" tweeter in the top octave as you get further off-axis, but overall nothing here to complain about. The slight peaking in the top end response of the tweeter is the soft dome breakup inherent in this tweeter and flattens out if you don't toe in to have tweeters pointing directly at you. At about 15 degrees off axis the peak is flat
The next set of graphs shows the distortion plots at roughly 85 dB and 95 dB. 95 dB at 30" is actually pretty freaking loud when you are in the same room measuring. I had to put in hearing protection for these sweeps. I apologize for the scale on these. The pictures exported kind of weird. The got really squished vertically and went to a 10dB octave scale on the export and I didn't notice it until I had already put my measurement gear away. My website editor also won't let me make them any larger on my blog. If you'd like to see bigger images, please click here and here.
But to explain it in case you can't see it that well, 85 dB at 30" shows a very clean measurement. Distortion stays below 1% down to below 100 Hz, which is pretty impressive for a basically 3" driver. The tweeter and upper mids are very clean at this level. At 95 dB, you can see the distortion in the bass starting to rise and now at 200 Hz you are getting about 3% distortion. However, with the exception of a small peak at 400 Hz, distortion is below 1% from 300Hz up and drops to 0.3% or below above the 400 Hz peak. Overall, given the small size of the drivers in this build and suprising bass output, I would consider these pretty impressive measurements.