Musical Fidelity FX power amplifier is a rare and highly regarded piece from the brand’s classic
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).
To extract the maximum performance from an FX power amplifier, pair it with a high-quality preamplifier—ideally one with balanced XLR outputs. Matching it with a Musical Fidelity preamplifier ensures a perfect synergy in gain staging and sonic character. However, its transparent nature also makes it an excellent match for tube preamplifiers if you wish to add a touch of classic valve warmth to your system. Speaker Matching
Rated at 600 millivolts , allowing it to pair effectively with a wide range of preamplifiers. musical fidelity fx power amplifier
At the heart of any great power amplifier is its power supply. The FX series utilized massive, custom-designed toroidal transformers. These transformers were paired with high-capacity smoothing capacitors to create an immense power reservoir. This architecture ensured that when a musical piece demanded sudden, explosive transient energy—such as a orchestral crescendo or a sharp drum hit—the amplifier could deliver instantaneous current without clipping or compressing the soundstage. 2. Advanced Circuit Topology
However, the FX is not for everyone. , and owning a vintage component comes with the risk of maintenance issues. Its limited power and high heat output must also be considered. Furthermore, for the same budget as a pristine FX, a buyer could consider a modern entry-level amplifier like the Musical Fidelity M2si , which offers 50 watts per channel, a built-in phono stage, a remote control, and a warranty.
| Parameter | Value | |------------------------|------------------------------------| | Power output (8Ω) | 50 watts per channel (continuous) | | Power output (4Ω) | 75 watts per channel | | Peak current | ~12 amperes | | Frequency response | 10 Hz – 50 kHz (±0.5 dB) | | Total harmonic distortion (THD) | <0.03% (20 Hz–20 kHz, at rated power) | | Signal-to-noise ratio | >95 dB (A-weighted) | | Input sensitivity | 1.0 V for rated output | | Input impedance | 47 kΩ | | Damping factor | >100 (8Ω) | | Slew rate | ~15 V/µs | | Dimensions (WHD) | 440 x 85 x 300 mm | | Weight | ~8 kg (17.6 lbs) | Musical Fidelity FX power amplifier is a rare
Reviewers and hobbyists often describe the sound of the FX amplifier as . Unlike some vintage solid-state designs that can sound clinical or "thin," the FX series is noted for a "nice" tonal balance that avoids intrusive noise or hum. Its ability to maintain power across a wide frequency range makes it a versatile choice for driving various loudspeaker loads, from sensitive bookshelf units to more demanding floor-standers. Build Quality and Maintenance
💡 Pair the FX with a high-quality preamplifier to fully realize its sonic potential. If you'd like, I can help you: Find current listings on eBay or Reverb Compare it to other power amps in its class Suggest a compatible preamp for your setup
Bi-wire compatible terminals that securely accept banana plugs, spade lugs, or bare wire. However, its transparent nature also makes it an
The FX achieves this by employing a completely discrete, symmetrical circuit topology. This means the positive and negative halves of the audio signal are handled by separate, identical pathways, which cancels out distortion and ensures exceptional accuracy. This design philosophy, which focuses on discrete components rather than integrated circuits, is a hallmark of high-end audio engineering and contributes significantly to the amplifier's characteristic richness and detail.
At the heart of the FX power amplifier is a massive, custom-designed toroidal transformer. This heavy-duty power supply ensures that the amplifier never runs out of breath, even when driving demanding, low-impedance loudspeakers. Many models in the FX line feature a dual-mono configuration. By separating the left and right channel power supplies and circuitry, crosstalk is virtually eliminated, resulting in a wider and deeper soundstage. 2. High Current Delivery
The FX power amplifier is designed to integrate seamlessly into high-end stereo or home theater systems, offering versatile input options and rock-solid speaker connections.
Thanks to its high current capabilities, this amplifier pairs beautifully with notoriously difficult-to-drive speakers, including electrostatics, planar magnetics, and multi-driver floorstanders with complex crossover networks. Final Verdict: A Timeless Audiophile Investment
Musical Fidelity FX Power Amplifier: The Ultimate Audiophile Guide
