Just got this together the other day to replace a 3677 I was using as a center channel. I needed something that could fit under my screen and wanted something to that would match my left and right closer (4722 with 2452h-be). Very happy with how this came out, sounds great. I considered using the D2430k, but I like the 4" aquaplas and Be CDs better after comparing them back to back.
I'm running this full active driven by a pair of NC400s using brutefir for processing with filters from FIR Designer and an RME fireface UFX+ interface. Keeping the noise floor low was a challenge, but the good interface plus a 12db pad from an autoformer worked well. I compared the 4722s with the network driven by my AVR to running with the active setup and the active config actually ended up quieter.
My build on left, 3677 right.
Dialed in response averaged around listening position
guts, 3636 autoformer and 100uf cap
bracing and damping
CD w/ spacer
"Rough" eq/xover, will refine this later.... 1/48 smoothing with 35 cycle window.
time aligned step response and impulse. Some room interaction here. I wanted to measure this outside, but winter and snow had different ideas.
native response of 2453h-sl on stx825 w/ spacer. There's a bit of a gnarly dip/phase issue without it.
All components without any EQ
Finally got some off axis measurements of something using the same waveguide.