actually, it measures almost exactly as it should.
(speed of sound) divided by the distance front driver edge to back driver edge closest distance
1129 / (39.4" / 12") = dip = 375hz = where driver front wave is 180 degrees out of phase from the back.
There should be a peak an octave below that where driver front to back wave is 90 degrees out of phase thusly adding.
375hz / 2 = 187hz (yours is about 175hz, I'd call it good)
So sucess and performs as it should.😎
And how does it sound ?????????????
Norman
(speed of sound) divided by the distance front driver edge to back driver edge closest distance
1129 / (39.4" / 12") = dip = 375hz = where driver front wave is 180 degrees out of phase from the back.
There should be a peak an octave below that where driver front to back wave is 90 degrees out of phase thusly adding.
375hz / 2 = 187hz (yours is about 175hz, I'd call it good)
So sucess and performs as it should.😎
And how does it sound ?????????????
Norman
Maceo Parker, Roots and Groove, Track 6, Pass the Peas. There is a drum solo half way through the track, accept the drummer is in your room. It is like someone hitting you with a cricket bat.
To critically assess the sound I need to rebuild the baffle out of Birch or Bamboo ply.
The Audio Nirvana drivers are without any doubt a level above Seas.
The Audio Nirvana drivers are without any doubt a level above Seas.
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Looking at the an10 plus the dual an15, once you get the 300hz hump and 1khz+ knocked down, that looks like a great project (but expensive). That's what most are looking for, a baffle about Jamo R909 sized, like the one you made. A few have made a similar full range plus 15's on 18" wide baffle (b200 with a pair of eminence alpha 15a drivers popular at audiocircle).
Ideally one can use different woofers rather than the pricy an15s for bass duty. Audio Nirvana states the an15 has a qts of .483 with 1mm xmax, 500hz downward, sensitivity looks to be 95db. The eminence delta 15a has qts .53 and 2.7mm Xmax and is 97db below 600hz 8ohm for $95. Or the eminence delta 15lfa has a qts .58 with 4.8mm xmax and 95db from 500hz down ($100). I'd look for something with a shorting ring, it help clean distortion up above 100hz, but they cost more also. Then again, eminence is pricey outside the US.
Norman
Ideally one can use different woofers rather than the pricy an15s for bass duty. Audio Nirvana states the an15 has a qts of .483 with 1mm xmax, 500hz downward, sensitivity looks to be 95db. The eminence delta 15a has qts .53 and 2.7mm Xmax and is 97db below 600hz 8ohm for $95. Or the eminence delta 15lfa has a qts .58 with 4.8mm xmax and 95db from 500hz down ($100). I'd look for something with a shorting ring, it help clean distortion up above 100hz, but they cost more also. Then again, eminence is pricey outside the US.
Norman
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I haven't had a chance to use the B5 yet, because I have been busy doing measurements, but it should make things easy to dial in the right crossover point
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This ain't much difference from having a box - with all those reflections from the wall so close.... ?
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I understand the box would go deeper, but I was thinking about the special qualities people associate with OB - the lack of 'boxy' sound - and wondering if placing the PHY baffle close to the wall is going to give those benefits when it's starting to look like a giant leaky box, with no damping or stuffing to be seen
you'd be suprised.........
I prefered a foam box around the backside of the driver, my wife didn't.
I thought it would sound bad, but it didn't. I was suprised, even that the wings were almost perpendicular.
Think of the phy video. Bernard has it right up against the wall, no foam around the back of the driver.
It cleans up the midrange compared to bouncing around a box then coming throught the cone. You can test it by placing an am radio in the speaker box (set at normal volume), install the drivers, then plug in the radio. You'd be amazed at the sound that is mixing with the frnt side of the speaker.
Norman
I prefered a foam box around the backside of the driver, my wife didn't.
I thought it would sound bad, but it didn't. I was suprised, even that the wings were almost perpendicular.
Think of the phy video. Bernard has it right up against the wall, no foam around the back of the driver.
It cleans up the midrange compared to bouncing around a box then coming throught the cone. You can test it by placing an am radio in the speaker box (set at normal volume), install the drivers, then plug in the radio. You'd be amazed at the sound that is mixing with the frnt side of the speaker.
Norman
These use the Dayton 10" Pro Woofers for LF duties in OB... and are cheeeeap!
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I had intended to send you a PM about possible matches for the 12.2 in an OB. 93dB area looks prime if I uses doubles per side. I didnt want to spend too much money, as my final goals is the AN15. Any other suggestions and which of thew ones you tested performed the best?
The Eminence Lil-Buddy is a very interesting 10" hemp cone driver. Not so much as a woofer with its limited excursion, and it doesnt go high enough to be considered FR. Still though, very interesting and uber-flat for a "guitar" speaker.
you mean as woofers ?
Like melon's 2x15" plus fullrange ?
I wouldn't make the huge phy baffle except for the larger full range (12" or 15"). It seems a waste for a 6" or an 8". If you are going fullrange plus woofers, use the small baffle (18" wide). But maybe you could use the phy with a an15 with another .5 woofer at the bottom to addd some weight (usually good).
To me the lil buddy is too pricey. A 10" with Qts that looks good for open baffle (.8) but .7mm xmax for $80 for smaller cone area, I'd look elsewhere. Looks nice and flat otherwise, maybe as a clone of the tekton design Lore.
I'd check those eminence 15's, more cone area and xmax for the price.
Maybe I'll get my alp12.2 back some day.....................
Norman
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