Do 45's in woofer enclosure help SPL efficiency? - Car Audio Classifieds!
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Old 05-11-2016, 09:08 PM
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Default Do 45's in woofer enclosure help SPL efficiency?

More of a thread to start the conversation - and compare hard data.

I recently built a (musically tuned) woofer enclosure for a single 12" woofer, and wanted to do a before-and-after comparison to try to see if all the extra work (and wood) was quantifiably worthwhile.

I do enjoy seeing the craftsmanship some builders are putting into their boxes - but can someone (or many people) step forward and share some data that shows it actually improves spl efficiency?

My mods were not anything extreme - just a few small 45 degree angles - one added to the 90 degree bend in the slot port, one added in the corner opposite the woofer, and one opposite the port opening.

The data gathered (utilizing a Termlab Magnum) was over a 5hz range where optimal efficiency was found at a modest power level.

Original box:
41hz - 141.5db - 587 watts (7.41 ohms)
42hz - 141.9db - 561 watts (7.72 ohms)
43hz - 142.2db - 568 watts (7.11 ohms)
44hz - 142.3db - 595 watts (6.24 ohms)
45hz - 142.1db - 689 watts (5.41 ohms)

After adding the 45 degree angles
41hz - 141.7db - 668 watts (7.07 ohms)
42hz - 142.0db - 637 watts (7.40 ohms)
43hz - 142.3db - 633 watts (7.06 ohms)
44hz - 142.5db - 663 watts (6.15 ohms)
45hz - 142.5db - 757 watts (5.34 ohms)

From this testing, it would appear SPL has increased very slightly - but so has power (lower impedances). Efficiency appears to have actually dropped in relation of power to SPL...

Thoughts? Data?
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  #2  
Old 05-11-2016, 09:35 PM
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What where the specs of the size and tuning of the box?
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Old 05-11-2016, 09:55 PM
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It could be just the decreases in box volume that the angles displace too.
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Old 05-11-2016, 09:57 PM
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Not to mention the 45 at the port could of changed the area at the end slightly.
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Old 05-11-2016, 10:01 PM
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Not all boxes benefit from 45s I have tested with and without some gain some flop.
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Old 05-11-2016, 10:42 PM
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I want to know why the tests were done with 41-45hz and not 20-40hz

More air is moved the lower you go (as I'm sure you're aware) so wouldn't these results be a little more useful than up high like that?
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Old 05-11-2016, 11:01 PM
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All depends on what your going for. His vehicle might have a resonate frequency around that range. Not to many people use 20hz for spl
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Old 05-11-2016, 11:04 PM
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Crank the volume on 43hz up and let her rip! Lol
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Old 05-11-2016, 11:06 PM
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Lol Nate I didn't even realize it was you.
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Old 05-11-2016, 11:10 PM
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Just a idea you could build a slightly bigger box just enough to compensate for angle displacement to see if it is the 45s vs the smaller box. You probably already did this though.
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