Desert Eagle DE-S900.4 900 Watts Max, 450 Watts RMS 4-Channel Multichannel Amplifier RELIABLE TECHNOLOGY: Extruded Aluminum Chassis. Black and Sanding Heat sink. MOSFET PSU Transistors. Fuller Regular PMW Power Supply. Hi/Low/Pass Crossovers. 200MV-5V Low level Inputs. Direct 4GA power Terminals. 8GA Speaker Terminals AMAZING POWER HANDLING: 2-Ohm Stable in Stereo Mode. 4-Ohm Bridged Stable Class A/B. RMS @ 4-Ohms: 4 x 120 Watts. RMS @ 2-Ohms: 4 x 240 Watts. RMS @ 4-Ohms Bridged: 2 x 450 Watts. ADAPTABLE PERFORMANCE: Crossover and switching: Variable Hi Pass: 120 Hz - 3 KHz. Variable Low Pass: 50 Hz - 250 Hz. Bass Boost: 0-6-12 dB at 45Hz. THD% &lt;0.05%. Signal-to-noise Ratio: &gt; 104 db. 10 Hz - 60Khz Frequency Response. Variable Input Level Control FOUR WAY PROTECTION CIRCUIT: Thermal protection, over-load current protection, output direct current protection, speaker short-circuit protection DIMENSIONS (Lx W x H) Inches: 10" x 8.7" x 1.9". DIMENSIONS (Lx W x H) MM: 255 x 220 x 48