Quite overwhelming is it not. Are you using a woofer you have?I hate to sound lazy
I have a pair of Norman Labs Model 10 - two 10" sealed with awful tweeters and xover was thinking about trying with, but definitely open to building a cabinet from scratch and buying good woofers. I also just ordered a pair of the original JBL PT-F95HF waveguides. I see now that Parts Express also has a clone of it, but I'm ok sticking with the original - they are now $25.50 each.
The Normans you have should put the wave high enough. No stands needed.
Inside dimensions are 13.5” wide, 10” deep, 35” tall. How are you guys measuring/plotting the frequency response? I might like to invest in some basic equipment if it's not too expensive. I have a frequency/function generator already and I have the room calibration microphone that comes with a Yamaha RX-A1070 HTR. Would either of those have any usefulness?
Play the speakers with the tweeters unhooked. See where the existing crossover crosses the lows. You may be able to use that as the low part. Just add the wave and the compensation with the L pad.