So I decided to do a quick sim with the SB26STAC and the SCW636. The SCW636 is response is the one I showed before with 200 X 350mm baffle, and the proposed 1.8Khz crossover freq (note I didn't check the specs on the tweet to see if that was reasonable).
Apart from the low sensitivity (would really benefit from two mids in paralell though then impedance will be quite low) it doesn't look too bad. I didn't try and optimize the phase, because I'm using a guess of -15mm Z offset for the tweeter. also I've not used vituixcad traced files before, so I'm uncertain as to whether it has calculated minimum phase or not (I would normally do an extra step to extract the min phase).
So without too much crossover trickery it seems to be fairly easy to get +- 2db 100Hz to 20Khz with this driver combo.
I'm not sure about the shelving on the tweeter. I've never actually tried it (will be on my latest iteration of my MTM crossover)... There is something that just seems a bit wrong putting an inductor in series with a tweeter 😉
Anyway thought I'd post it. It was just a nice exercise to keep my brain ticking over 😉
Tony.
Apart from the low sensitivity (would really benefit from two mids in paralell though then impedance will be quite low) it doesn't look too bad. I didn't try and optimize the phase, because I'm using a guess of -15mm Z offset for the tweeter. also I've not used vituixcad traced files before, so I'm uncertain as to whether it has calculated minimum phase or not (I would normally do an extra step to extract the min phase).
So without too much crossover trickery it seems to be fairly easy to get +- 2db 100Hz to 20Khz with this driver combo.
I'm not sure about the shelving on the tweeter. I've never actually tried it (will be on my latest iteration of my MTM crossover)... There is something that just seems a bit wrong putting an inductor in series with a tweeter 😉
Anyway thought I'd post it. It was just a nice exercise to keep my brain ticking over 😉
Tony.
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+1 The diffraction bump is highly audible and there is also a directivity shift in there that draws attention to it. The right baffle can put a diffraction dip where the driver bump is.
Did you ever build this? Wide baffle and great driver selection. The huge voice coils in the morels would give a certain kind of solid sound that doesn't come out in specs.