Stereo amplifier: Marantz PM KI RUBY (Gold)

Stereo amplifier: Marantz PM KI RUBY (Gold)

The device has a fully discrete two-stage design. The preamp section is powered by a toroidal transformer for the purest sound, and the final stage uses a Hypex NCore switching unit (similar to the PM-10) and delivers 100 watts per channel (8 ohms). This design reduces the effect of the output section on the sensitive pre-amp circuits. The latest HDAM SA3 amplification modules are on board to ensure excellent dynamics and detail, high slew rate and minimal noise. Current feedback is used, which provides a wide frequency response, excellent transient response and sound transparency across the entire frequency band, and also allows the PM-KI RUBY to handle even low-impedance speakers.

The amplifier is equipped with a Musical Premium Phono EQ MM / MC phono stage, which is equipped with HDAM modules, JFET transistors, does not use coupling capacitors and has a low noise level.

The case received thick aluminum panels and a two-layer copper-plated chassis, due to which “immunity” to mechanical vibrations and electrical interference is achieved. The thickness of the top cover, for example, is 5 mm. The top edge of the bezel features a laser engraved replica of Ken Ishawata's signature and a miniature ruby inlay. The amplifier is equipped with a linear high-precision volume attenuator, and carefully selected components are installed in its circuits: Schottky diodes, low-noise transistors, high-quality MELF resistors, custom-made electrolytic capacitors, film and mica capacitors for audio, etc.

The model has a wide range of analog inputs, with CD and Phono inputs using special nickel-plated copper RCA connectors. There are recording/monitoring loops and direct entry to the end section. For speakers, there are two pairs of branded screw terminals. There are D-Bus sockets and FCBS bus connectors, allowing you to assemble a Marantz PM-KI RUBY multi-amp controlled system, which is convenient for bi-amping or multi-channel connections. A switch is placed in the rear of the case, which switches the device to Bi-Amp mode.

Characteristics of the stereo amplifier Marantz PM KI RUBY (Gold):

• Output power: 2 x 100W (8 ohms); 2 x 200W (4 ohms);
• Frequency range: 5 Hz - 50 kHz;
• Harmonic coefficient: 0.01%;
• Damping factor: 500;
• Signal-to-noise ratio: 107 dB (preamplifier, @ 2 V input), 88 / 75 dB (MM/MC cartridges, phono stage);
• Input Sensitivity/Input Impedance Using Preamp Line Inputs: 220 mV/13 kΩ (RCA);
• Input Sensitivity/Input Impedance when using direct input into termination section: 1.1 V/13 kΩ;
• Phono Input Sensitivity/Impedance: 2.3mV/39kΩ (MM), 250µV/100Ω (MC);
• Discrete HDMA amplifier modules: SA3, SA2;
• Inputs: 5 line RCA (including CD input with nickel-plated RCA connectors and 2 inputs for recording monitoring), MM/MC phono stage RCA connectors (nickel-plated), RCA input to the output section;
• Outputs: 6.3 mm for headphones, 2 RCA for recording;
• Others: 2 x D-Bus, 2 x FCBS, ground terminal;
• Phono stage : MM/MC, Marantz Musical Premium Phono EQ;
• Speaker output: 2 pairs of quality screw terminals Marantz SPKT-100+ (high purity copper);
• Power supply: linear for the preliminary section (toroidal transformer), pulsed for the terminal section;
• Power consumption: 130 W, standby: 0.2 W;
• Remote control: universal RC005PMSA;
• Dimensions (W x H x D): 440 x 127 x 453 mm;
• Weight: 15.7 kg;
• Color: Gold.