The GT Series High-Performance Amplifiers are designed for a new generation of sound. These ultra-efficient, super compact amplifiers are designed with Massive Audio’s exclusive "Massive Core" which adds tons of headroom for clean, undistorted, pure sound. The "Massive Core" power supply with oversized toroids and transformers delivers plenty of current to drive even the most demanding woofers and speakers. Top-quality parts and construction ensure years of reliable, trouble-free service. Four-layered circuit boards, with surface-mount computer-assembled parts, are tested as they are placed on the board, to help optimize the signal paths and minimize the need for point-to-point wiring while keeping the board temperature even for more predictable operations. Manuals & Downloads GT / GTR AMPLIFIER MANUAL FEATURES 5 Channel Operation 1 Ohm Stable Class D Digital Design Mil-Spec Multi-Layer PCB with SMD Parts Built-In Noise Reduction Circuitry Full MOSFET with High-Grade / High-Speed Switching Built-In Auto Sensing Turn-On via RCA Inputs 12V Remove Output for External Devices (when Hi-Level is used.) Next-Generation Advanced 5-Way Protection Circuitry World Wide Standard Compliant 4 AWG Recommended Input Clip LED Indicator SPECIFICATIONS 2 Ohm RMS 115w x 4 + 300w x 1 4 Ohm RMS 75w x 4 + 190w x 1 1 Ohm RMS 510w RMS (Subwoofer) Input Level 320mV ~ 7V Freq. Response 10Hz ~ 200Hz (SUB) / 10Hz - 40KHz Low Pass Freq. 80Hz ~ 200Hz Channel Separation 55dB THD at 4 Ohm 0.08% S/N Ratio 91dB Bass Boost -3dB ~ 12dB Minimum Load 1 Ohm (Mono) 2 Ohm (Multi) Gain Remote Included Dimensions 7 (in) x 1.65 (in) x 7.9 (in)