Pre-Owned Emotiva UPA-500 – $300

5-Channel Solid-State Power Amplifier


The Emotiva UPA-500 is a traditional class A/B amplifier design utilizing a single large 350VA toroidal power transformer and large capacitance bank for its power supply. Having a singular larger sized power supply is an advantage that allows the amplifier to deliver more power to any given channel if the output devices can handle it. This, in turn, provides more available headroom, which is critical for effortlessly producing large dynamics and peaks in music and movies. Emotiva claims the UPA-500 has 40,000uF total power supply capacitance and, peering under the hood, you could see their claim is correct with the four 10,000uF, 63V parts connected in parallel. 63V parts provide more than enough margin above the rail voltage needed to hit the 80wpc rating that Emotiva is claiming. The amp module topology is very similar to its bigger XPA series sibling, but in a more compact surface mount form factor. Emotiva also employs a trick circuit that senses the line voltage and automatically switches between 120VAC and 220VAC.

Fully discrete, dual differential, high current, short signal path Class A/B
Number of Channels:
Power Output (rated power; THD < 0.01%):
140 watts / channel (4 ohms; all channels driven)
80 watts / channel (8 ohms; all channels driven)
Rated Power Bandwidth (at rated power; 8 Ohm load):
10 Hz to 20 kHz + /- 0.06 dB
Minimum Recommended Load Impedance (each channel):
4 ohms (which equals one 4 ohm load or two paralleled 8 ohm loads per channel)
Frequency Response:
10 Hz to 70 kHz (+ 0 / – 3 dB)
THD + noise:
< 0.01%
Signal to Noise Ratio (8 Ohm load):
> 96 dB at 1 watt (A-weighted)
> 117 dB at rated power (A-weighted)
Damping Factor (8 Ohm load):
> 500
Speaker Output Connections:
Full-sized 5-way binding posts; one pair per channel x 5
Power Supply:
350 VA toroidal power transformer
40,000 uF of storage capacitance
Input sensitivity (for rated power; 8 Ohm load):
850 mV
29 dB
Input Connections:
Unbalanced (RCA); one per channel
Input Impedance:
47 kOhms