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<30l boombox, with more bass than a Halfinator but doesn't need to run as long?
<30l boombox, with more bass than a Halfinator but doesn't need to run as long?
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Old 18th July 2021, 07:42 AM   #11
zerokelvin99 is offline zerokelvin99  United Kingdom
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Join Date: Apr 2010
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I would recommend using a circular rather than triangular ports. Reasons:

1. Circular ports have less aerodynamic losses = more bass
2. Triangular ports present more port noise
3. Easy to tune circular ports with cutting PVC pipe.
4. Ability to add roundover (essential IMO) with a router

More complicated to design, (a few extra bits needed), but well worth the effort in my opinion.

The B&C is a neat little driver. Just watch the maximum excursion!
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Old 18th July 2021, 09:50 PM   #12
weltersys is offline weltersys  United States
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Quote:
Originally Posted by zerokelvin99 View Post
I would recommend using a circular rather than triangular ports. Reasons:

1. Circular ports have less aerodynamic losses = more bass
2. Triangular ports present more port noise
3. Easy to tune circular ports with cutting PVC pipe.
4. Ability to add roundover (essential IMO) with a router
1) Circular ports occupy more cabinet volume for the same Fb, less cabinet volume=less bass.
2) Possibly, but at 115dB+, I've never noticed it.
3) Cutting wood is about as easy as plastic.
4) Rounding wood with a router is no problem.
5) Diagonal ports stiffen the cabinet, and allow a greater frontal area to be used- a larger triangular port may have less port noise.

Other than that, we agree on all points ;^)

Art
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Old 22nd July 2021, 06:53 AM   #13
lost eden is offline lost eden  United Kingdom
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Well I have all the electronics & cabinet hardware now, I'll pick up some wood tomorrow. Looks like it's going to be 18mm ply which seems somewhat overkill/heavy, but it's the only option I can actually get hold of right now.
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Old 22nd July 2021, 09:46 PM   #14
weltersys is offline weltersys  United States
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You could rout triangular shape cavities from the plywood, leaving the corners, front panel and areas where braces are fit full thickness, and reduce the raw cabinet weight to that of 10mm while still being stiffer than the thinner plywood.

Takes some time, but for something you may carry by hand, worth it in the long haul.
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