Hello again,
I had another thread about making a junior woofer tower, but I starting thinking about making one for my Martin Logan speakers. The electrostat panel in this is 40" tall and has a crossover of 4xx Hz. I have a subwoofer, so I only need the tower to go down to about 50 or 60 Hz or so. I would like it to be able to play orchestra at full volume, but I realistically don't do that very often.
My main question is whether to try for open baffle folded frame or sealed box.
Of the little bits of reading I did, the differences were:
Sealed has more SPL at low frequencies and more even and predictable freq response.
Open baffle is supped to "match the dipole radiation pattern of the electrostat panel better" (whatever that means in real life) and excite less room modes.
Ideally I would like the tower to be narrow for aesthetic reasons, and also because the sound source would be closer to the panels. I am unwilling to use a flat baffle, so it would be something like a H or U frame. Active XO and EQ will be used.
As for SPL, I am not sure what numbers I am aiming for. I ran the linkwitz calculator, and for something like 4 x 8" woofers ( I just used the surface area of a 8" woofer and multiplied by 4), I would get something like 104 dB (sealed) and 93 dB (OB) at 50Hz. I would slightly prefer to run 6 x 6" just for the narrower width, although it is a few db quieter. Also I would prefer to use the Hivi drivers from Parts Express because I like the look of the dust-cap-less inverted dome so sorry for being petty.
Can anybody give suggestions for which style of case would work better for my requirements? (50-400Hz, able to play somewhat loud)
Thanks
I had another thread about making a junior woofer tower, but I starting thinking about making one for my Martin Logan speakers. The electrostat panel in this is 40" tall and has a crossover of 4xx Hz. I have a subwoofer, so I only need the tower to go down to about 50 or 60 Hz or so. I would like it to be able to play orchestra at full volume, but I realistically don't do that very often.
My main question is whether to try for open baffle folded frame or sealed box.
Of the little bits of reading I did, the differences were:
Sealed has more SPL at low frequencies and more even and predictable freq response.
Open baffle is supped to "match the dipole radiation pattern of the electrostat panel better" (whatever that means in real life) and excite less room modes.
Ideally I would like the tower to be narrow for aesthetic reasons, and also because the sound source would be closer to the panels. I am unwilling to use a flat baffle, so it would be something like a H or U frame. Active XO and EQ will be used.
As for SPL, I am not sure what numbers I am aiming for. I ran the linkwitz calculator, and for something like 4 x 8" woofers ( I just used the surface area of a 8" woofer and multiplied by 4), I would get something like 104 dB (sealed) and 93 dB (OB) at 50Hz. I would slightly prefer to run 6 x 6" just for the narrower width, although it is a few db quieter. Also I would prefer to use the Hivi drivers from Parts Express because I like the look of the dust-cap-less inverted dome so sorry for being petty.
Can anybody give suggestions for which style of case would work better for my requirements? (50-400Hz, able to play somewhat loud)
Thanks
U- and H-baffles of the same depth should have similar SPL curves, but the H-baffle has a more symmetric figure of 8 dispersion pattern which minimizes room interactions. I chose the U-baffle because of the more pleasing looks when using "naked" drivers. Also for higher frequencies the H-baffle would introduce some nasty diffraction and reflection effects for the direct sound wave. Not sure if this matters at 300-400 Hz though.
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The Seas L26ROY 10" Subwoofer The Madisound Speaker Store
These work well in the Orion speakers, and can be used sealed too, side mount them open baffle like Gainphile does for a slimmer profile?
Gainphile: S20-Z Compact Open Baffle using Zaph Kit
These work well in the Orion speakers, and can be used sealed too, side mount them open baffle like Gainphile does for a slimmer profile?
Gainphile: S20-Z Compact Open Baffle using Zaph Kit
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