Yamaha XM Series Four-Channel Installation Amplifier

The XM series are four-channel amplifiers built for fixed installation racks, where channel count and heat matter more than raw output. Both use Yamaha's EEEngine amplifier topology, which keeps idle draw at 40 W and standby at 5 W, and both cool with a variable-speed fan rather than a fixed one, so a rack in a quiet conference room stays quiet.

The XM4080 delivers 90 W per channel into 8 ohms and 120 W into 4 ohms, or 240 W per pair bridged. The XM4180 roughly doubles that at 210 W into 8 ohms, 250 W into 4 ohms, and 500 W bridged, and adds a 70V line output of 300 W per bridged pair for distributed systems. Each channel takes both an XLR-3-31 and a Euroblock input, drives 5-way binding posts, and offers a switchable 20 Hz or 55 Hz high-pass filter; a D-sub 15-pin control port handles remote monitoring.

Type	4-channel installation power amplifier, EEEngine
Output Power (8 ohms, 1 kHz)	XM4080 90 W x 4 / XM4180 210 W x 4
Output Power (4 ohms, 1 kHz)	XM4080 120 W x 4 / XM4180 250 W x 4
Output Power (8 ohms bridged)	XM4080 240 W x 2 / XM4180 500 W x 2
70V Line Output	XM4180 300 W x 2 bridged into 16 ohms (not available on XM4080)
Frequency Response	+0 dB, -0.5 dB (8 ohms, 20 Hz - 20 kHz)
S/N Ratio	103 dB
Input Sensitivity	+4 dBu, maximum input +22 dBu
I/O Connectors	4x XLR-3-31 and 4x Euroblock in, 4x 5-way binding post out, D-sub 15-pin control
Processing	HPF 20 Hz / 55 Hz / off, 12 dB/oct.