Infinity KAPPA ONE Kappa Series Class D Mono Subwoofer Amplifier
Best Buy: Infinity Kappa Four 1000W Class D Bridgeable Multichannel Amplifier Kappa Four
These are the specs of my Sub(Infinity Kappa 1000w) paired with xm-gs100 amp, everything set to 4ohm, i find the bass to be lacking and it's all boomy even this feels empty,