Luke

@AudioSimon @Polymate3D I’ve thought of it, but I’m not convinced gyroid is all that stiff. There might be room for an audio-specific cavity infill as a slicer plug-in. Anyone?

1 day, 8 hour 3D print. ~900g of filament. The 1st cabinet build for the latest driver to be finished! 21 x 16 x 21.7cm (HxWxD) What do you think?

@Polymate3D I think 6-10mm is pretty good, for that size of enclosure. From my experiments, direct cross braces between opposite walls is the most mass-effective way of reducing panel resonances.

@zx82net 3 perimeters @ 0.5mm so 1.5mm for the solid wall on the inside and outside. Gap between with infill varies from 4mm to 7mm. So in total is varies from 6mm to 10mm. I'm not expecting it to match wood based due to low mass, but will it be acceptable? Time will tell!

@Polymate3D Looking really smart! Great work, Paul.

Fidelity 7 with its custom front fascia for this cabinet. Nice smooth transition from driver to cabinet

@Polymate3D Very nice finish

Smooth! New filaments arrived so printing some test cones. More guide work tonight hopefully

@Polymate3D Did you experiment with different angles between the whizzer and the main cone?

Whizzers done. Should I do a resin printed dome?

@Polymate3D That kind of under extrusion might just be beneficial in this case 😀

Print quality sucks due to extruder. Got a metal replacement coming which will be used until I switch to direct drive. Design work already underway

Dome off Whizzer on Test test test

@BambulabGlobal It would be cool to have a way to make it cycle a sequence of colors automatically, to create stripy patterns.

@zx82net First add more filament choices in the slicer by clicking on the "+" sign, then slice. In the slicing screen, scroll the layer bar on the right, right-click on "+" when you reach the desired layer height, and click on change filament :)

@BambulabGlobal How would I make BambuStudio slicer swap filament color regularly after a fixed number of layers? e.g. 10 layers from spool 1, 10 layers from spool 2, 10 layers from spool 1, ...etc.

@Polymate3D Looks like a great test bed for different materials

4 cones voice coils done, ready for testing. Using prototype 9 as a test platform. No gluing in or domes as checking against each other for top end performance. This is also all PLA variants. Then we will expand to other materials. Poll below 👇

@AudioSimon LOL my thoughts exactly when he took that side panel off. I guess Kenwood were just desperate to get in on Bose’s “wave” technology.

@AudioSimon @toms3dp I’m trying to understand the function in this acoustic setup. FR looks like a low-pass?

@AudioSimon @ErinsAudio @seanolive This is the broadband output for a swept input? Theory: acoustic output is highest at box tuning frequency: turbulence. Accelerometer is highest at pipe resonance, where pressure differential between middle and end of the port is highest?

@Polymate3D Very impressive progress. Are the differences between the carbon fiber and poly wood easily audible?

Post to go up on Patreon later. Here is some distortion measurements of my 2 Tenacious 7 Prototypes(1 CF PETG, 1 Polywood) against the Mark Audio Alpair 7.2(£100/pr) & Pluvia 7(£90/pr) This volume is my typically daily listening volume for context. How did I do!? 😎🔈🔉🔊

@Polymate3D That looks super clean!

1st CF PETG cone for Tenacious 7 Gen 3 is here. Shows up the actual cone shape much better🔈🔉🔊

@adrianbowyer @RandyMongenel @livingarchitect It’s seems like a plasma torch can be up to 90% efficient. Fair to assume the vast majority of the energy is going into making hot rock. The question is how do you get the rock away fast enough to avoid melting the drilling rig? en.m.wikipedia.org/wiki/Plasma_to…

Earthgrid aims to re-wire the USA using super-cheap tunnel tech newatlas.com/energy/earthgr…

@Mobile_Dom @toms3dp @FilamentFrenzy @CNC_Kitchen @joeltelling Can anyone explain why being too hot cause this effect?

@toms3dp @FilamentFrenzy @CNC_Kitchen @joeltelling PLA dried at 50c for 12 ohurs, hot was definitely the culprit, dropped it down from 225 to 195 and no issues

3DP friends do you have any idea what's causing this? On the long smooth surfaces with no breaks it's fine, but when the cavities are there it has an underextruded look to it @toms3dp @FilamentFrenzy @CNC_Kitchen @joeltelling et al

@EvanKirstel Trick question, it’s zero in both cases. If you just let go of either of them they’ll drop.

1 or 2? #Engineering

@Polymate3D Starting to look like a little monster! Do you know the cause of the roll off above 5kHz?

Here is the response of Micro (Teal), Micro+ (White) & Logitech LS11(Orange). As you can see, Micro+ gets rid of the bass bump Micro has, and extends even lower. Logitech LS11 bass wise is miles off, dropping off @ 175Hz Vs Micro @ 120Hz & Micro+ @ 85Hz

@adrianbowyer Live or cooked?