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Old 24th January 2011, 01:20 PM   #41
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Hi Brian,

Can you provide a diagram of your cab?
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Old 24th January 2011, 01:50 PM   #42
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Quote:
Originally Posted by ontariomaximus View Post
Hi Brian,

Can you provide a diagram of your cab?
There's a link to it further up in this thread.
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Old 3rd December 2012, 07:09 PM   #43
maxo is offline maxo  United States
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Location: A Hole in Texas
Brian,
what was the final graphs on your sub build
what would be the maximum voltage and what HP and LP filter settings to protect the driver
also do you make 4 or so for the bar you say you will put those in
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Old 4th December 2012, 12:17 AM   #44
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Quote:
Originally Posted by maxo View Post
Brian,
what was the final graphs on your sub build
what would be the maximum voltage and what HP and LP filter settings to protect the driver
also do you make 4 or so for the bar you say you will put those in
The final graph is available on the POC #2 page - see The Subwoofer DIY Page v1.1 - Projects : "Proof of Concept #2".

I wouldn't recommend this as a build unless you do a few mods, as I put it together to try out a few concepts and not as a "production" build. Bracing was initially left out on purpose, for example. Its performance suggests that even the bracing I subsequently added is not totally adequate, particularly before the first fold, and better results might be obtained by rear-mounting the driver and permanently fastening the top panel to the internal panel by a suitable bracing arrangement to cut down distortion-producing vibration at that location. The FR also suggests that a slightly larger mouth may produce better results. And with the DFD in place this is basically a 39 Hz tuned box with a 12" driver - not something you'd typically find in pro audio use. The THAM fold is a bit limiting too - for maximum path length, the box ends up having a square profile. Have a look at the Thorn F1 thread for an interesting "mod" that allows for greater path length and a box with a taller profile (more suitable for sitting tops on).

As for power handling, the POC#2 has done ok when paired with my 1200W car amp (effectively feeding up to 600W RMS into its 8 ohm impedance). If I have some time this week, I'll run some power sweeps with it fed by the amp to see what the distortion looks like at various voltages, to get an idea of what the peak voltage capability should be. Naturally it should be highpassed below Fb if running a lot of power into it (mostly because it will sound like crap if trying to produce frequencies below Fb).
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