Are you interested in using it? Contribute your requirements:
- What do you consider ideal/maximum weight?
- What would be the maximum size?
- How do you want to mount it on your bike?
- Are you only interested in a speaker that can be mounted on your carrier above the rear wheel, or would a cart be possible too?
You can add your thoughts below
or anywhere else
Expected issues, or why these requirements are important
- We would ideally need a speaker with high sensitivity = able to play loud with little power
- High sensitivity speakers generally use:
- Compression drivers that need waveguides
- PA drivers that need to be big to play any bass or smaller hifi high-sensitivity drivers that are expensive
- All this is big and/or heavy
- Quite small speakers are possible, but either won't play loud enough, or will be heavy (strong motors and large battery), and will consume more power
- A small Synergy horn with a small fullrange driver for mids and treble and two woofers for bass.
- Although it wouldn't be anywhere near as big as soundsystem Synergy horns, the size would probably still be pushing it for a bike
- It might be heavy due to using two woofers (two are neccessary) and more wood since it's not just a box
- It should be loud enough if designed well (being horn-loaded makes the fullrange driver very sensitive) and sound really good
- I will be trying to design such speaker anyway for home use because I'm fascinated by Synergy horns
- A simpler option: compression tweeter in a waveguide + a woofer.
- probably about 24 cm wide and 40 cm tall with some depth too - this design doesn't work too well with smaller waveguides + woofers
- There are some kits available - although not cheap, this one has very good sensitivity and will sound amazing (in fact, probably a level better than neccessary, which might not be a good thing): http://www.diysoundgroup.com/waveguide-speaker-kits/fusion-8/fusion8-kit.html
- Easier to build, a bit lighter, theoretically easier to design, but I've never done it, so in reality probably not
- Another simple option: a coaxial speaker, compression tweeter inside a larger woofer
- Kits cost about as much as above option
- Probably a bit less bass and loudness, but not much, a bit worse sound-quality, but still better than anything you actually have at home
- Simplest option - a box with two fullrange drivers, ideally 4 inch for the powerhandling and bass
- Very simple to build
- Good fullrange drivers aren't cheap (I'd say at least 35 USD a piece), but can sound very good, especially with equalization
- Lowest sensitivity
- We could try to supplement them with a tiny transmission-line subwoofer, possibly 3D printed, not sure if it would work, otherwise it would probably have the least bass
Other hardware needed
- Amps. D class for effectivity. Could something like this run off a battery? It's so cheap that spending time to design it ourselves would be pointless, there are other similar kits like this on Aliexpres: https://www.aliexpress.com/item/F98-2016-newest-Free-Shipping-New-TDA8920-CLASS-D-Audio-Power-Amplifier-AMP-Module-Kit-100W/32604609497.html
- Other option would be to buy a second-hand car radio on Aukro and rip out the amp, the question is whether it could run directly off a lithium battery. Car batteries are theoretically cool, but heavy.
- DSP. We will need some for the big soundsystem anyway, it should be usable here as well