Re: Amp questions: power amp, power supply, how to convert AC to DC

Posted by rocket88 on Jan 15, 2018; 3:54pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/Amp-questions-power-amp-power-supply-how-to-convert-AC-to-DC-tp41137p41316.html

i meant to this earlier, but forgot. i built the mini model t using one of the TPA based power amps. first thing to keep in mind is the output is determined by the speaker impedance. the TPA3118 power amp is rated at 60watt at 4ohm, and 30watt at 8ohm if i remember correctly. you also need to keep in mind the number and size of the speakers, larger and more speakers means more volume due to the increased air moving.

i used a TPA3116 based power amplifier rated at 100watt at 4ohm and running at 24V. when i run it through my 2x10 ampeg cabinet it has less output compared to when i run it through my mesa boogie 4x10.

now on to answer your questions:
1. i don't believe you can use multiple tiny giant amps to run different speakers unless each speaker has it's own input and you're running the tiny giant amps as individuals. if you want more wattage i think it would be better to find a different premade mono output class d power amp.

2.  to get 12V at 5A you can do it with a power supply that will supply the correct voltage and amperage or you can use a converter stepdown board like this.

3. speakers are more of a personal taste, so i can't tell you what i think you should get. typically guitar speakers don't do well with bass, and bass speakers will have less high end then guitar speakers. i play more doom metal and psych rock so using one of my bass cabinets with guitar works out great, but i plan on making a 4x12 cabinet for guitar wired at 4ohm, but haven't figured out what speakers and figure it's gonna run me around $350 for the speakers alone.