The newly updated A52+ maintains the award-winning performance of its predecessor, while offering an incredible 44% increase in power. According to Home Theater Review, the original A52 was praised as a "truly musically engaging amplifier with an alter ego that likes to blow stuff up." And now, with even more power at its disposal, the A52+ can deliver even more dynamic and explosive sound while retaining its graceful and captivating musicality. Key Features: 180 watts RMS x 5 @ 8 Ω 255 watts RMS x 5 @ 4 Ω 225 watts RMS x 2 @ 8 Ω 350 watts RMS x 2 @ 4 Ω Class A/AB circuitry designed by legendary John Curl Direct coupled - no capacitors or inductors in audio path ensures the cleanest signal Balanced XLR inputs with discrete circuits Full power is rated all the way down to 5Hz for unrestricted low-end bass Custom 1.5 kVA encapsulated toroid power transformer with independent secondary windings for each channel Hand-matched JFETs for input stage Hand-matched MOSFETs for driver stage Beta-matched 15 amp, 60 MHz bipolar output transistors (3 pairs per channel) 100,000 µF power supply filter capacitance DC Servo and relay protection circuits Auto turn on by audio signal or 12V trigger Heavy-duty 24k gold-plated, 5-way speaker terminals 3U chassis with updated cosmetics, rack mountable with HRA3 (sold separately)