My Sonic Lab Signature Platinum Review: Yoshio Matsudaira’s Finest Cartridge Yet?

Some phono cartridges impress you with breathtaking detail. Others win you over with warmth and musicality. Very few manage to combine explosive dynamics, exceptional speed, and effortless refinement without asking the listener to compromise somewhere along the way.

That’s exactly why every new flagship from Yoshio Matsudaira attracts so much attention in the analog world.

With more than three decades of experience designing cartridges for legendary names including Koetsu, Supex, Miyabi, Audiocraft, Luxman, Air Tight, and Haniwa, Matsudaira has earned a reputation that very few cartridge designers can match. His latest creation—the My Sonic Lab Signature Platinum—isn’t simply another ultra-expensive moving coil cartridge. It represents decades of refinement built around his proprietary SH-μX magnetic core technology, a design philosophy that allows unusually high output while maintaining exceptionally low internal impedance.

After living with the Signature Platinum for nine months across multiple reference turntables and tonearms, veteran reviewer Richard Mak believes this may well be the finest cartridge Yoshio Matsudaira has ever created.

Yoshio Matsudaira San of My Sonic Lab—the cartridge manufacturer whose company proudly carries his initials (“M” and “Y”)—is widely regarded as one of the world’s finest phono cartridge designers. Few people in the analog industry possess a résumé as accomplished as his.

Before founding My Sonic Lab in 2003, Matsudaira San had already accumulated more than thirty years of experience designing cartridges for Koetsu, Supex, Miyabi, Audiocraft, and Luxman. Today, he continues to develop cartridges for respected brands, including Air Tight, Haniwa, and several others, even if his name isn’t always visible on the finished product.

His fingerprints can be found throughout the modern cartridge industry, making him one of the most influential designers in high-end analog playback.

What Makes SH-μX Technology Different?

What separates My Sonic Lab from many boutique cartridge brands isn’t clever marketing—it’s genuine engineering innovation.

Matsudaira San’s designs produce remarkably high output while keeping internal impedance exceptionally low. Put simply, his cartridges require significantly fewer coil windings than competing designs to generate the same voltage output.

The secret lies in a proprietary high-flux, high-permeability core material known as SH-μX, a genuine breakthrough developed by Matsudaira himself.

Using much smaller coil windings offers several important advantages:

• Greater cantilever mobility
• Faster transient response
• Wider dynamic range
• Increased detail retrieval
• Lower internal distortion
• Reduced phase distortion

This unique engineering approach has fascinated me ever since My Sonic Lab introduced the original Hyper Eminent back in 2003. Since then, I’ve owned several of Matsudaira San’s creations, including the Eminent GL—which shares much of its DNA with the Air Tight Supreme PC-1—and the Hyper Eminent BC, which has remained in my system for more than a decade.

The Quadratic MC-1 Step Up Transformer Review

Even today, the BC continues to serve as one of my personal benchmark cartridges for both reviews and private evaluations.

True Cartridge Manufacturing

Unlike many cartridge companies that outsource manufacturing or license technology, My Sonic Lab remains a genuine cartridge manufacturer.

Matsudaira San oversees virtually every stage of production, from the initial engineering drawings to final assembly. Every cartridge is manufactured entirely in-house, ensuring exceptional consistency throughout the product line.

That consistency is reflected in the sound.

Across the My Sonic Lab range, listeners are rewarded with an unmistakably smooth, elegant presentation that remains refined throughout the entire frequency spectrum. While these cartridges don’t possess quite the lush midrange richness associated with Koetsu or Kondo designs, they also avoid the excessive brightness, sibilance, or etched presentation that can plague some ultra-high-resolution competitors.

The result is a remarkably balanced listening experience that encourages hours of fatigue-free enjoyment.

One Area Where My Sonic Lab Cartridges Fell Short

Even the finest cartridge designers have products with a recognizable personality.

Previous My Sonic Lab cartridges consistently excelled in refinement, transparency, and speed, but they weren’t always the final word in sheer dynamic authority.

The Ultra-Eminent BC, for example, delivers extraordinary detail and lightning-fast transient response, making string instruments almost breathtaking in their realism. However, when faced with large-scale orchestral recordings or the immense power of a concert grand piano, it could occasionally sound just a little restrained compared with the very best cartridges available.

For those recordings, I often turned instead to cartridges like the Clearaudio Goldfinger V2, Lyra Olympos, or even the older Lyra Titan i, all of which offered a greater sense of unrestricted dynamic swing.

That changes with the arrival of the Signature Platinum.

Rather than simply refining the previous flagship, Matsudaira appears to have addressed the one criticism enthusiasts occasionally had about earlier My Sonic Lab designs—ultimate dynamic impact.

Meet the Signature Platinum

The $11,995 My Sonic Lab Signature Platinum builds upon the foundation established by the Signature Gold while incorporating a slightly larger SH-μX magnetic core than previous models.

Visually, it shares much with the outgoing Ultra-Eminent BC. Both employ a rhodium-plated body and a boron cantilever, but the Signature Platinum introduces a Black Ion-hardened titanium body that further suppresses unwanted resonances.

The Chord Electronics Huei Phonostage

That reduction in mechanical resonance becomes one of the primary reasons behind the cartridge’s remarkable increase in resolution and overall realism.

Like every My Sonic Lab design, efficiency remains one of its defining characteristics.

The Signature Platinum produces 0.5mV of output while maintaining an astonishingly low internal impedance of just 1.4 ohms.

For comparison:

• Clearaudio Goldfinger V2 produces 0.6mV but carries a much larger 50-ohm coil.
• Lyra Atlas offers a similarly low internal impedance of approximately 1.52 ohms, yet produces only half the output at 0.25mV.

Looking across today’s analog landscape, very few moving coil cartridges can match this extraordinary combination of output level and electrical efficiency.

Nine Months of Listening

Over a nine-month evaluation period, the Signature Platinum was installed on four different tonearms:

• Supreme Analog Tangenta
• DaVinci Virtu
• Reed 3P
• Glanz MH-124SX

It also spent considerable time on two exceptional turntables:

• JV Verdier La Platine Vintage
• Micro Seiki RX5000 equipped with a flywheel

While both combinations produced superb results, the Micro Seiki ultimately proved to be the more enjoyable partner, allowing the Signature Platinum to demonstrate its full musical capabilities.

Official Website: mysoniclab