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Multi-Way Conventional loudspeakers with crossovers

Project Small 2-way OB On a Budget - Need advice!
Project Small 2-way OB On a Budget - Need advice!
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Old 6th March 2016, 02:34 PM   #1
cowfoot is offline cowfoot
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Join Date: Jan 2013
Default Project Small 2-way OB On a Budget - Need advice!

Hello diyaudio,

i have been lurking around here for quite some time, but this will be my first post on here.

I have been inspired by all the beautful pictures in the "Ultimate OB gallery" thread and want to build a OB speaker. The thing is that i have limited space and money, so the size and price of the speaker has to be kept down. Im quite new to speaker designing and need some advice and help to reach my goal.

As of now i have done simulations based on the T/S parameters (using BoxSim) utilising the Eminence Delta 12A-2 and the MarkAudio CHR-70.3. The simulation results look like this;

Frequency response:
Project Small 2-way OB On a Budget - Need advice!-fr-graphe-png

I think the frequency response looks good, i know the efficiency isn't skyhigh. Will the impendance peak around 500Hz be a problem?

Off-Axis Frequency Response:
Project Small 2-way OB On a Budget - Need advice!-fr-angles-graph-png

I think that the horizontal off-axis response is acceptable. But the vertical response isn't that nice looking. How important is the vertical off-axis responce? Is the dips in reponse around 700Hz a consequence of the crossover topology? Any ideas to how to fill the dips around 700Hz? Will physical time-alignment of the drivers help regarding the vertical off-axis response?

Crossover Design:
Project Small 2-way OB On a Budget - Need advice!-crossover-png

Attached Images
File Type: png FR graphe.PNG (48.3 KB, 169 views)
File Type: png FR angles graph.PNG (75.4 KB, 169 views)
File Type: png Crossover.PNG (6.6 KB, 97 views)
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Old 6th March 2016, 05:44 PM   #2
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK

Boxsim can't model open baffle loss AFAIK.
The resistors on the bass unit are a very bad idea.
Look at :

rgds, sreten.
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Old 6th March 2016, 06:22 PM   #3
Juhazi is offline Juhazi  Finland
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Join Date: Mar 2007
Location: Jyväskylä, Finland
High fr driver doesn't seem to have any directivity in the plot - There is something basically wrong there. But I believe that this is doable.
Click the image to open in full size.
AINOgradient speaker project
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Old 7th March 2016, 01:15 AM   #4
mikejennens is offline mikejennens  United States
This speaker DIY thing, it's pretty addicting!
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Join Date: Feb 2008
Location: Bismarck, ND
Project Small 2-way OB On a Budget - Need advice!
If you're not set on the drivers you mentioned, you might have a look at this: Fast, fun, Inexpensive OB project - Page 46 - diyAudio

Jolida SJ502A, Squeezebox Touch, Paul Carmody's Sunflowers, Jeff Bagby's Continuums; Planet 10 HiFi's MarkAudio A 7.3 Frugalhorns and MarkAudio CHP-70s, Nola Brio Clones with a Voxel Sub and a bunch of others...
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