Howdy folks, while I got Sunosub II up and running, I'm not quite as happy with it as I am Sunosub III, so I'm re-doing it from the bottom endcap side. For one thing, the 36" long ports are either knocking about or resonating at 40Hz at high SPL (the dts intro introduces this not so nice rattling). I'm just going to slice off the bottom endcap, and use the rest of the sonotube material for the new design (which will still net me the same internal volume as I re-port the enclosure).
Current Sunosub II specs:
10 ft^3 internal volume 24" wide sonotube (43.75" internal height) 3 ports 4" wide 36" long (vent mach 0.04) Tuned to 16Hz
Future Sunosub II specs
10 ft^3 internal volume 24" wide sonotube (41.5" internal height) 2 ports 4" wide 23" long (vent mach 0.08) Tuned to 16Hz F3 around 23Hz
I may raise the FB tune to 17Hz (port lengths = 20") and the F3 drops to 21Hz.
(I'm leaning towards the FB=17Hz tune, yay or nay?)
I think I'll be okay with the vent mach at 0.08 (Sunosub III's is well over that, and I don't mind the port noise if it's present when listening at my favorite spot in the HT).
So this means my construction web page will be delayed as I do some more MDF cutting and routing (I'll be helping Trenton route some MDF circles, so the more the merrier!)
I'll update the revision when I get a chance.
PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs
Current Sunosub II specs:
10 ft^3 internal volume 24" wide sonotube (43.75" internal height) 3 ports 4" wide 36" long (vent mach 0.04) Tuned to 16Hz
Future Sunosub II specs
10 ft^3 internal volume 24" wide sonotube (41.5" internal height) 2 ports 4" wide 23" long (vent mach 0.08) Tuned to 16Hz F3 around 23Hz
I may raise the FB tune to 17Hz (port lengths = 20") and the F3 drops to 21Hz.
(I'm leaning towards the FB=17Hz tune, yay or nay?)
I think I'll be okay with the vent mach at 0.08 (Sunosub III's is well over that, and I don't mind the port noise if it's present when listening at my favorite spot in the HT).
So this means my construction web page will be delayed as I do some more MDF cutting and routing (I'll be helping Trenton route some MDF circles, so the more the merrier!)
I'll update the revision when I get a chance.
PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs
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