GL-E27
7 band graphic equalizer / Slim size (1/2 DIN) / Subwoofer crossover control / Fader control / 2-channel LED output level indicator / High/low level input / Soft start and muting / Automatic power switch

GL-E37
7 band graphic equalizer / Hi-power 25WX4 output / Slim size (1/2 DIN) / Subwoofer crossover control / Fader control / 2-channel LED output level indicator / High/low level input / Soft start and muting / Automatic power switch

GL-E37B
7 band graphic equalizer / Hi-power 25WX2 output / Slim size (1/2 DIN) / Subwoofer crossover control / Balance control / 2-channel LED output level indicator / High/low level input / Soft start and muting / Automatic power switch