Sorry for offline so long...
That StandLine looks like a transmission line array....
I like how you have the surface area and thus the volume pumping capability of a larger mid-bass with the speed and agility of the smaller transducers.
I wonder, if you put the 4 drivers into a 2 x 2 matrix, would you get better vertical imaging as well as horizontal
🙂ensen.
PS: My office PC was "upgraded" to faster MB, video, etc. but it seems the combination took a fatal exception to stability.
That StandLine looks like a transmission line array....
I like how you have the surface area and thus the volume pumping capability of a larger mid-bass with the speed and agility of the smaller transducers.
I wonder, if you put the 4 drivers into a 2 x 2 matrix, would you get better vertical imaging as well as horizontal
🙂ensen.
PS: My office PC was "upgraded" to faster MB, video, etc. but it seems the combination took a fatal exception to stability.
Holy seat, Batman!
I can't quite tell, but the scale seems to suggest you could use that port for venting more than air! In fact, it's big enough to sit on, heh, heh.
I'm curious, did you make it or is it a commercial offering?
🙂ensen
I can't quite tell, but the scale seems to suggest you could use that port for venting more than air! In fact, it's big enough to sit on, heh, heh.
I'm curious, did you make it or is it a commercial offering?
🙂ensen
More Details, maybe more than you want to hear.
This is a bit of an odd beast, (2 actually).
The drivers are Adire Maelstrom 18 tuned to 20Hz with a 245L / 255L vented /sealed Sonotube and 400w mono Audiosource Amp 3 on each.
It’s not quite finished, but it does have a good portion (7") of the 33" X 8" port sticking out the top. The prototypes I made with the Sonotube’s tall enough to fit the port flush just didn't sound very good compared to the version with a smaller enclosure. The smaller diameter ports that were shorter (4", 6" dia and many combinations of multiples) just didn't get the port speed down low enough to stop Cuffing at 20Hz (anything above 18m/s per WinISD).
I’ve done three Volumes and about 6 different port configurations while playing test tones from 15-45Hz and the version with the port sticking out performed the best in both listening tests of Music / HT and was easier to get the tuning spot on, it was also just much tighter sounding IMO, so I just left a portion of the port sticking out and made it a shelf for some useful function. Right now my port speed is way down to 15m/s and I can’t make it produce any port noise no matter what.
My conclusion is that a enclosure size too big just didn't sound as good as the smaller enclosure, the port sticking out was just a side effect with some usefull attributes.
I have planes for a valve on top to open and close with a knob so that the sealed version will be a .5Q 255L, or a 20Hz tuned 245L with the port open.
This is a bit of an odd beast, (2 actually).
The drivers are Adire Maelstrom 18 tuned to 20Hz with a 245L / 255L vented /sealed Sonotube and 400w mono Audiosource Amp 3 on each.
It’s not quite finished, but it does have a good portion (7") of the 33" X 8" port sticking out the top. The prototypes I made with the Sonotube’s tall enough to fit the port flush just didn't sound very good compared to the version with a smaller enclosure. The smaller diameter ports that were shorter (4", 6" dia and many combinations of multiples) just didn't get the port speed down low enough to stop Cuffing at 20Hz (anything above 18m/s per WinISD).
I’ve done three Volumes and about 6 different port configurations while playing test tones from 15-45Hz and the version with the port sticking out performed the best in both listening tests of Music / HT and was easier to get the tuning spot on, it was also just much tighter sounding IMO, so I just left a portion of the port sticking out and made it a shelf for some useful function. Right now my port speed is way down to 15m/s and I can’t make it produce any port noise no matter what.
My conclusion is that a enclosure size too big just didn't sound as good as the smaller enclosure, the port sticking out was just a side effect with some usefull attributes.
I have planes for a valve on top to open and close with a knob so that the sealed version will be a .5Q 255L, or a 20Hz tuned 245L with the port open.
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