Marantz PM-KI RUBY Integrated Amplifier

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PMKI RUBY
Limited Collector's Edition

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$ 9,499.00

Marantz has been designing and making amplifiers for more than 65 years, and for 40 of those the products have reflected expertise of Ken Ishiwata. Now, to mark his four decades with the company, the PM-KI Ruby amplifier has been developed and tuned by a highly experienced engineering team led by KI himself. It features a fully discrete two-stage design with separate power supplies for the pre-amplifier and power amp — plus, a moving coil/moving magnet phono stage complete with Marantz Musical Premium Phono EQ circuit and Marantz HDAM technology for signal purity and exceptional audio quality. PM-KI Ruby is built on a vibration-resistant double layer chassis with thick aluminum panes for rigidity and features a laser-engraved Ken Ishiwata signature to commemorate his legacy.

Key Features

  • Engineered and extensively tuned legendary Marantz sound master Ken Ishiwata and his team, drawing on more than 65 years of Marantz amplifier design knowledge
  • Marantz high-resolution preamplifier stage with proprietary HDAM technology
  • Switching power amplifier design derived from flagship PM-10 amplifier
  • Generous output: 100W + 100W (into 8ohm), 200W + 200W (4ohm)
  • Fully-discrete, two-stage design for signal purity, with separate power supplies for preamp and power amplifier sections to reduce interference 
  • Toroidal transformer dedicated to preamp for clarity and powerful sound
  • Current feedback design with newly-developed wide-range circuitry
  • HDAM® SA3 circuitry for clean signal and optimal dynamics
  • MM/MC Phono input with new discrete Marantz Musical Premium Phono EQ circuit
  • Thick nickel-plated copper independent input terminals for CD and Phono, plus Marantz-original high-quality/high-purity copper-plated speaker terminals
  • Linear volume control with new electric volume system
  • High-quality construction with double-layer chassis, 5mm thick aluminum top lid, solid aluminum front and copper-plated chassis
  • High-grade, carefully selected audio parts: ultra-low leak current Schottky diodes, low noise complementary transistors, high-grade resistors, newly developed custom electrolytic capacitors, audio grade film capacitors and mica capacitors.
  • Laser-engraved Ken Ishiwata signature and Ruby motif, marking Ishiwata’s 40-year Marantz legacy

Celebrating 40 Years of Passion

Designed to celebrate the 40-year anniversary of legendary Marantz sound master, Ken Ishiwata, PM-KI Ruby features pinnacle performance that’s synonymous with Marantz excellence. Complete with thoughtful engineering, painstaking tuning and extensive listening sessions, PM-KI Ruby achieves the elevated output worthy of its name. Elegantly shows Ishiwata’s laser-engraved signature to commemorate the design and heightened listening experience that honours the decades-long partnership between him and Marantz.

Extensive Sound Tuning

Led by Ken Ishiwata’s extensive, meticulous approach to tuning, the larger Marantz engineering team applied more than 65 years of experience and HiFi knowledge to create PM-KI Ruby, resulting in a final product that is a testament to Ken Ishiwata and the Marantz legacy.

Marantz HDAM Technology 

Marantz developed its own discrete circuit boards called Hyper-Dynamic Amplifier Modules, or HDAMs, to replace the chip-based amps used elsewhere. Using discrete surface mount components with short mirror-image left and right signal paths, HDAMs outperform the regular integrated Op-amps dramatically in Slew Rate and noise level. The result is much more dynamic, accurate and detailed sound. Over the years, Marantz has developed different HDAMs to fit the particular requirements of players and amplifiers. The PM-KI Ruby uses the latest high-grade SA3 version. Combined with optimized circuit design layout and carefully selected components, the PM-KI Ruby provides exceptional sound quality and performance.

Marantz Musical Premium Phono EQ

Designed to deliver optimal sound quality by simplifying the signal path, the Marantz Musical Premium Phono EQ stage in the PM-KI-Ruby amplifier can be used with both moving magnet and low-output moving coil cartridges, thanks to a built-in MC head amplifier. Distortion is reduced by using two-stage amplification in the phono stage, and Marantz HDAMs are combined with JFETs (junction gate field effect transistors) in the input stage, giving high input impedance. The exclusion of coupling capacitors further simplifies the design, reducing signal distortion and enhances signal purity.


High Quality Volume Control

Newly developed electric volume control uses the latest volume control IC to realize better channel separation, dynamic range and distortion-reduction, while retaining the operational feel of an analogue volume control device. The amplifier employs new Marantz-designed electric volume control for high linearity and best-in-class channel separation.


Current Feedback Amplifier

Current Feedback amplification is a well-known, Marantz-original circuit technology, thoughtfully designed to match the requirements of Super Audio hi-res music for wide-bandwidth, high-speed reproduction. The impedance at the Current Feedback point is limited, generating a very low phase shift. Marantz Current Feedback amplifiers reduce the need for phase compensation by minimizing Negative Feedback (NFB). This simplifies the signal path and results in a high through-rate, excellent transient response and superb sonic transparency across the full bandwidth. Unlike conventional Voltage Feedback topology, Current Feedback also makes the power amplifier insensitive to difficult loudspeaker loads.

Balanced Power Amplification

Drawing on design elements of the PM-10, the PM-KI Ruby is built to leverage enhancements, maintain the purest possible sound and support the power needed to drive the most demanding speakers. The amplifier output stage of the PM-KI Ruby allows a large power output, delivering 2x100W into an 8ohm load, and easily copes with high-impedance speakers thanks to a 2x200W output into 4ohms. The amplifier module connects directly to the rear panel PCB on the PM-KI Ruby to maintain signal purity and sound stability.

Pure Analogue Design

The purely analogue design of the PM-KI Ruby contributes to its noise-reduction structure and clean build. Rather than build the DAC into the amplifier, which would add noise within the chassis, Marantz built the PM-KI Ruby without one and then implemented the DAC in the SA-KI Ruby Super Audio CD Player. This eliminated interference with the delicate analogue signals passing through the amp, maintaining an analogue environment that’s as pure and clean as possible.

Carefully Selected Components

Marantz has a steadfast reputation for choosing the best-possible components for its Premium Series products. The Marantz alternative to the “amplifier on a chip” IC components, the HDAM, is a miniature amplifier module built entirely of discrete components. Marantz engineers selected and optimized the HDAM through extensive listening in dedicated Marantz facilities in Europe and Japan. Extensive, painstaking and meticulous tuning has long been the secret of exquisite-sounding Marantz amplifiers. During the development stage, every part is carefully selected, tested and validated by Marantz audio engineers to ensure audio perfection every time you listen.


Multiple Analogue Inputs and Outputs

In addition to phono and CD analogue inputs, the PM-KI Ruby features two line-level inputs and two pairs of recorder input/output jacks that enable the connection of multiple sources and recorders. Use the PM-KI Ruby as a standalone stereo power amplifier for additional system configuration versatility with the included power amp input, or connect the PM-KI Ruby to an external power amplifier via the stereo pre-amp outputs.


Dedicated Headphone Output

Using Marantz-proprietary HDAM discrete modules, the headphone circuit delivers superb audio fidelity with the widest range of headphone types and impedances, including low impedance headphones.

System Remote Control

Use the elegant remote control to operate the PM-KI Ruby as well as the complementary SA-KI Ruby Super Audio CD Player. The PM-KI Ruby features remote control input and output jacks for additional remote control configuration flexibility.


Built to Perform

Like the complementary SA-KI Ruby Super Audio CD player, the PM-KI Ruby integrated amplifier is constructed to the highest standards with a copper-plated chasses to reduce mechanical and electrical interference. A front panel constructed from thick, heavy, non-magnetic aluminum panels and an 5mm dense aluminum top cover eliminate added interference. Nickel-plated copper independent input terminals for CD and Phono plus Marantz-original high-quality/high-purity copper-plated speaker terminals ensure the best signal possible.

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More Than 60 Years of Audiophile Heritage

Founded in 1953, Marantz has a long and rich history of designing audio components embraced by music lovers and critical listeners around the world. Because Music Matters, the PM-KI Ruby carries on our long tradition of delivering a best-in-class listening experience for music and cinema.

Features

Channels 2
Current Feedback Topology
Phono EQ: Standard / Marantz Musical / Marantz Musical Premium - / - / o
HDAM version SA3, SA2
Power Transformer: Toroidal / El SMPS
High Grade Audio Components
Customised Components
Symmetric PCB Layout
Aluminium extrusion heat sink o (Separate)
Copper plated chassis
Balance / Bass / Treble / Loudness o / o / o / -

Others

Linear Drive Power Supply o (pre-amplifier stage)
Liniear volume control
BI-AMP and Multichannel option
Shottky diodes
System block shielding: copper / metal / none o / - / -
Double Layer Bottom Plate
Low Noise OELD display
5mm aluminium top plate

Inputs/Outputs

Audio Inputs 6
Phono Input: MM / MC o / o
Audio Outputs 2
Power Amp Direct IN
Gold Plated Cinch o / CD & Phono nickel-plated
Speaker Terminals Marantz SPKT-100+
Number of terminals 2
D-Bus
Floating Control Bus (3.5 mm mono jack x 2)
Headphone Out

Specifications

Power Output (8 / 4 Ohm RMS) 100 W / 200 W
Frequency Response 5 Hz - 50kHz
Total Harmonic Distortion 0.01%
Damping Factor 500
Input Sensitivity: MM 2.3 mV / 39 kohm
Input Sensitivity: MC 250
Signal to Noise Ratio: MM / MC 88 / 75 dB
Input Sensitivity: High level 220 mV / 13 kohm
Signal to Noise Ratio: High level 107 dB(2V input/Rated output)

General

Available colors: Gold / Silver / Black / Silver-Gold o / - / o / -
Metal Front Panel
Power Consumption in W 130
Standby Consumption in W 0.2
Auto power off
Detachable Power Cable
Remote Control RC005PMSA
System Remote Function
Maximum Dimensions (W x D x H) in mm 440 x 453 x 127
Weight in kg 15.7

New Zealand Marantz Official Product. Come with New Zealand Marantz Manufactures Warranty.