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update 1: test assembly & first test

A project log for small micro speakers with a rich soundstage

this is a good beginners project for everyone who wants to make small speakers with a 3D printer.

8bit-bunny8bit-bunny 05/18/2017 at 10:370 Comments

So i got the enclosures in, and decided to assemble one speaker (i don't have the passive radiators yet, so i laid the rearside flat on my bed)

luckily everything fitted in the first try, so no reprints needed! (saving costs and filament) :D

Hooked up to a 30W rms at 8 ohm amplifier.

Then i did a measurement from 45-20000hz, and here's the nearfield result:

As one can see, it starts to roll off slowly at 200hz, but it goes as low as 70HZ (without passive radiator!), the high end is very smooth and constant, no slight roll-off at all.

Okay, they're not the loudest (about 86dB @ 1W, 1M), but for a micro monitor they do exactly what's needed: deliver rich sound at a flat response, without too much distortion and staying low cost :)

Distortion is about 15% below 45hz on the 3rd harmonic (did a seperate 20-20000hz test). So i don't recommend them to play low at high volumes (the 4" fullrange speaker goes over it's xmax causing the distortion at those 30watts)

There is a slight peak in the distortion at 1500hz too (2nd harmonic), peaking at about 5.3% (possibly the resonance frequency of enclosure)

Overall the distortion stays at 2% average, which is OK.

Next up is to wait for the passive radiators and connection terminals so i can assemble the rearside of these tiny monsters :)

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