Model number: F-series High Performance Power Amplifier Sell - F-series High Performance Power Amplifier  F600-amplifier-2X462W@4 ohms(2U)  F800-amplifier-2X625W@4 ohms(2U)  F1000-amplifier-2X748W@4 ohms(2U)  F2500-amplifier-2X1225W@4 ohms(3U)  F3500-amplifier-2X1600W@4 ohms(3U)  Specification:  F-Series power amplifiers are designed to live sound reinforcement, touring systems or fixed installation. As toroidal power transformer power amplifiers, they are top standard quality in current market. They are the ideal choice when high headroom and low distortion are needed, especially when reproducing the dynamic range and clarity of today digital recordings.  Key Feature:  * 2/3U high, heavy duty steel chassis  * Modular construction for easy servicing  * Symmetrical layout for even weight distribution  * High efficiency toroidal power transformer  * Oversized, high energy, linear power supply  * 3 steps, Class H Audio topol  *Stereo, parallel or bridged operation  * Twin balanced inputs (Neutrik XLR connectors)  * Dual Speakon and Binding posts outputs  * High quality components used throughout  * Dual, continuously variable speed fans  * Efficient two sides cooling, the efficiency is better than back to front cooling  * Active, signal, protect and critical indicators  * Duraluminium, 8mm thick front-panel  * Unobtrusive carrying handles  * Voltage Gain: 35 or 40 dB