E.g. this little fella here:
https://www.visaton.de/en/products/drivers/fullrange-systems/bf-37-4-ohmThey have some pages with DIY basics, mentioning: thou shalt not use too small volume, or jumps in diameters etc., but no details or rules of thumb w.r.t. actual sizes.
Basically: what size do I need, and does only volume count, or are there minimum measures in each dimension?
They also have a free to use simulation program that seems to be geared to typical 2-way speakers, alas.
But I want to build an enclosure with exactly one speaker like that (later perhaps another variant with double size, if this test works well, and more scope of application) and some front panel electronics e.g. 5" touchscreen, MCU, audio amp and battery inside, for a special application of mine, for which that single speaker would be optimal and spare me complications, given 1) its specs are accurate and 2) I do ~ get that frequency response with the cabinet I build
I actually need a flat-ish response from 100 to 12000 Hz, thereafter it may fall off as it may.
Edit: as for size I'm
aiming at: I am
not looking for super small. E.g. Rigol DS1000 scope would not be a bad format. Can be bigger if need be.
Material: Wood. (front panel perhaps 6mm plywood, with some glued-on reinforcements vs. unwanted vibrations?)
There are floating around a bunch of cheap-ish 10W class-D amps around (less with 8ohm speaker - maybe just the fit here), stating something like < 0.1% THD, e.g. using the
PAM8160 - now I'm not experienced at all with that. Is that credible when they don't have any LC filter parts in sight, or is that the fine print part (that's usually implicit with cheap modules from China
) ?
There are also
MAX98357 based PCBs with ~3W @ 4Ohm, might be enough, but state a 10% THD. Not nice. I do want this to be in the HIFI realm, except allowing rel. early roll off at 12kHz. Can these be extended with filtering & achieve good results?
The nice thing about the latter is that they have
I2S input, and my
source signal is digital in nature, so adding noise with an extra DAC/ADC and analog line in between is kind of a bummer.
This is for a proto-type (still all hobby realm, and I am not an EE), so I'm looking for modules based approach, not own design.
But if there are some established open source circuits around which I can just copy & be happy & which are superior to these modules, I might look into it, too.
(btw. I know Visaton have a forum, but it seems to take ages to get access there after signing up...)