How do the product choices differ?

BGW VXi 8.8 Packs up to 16 channels in a single chassis, and does it with power and control never before available in any commercial amplifier. These BGW’s are fully-balanced differential amplifiers (an industry first) and offer unprecedented speed, control and low noise. FTC: Continuous Average Power Rating 20Hz-20kHz @ .05 THD or Less 16x Channels 8Ω - 200 Watts 4Ω - 300 Watts 2Ω - 300 Watts BGW VXi 8.4 This version offers up to 12 channels in a single chassis offering the same performance abilities as the VXi 8.8. However, this unit has an 8 x channel amplifier on one side and a 4 x channel amplifier on the other side, both of them are fully-balanced differential amplifiers. FTC: Continuous Average Power Rating 20Hz-20kHz @ .05 THD or Less 8x Channels 8Ω - 200 Watts 4Ω - 300 Watts 2Ω - 300 Watts 4x Channels 8Ω - 300 Watts 4Ω - 700 Watts 2Ω - 700 Watts BGW VXi 8.2 A 10 channel single chassis machine, which again matches the performance of its larger siblings. However, this unit has an 8 x channel amplifier on one side and a 2 x channel amplifier on the other side, both of them are fully-balanced differential amplifiers. FTC: Continuous Average Power Rating 20Hz-20kHz @ .05 THD or Less 8x Channels 8Ω - 200 Watts 4Ω - 300 Watts 2Ω - 300 Watts 2x Channels 8Ω - 800 Watts 4Ω - 1200 Watts 2Ω - 1600 Watts BGW VXi 4.4 The single chassis, 8 channel version of this family. However, this unit has a two 4x channel fully-balanced differential amplifiers. FTC: Continuous Average Power Rating 20Hz-20kHz @ .05 THD or Less 8x Channels 8Ω - 400 Watts 4Ω - 600 Watts 2Ω - 600 Watts BGW VXi 4.2 The 6 channel option from the family. Same specs as the larger models. However, this unit has a 4 x channel amplifier in one side and a 2 x channel amplifier in the other side, both of them are fully-balanced differential amplifiers. FTC: Continuous Average Power Rating 20Hz-20kHz @ .05 THD or Less 4x Channels 8Ω - 400 Watts 4Ω - 600 Watts 2Ω - 600 Watts 2x Channels 8Ω - 800 Watts 4Ω - 1200 Watts 2Ω - 1600 Watts BGW VXi 2.2 The smallest version from the range offering a 4 channel single chassis option. However, this unit has two 2x channels fully-balanced differential amplifiers. Power Output 4x Channels 8Ω - 800 Watts 4Ω - 1200 Watts 2Ω - 1600 Watts BGW VXi 6.6 Packs up to 12 channels in a single chassis and does it with power and control never before available in any commercial amplifier. Like it stable mates, this unit is a fully-balanced differential amplifiers (an industry first) and offer unprecedented speed, control and low noise. FTC: Continuous Average Power Rating 20Hz-20kHz @ .05 THD or Less 12x Channels 8Ω - 400 Watts 4Ω - 600 Watts 2Ω - 600 Watts