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Power Amplifiers

From the legendary zero-feedback SM-70 Pro to the high-power SE series ??every Monarchy amplifier is handcrafted in San Francisco to deliver pure, musical power.

SM-70 MK2 Power Amplifier
SM-70 MK2 Front SM-70 MK2 Interior SM-70 MK2 View 3

SM-70 MK2

MOSFET Power Amplifier

The original SM-70 MK2 is the foundation of Monarchy's acclaimed MOSFET amplifier lineage. Available in both 120V and 240V mains versions, this proven design uses a robust U-channel chassis and time-tested IC-based topology that set the standard for high-value amplification. Read Reviews →

Key Features

  • MOSFET output stage with precision bias adjustment
  • Available in 120V and 240V mains versions
  • Rugged U-channel chassis design
  • DC offset target <10mV at speaker terminals
  • High-frequency stability coils near speaker terminals
  • Transformer mounted with vibration-damping rubber pads
  • Thermal interface on rectifier mounting for optimal heat dissipation
SM-70 Pro Front
SM-70 Pro Front SM-70 Pro View 2 SM-70 Pro View 3 SM-70 Pro View 4

SM-70 Pro

MOSFET Power Amplifier

The SM-70 Pro represents the pinnacle of Monarchy Audio's zero-feedback amplifier design. Built around matched pairs of N-channel 2SK2221 and P-channel 2SJ352 MOSFETs, it delivers 80 watts per channel of pure, uncolored power with exceptional imaging and a vast, three-dimensional soundstage.

Key Features

  • Zero negative feedback design for natural, uncolored sound
  • Parallel MOSFET output stage ??2SK2221 & 2SJ352
  • 80W per channel into 8 ohms
  • Both balanced XLR and single-ended RCA inputs
  • Five operating modes: Stereo, Bi-Amp, RCA Mono, XLR Mono, Multi-Unit Bi-Amp
  • Signal-to-noise ratio up to 100dB
  • Fuse-protected voltage rails on both positive and negative supplies
  • Handcrafted in San Francisco, USA

Operating Modes

  1. Stereo: RCA input drives both channels A and B
  2. Bi-Amp: One unit dedicated to a single speaker with bi-wiring
  3. Mono Bridged (RCA): RCA input, switch set to mono for bridged output
  4. Mono Bridged (XLR): Balanced XLR input with true balanced bridged output
  5. Multi-Unit Bi-Amp (XLR): Up to 4 units cascaded via XLR wiring
SE-100 MK2 Power Amplifier
SE-100 MK2 Front SE-100 MK2 View 2 SE-100 MK2 View 3 SE-100 MK2 View 4

SE-100 MK2

MOSFET Power Amplifier — 100W/Ch

The SE-100 MK2 delivers 100 watts per channel from its high-voltage 100V rail design. Featuring a sophisticated daughter board output stage with 2N5550 transistors and relay circuit, it offers authoritative power delivery with finesse.

Key Features

  • 100W per channel into 8 ohms
  • 100V internal rail voltage for high headroom
  • MOSFET output stage on removable daughter board
  • 2N5550 transistor-based relay circuit
  • Bias adjustable to 1.6V between test points (~1.55V after warm-up)
  • Large filter capacitor bank (4 big caps)
  • Front panel: 27.7cm wide ? 10cm tall
  • XLR socket, heavy-duty speaker terminals, AC socket, fuse holder

Important: The SE-100 MK2 has no output protection circuit. Speaker outputs must never be shorted ??doing so will destroy all internal devices.

SE-160 Power Amplifier
SE-160 Front SE-160 Rear

SE-160

MOSFET Power Amplifier — 160W/Ch

The SE-160 brings 160 watts per channel of MOSFET muscle. Part of the SE series, it bridges the gap between the refined SE-100 and the formidable SE-250, offering substantial power reserves for demanding speakers and larger listening spaces.

Key Features

  • 160W per channel into 8 ohms
  • MOSFET output stage for warm, tube-like tonality
  • Part of the acclaimed SE amplifier series
  • Robust power supply for dynamic headroom
  • Designed for medium to large listening rooms
SE-250 Power Amplifier
SE-250 View 1 SE-250 View 2

SE-250

MOSFET Power Amplifier — 250W/Ch

The SE-250 is the most powerful amplifier in the Monarchy Audio lineup, delivering a commanding 250 watts per channel. Designed for the most demanding speaker loads and largest listening environments, the SE-250 combines brute power with the musical refinement that defines the SE series.

Key Features

  • 250W per channel into 8 ohms — Monarchy's highest power amplifier
  • MOSFET output stage for refined, musical power delivery
  • Massive power supply for uncompromised dynamic range
  • Engineered for large rooms and demanding speaker loads
  • Flagship of the SE amplifier series

Amplifier Comparison

Model Power/Ch Topology Inputs Highlights
SM-70 MK2 70W MOSFET, IC-based RCA + XLR 120/240V versions, proven design
SM-70 Pro 80W MOSFET, Zero Feedback RCA + XLR 5 operating modes, S/N 100dB
SE-100 MK2 100W MOSFET, 100V rails RCA + XLR Daughter board, large cap bank
SE-160 160W MOSFET RCA High power, tube-like tonality
SE-250 250W MOSFET RCA Highest power, large rooms

Experience the Sound

Contact us to learn more about our products or to place an order. We ship worldwide.

+1 650.873.3055
380 Swift Ave., #21 South
San Francisco, CA 94080, USA