A Patented MM Phono Stage for Serious Vinyl Listening

If vinyl playback truly matters to you, the Accession MM phono preamplifier is a component that demands attention. Built around patented circuitry, it uncovers substantially more musical information while actively reducing the traditional shortcomings of analogue playback. Its design is aimed at listeners who value accuracy as much as emotion. This phono stage is engineered to reveal what is normally obscured. The result is a more faithful and engaging vinyl experience.

Designed for Musical Insight and Practical Control

The Accession stereo phono stage integrates innovative engineering with genuinely useful functionality. It offers selectable fixed or variable output levels, a front-panel volume control, and multiple EQ options for precise system matching. These features enhance flexibility without compromising purity. Operation remains intuitive and refined. Every control exists to serve sound quality rather than complicate it.

A Sound That Elevates Vinyl Playback

The sonic performance of the Accession MM phono preamp places vinyl reproduction on a noticeably higher level. Music emerges with greater clarity, depth, and coherence than typically expected from moving-magnet designs. Long-overlooked techniques are refined here to extract information previously buried in the groove. The presentation feels closer to the original recording session. Subtle textures and spatial cues become clearly audible.

Advanced Engineering to Minimise Interference

The Accession goes further than conventional designs in eliminating unwanted interference. A solid ground-plane circuit board, layered RF filtering, and high-immunity architecture work together to suppress noise. The V2 enclosure adds stainless-steel shielding gaskets behind the front and rear panels, sealing against electromagnetic disturbance. These conductive barriers outperform anodised aluminium alone. The background remains exceptionally quiet even in demanding environments.

Rethinking the Reality of Record Equalisation

Most phono stages misunderstand how record equalisation truly functions. Vinyl equalisation exists due to historical and physical constraints involved in cutting and pressing records. These compromises must be corrected during playback. However, this is only part of the equation. The cartridge itself introduces a significant rising frequency response that also requires correction.

The Overlooked Role of the Cartridge Response

Magnetic cartridges exhibit a pronounced 6 dB-per-octave rising output, forming a 45-degree slope that is entirely separate from record EQ. This behaviour is far from subtle and is widely misunderstood. Traditional phono designs treat record and cartridge equalisation as a single curve. This approach masks detail and increases distortion. Accession challenges this long-standing assumption.

Separating Cartridge and Record Equalisation

The Accession phono stage treats cartridge and record equalisation as two distinct processes. First, it removes the cartridge’s rising frequency contribution in real time. Only then does it apply the correct record equalisation in a second stage. This mirrors the actual sequence of events in vinyl playback. The result is a more precise and natural frequency balance.

A Single-Slope Solution with Measurable Benefits

By correcting the cartridge response first, the complex combined EQ curve is simplified. A single opposing filter slope rotates the response to a neutral position before record EQ is applied. This method allows constant negative feedback across the slope. Input and output impedances remain stable at all frequencies. The cartridge therefore operates under ideal, consistent loading conditions.

Objective Performance, Not Just Subjective Claims

This architecture delivers tangible technical advantages. High-frequency distortion is dramatically reduced, measuring just 0.002% THD at 10 kHz on the fixed outputs. These results are verifiable, not merely perceived. The improvement is audible as smoother treble and greater transparency. Measurements confirm what listeners hear.

Engineering Transparency for the Curious Listener

For those interested in the deeper electronic theory behind the Accession’s design, detailed explanations are available from the designer. The equalisation principles are documented with clarity and precision. This openness reflects confidence in the engineering. It also allows technically minded users to fully understand what makes the Accession different. Few phono stages offer this level of insight.