Not audio related, but I finished putting my electric bike back together, with serious upgrades.

It's a Jetson Bolt Pro, which are stupid small and affordable. I got a new hub motor from Aliexpress, that'll do 2000-3500W (stock was like 300W) a controller that can do up to 80 Amps, and I built a battery pack that can do 80 Amps continuous and then some, with a capacity of about 20 AmpHours. Took a while to do all that. I made sure to over-engineer some things for the sake of current handling/heat/ampacity and such.

That said, the safety considerations immediately went out the window when I took it for a spin. Even with things dialed as low as I can get them, this thing accelerates way too hard. Like it needs wheely bars. The compact design of the frame means the seat is almost directly above the rear wheel, and other than the battery pack, there's not much ballast out front, so I have to lean forward and twist the throttle slowly. I've only fallen twice so far.

I'm still trying to dial in all the controller parameters I have access to via the off-the-shelf S866 LCD display, some of which I can't find any info on, and some of which rely on some detailed specs for the motor, that I don't have, 'cause Aliexpress, and I don't want to discect it to find out. I think I may have found some useful, ebike specific software for programming from the manufacturer of the MCU chip in the controller, waiting for approval for their private github type thing.

Anyway, I'm glad to have it back in action for my 1.6 mile commute 'cause it's faster than driving (even without the mods) Here's a pic that mostly doesn't look that interesting:

That bike is so fucking cool

C/NC:

Pull one speaker out of a 2x15 for a fuller sounding "detuned" cab.


Pro - free
Con - possible bullshit google pg.1 version of a proper fronted ported cab built to a certain spec around yr favourite speaker

LBx wrote: Wed Mar 18, 2026 12:10 pm C/NC:

Pull one speaker out of a 2x15 for a fuller sounding "detuned" cab.


Pro - free
Con - possible bullshit google pg.1 version of a proper fronted ported cab built to a certain spec around yr favourite speaker

Port design is a little more complex than just a big hole, but hey, try it out I guess. Maybe it will be cool.

The "detuned" thing is, if I remember correctly, a port that's too big to function as a proper port and aims to get the best of both worlds with closed and open back cab design. Its very much a guitar thing (where most dont care about ports), not a bass thing (where most do).

LBx wrote: C/NC:

Pull one speaker out of a 2x15 for a fuller sounding "detuned" cab.


Pro - free
Con - possible bullshit google pg.1 version of a proper fronted ported cab built to a certain spec around yr favourite speaker

find a speaker with no voice coil and put that in the hole for a passive radiator. I have a set of bookshelf speakers that have such a setup and I use one as a sub for the home system. It gets a lead from right and a lead from left to make it mono and it points into a room corner behind the TV. Works well.

djimbe wrote: Wed Mar 18, 2026 1:24 pm

LBx wrote: C/NC:

Pull one speaker out of a 2x15 for a fuller sounding "detuned" cab.


Pro - free
Con - possible bullshit google pg.1 version of a proper fronted ported cab built to a certain spec around yr favourite speaker

find a speaker with no voice coil and put that in the hole for a passive radiator. I have a set of bookshelf speakers that have such a setup and I use one as a sub for the home system. It gets a lead from right and a lead from left to make it mono and it points into a room corner behind the TV. Works well.

Interesting Idea adding a passive radiator to a guitar cab. they do a specifically weird thing causing a sharp hipass just below their resonant frequency that when designed well can sound really good to extend a small box lower. Focal Shape monitors have them and sound great. Barefoots have them and look like something Apple would sell so they are popular too. As a project it might be cool to make a really small single 10" or 12" cab with a passive radiator to see if it would work well as a little cap sound big cab thing. I think in a giant 2x15" cab with a 15" radiator it would resonate so low that it might get hella muddy but who knows. They also tend to really make your low hang around, extending the time domain down there a bit souit could be a swamp monster. Fun thing to try out.