Mounting the one transistor amplifier on the speaker baffle panel

At your risk. All safety precautions should be followed for any voltage or current. A fuse in series with battery is very important too.


If a baffle mounting is possibly the best way to mount a speaker:
Efficient
No boxiness nastiness
Deep bass, only 6db per octave drop below cutoff frequency.


And if a one transistor amplifier is possibly the best way to amplify music:
Class A (electrons flowing all the time) resolution
No feedback error iteration
Loud at peaks
Very simple signal path, minimum components, low order harmonic distortion


Then how could these be combined together?


For example:


A frame (or careful ceiling hanging etc)  supporting a baffle which can be of thin wood, linoleum etc.
A drive speaker fullrange unit preferably of (50-70)?Ω mounted of centre
A BD139 transistor, bias resistor, battery holder, fuse, volume potentiometer mounted on baffle used as chassis.
Efficient
Relatively easy
Transparent, all simple signal path readily seen.
Magnificently natural sound?



This could be the Pleiades active speaker.