ADCOM - GFA-555SE - Power Amplifier

ADCOM - GFA-555SE - Power Amplifier The ADCOM GFA-555se is a high-current stereo power amplifier that revives one of ADCOM’s most recognized amplifier platforms with updated internal construction and modern compliance improvements. Based on the classic GFA-555 design, the GFA-555se is built for listeners who want strong output, stable speaker control, and the straightforward reliability that made the original model so respected. The GFA-555se delivers 200 watts per channel into 8 ohms, 300 watts per channel into 4 ohms, and 600 watts in bridged mono operation into 8 ohms. It includes balanced XLR and unbalanced RCA inputs, high-quality gold-plated RCA jacks, gold-plated 5-way binding posts, independent channel power supplies, and 60,000µF of power supply filter capacitance. A custom toroidal transformer helps provide the current reserve needed for demanding loudspeakers and dynamic music playback. ADCOM’s upgraded SE design uses precision-matched devices, fewer gain stages, large independent heatsinks, and independent distortion LEDs for each channel. Its high damping factor, wide power bandwidth, and low distortion performance make it a strong match for full-range speakers, large two-channel systems, and bridged mono applications. The GFA-555se offers classic ADCOM power with modern balanced connectivity and a durable chassis built for long-term system use. FEATURES: High-current stereo power amplifier based on the classic GFA-555 design 200 watts per channel into 8 ohms 300 watts per channel into 4 ohms 600 watts bridged mono into 8 ohms Balanced XLR and unbalanced RCA inputs Custom toroidal transformer supports strong peak current delivery 60,000µF power supply filter capacitance provides reserve capacity Independent power supplies support each amplifier channel Independent distortion LEDs monitor each channel Gold-plated 5-way binding posts support secure speaker connection SPECIFICATIONS: Product Type High-Current Power Amplifier Model GFA-555se Channels 2-Channel Stereo / Bridged Mono Power Output - 8 ohms 200Wpc Continuous, 20Hz-20kHz, Both Channels Driven, <0.04% THD Power Output - 4 ohms 300Wpc Continuous, 20Hz-20kHz, Both Channels Driven, <0.04% THD Power Output - Bridged Mono 600W into 8 ohms, 20Hz-20kHz, <0.09% THD Frequency Response 10Hz-20kHz, +0 / -0.25dB at 1W into 8 ohms Power Bandwidth 10Hz-100kHz, -3dB Dynamic Headroom 2.5dB into 4 ohms, with supplemental cooling Signal-to-Noise Ratio ≥110dB, A-Weighted, 200W into 8 ohms Gain 27dB Input Impedance 10k ohms Balanced, 100k ohms Unbalanced Input Sensitivity 1.75V RMS for 200W into 8 ohms; 130mV RMS for 1W into 8 ohms Damping Factor ≥900, 20Hz-20kHz IM Distortion - 8 ohms ≤0.009%, 1W to 200W IM Distortion - 4 ohms ≤0.009%, 1W to 300W THD + Noise - 200W into 8 ohms 0.004% at 20Hz; 0.003% at 1kHz; 0.006% at 10kHz; 0.010% at 20kHz THD + Noise - 300W into 4 ohms 0.005% at 20Hz; 0.004% at 1kHz; 0.015% at 10kHz; 0.025% at 20kHz Rise Time 2.3µS, 5kHz, 120V Peak-to-Peak Square Wave, 20% to 80% Power Consumption 72VA Quiescent; 1500VA Maximum Power Requirements 120VAC, 50/60Hz; 230V Available by Special Order Chassis Dimensions (H x W x D) 6.9" x 12.1" x 16.9" (176mm x 308mm x 430mm) Maximum Dimensions (H x W x D) 7.5" x 12.5" x 17.0" (191mm x 318mm x 432mm) Weight 36 lbs (16.3kg) Shipping Weight 40 lbs (18.1kg)