Description
About the Musical Fidelity M3si Integrated Amplifier
The Musical Fidelity M3si Integrated Amplifier includes 4 line-level RCA inputs, an MM phono input, asynchronous USB-B input up to 24-bit / 96kHz, and preamp output, giving it useful flexibility for vinyl, digital audio, and future system upgrades.
Musical Fidelity describes the M3si as effortless, clear, and sweet, with wide and deep imaging plus enough power for excellent dynamic range. It is a strong option for customers who want a proper two-channel amplifier without paying for features they may not need.
What We Think
At Rapallo, the Musical Fidelity M3si is a very easy amplifier to recommend for customers building a serious but sensible stereo system.
The appeal is simple. It has real current capability, clean Class A/B-style Musical Fidelity amplifier character, a proper MM phono input for turntables, and a USB input for computer audio. Therefore, it works well as the centre of a vinyl and digital hi-fi system without becoming complicated.
We also like the way Musical Fidelity has focused on core performance. The M3si uses low-distortion power amplifier circuitry, a low-noise preamplifier stage, and careful internal layout to reduce interaction between circuit sections. As a result, it is built around sound quality rather than unnecessary gimmicks.
The MM phono stage is especially useful. It gives vinyl customers a direct turntable connection without needing a separate phono preamp straight away. Also, because it has preamp outputs, the M3si can be expanded later with a power amplifier, subwoofer, or other system upgrades.
For NZ customers, the M3si is a strong match with quality passive speakers from brands such as ELAC, Triangle, Paradigm, SVS, Focal, and Klipsch Heritage. It has enough power for many real-world rooms, while still keeping the system clean, reliable, and easy to use.
View Product Brochure >> View Owners Manual >> View Musical Fidelity >>
The Musical Fidelity M3si Integrated Amplifier is ideal for
- Two-channel stereo hi-fi systems
- Vinyl listeners using MM cartridges
- Customers wanting a proper integrated amplifier with useful inputs
- Bookshelf and floorstanding speaker systems
- Streamer, DAC, CD player, and turntable setups
- Listeners wanting Musical Fidelity power and refinement without moving to the M5si or M6si
Frequently Asked Questions
- What is the Musical Fidelity M3si?
The Musical Fidelity M3si is an integrated stereo amplifier with 85 watts per channel, MM phono input, four line-level RCA inputs, USB-B digital input, and preamp output. - How much power does the M3si produce?
The M3si produces 85 watts per channel into 8 ohms. This is enough for a wide range of suitable bookshelf and floorstanding speakers. - Does the Musical Fidelity M3si have a phono input?
Yes, it has a built-in moving-magnet phono input. This allows you to connect many turntables with MM cartridges directly to the amplifier. - Can I use a moving-coil cartridge with the M3si?
The built-in phono input is designed for MM cartridges and high-output MC cartridges that provide enough output. For low-output moving-coil cartridges, use a separate MC phono stage into one of the line inputs. - Does the M3si have a USB input?
Yes, it has a USB Type-B input that supports asynchronous digital audio up to 24-bit / 96kHz. This is useful for connecting a computer audio source. - Does the M3si have Bluetooth or streaming built in?
No, the M3si does not include built-in Bluetooth or network streaming. For streaming, connect a separate streamer or DAC to one of the line inputs, or use the USB input with a computer. - Can I add a subwoofer to the M3si?
Yes, depending on the subwoofer. The preamp output can be used for suitable subwoofer or power amplifier connections. - What speakers match well with the M3si?
The M3si works well with many suitable passive speakers. Good options include ELAC, Triangle, Paradigm, SVS, Focal, and Klipsch Heritage models, depending on room size and listening taste. - How is the M3si different from the M2si?
The M3si adds more flexibility than the M2si, including an MM phono input and USB-B digital input. It is better suited to customers who want vinyl and computer audio support in one integrated amplifier. - Who is the Musical Fidelity M3si best suited to?
It is best for listeners who want a powerful, clean, and flexible integrated amplifier for a serious stereo system with turntable, digital, and analogue sources.
Key Features
- 85WPC
- Excellent technical performance
- Preamp output
- Unconditional stability, will drive any loudspeaker
- Wide range of useful inputs
- including asynchronous USB and MM phono
- Excellent build quality and convenient size
85W Per Channel Power Output
The M3si delivers 85 watts per channel into 8 ohms. This gives it enough drive for a wide range of appropriate loudspeakers, from quality standmounts to many floorstanding models.
Low-Distortion Amplifier Design
Musical Fidelity specifies THD plus noise at less than 0.014% typical from 20Hz to 20kHz. This supports clean, controlled sound across the audible frequency range.
Built-In MM Phono Input
The M3si includes a moving-magnet phono input for turntables. It is suitable for cartridges giving 1.5mV or more, including high-output MC types, and has a 50k ohm input impedance.
Asynchronous USB-B Input
The USB-B input supports asynchronous digital audio up to 24-bit / 96kHz. This allows direct connection from a computer-based audio source.
Four Line-Level RCA Inputs
With four line-level RCA inputs, the M3si can connect multiple analogue sources, such as a CD player, streamer, DAC, tuner, or cassette deck.
Preamp Output for Future Expansion
The preamp output gives the M3si more system flexibility. It can be used with a power amplifier, subwoofer, or other suitable system expansion. Audiophilia also highlighted the value of its preamp outputs, line outputs, and home theatre bypass flexibility.
Accurate MM Phono Stage
Musical Fidelity notes that the M3si phono stage offers accurate RIAA equalisation and strong MM performance. This makes it a practical amplifier for vinyl systems without requiring an immediate external phono stage.
Strong Signal-to-Noise Performance
The amplifier section has a signal-to-noise ratio of greater than 98dB A-weighted, while the phono input is specified at greater than 70dB A-weighted. This supports low-noise music playback.
Clean, Full-Width Chassis
The M3si uses a classic full-width chassis measuring 440mm wide, with a clean front panel and central volume control. Audiophilia praised its clean, modern layout and solid build quality.
Remote Control Convenience
The M3si includes remote control operation, making it practical for everyday lounge and listening-room use.
Perfect System Match
A strong match would be the Musical Fidelity M3si, a quality Pro-Ject turntable with MM cartridge, a capable streamer or CD player, and revealing passive speakers.
For a compact but serious vinyl system, pair it with a Pro-Ject Debut Carbon EVO or X1 and speakers from ELAC, Triangle, Paradigm, or Focal. For larger rooms, match it with efficient floorstanding speakers that suit its clean, powerful presentation.
Product Comparison Snapshot
| Model | Best For | Key Difference |
| Musical Fidelity M2si | Simple analogue stereo systems | Lower model, fewer input options, no built-in USB DAC or MM phono stage |
| Musical Fidelity M3si | Vinyl and digital stereo systems | 85W/ch, MM phono, USB-B 24/96, preamp output |
| Musical Fidelity M5si | Larger rooms and more demanding speakers | More powerful step-up integrated amplifier |
| Musical Fidelity M6si / M6xi | Premium high-power systems | Higher-output, more advanced amplifier platform |
Specifications
Brand: Musical Fidelity
Model: M3si
Product Type: Integrated Stereo Amplifier
Amplifier Type
Integrated amplifier
Power Output
85 watts per channel into 8 ohms
Total Harmonic Distortion + Noise
Less than 0.014% typical, 20Hz to 20kHz
Signal-to-Noise Ratio
Greater than 98dB, A-weighted
Frequency Response
+0, -0.1dB, 10Hz to 20kHz
Analogue Inputs
4 x line-level RCA / phono inputs
Phono Input
1 x MM phono input
Phono Sensitivity
3mV nominal
Suitable for cartridges giving 1.5mV or more, including high-output MC types
Phono Signal-to-Noise Ratio
Greater than 70dB, A-weighted
Phono Input Impedance
50k ohms
Phono Frequency Response
RIAA / IEC ±1dB, 20Hz to 20kHz
Digital Input
1 x USB Type-B
USB Audio Support
Asynchronous data stream up to 24-bit / 96kHz
Outputs
Speaker outputs
Preamp output
Line output
Home Theatre Bypass
AUX1 / HT input supported
Remote Control
Included
Dimensions
440mm (W) x 100mm (H) x 400mm (D)
Weight
9.2kg unpacked
13kg packed
Finish
Black
Silver
Rapallo Product Data
MPN: M3si
SKU: MF-M3SI
EAN / UPC / GTIN: 9120082385718
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