TDA2030A amp, Single supply vs+ +/- dual rail

[rwgast_lowlevellogicdesin]

I have a small 25 watt 4ohm sub laying around and a I found a few TDA2030A amp chips I was thinking about using to power it.

After reading the data sheet

http://www.parts-express.com/pedocs/specs/ST-Electronics-TDA2030A-Specifications.pdf

It shows examples of using a split supply and a single positive supply. May I ask what the difference is, what impact would using a single ended positive DC supply have on audio quality over using a +/- split rail?

[mariush]

Split power supply is a bit better because it saves you the trouble of having to use a large capacitor on the speaker output. 

Note that 2030A needs quite high voltage to output decent amount of power, if you want 18-20w - real ones - you need to feed this amplifier chip with about +/-20v or around 36-40v (for single psu). With low voltages like 12-24v, the chip sucks.
The chip is also fairly inefficient at around 65-70% so be prepared to use a large heatsink.

My advice would be to just go buy a TDA2050 (datasheet here: http://diyaudioprojects.com/Chip/DIY-TDA2050-Hi-Fi-Chip-Amplifier/TDA2050-Datasheet.pdf )  if you want to keep it in the same family, or just go for better class D amplifier chips as these don't require heatsinks to work and they'd also work at high power outputs with lower voltages like 12v or 24v

[rwgast_lowlevellogicdesin]

I also have a STK4026 II power amp chip

http://www.datasheets.pl/integrated_circuits/S/STK/STK4026.pdf

Is this a better choice? I thought it was a bit overkill, its huge.....

Im not opposed to ordering a better chip id just like to use something I have on hand. These chips actually came out of a very expensive onkyo receiver I ripped apart and got from a swap meet.

Im only driving a 25 what 4ohm sub, maybe a discrete design with some 2n3055's would be the way to go, but that seems more complicated and I really just want to get the amp part done!