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To get the best out of your Musical Fidelity FX Power Amplifier, follow these three golden rules:
The FX-A2 took the same chassis but bumped the power supply. It delivers 35 watts per channel into 8 ohms (55 into 4 ohms). This is the "sweet spot" of the series, offering enough grunt for bookshelf speakers like the KEF LS50 or ELAC Debut series. It retains the ultra-high damping factor (over 200) that gives Musical Fidelity amps their characteristic tight, controlled bass.
The FX power amplifier employs a class AB output stage. Unlike the single-ended class A design of the A1, the FX uses a push-pull configuration to achieve higher output power with better efficiency. The circuit is based on discrete transistors (no op-amps in the signal path) and features:
Holding an FX amplifier is a surprisingly pleasant tactile experience. The chassis is a solid, brushed aluminum "brick." There are no flashing LEDs, no Vu-meters, and certainly no vacuum fluorescent displays. musical fidelity fx power amplifier
This "stealth" design allows the FX to be hidden behind a TV console, placed on a bookshelf, or stacked with its companion pre-amplifier (the FX-LPS, for vinyl users).
Some versions include a speaker protection relay. Contacts tarnish over time, leading to low-level distortion or one channel cutting out. Deoxit or relay replacement fixes this.
The FX runs moderately warm, not hot like class A designs. Still, ensure ventilation – do not stack other components directly on top. To get the best out of your Musical
This amplifier is a masterclass in "right-sizing" your system.
Ideal User 1: The Desktop Connoisseur You have a DAC (like a Schiit Modius or Topping E70) that acts as your volume control. You sit 3 feet from speakers like the Vanatoo or Elac Uni-Fi. The FX sits on your desk, driving near-field monitors with zero fan noise and high-end warmth.
Ideal User 2: The Second System Builder You have a big, expensive main rig in the basement. You need something for the bedroom or office. You pair the FX with a Wiim Pro Plus streamer (which has a basic volume control) and some vintage bookshelf speakers. Total cost: under $500. Total enjoyment: Priceless. This "stealth" design allows the FX to be
Ideal User 3: The Vinyl Purist You own the Musical Fidelity FX-LPS phono preamp. You want a direct, signal-path-short chain: Turntable -> FX-LPS -> FX Power Amp -> Speakers. No tone controls, no digital conversion. Just pure analog gain.
The FX delivers 50W into 8Ω and 75W into 4Ω. It is happiest with:
Avoid very inefficient speakers (e.g., 84 dB or lower) or those with large impedance dips below 3Ω – the FX will run out of current and may distort or overheat.