OH MY!!!! Just finished the open baffle speakers. Hooked them up to my main system. Turned it on and nearly fell over on the floor.....Holy Schiit! do they sound great! Using the B&W ASW608 subwoofer.....The spacialness is amazing, even without a hard wall behind them. My living room is very heavily damped so the bit of extended highs that the Tang Band speakers exhibit is very welcomed......These speakers have a total cost of $225 for the pair.....The plywood is extremely nice bamboo plywood from Lowes ($21 for 2' X 4' X 1/2", Drivers are $79 each, misc connectors etc rounds it out.......OK, they are not Magnapan MMGs or KEF LS50 Metas...But they absolutly bury and of my under $1000 speakers....As long as you use a subwoofer. As you can imagine bass rolls off fast around 100Hz.....I'll do some measuring next week and report.
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So a bit more listening....Sub woofer OFF and the Schiit Loki EQ engaged. 20Hz all the way up and 8K @ 3 oclock....400Hz flat and 2KHz at 9 oclock......VERY listenable without a sub woofer...Large room...24' X12' X8'.....
Nice job and glad you enjoy them! Try giving a 45deg chamfer with the router on the back of the driver holes.
From what I can tell on the picture, it might provide a bit more clearance, even if chamfered only over half of the thickness.
This must be world speed record! Congratulations!
https://www.diyaudio.com/community/threads/diy-open-baffle-info-needed.381808/
https://www.diyaudio.com/community/threads/diy-open-baffle-info-needed.381808/
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Yup, about three hours total time invested.....And I do all woodworking outside...Temperature was 12 degrees yesterday when I started!
No modeling...no design work....no nothing! Bought a piece of 24 X 48" bambo plywood....Decided on 18X24" so I'd have some left over for the stands....The curve on the sides were free hand....Pulled Tang Band drivers out of a pair of transmission lines I built (but sounded quite bad) and threw them into the middle of the board....Spent more time building the connection block than the whole speaker!......Hooked them up to a Pass Labs FirstWatt F5v2 and couldn't believe the sound! Connected the B&W 8" subwoofer and listened for over four hours! No, they are not Magnapans or LS50 Metas (which I compared them to), but they are easily as good if not better than B&W DM601, ELAC 2.0/6.5 and Klipsch RP600M.......Very impressed!
Great outcome!
I saw Juhazi post above with an Edge screen shot and got curious. I downloaded Edge and tried modelling your driver working out its diameter from the specs.
It seems like a symmetrical center driver mounting creates a peak and null response seen below on the left. The response looked smoother on the right with the driver moved up on the same baffle.
Did I do something wrong in Edge or is this an observed effect? If its real what causes the dip with symmetrical placement?
I saw Juhazi post above with an Edge screen shot and got curious. I downloaded Edge and tried modelling your driver working out its diameter from the specs.
It seems like a symmetrical center driver mounting creates a peak and null response seen below on the left. The response looked smoother on the right with the driver moved up on the same baffle.
Did I do something wrong in Edge or is this an observed effect? If its real what causes the dip with symmetrical placement?
^yes you did it right. The reason why offset "helps" is that distance to edges varies more and diffraction interferences spread and response gets smoother. At same time off-axis response gets even more variations and asymmetry.
https://audiojudgement.com/speaker-baffle-design-and-diffraction/https://heissmann-acoustics.de/en/kantendiffraktion-sekundaerschallquellen-treiberanordnun/
https://audiojudgement.com/speaker-baffle-design-and-diffraction/https://heissmann-acoustics.de/en/kantendiffraktion-sekundaerschallquellen-treiberanordnun/