Gryphon Colosseum Power Amplifier | Suncoast Audio

Gryphon Audio Colosseum Power Amplifier

Have questions about this product?

We love answering questions. Talk to an expert now.


Colosseum Power Amplifier has a modern design with a classic audiophile heart.

The Colosseum represents the past 25 years of Gryphon Audio history of developing cutting-edge home audio equipment. They are steadfast in their design principles to focus on combining new technology with tried and true products.


Like every Gryphon, Colosseum power amplifier is designed by founder and CEO, Flemming E. Rasmussen and manufactured in Denmark under his creative guidance. Each component represents his extensive experience not only as an artist but as an industrial designer and can be seen in the Gryphon’s minimal and strong design. The Colosseum represents a new chapter in the Gryphon Audio USA tale.


The Gryphon Audio USA Tale

It’s not a typical brand story, rather it began with a close circle of friends who created the perfect product for themselves to see how far they could push the envelope. The result, the legendary Head Amp which still remains a sought after addition to the perfect audiophile system as well as the reference for countless other products. This approach laid the foundation for all future product endeavors.


Gryphon Colosseum a.k.a. The Tower of Power

The Colosseum power amp is Gryphon’s newest addition since it’s Mirage preamp. For the greatest possible convenience, Colosseum can be configured to turn on automatically when the preamp turns on and powers down automatically after a time period of no signal. It’s built with a 100% Class A bias and weights just shy of 177 pounds.

While the Colosseum takes Gryphon’s distinctive styling one step further, our ongoing commitment to uncompromising sound quality is reaffirmed by a wealth of details such as 2 x 160 Watts Pure Class A output power, 48 High-current bipolar output transistors, a 340,000 microFarad power capacitor bank and flat frequency response extending beyond 350 kHz.

The strict dual mono amplifier is suspended between the curved, de-coupled side panels in a unique configuration that provides optimal layout and operating conditions for all components. The dual transformers are isolated and effectively shielded to prevent unwanted interaction with other components.

Unique mechanical design ensures optimal thermal tracking between drivers and output devices. The separate driver section has its own power supply from individual windings on the custom-built toroidal transformers and features its own generous bank of proprietary Gryphon capacitors.

The output section employs Sanken bipolar output devices for extreme reliability in addition to outstanding sonic performance. These transistors deliver momentary peak power of 4,000 Watts per channel without overload. Each of the 48 transistors is bypassed with individual film capacitors.

In the best Gryphon tradition, the Colosseum utilizes a completely independent transformer and power supply for display and control circuits, creating an effective firewall that prevents digital noise generated by these circuits from reaching the amplifier circuits.

Negative feedback is not used and DC coupling is achieved with DC servo circuitry. Internal wiring in the signal path is kept to an absolute minimum. The finest Gryphon Guideline Reference silver cable is used throughout.
The Gryphon Colosseum is fitted with balanced inputs exclusively. Eliminating phono sockets in the signal path ensures the integrity of the sensitive audio signal.

The custom-built Gryphon speaker terminals accept bare wire, spade lugs, banana connectors for a tight, reliable connection.


Pure Class A and Green Bias

True Class A operation has always been a Gryphon benchmark, because there is no substitute for the sheer musical magic of pure Class A. The Colosseum operates in true Class A mode with maximum power instantaneously available at all times, for unrivalled speed, control and accuracy. Once you experience the effortless realism and musicality of pure Class A, there is no turning back.

For situations where full Class A operation is not required, the Gryphon Colosseum incorporates proprietary Green Bias circuitry, which automatically adjusts bias level to match the selected volume setting when paired with a Gryphon Mirage or Sonata Allegro preamplifier. Tracking bias in this way significantly reduces power consumption and heat generated by the amplifier without compromising Class A audio performance.

For use with a preamplifier without Green Bias, the Gryphon Colosseum also features three-step manual bias adjustment.


Your Design Statement

The slim, majestic oval-shaped high rise tower of the Gryphon Colosseum occupies minimal floor space. With end plates machined from solid blocks of 40 mm black polyvinylmethacrylate and smart, curved side panels of your choice, the Colosseum is a strikingly handsome minimalist sculpture that will enhance any space.

Uniquely, the design of your personal Gryphon Colosseum power amplifier is entirely up to you. Thanks to the modular construction of the sleekly curved side panels, your Gryphon dealer can remove and replace them easily, for custom styling options limited solely by the owner’s imagination.

Whenever you re-decorate or move, you can have your Gryphon Colosseum re-dressed and updated to always keep pace with your evolving personal style and interior decor.

This exclusive service and extraordinary level of flexibility was pioneered by Gryphon for our Atlantis, Trident and Poseidon loudspeaker systems and remains unique in home audio. It is our philosophy that the Gryphon owner deserves not only sound quality to the highest audiophile standards, but also a personalised design statement equally pleasing to the eye.


An Aspirational Ideal

A new component from Gryphon Audio Designs is always a noteworthy event in and of itself. Gryphon product introductions are exceedingly rare, because our carefully considered designs immediately take a well deserved place at the forefront of their field and maintain that elevated status for many years.

Just as a Formula One racing machine can raise the standard and inspire the competition as well as makers of conventional street legal vehicles for years to come, each Gryphon component takes audio technology and the understanding of music reproduction to new heights that serve as inspiration for others and have made Gryphon Audio Designs a force to be reckoned with in High End audio for two and a half decades.

As always throughout our history, it is the mission of the Gryphon Colosseum Stereo Power Amplifier to deliver the best of both worlds, superb musical performance allied with a rarefied design aesthetic to make an uncompromising statement that the proud Gryphon owner instinctively respects and appreciates.

For a first-hand experience of the extraordinary musical universe that a Gryphon system can create, we cordially invite you to seek out your local authorized Gryphon Audio Designs showroom.

Product features

  • Pure Dual Mono configuration
  • Zero global negative feedback
  • 48 high current bipolar output transistors
  • 340,000 µF capacitor bank
  • Balanced circuit
  • DC servo-coupling
  • Gryphon Guideline silver internal wiring
  • Decoupled Printed Circuit Boards and transformer castings
  • Military spec. double-sided printed circuit boards
  • Two separate Holmgren toroidal transformers with internal magnetic shielding
  • Separate power supplies for digital and analogue circuits
  • Gold-plated Swiss Neutric XLR input sockets
  • Gold-plated custom-built binding posts
  • Vacuum Fluorescent Display
  • Adjustable display brightness
  • Selectable automatic Green Bias setting or manual Low/Mid/High bias
  • Firmware upgrades via PC
  • Non-invasive protection system

Specifications & Dimensions

2 x 160W, 8Ω, 115V/230V AC supply
Output impedance: 0.023Ω
Bandwidth (-3 dB): 0.3Hz to above 350 kHz
Power Supply Capacity: 340,000 µF
Gain: +31.5 dB
Input Impedance (20 Hz – 20 kHz): 20 kΩ
76x27x63 cm (HxWxD), 80 kg net weight
88x50x76 cm (HxWxD), 110 kg shipping weight