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Old 29th September 2012, 10:11 PM   #31
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Originally Posted by Joachim Gerhard View Post
They have a patent on bended or curved cabinets. Actually they are not easy to manufacture.
I imagine not! Then again, people make snare drums all day long...
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Old 2nd October 2012, 10:36 PM   #32
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Yes, ones you have ramped up production you can do any shape i suppose. Building a sucessfull loudspeaker cabinet, one that sounds good, requires special skills though. I thought about a solution that is easier to make then post 12 and i will draw that up when i come home. Still i will also follow the design in post 12m so we have two alternatives.
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Old 3rd October 2012, 10:20 PM   #33
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Tomorrow i will measure the drivers in a 1,2m x 1,2m standart baffle. I will measure amplitude response ( on and off axis ) and phase. Also acoustic center and distortion.
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Old 3rd October 2012, 10:58 PM   #34
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I'm looking forwards to seeing the results
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Old 4th October 2012, 12:06 AM   #35
Einric is offline Einric  United States
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I ran a quick sim of this woofer and it looks really great in a pair.
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Old 4th October 2012, 12:29 AM   #36
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Interesting design of the crossover with the mid woofers reversed in phase. I think you used the 8 Ohm version of the mid woofer.
You get a flat impedance curve and a flat amplitude curve. Over 200 Hz the group delay looks great too. Very inspiring.
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Old 4th October 2012, 12:32 AM   #37
Einric is offline Einric  United States
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Yes, I used the 8Ω version.
Do we yet know if these woofers are going to hit the similar $65usd price point of other similar sized SB Acoustic midwoofers?
Crossover costs with good components only runs $80usd, This could be a really nice affordable TWW setup.

Last edited by Einric; 4th October 2012 at 12:43 AM.
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Old 4th October 2012, 12:46 AM   #38
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No, they are rather more expensive, sorry. At this moment i only know the retail price in Germany so i have to check what they cost in the US. I do not know the price of the tweeter yet but i can find that out for you.
My plan was to start with a L/R 4th order and then work down to Butterworth 3rd and L/R second. Ultimately i could try your Bessel approach or even first order.
In general i found that less components in a passive crossover sound better when certain limits of linearity and lobing are met. About the audibility of phase distortion a lot has being said but none conclusive. I made my own experiments in the 90th when we constructed a DSP based speaker at the University of Essex where we could switch between an L/R4 and the phase linear version of it without changing the frequency response and the lobing. That is a long story and i may tell more about it. In the meantime here is a primer on L/R networks :Linkwitz-Riley Crossovers: A Primer

Last edited by Joachim Gerhard; 4th October 2012 at 12:51 AM.
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Old 4th October 2012, 12:49 AM   #39
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I found this offer :Speaker Building Supplies from Madisound
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Old 4th October 2012, 12:50 AM   #40
Einric is offline Einric  United States
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Can't wait, they look really nice.
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