I'll try to diagnose my Duet next time (I just left there). I remember they sounded very rich to the point of boomy/muddy; the rear port TL really just a deep slot (I think).
Hopefully this weekend. Immobilized by second-hand flu from Spring Festival holiday returnees -- the norm post-COVID....
Too late tonight to audition, but I tried taking measurements -- TL more sophisticated than I had thought and needed some guesswork on inner dimensions. Drawing to scale in mm. Slot 10x145 opening, ~15x145 cross-section; 10mm of disintegrated foam at the mouth. The inner two TL boards probably thinner than 15 used everywhere else. 10mm radius round-over except bottom.
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Thank you very much, this is something I can work with!
Mine will be build in solid Western Red Cedar!
Is there any chance of getting the filter values?
Mine will be build in solid Western Red Cedar!
Is there any chance of getting the filter values?
Yes outside. Baffle 15mm and rest feel the same. Not sure my multimeter's L C would work well without full disassembly; anyway I didn't bring it with me today. One C can be read, another possibly....
I listened to the Duet today and here are my thoughts. Rear ported so keep away from wall. Tweeter should be listened to on-axis and not raised ear-height (sloped to point too high), otherwise a bit dark and lost too much incisiveness/detail/imaging/air. But the sloped baffle for time offset should be kept, assuming the XO ensured alignment which must be designed and tested. I experimented with different head height and head tilt to arrive at this conclusion, namely head straight but above tweeter so as to be on-axis for the intended listening distance.
The Duet soft cone & dome had easy-to-like fuller sound but less inner clarity at all frequency than harder membrane drivers or SOTA like Textreme/Be. Frequency response judged by ear to be quite good if on-axis; TL rear port contributed mostly 35-55hz, output as loud as the driver front at 47hz. Auditioned in a large space far from walls.
The Duet soft cone & dome had easy-to-like fuller sound but less inner clarity at all frequency than harder membrane drivers or SOTA like Textreme/Be. Frequency response judged by ear to be quite good if on-axis; TL rear port contributed mostly 35-55hz, output as loud as the driver front at 47hz. Auditioned in a large space far from walls.