Gryphon Apex

Gryphon Apex Amplifier

The Gryphon Apex is the flagship power amplifier from Gryphon Audio Designs, and the most powerful and fully realized expression of the company's lifelong commitment to pure Class A amplification. Available in both stereo and mono configurations, it delivers 210 watts per channel into 8 ohms in stereo or 225 watts per channel as a monoblock, with output power that continues to scale as impedance drops, reaching nearly 1,700 watts into 1 ohm in mono. Introduced in 2022 and designed without compromise in cost, scale, or engineering, the Gryphon Apex represents the current pinnacle of what Gryphon believes is possible in high-end power amplification.

The Pinnacle of Gryphon's Amplifier Line

The Apex sits at the very top of Gryphon's power amplifier range, above the Antileon Revelation and Mephisto, and is the product of decades of accumulated experience across all three of those lines. Years of developing the Antileon EVO and Mephisto, combined with ongoing research into circuit topology, component selection, and thermal management, ultimately converged in the Apex. It is the amplifier Gryphon built when cost and scale were removed as constraints, and performance was the only objective.

In its year of release, the Apex Stereo was named Stereophile's Amplification Component of the Year, recognized by Michael Fremer in his August 2022 review as a singular achievement in power amplification. The Apex also earned a Reviewers' Choice award from SoundStage Ultra and a Recommended Reference Component designation from SoundStage Hi-Fi.

Pure Class A at the Extreme

The Apex builds on Gryphon's founding philosophy of pure Class A operation, first established with the DM100 in 1991, and takes it to a scale previously unavailable in a single stereo chassis. At Bias High, the stereo Apex operates in full Class A at 210 watts per channel; the mono version reaches 225 watts under the same conditions. Bias Mid provides 100 watts of pure Class A for everyday listening, while Bias Low keeps the circuitry ready without full thermal loading.

Unlike Class A/B amplifiers that rely on transistor switching and introduce distortion at the zero-crossing point, the Apex amplifies the full audio waveform in Class A at all times. Gryphon is emphatic on this point: there are no engineering shortcuts to pure Class A. It demands heavy transformers, very large heatsinks, large quantities of expensive components, and costly assembly. The Apex fulfills every one of those requirements without reservation.

Power Supply and Output Stage

Each Apex chassis houses 64 very high-current bipolar output transistors, two custom-wound 2,000VA toroidal transformers, and a capacitor bank of 1,040,000uF, exceeding 1 Farad of energy storage per stereo chassis. A mono pair doubles that figure to over 2 Farad combined. The output transistors are locally decoupled with an array of premium zinc foil capacitors, a component chosen for its loss factor more than ten times lower than metallized polypropylene film types.

The driver section operates from its own optimized power supply fed from dedicated windings on the toroidal transformers, and carries its own separate bank of high-grade capacitors. A completely independent transformer and linear power supply serves all display and control circuits, ensuring that digital noise from those circuits cannot reach the amplifier stages. The result is a power reservoir deep enough that the Apex essentially does not register the loudspeaker as a load; reactive impedance swings, back-EMF, and frequency-dependent dips are absorbed without effect on the amplifier's operating point.

Circuit Architecture

The Apex input stage employs an extremely low-capacitance Class A J-FET input buffer, followed by a balanced dual differential Class A circuit and a fast, symmetrical Class A voltage amplification stage. Zero global negative feedback is employed throughout. DC coupling is implemented via DC servo circuitry. Internal signal path wiring uses Gryphon Vanta single-crystal solid-core silver/gold cable, chosen for its neutrality and resolution. Balanced XLR inputs are provided exclusively, with the mono version adding an XLR pass-through to simplify chaining between preamplifier and a second chassis.

The circuit boards are 4-layer designs with copper conductor traces up to 105 microns thick, compared to the 35 microns common in most audio products. The non-magnetic aluminum chassis applies constrained-layer-damping technologies throughout to minimize resonance, and the specification of non-magnetic materials across the entire structure virtually eliminates magnetically induced distortion. Individual left and right transformer castings are mechanically decoupled from one another within the chassis.

Green Bias: Intelligent Class A Management

The three-position Green Bias system, inherited from Gryphon's amplifier tradition and refined for the Apex, allows the listener to manage the thermal and electrical operating point to suit the listening session. When connected to a compatible Gryphon preamplifier via the Green Bias link, bias transitions happen automatically in response to the preamplifier's volume control position, shifting upward as listening levels rise and downward during quiet passages or standby. The Green Bias cable is entirely outside the signal path and has no influence on audio performance. Firmware for the Apex is upgradeable via USB, a provision unique at this level.

Chassis and Physical Scale

The Apex chassis was designed by Flemming E. Rasmussen, whose background in fine arts and Scandinavian industrial design has defined Gryphon's visual identity from the beginning. The deep black, Nordic Noir aluminum enclosure is both the aesthetic and acoustic foundation of the amplifier: its mass provides a vibration-proof environment for the sensitive electronics inside, while its non-magnetic material specification reduces electrical interference to a minimum. The stereo chassis weighs 202 kg and measures 59.3 x 37.1 x 88.6 cm; a mono pair totals 404 kg. Gryphon's proprietary speaker binding posts, which debuted on the Apex, accept bare wire, spade lugs, and banana connectors.

The front panel presents capacitive touch controls for bias selection, mute, and standby, alongside a comprehensive array of status indicators. Soft-start circuitry prevents in-rush current from tripping domestic circuit breakers. Standby power draw is under 0.5 watts per chassis.

Critical Reception

Writing for SoundStage Ultra, Jeff Fritz called the Gryphon Apex Stereo "the most impressive electronic component I've yet reviewed," adding that he had never heard its equal among power amplifiers. In Stereophile, Michael Fremer praised the Apex's combination of fast transient attack, generous sustain, and clean decay, describing it as possessing PRaT in a way that simultaneously accelerated the pace of the music and deepened each musical gesture. The amplifier won Stereophile's Amplification Component of the Year for 2022 and holds a Recommended Reference Component designation from SoundStage Hi-Fi.

The Gryphon Apex is a product for those who regard power amplification as the last link before the loudspeaker and refuse to accept any compromise at that stage. It asks a great deal of the listener's room, infrastructure, and system, and returns something few amplifiers at any price can claim: the full authority of pure Class A over any loudspeaker load, delivered with the finesse and neutrality that Gryphon has pursued since 1985.