20 cm x 20 cm x 25.3 cm = 10,120 cm3 = which is 10.12 Liters ..roughly a 22cm cube
Ok, Designing a conventional enclosure would get us a volume of a less
Looking at this website – http://www.bcae1.com/spboxad2.htm
and plumbing in a few numbers gets us a volume of 6.357 Liters for a ported enclosure
Working backwards, that 6.357 liters gets us dimensions of 15 w x 15 w x 28.5 d (ish), or alternatley a roughly a 19cm cube……a 3cm per side reduction……
So, lets see just how small we could get ‘sensibly’ –
The speaker outside physical diameter is 98.2mm – lets call it 10cm. That’s going to drive the outer dimensions of the speaker…….
The speaker ‘cutout’ is 76.8mm – lets call that 80mm
I’ll use walls of 1.5cm thickness for rigidity (may change this later)
Speaker diameter = 6cm – that’s a surface area of 28cm2
One dimension of our rectangular waveguide is 8cm. lets call that width
8cm width x ? cm Height = 28cm2
28/8 = height =
That gives us waveguide of 8cm x 3.5cm……..
Working with the above gives us the following minimal enclosure dimensions……
Continue reading “Speaker Design…Waveguide, lets start from scratch……”
Blimey, who’d have thought……
Back in the old days, it was as simple as ‘buy a speaker’ , shove it in a box and voila…….
There’s quite a few, including the following types…………
Each has different properties, suited for different things……some are as easy as ‘shove it in a box’, others need complex enclosure geometry and some math………
Now, considering I have 5 speaker drivers waiting to be hooked up, own two 3D printers (and a CNC), Know a bit about Fusion360 and have a penchant for overthinking and overcomplicating stuff (hey, where’s the fun when it’s simple!?)…..I figured, lets learn a little bit about speaker enclosure design……
Turns out, there’s quite a few youtube videos……….
One in particular from a channel that I’d already subscribed to a few months ago…….HexiBase – Can a 3D printed enclosure Get low
Look at the size of that box!……..It uses a Folded Waveguide type resonance chamber for the enclosure…..which appears very similar in design to a ‘Transmission line’ style of speaker.
….Challenge accepted….I’m going to build a small Transmission line speaker!
After months (and months) I’ve finally been able to pull my thumb out and start a long wanted upgrade of my somewhat old Home Theater system…….With a 3D printed ‘twist’
Continue reading “3D Printed Speaker enclosures – another rabbit hole”