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Great looking arrays. Any chance we could see some close-ups of the metal finishing? I've played around with chemical patinas and am always curious to see what others have done.
Acetic acid and sand. I had never heard of that treatment. What strength acetic acid did you use? I have to say I like the results. The lack of nasty inorganic acids (sulfuric, nitric, or hydrochloric) to dispose of is also a big bonus.
Tanks Micheal for the link to your blog,I had a good look at your set up. Nice place you've got,are you an artist painter ?Are you planning some acoustic treatment in a near future ?Guy 13
My wife is an artist painter. It's her atelier, so acoustic treatment will not be done
My current system, two AE Dipole 15 woofers in offset H frames and a Lowther PM2C on an OB. Biamped with 200 W per channel solid state amps and a dBx Driverack PA active crossover.
P.S. to Early B.:I have often wondered about whether an OB monitor were feasible. Thanks!
Open question(s) to OB fans:Can any driver, be it a tweeter, midrange, or woofer, be used in an open baffle design? If the answer is no, what factors determine a driver's suitability?P.S. to Early B.:I have often wondered about whether an OB monitor were feasible. Thanks! Michael
Here's what you don't see very often -- OB monitors:
Have any more pics, they look interesting..
If you've never done one before, I recommend doing a project that someone has debugged, and that's technically sound - either one of Martin King's, or the Manzanita or ... (senior moment ... there's another one AC)
If you're using a passive crossover, the woofer should have high (>.7) Qt - which is why the Eminence Alpha 15a is used so often.You can use whatever you want for the midrange and tweeter; but if the tweeter isn't open-backed, that will effects your radiation pattern. (Which can be bad or good - it really depends on your goals - but probably explains why so many designs use wide /full range drivers)The woofer should be at least 10db more efficient than the other drivers, to compensate for baffle step loss.If you're using active crossover/digital eq, pretty much any drivers can be made to work. Just make sure your woofer has enough xmax and power handling.I can't recommend Martin King's quarterwave.org site enough - his articles are well written and the MathCad worksheets are phenomenal.Once you have the bass sorted (ie, your woofer is efficient enough, or you're using multiple woofs) then normal speaker design goals apply: low distortion, flat frequency response, smooth off-axis response (a big weakness of designs that use wide band drivers, alas), etc etc.If you have the space, dipoles are wonderful. I like Magnapans, but they need lots of amp. I like Quad ESL 57s, too, but they're also hard to drive, and don't play loud. I just built Martin King's Fostex Fe103/Eminence Alpha 15a project, and like a lot of what it does (I need to make a few changes to it after the holidays before rendering a more definitive verdict). If you've never done one before, I recommend doing a project that someone has debugged, and that's technically sound - either one of Martin King's, or the Manzanita or ... (senior moment ... there's another one AC)
