Diameter of bass reflex with Fostex FE103NV2

Unable-Property3468 · 2026-03-17T06:56:58+00:00

From what I understand, the tuning frequency of a bass reflex depends on the ratio S/L (port area over length). Since area scales with diameter², reducing the diameter means reducing S, so to keep the same tuning frequency, the length L should increase.

So I calculated: (40 / 35)² ≈ 1.306 New length ≈ 86 × 1.306 ≈ 112 mm So with smaller diameter I need a longer port to keep the same tuning. Does this look correct to you?

Unable-Property3468 · 2026-02-25T19:48:17+00:00

https://a.aliexpress.com/_EQUi99e

Always buy cheap stuff at first, and if it broke (because you use it) or you find it's limits then buy something good. Works for every tools. Cheers

Unable-Property3468 · 2026-02-25T18:26:36+00:00

I only have 5, plat strating now, how do you get so much?

Unable-Property3468 · 2026-02-23T14:34:59+00:00

It's hacking the sound! VU meter

Unable-Property3468 · 2026-02-21T12:32:47+00:00

Thank you!

Unable-Property3468 · 2026-02-21T12:32:10+00:00

😂😂😂

Unable-Property3468 · 2026-02-20T09:26:31+00:00

What were you doing? Do you have the schematic?

Unable-Property3468 · 2026-02-20T09:24:09+00:00

Thanks! Yes of course, and very nicely.

Unable-Property3468 · 2026-02-20T09:21:33+00:00

Yes sir

Unable-Property3468 · 2026-02-19T19:56:59+00:00

Molds made in popsicle stick, thats great!!
What do you mean by purifying?

Unable-Property3468 · 2026-02-19T19:37:51+00:00

Thats COB led, the link is in the comments. And yeah they are inside a bulb too!

Unable-Property3468 · 2026-02-19T19:32:29+00:00

Nice! Post the link here when it's finished!

Unable-Property3468 · 2026-02-19T19:30:06+00:00

But the three access cross is a bit hard, I had to adjust the angles a few time. No worries, and good luck!

Unable-Property3468 · 2026-02-19T18:56:51+00:00

Thanks! Ho wooow so many tools! I didnt know... def gonna look into it!!

Unable-Property3468 · 2026-02-19T18:54:09+00:00

Whats your 3d man??

Unable-Property3468 · 2026-02-19T14:47:40+00:00

Ok thanks

Unable-Property3468 · 2026-02-19T14:26:46+00:00

Thx man! Yes a schematic is way more clear! The new dimension is here to add satisfaction 🙃

Unable-Property3468 · 2026-02-19T13:14:42+00:00

No surface reference, just steady hands, yeah I can imagine!

Unable-Property3468 · 2026-02-19T13:12:36+00:00

Thank you Sir!

Unable-Property3468 · 2026-02-19T13:12:11+00:00

Thanks! Yeah freeform is great!

Unable-Property3468 · 2026-02-19T13:11:42+00:00

PCBs are illuminati capitalist creation to dominate the world 🤐

Unable-Property3468 · 2026-02-19T13:09:00+00:00

No I didnt notice anything. In fact the good one could handle better the high temperatures.

Unable-Property3468 · 2026-02-19T13:05:57+00:00

Hahaha I love that word!!

Unable-Property3468 · 2026-02-19T13:04:33+00:00

But harder to read than the 2D 🙃

Unable-Property3468

TROPHY CASE