Connecting the speaker out put from a old computer speaker to a 6-inch woofer driver for testing, the results were really surprising. The volume of the music was sufficiently loud, and clarity of voices and instruments was very good, in fact, I was hearing sounds I had never heard before on familiar pieces of music.
After some searching I found that 1-watt or 2-Watt amplifiers could indeed power large speakers, depending on sensitivity. 1 Watt will produce 85 DB sound levels at one meter on average sensitivity speakers, which is quite loud enough. In fact it is not recommended to listen at more than 80 dB levels for long periods of time as it may damage hearing. So this level of sound is quite adequate for listening to music, although loudness compensation will be neeed.
This project is finally completed , and I am very pleased with the sound of the amplifier connected to my open baffle speakers.
For systems intended to play at low volumes (70-80 dB) loudness compensation or bass and treble controls and mandatory, which is something I have missed.
Initially the speaker box was used as the amplifier case.
The TEA 2025 with it new base and backing plate.
An earlier cardboard version
Rear view of cardboard enclosure. Too flimsy for handling
The final version, housed in a cardboard box. Good enough for now.