Features 400 → 450 Watts @ 8Ω 800 → 850 Watts @ 4Ω 1200 → 1300 Watts @ 2Ω Filter capacitance: 132,000 → 198,000 uF Transformer capacity: 1.9 → 2.1 kVA Output transistors: 18 → 24 Sanken 60Mz devices Peak current: 135 → 180 amps Weight: 64 → 83 lbs net Bybee Music Rails™ active high frequency noise filters John Curl driver stage employs a new cascode circuit design FR-408 input circuit board material improves HF signal integrity Gain switch to select 29 dB or 23 dB of gain R-core power transformer for input stage Input circuit board is shielded Double thickness copper on output/power supply circuit boards Gold-plated internal audio signal path connectors Custom CHK Infinium speaker binding posts Looping Neutrik XLR output for easier bi-amping Front panel power indicator LED Updated auto turn on circuits with 3.5mm 12V trigger jacks All Features: Circuitry designed by legendary John Curl Ultra-high bias Class A/AB operation 25 watts of pure Class A power Stable with speaker impedance dips below 1Ω Bybee Music Rails™ - active high frequency filters for input stage New John Curl driver stage employs a cascode circuit for greater open loop bandwidth & superior linearity Gain switch to select 29 dB or 23 dB gain for optimum compatibility with high gain preamps or extremely efficient speakers R-core transformer for input stage suppresses noise on power line 6 massive 33,000 uF Nichicon Gold Tune filter capacitors for output stage 22,400 uF input stage power supply filter capacitors, independent of the main power supply Dual CHK Infinium, custom 5-way speaker binding posts for easy bi-wiring Neutrik locking XLR balanced input & loop output jacks Vampire 24k gold-plated RCA input & loop output jacks Direct-coupled signal path, no capacitors or inductors in the audio path JFET input stage, MOSFET driver stage 24 beta-matched 15 ampere, 230V, 60 MHz bipolar output transistors 2.1 kVA shielded toroid power transformer with premium H18 grade core Independent power supplies for input stage, driver stage & output stage Full power is rated all the way down to 2Hz for unrestricted low-end bass Harris hyper-fast soft-recovery bridge diode rectifiers REL & Nichicon Muse capacitors DC servo & relay protection circuits AC turn-on inrush surge protection with relay bypass Automatic turn-on by 12 V trigger or audio sensing 4 rack space chassis with rear carry handles Rack mount hardware is included Available in silver or black Specs Power Output450 x1 watts @ 8 Ω850 x1 watts @ 4 Ω1300 x1 watts @ 2 Ω Power measurements are with 120 VAC:0.15% THD, RMS continuous power,full audio band (20 Hz - 20 kHz) Class A Power Output25 Watts, bias switch set to high10 Watts, bias switch set to low Current Capacity180 amps, peak Slew Rate > 130 volts per microsecond Frequency Response2 Hz - 120 kHz, +0/-2 dB20 Hz - 20 kHz, +0/-0.25 dB Total Harmonic Distortion (THD)< 0.15 % at full power< 0.02 % at typical listening levels IM Distortion< 0.03 % TIMUnmeasurable Damping Factor> 1200 at 20 Hz Input ImpedanceUnbalanced: 50 kΩBalanced: 100 kΩ, (50 kΩ per leg) S/N Ratio, inputs shorted>122 dB, IHF A-weighted, bias set to Low>120 dB, IHF A-weighted, bias set to High>113 dB, Unweighted, bias set to Low>111 dB, Unweighted, bias set to High Total Gain29 dB (Gain switch set to normal)23 dB (Gain switch set to low) Input Sensitivity for 28.28 V Output into 8 ΩUnbalanced: 1 VBalanced: 1 V per leg(Gain switch set to normal) DC Trigger Requirements+9 Vdc to +12 Vdc, 5 mA Audio Trigger Requirement2.5 mV - 10 mV XLR Pin Identification1 = Ground (Shield)2 = Positive3 = Negative (Return) DimensionsHeight without feet: 7-1/8" (181 mm)Height with feet: 7-3/4" (197 mm)Depth: 20" (508 mm)Depth with cables: 21-1/2" (546 mm) Shipping Carton DimensionsWidth: 29-1/2" (750 mm)Depth: 27-1/2" (700 mm)Height: 15-3/4" (400 mm) Net Weight83 lb. (37.6 kg) Shipping Weight107 lb. (48.5 kg) Power RequirementStandby:
