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Multi-Way Conventional loudspeakers with crossovers

Sonus Faber Extrema clone
Sonus Faber Extrema clone
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Old 8th January 2019, 11:50 AM   #1
drf24 is offline drf24  United States
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Default Sonus Faber Extrema clone

I know this has been on here before but I am at a point that I need some help.
I have drawn the SF Extremas in AutoCAD using photos I scaled from known dimensions to get the general shape as close to the original as possible. I have sourced a set of KEF B139 for the passive radiators and a set of Chinese cloned Dynaudio tweeters.
The cabinet will be a laminate of 3/4" MDF with hardwood sides. I have had the templates cut from 5/16" aluminum plate which will allow me to cut the general shape of each laminate piece and then use a flush bit on my router to get them to the exact shape. Each template has 1/4" locating holes to be drilled and fitted with 1" dowels. The front plate that will eventually be wrapped in leather gives me the freedom to try different drivers. The calculated internal volume is 20 liters, just like the original.

Where I need help is the woofer selection. There are so many to choose from it is a bit overwhelming.
Thank you in advance
Dean
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Old 8th January 2019, 12:12 PM   #2
denibeni is online now denibeni  Hungary
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Why not to buy Chinese tweeters?
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Old 8th January 2019, 12:30 PM   #3
drf24 is offline drf24  United States
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Click the image to open in full size.

Last edited by drf24; 8th January 2019 at 12:32 PM. Reason: Bad link
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Old 8th January 2019, 01:10 PM   #4
denibeni is online now denibeni  Hungary
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This is just one example. Nowadays tweeters are delicate devices, i don't think it's worth to buy a cheap chinese clone if sound quality is priority.
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Old 8th January 2019, 01:19 PM   #5
drf24 is offline drf24  United States
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Trying a new link cant seem to get it to work.Click the image to open in full size.
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Old 8th January 2019, 01:21 PM   #6
PeteMcK is offline PeteMcK
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Peerless Nomex woofers
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 8th January 2019, 01:23 PM   #7
drf24 is offline drf24  United States
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Quote:
Originally Posted by PeteMcK View Post
Peerless Nomex woofers
Thanks, I will give them a look.
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Old 8th January 2019, 03:07 PM   #8
manchambo is offline manchambo  United States
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Depending on the shape of those old passive radiators you got, you might also consider the se SB radiators: SB Acoustics SB15SFCR-00 5x8 Passive Radiator
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Old 8th January 2019, 03:29 PM   #9
drf24 is offline drf24  United States
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Quote:
Originally Posted by manchambo View Post
Depending on the shape of those old passive radiators you got, you might also consider the se SB radiators: SB Acoustics SB15SFCR-00 5x8 Passive Radiator
I already have the KEF B139 woofers and the clone Dynaudio tweeters.
I found a set of the B139 woofers in excellent condition.
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Old 8th January 2019, 04:14 PM   #10
raelman is offline raelman  Spain
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Really interested in thie project. I was trying to do it some tiem ago and I left because the big difficult on the wood shape.
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