Cabs like this are sold ready-made (so very cheap) in China's Taobao stores, and generally referred to as "labyrinth". Bass is definitely enhanced (low and strong). I like to mod them by inserting slanted dividers to lengthen and taper the "transmission line". There are a couple of threads documenting my "TLonken" efforts.
https://www.diyaudio.com/community/threads/supravox-8-tlonken-while-city-of-22m-laid-flat.393338/
https://www.diyaudio.com/community/...rkaudio-alpair-5-2-in-evansound-3-75l.393909/
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... other examples:
https://www.diyaudio.com/community/threads/desktop-transmission-line.391306/post-7150876
If compactness is paramount and the driver has low Qts (powerful magnet), the classic folded highly-tapered transmission line has the best bass clarity/depth/dynamics.
https://www.diyaudio.com/community/threads/desktop-transmission-line.391306/post-7150876
If compactness is paramount and the driver has low Qts (powerful magnet), the classic folded highly-tapered transmission line has the best bass clarity/depth/dynamics.
Hmm, T/S max flat using HR's slightly modded specs and assuming OEM specs are quite close:
Vented net volume (Vb) (L) = 20*5.48*0.59^3.3 = 19.2 L
Vented box tuning (Fb) (Hz) = 0.42*79.07*0.59^-0.96 = 55.1 Hz
F3 (Hz) = 79.07*0.28*0.59^-1.4 = 46.3 Hz, obviously only for very low power, nearfield apps, so presume of no use to you..........
Pioneer's classic BR = 5.48/1.44 = 3.8 L tuned to actual Fs makes for a mildly under-damped pronounced mid-bass, lower mids, i.e. typical classic party speaker, 5 W/1.0 mm, damp to 'taste'.........
Probably a decent compromise = the mean of the two = 8.54 L, 66 Hz Fb, wider BW classic variant, so extra LF = only 1.0 W/1.0 mm
All of course ideally need a hi-pass...........
Comparison of classic, averaged..........
Group delay ('ringing') comparison...........
Attachments
Perhaps somewhere in Dave’s archived plan sets? I’m thinking it was well over a decade ago that I built the one pair with removable suprabaffle that allowed for swapping of drivers.
For approximate reference to size - but not exactly the same internal topography - take a look at the Woden Vampyr.
https://www.wodendesign.com/Vampyr-V.html.
IINM, I built a pair of those as well, but for the newer FF 105WK. Dave will, of course be monitoring this thread and I’m happy to be corrected on any errata.
Understanding your intended use case will most certainly shorten the timeframe of your analysis.
Blink of an eye for some of us. I remember those speakers had impressive bandwidth for such a small driver.
jeff
