I started building a DIY portbale speaker out of a douk audio tp 3116 and an old pair of sony speakers.
The spec on the ebay site of the amp says that it operates between 12-25 volts, but for the 60 watts sony speakers I would need around 24 volts. So my question is how should I power the amp? I wanted to use 2 gel batteries, but if fully charged it would output around 28v, so i would need a dc-dc converter, and its capacity is small as well, so i thrashed this idea. If I used 18650-s I would need 5-6 cells, (I realised that 20v is enough for what I want it to use) but i dont know how long will it last with this kind of setup. Should I use 2-3 packs in paralell in order to get decent batterylife or it is hopeless to make something this "powerful" battery powered.
Could you tell me what should I do in order to make this project work?