Peapod - A pocket sized mini speaker

Looking at the MaxxBass processor chip, but whether it's practical depends on what it adds to costs and battery life - That said I have see a very budget speaker (£25) that claims to use missing fundamental processing and the IC itself is cheap - about £0.50p in bulk.

Something I noticed from tests so far though is that the quality and linearity of the signal/reproduction plays a large role in the perception of the missing fundamental. The difference after a bit of wadding was added and gentle EQ to one response peak + a high pass was applied was to my ears equivalent to doubling or trebling of the lower bass response (well - this is an exaggeration of course, it's hard to say exactly but it feels a lot fuller and with more weight behind it), even with no processing being used at all. I suppose the more accurate the reproduction, the less likely the brain is able to accept that it's anything less than a full signal so the prompting from harmonic exciters becomes less necessary.

Depending on the listener we all have more or less the ability to tell the difference between a live and a reproduced signal, hence all the discussion among hifi enthusiasts about sound stage, depth, and being able to pinpoint individual instruments and their relative locations to one another. Even if the signal being reproduced is a digital one like an electronic bass line or kick drum, I think those effects holds true (as at some stage it will have been carefully produced and engineered to sound pleasing to the ear - itself an organic device), and the more 'real' or 'live' the sound appears to be the less comfortable the brain would be with significant parts of the signal being absent.

Can I humbly decline? I appreciate being asked but there's way too much on my plate already to have the focus it would require. A lot of people don't appreciate that designing a good speaker is far far more than plotting up a 3D design sketch and run a few simulation programs. That's really only the very early start of the design process. After that comes prototyping to see if there are design changes that needs to be made or you basically have to start from scratch again. Then comes up to several new prototyping steps where you can begin to get an estimate on how the end product will perform and do small redesigns and test out different variations to see which perform the best. It's a fairly long process.

I can naturally have a listen to it and see if I like it or not but I'd not be in a position to give informed feedback on what could be changed.

Nowadays people naturally use DSPs to get a decent end result on even very poor designs but I'm always of the opinion that DSPs should assist in making a good design perform better not make a bad design perform adequately.