Усилители мощности моно — Emotiva XPA HC-1

The XPA HC-1 is a high current monoblock power amplifier in the X Series from Emotiva. Each chassis carries a single XPA Gen3 amplifier module powered by a separate switch mode supply of its own, so one unit drives one loudspeaker and a stereo system needs two. Emotiva designs and assembles it in Franklin, Tennessee, lists it at USD 1,099 per unit and builds it to order within one to three business days.

Key specs that matter

Rated output is 300 W RMS into 8 ohms at under 0.1 percent THD and 600 W RMS into 4 ohms at under 0.2 percent, both across 20 Hz to 20 kHz. Broad band response covers 5 Hz to 80 kHz within plus 0 and minus 2 dB. Distortion plus noise stays below 0.015 percent at 100 W into 8 ohms at 1 kHz, noise sits more than 120 dB below rated power and the damping factor exceeds 500. Input sensitivity is 1.71 V for rated power into 8 ohms, gain is 29 dB, and input impedance is 33 kOhms balanced or 23.5 kOhms unbalanced. Power bandwidth at rated output into 4 to 8 ohm loads is 20 Hz to 20 kHz within 0.1 dB, and minimum recommended load is 4 ohms. The unit measures about 213 mm wide, 194 mm tall and 483 mm deep, and it weighs about 9.8 kg unboxed or 12.7 kg in its carton.

Engineering and use context

The amplifier circuit uses a fully discrete, dual differential Class A/B layout with a short signal path, combined with the Optimized Class H power supply topology and a high efficiency switch mode supply. Giving each channel its own chassis and supply reduces crosstalk compared with a multichannel design. XLR and RCA sockets are selected independently, and gold plated 5-way binding posts accept the loudspeaker leads. A microprocessor watches for overheating, short circuits and other common faults, and a resettable circuit breaker at the back deals with AC line faults. The standby halo and status LED at the front can be dimmed or turned off completely. The mains input accepts 100 to 250 V at 50 or 60 Hz with automatic detection, and Emotiva backs it with a five year warranty.

Pairing

The chassis shares the height and depth of other XPA Gen3 models at half their width, so a pair sits next to each other on one rack shelf, or each can be placed close to its speaker. A preamplifier offering balanced connections can feed the XLR inputs over longer cable runs, and the low minimum load suits speakers that need a lot of current.

Alternatives

The Emotiva XPA-1 Gen3 is another monoblock power amplifier from the same maker.