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.
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"Not just noteworthy in their own right, these two components gel together to create a sound that's pure 'Marantz'.
Appealing to a wide range of listeners, there's no sense of a celebratory rosy red glow that might otherwise embellish the sound of disc player or amplifier.
They will surely be snapped up by Marantz fans and collectors, but their performance will delight even without the halo of their backstory."
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 aluminium panes for rigidity and features a laser-engraved Ken Ishiwata signature to commemorate his legacy.
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.
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.
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.
The HDAM SA3 circuitry offers the cleanest signal path and optimal dynamics through the amplifier, which delivers 100W per channel into 8ohm speakers, or 200Wpc into 4ohm. The audio signal path is made entirely from discrete components for optimal quality, with the RIAA equalisation split into passive and active components: RIAA correction is carried out by a Marantz HDAM, while the all-discrete amplification runs in minimum-distortion Class A.
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 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.
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.
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.
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.
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.
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.
|Current Feedback Topology||Yes|
|Phono EQ||Marantz Musical Premium|
|HDAM Version||SA3, SA2|
|Power Transformer: Toroidal / El||SMPS|
|High Grade Audio Components||Yes|
|Symmetric PCB Layout||Yes|
|Aluminium Extrusion Heat Sink||Yes (Separate)|
|Copper Plated Chassis||Yes|
|Balance / Bass / Treble / Loudness||Yes / Yes / Yes / No|
|Linear Drive Power Supply||Yes (Pre-Amplifier Stage)|
|Liniear Volume Control||Yes|
|BI-AMP and Multichannel Option||Yes|
|System Block Shielding||Copper|
|Double Layer Bottom Plate||Yes|
|Low Noise OELD Display||Yes|
|5mm Aluminium Top Plate||Yes|
|Phono Input||MM / MC|
|Power Amp Direct IN||Yes|
|Gold Plated Cinch||Yes / CD & Phono Nickel-Plated|
|Speaker Terminals||Marantz SPKT-100+|
|Number Of Terminals||2|
|Floating Control Bus (3.5 mm mono jack x 2)||Yes|
|Power Output (8 / 4 Ohm RMS)||100 W / 200 W|
|Frequency Response||5 Hz - 50kHz|
|Total Harmonic Distortion||0.005%|
|Input Sensitivity: MM||2.3 mV / 39 kohm|
|Input Sensitivity: MC||250 µV / 100 ohm|
|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)|
|Available Colours||Gold / Black|
|Metal Front Panel||Yes|
|Auto Power Off||Yes|
|Detachable Power Cable||Yes|
|System Remote Function||Yes|
|Maximum Dimensions (W x D x H)||440mm x 453mm x 127mm|
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