Amplifiers the Heat Behind the music. Amplifiers produce the power you want and need to make your music loud

There are many brands of amplifiers and many models 

For Example- Visonik, Sony, Blaupunkt, Mtx, Jbl, Ect..

First thing you need to figure out is. Is this an Amplifier for a Subwoofer or for Normal Component Speakers,

Class A/B is for Component Systems

Class D is for Subwoofers.

Both Classes  will work with either Kind of Speaker, As Many Amplifiers can Be used With Subwoofers  Its just that Class D is Designed To Make Lots of Power Very Quickly and able to hold it there For Ground pounding Sound

Second is How much Power do you really need, 

After those two decisions you can decide on the brand, Price, and features you need.

Visonik V3909  A Class A/B Amplifier