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Old 25th June 2012, 04:11 PM   #61
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Quote:
Originally Posted by tsiros View Post
i actually have, but they sounded horrible... maybe i should listen to them in another orientation. i just placed them on my desk, flat on their backs. One, actually. didn't hear anything wortwhile
Well I see you have 12" drivers and not the 15" drivers.
I can't comment on the 12" drivers because I have not heard them, but I can say the 15" cast frame sounds quite a bit better than the Super 10" neodymium (ie just on the floor)

You need to build a cabinet for them.
One other thing, try running them 1.5 way you might find you like them much better

Last edited by Melon Head; 25th June 2012 at 04:14 PM.
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Old 25th June 2012, 05:03 PM   #62
tsiros is offline tsiros  Greece
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trying to make a cab. i'll be making the 5.6 from commonsense audio, the wide version. from 22mm plywood, glued and screwed together. I hope i do it right at least the plywood will be cut with 0.5mm accuracy.
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Old 25th June 2012, 05:37 PM   #63
zman01 is offline zman01  Bangladesh
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Quote:
Originally Posted by tsiros View Post
i actually have, but they sounded horrible... maybe i should listen to them in another orientation. i just placed them on my desk, flat on their backs. One, actually. didn't hear anything wortwhile
What did you try listening to - Opeth?
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Old 25th June 2012, 05:52 PM   #64
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Originally Posted by norman bates View Post
I don't agree with simulations, I agree with some measurements. Check out stereophile's review on Jamo r907, 18" wide. There is a dip where the mid driver is out of phase near 1,100hz (where the wave is 180 degrees out of phase and cancels), then a +db hump at 500hz (where the back wave is 90 degrees out of phase and adds) and rolls off. That's what you get with a 5.5" driver in the middle of an 18" wide open baffle. Notice that 1129/(18"/12") gives the dip a bit lower than 1,100hz. So a driver starts shorting out not at the middle but closer to or at its edge.

Jamo Reference R 907 loudspeaker Measurements | Stereophile.com

Something like this but hinges initially. Depending on music, you may not need a sub.
Click the image to open in full size.

If you could be 26" or more from speaker frame to nearest baffle edge, you'd get a nice +6db hump around 130hz (on the phy open baffle).


But that baffle is 66" tall, center 16" wide with 24" deep wings. Me wants. Me might builds.

That driver (an15) is reported to sound best past 200 hours. Any "papery" coloration will be almost totally gone.

Norman
Hello,

Great project! Sadly Norman is right here, the math and back wave do not lie. Through my experience with OB's anything below 22 inches in width you will experience mid band suck out. You can always add wings after the fact. Also, you can add card board too test. Good luck, looks like a very worthy project!

Ramon
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Old 25th June 2012, 06:33 PM   #65
tsiros is offline tsiros  Greece
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Quote:
Originally Posted by zman01 View Post
What did you try listening to - Opeth?
the ffff??? actually, yes, i was listening to the Drapery Falls

wait... i just got the joke. ha. ha. good one, zman.
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Old 25th June 2012, 08:54 PM   #66
zman01 is offline zman01  Bangladesh
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Tsrios,

Full range drivers don't particluarly work well with 2 things in my experience:

1. Thin recordings - and lot of rock/metal recordings are on the thin side
2. Complex music with compression - same as above...

Try something sweeter like Diana Krall - probably results will be better.
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Old 25th June 2012, 09:25 PM   #67
tsiros is offline tsiros  Greece
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I hope i enjoy them
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Old 25th June 2012, 10:20 PM   #68
zman01 is offline zman01  Bangladesh
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Originally Posted by tsiros View Post
I hope i enjoy them
Hope you start liking them more when you get them into a proper cab. If OB let's see what Melon Head does next.

Keep us posted!
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Old 25th June 2012, 11:00 PM   #69
tsiros is offline tsiros  Greece
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I put them on my desk
now listening to rite of spring.

except for the complete lack of bass, the stereo image is so transparent it feels the sound is coming from somewhere behind my monitor. I can feel that there is powerful bass here, since i can feel my ( 25mm , solid wood) desk shake, but i can not hear it. If i put my ear next to the speakers, there is something, but the highs are overpowering from that small distance.

I am going tomorrow to have the plywood cut.
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Old 26th June 2012, 01:35 AM   #70
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You should look here for help using the an12's.

They NEED a notch or 2 or more to sound good (well?).

Audio Nirvana Super 12 Cast Frame measured T/S
Audio Nirvana Super 12 Cast Frame measured T/S

"Michael chua did lots of work and graphs.
bad spike at 2.5khz but basically spikey from 2.5khz to 6khz.
but zobel (8.2uF and 22ohms), rl filter (1mH and 2.7ohms, shelves all highs down a little), and notch at 2.5khz (12uF, 330uH, and 15ohms) got an owner happy. A small peak at 5khz shouldn't bother anyone's ears."

norman
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