Hello, I have an Amp powered by a 5s 18650 battery pack (so voltage is between 21 and 14ish) connected to two nd 90 8ohm speakers(20w rms). The Amp is supposedly able to output 50w at 4ohms(I doubt it since it's propably a tpa3116 chip so around 30watt at 24v max). Should I bother to interpose this DC boost converter between the Amp and the batteries? I am not sure if it will make a difference with this speakers. I can hear the speakers clipping at full volume when the batteries are almost discharged but apart from this I doubt it will increase the output of the speakers and it will also lower the battery life because of the not perfect efficiency.
In general, leave as is, it works well enough and as you guess, trying to keep voltage steady at its highest level shortens battery life big time, energy is not created.
That is justified in some niche applications, such as a small (but feature packed) Roland Guitar Amplifier, fed from 6 AA batteries or similar, but they are already starting with a very low voltage.
Then it performs well until it abruptly dies, and squeezes down to the last watt-second of energy from them.
JBL Boombox also starts with a 7.2V battery and boosts it to 12 or 16V as needed
But as described, your application is quite usable.
Worst case lower volume somewhat when approaching end of battery charge.
That is justified in some niche applications, such as a small (but feature packed) Roland Guitar Amplifier, fed from 6 AA batteries or similar, but they are already starting with a very low voltage.
Then it performs well until it abruptly dies, and squeezes down to the last watt-second of energy from them.
JBL Boombox also starts with a 7.2V battery and boosts it to 12 or 16V as needed
But as described, your application is quite usable.
Worst case lower volume somewhat when approaching end of battery charge.
