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Multi-Way Conventional loudspeakers with crossovers

2way Speakers with SB Acoustics SB13PFC25-4 & SB26ST-C000-5
2way Speakers with SB Acoustics SB13PFC25-4 & SB26ST-C000-5
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Old 8th April 2019, 07:26 AM   #1
shravanth is offline shravanth  India
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Join Date: Dec 2011
Location: hyderabad
Default 2way Speakers with SB Acoustics SB13PFC25-4 & SB26ST-C000-5

Started the 2way design with SB Acoustics SB13PFC25-4 Paper Cone Woofer and SB26ST-C000-5 Soft Fabric Dome Tweeters

Specs:
2way Floorstanding Speaker from 5'' mid-bass and 26mm dome tweeter.
Cabinet Volume: 8Ltrs
Woofers: SB13PFC25-4
Tweeter: SB26ST-C000-5
Nominal Impedance: 4 ohms
Port tuning Frequency: 45Hz
Cabinet Material: 6mm MDF + 12mm Pinewood
Cabinet External Dimensions: Height - 870mm X Width - 175mm X Depth - 232mm

Xover Design, Cabinet CNC Data, and Measurements will share soon
Attached Images
File Type: jpg 20190408_120837.jpg (748.3 KB, 183 views)
File Type: jpg 20190408_120552.jpg (558.9 KB, 182 views)
File Type: jpg 20190408_120619.jpg (608.5 KB, 180 views)
File Type: jpg 20190408_120700.jpg (475.7 KB, 171 views)

Last edited by shravanth; 8th April 2019 at 07:29 AM.
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Old 8th April 2019, 07:39 AM   #2
googlyone is offline googlyone  Australia
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Join Date: Nov 2006
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2way Speakers with SB Acoustics SB13PFC25-4 & SB26ST-C000-5
Have fun with the project!
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Old 8th April 2019, 08:03 AM   #3
shravanth is offline shravanth  India
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Quote:
Originally Posted by googlyone View Post
Have fun with the project!
Thanks
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Old 8th April 2019, 08:07 AM   #4
shravanth is offline shravanth  India
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Join Date: Dec 2011
Location: hyderabad
Default Drivers

SB13PFC25-4 and SB26ST-C000-5
Attached Images
File Type: jpg 20190408_133358.jpg (218.1 KB, 156 views)
File Type: jpg 20190408_133413.jpg (273.7 KB, 52 views)
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Old 8th April 2019, 05:49 PM   #5
DickHertz is offline DickHertz  United States
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Cabinet looks fine except pine isn't a good choice for cabinet material. Not dense enough. Try Baltic birch or MDF instead.
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Old 9th April 2019, 07:42 AM   #6
shravanth is offline shravanth  India
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Join Date: Dec 2011
Location: hyderabad
Quote:
Originally Posted by DickHertz View Post
Cabinet looks fine except pine isn't a good choice for cabinet material. Not dense enough. Try Baltic birch or MDF instead.
Yes, Pine is not a good choice for Cabinet acoustically so, I have given a try with MDF + Pine sandwich. I used MDF & Teak Wood (Attached Images) in my all builds.
Attached Images
File Type: jpg pearl_a_1024x1024.jpg (60.5 KB, 30 views)
File Type: jpg eight_audio_pearl_grande.jpg (26.9 KB, 30 views)
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Old 9th April 2019, 08:01 AM   #7
rabbitz is offline rabbitz  Australia
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Location: Newcastle, Australia
Nice job and clever use of MDF edges to give a feature.

I can't see an issue with using pine as there is a layer of MDF on the inside plus it's a sandwich construction. Sure, not as good as some alternatives but I have done a similar thing on a baffle of a FAST speaker over a decade ago and compared to the same drivers with more suitable material I can't say I noticed any nasties.

I couldn't see a couple of things in the pics. The woofer needs a 45 chamfer behind the baffle to help with air flow from the driver and easy enough to add with a router and a reversed 45 trimming bit. I don't know if the enclosure has any bracing inside as the panels should not have more than around 350mm without additional support or stiffening.

Easy enough to add with some P2P from side to side or some stiffeners or cleats added. I've shown a couple of examples of what I mean.
Attached Images
File Type: jpg Brace_pine.jpg (120.8 KB, 25 views)
File Type: jpg Brace_chamfer.jpg (68.3 KB, 22 views)
File Type: jpg Brace2.jpg (108.7 KB, 22 views)
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