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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Do 45's in woofer enclosure help SPL efficiency?
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