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Multi-Way Conventional loudspeakers with crossovers

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Old 27th September 2012, 10:08 PM   #151
badman is offline badman  United States
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That 2k is where the material stiffness fails. Look at breakup in compression drivers if you need more proof- it tracks material as well as size. The cone ceases to be a piston when it breaks up, thus along with any peaking, whether damped or not, the off-axis has variation. Note that in the 10" the beamwidth narrows BEFORE any breakup, it's a smooth rolloff until breakup.
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Old 27th September 2012, 10:10 PM   #152
tinitus is offline tinitus  Europe
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He is the evolution on my old room. Then a pix of the new reduced system in my new room.
nice gear and I your boat model, is that a Blue Nose ?
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Old 27th September 2012, 10:14 PM   #153
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The notchy hash doesn't take place with metal cones, until the failure of the material stiffness.
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The cone ceases to be a piston when it breaks up
thanks for the info badman. I'll be using paper for the bass & mid. How does one tell without being able to measure the driver yourself, that it wont breakup within a certain bandwidth?
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Old 27th September 2012, 10:16 PM   #154
djn is offline djn  United States
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nice gear and I your boat model, is that a Blue Nose ?
Yes, it is a not too detail Blue Nose. I am without a boat at the moment, but I hope to change that in a year or two.

Those fisrt speakers, the EV Patritian 700s had the 30 inch woofer firing out the rear. Those things rocked.
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Old 27th September 2012, 10:24 PM   #155
badman is offline badman  United States
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thanks for the info badman. I'll be using paper for the bass & mid. How does one tell without being able to measure the driver yourself, that it wont breakup within a certain bandwidth?
Well, breakup isn't inherently evil. Like with instrument speakers, some "hifi" speakers are operated well through breakout range, like the Audio Nirvanas. They're known to sound quite great, and you can see wiggles in their impedance traces (and FRs) that point to these, though they're relatively modest.

Most pro speakers will have their datasheets show the peaking and breakup behavior pretty obviously. 15"s it's usually 1kHz-1.2kHz, 12"s more like 1.5-1.8kHz, 8"s at 2k-2k5, etc.
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Old 27th September 2012, 10:29 PM   #156
tinitus is offline tinitus  Europe
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The cone ceases to be a piston when it breaks up.....
or it just lost its built in flex control mechanism, or inner damping
I believe only the really heavy coned subwoofer drivers have real pistonic behaviour

btw, it looks to me like quite many of the new pro woofer designs have severe breakup peak
probably due to stiffer cones
but I guess pro people dont care so much about a small peak, and like the stiff cone more
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Old 27th September 2012, 10:38 PM   #157
IG81 is offline IG81  Canada
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Interesting evolution DJN!

I had seen some, but not all of these over on AK.

IG
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Old 27th September 2012, 10:54 PM   #158
djn is offline djn  United States
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Thanks IG. The only ones I really regret selling are the EVs. But I used the money to buy this.

Click the image to open in full size.
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Old 27th September 2012, 11:47 PM   #159
tinitus is offline tinitus  Europe
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no regrets
oh, I see you sold that too too much work I guess
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Old 28th September 2012, 12:30 AM   #160
djn is offline djn  United States
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Yep, waaay too much work. I wish I had the EVe back.
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