he Marantz MM7025 is a two-channel power amplifier that will add muscle to any system and is suitable for both home theater and serious hi-fi kit.
The design of the Marantz MM7025 amplifier favors a discreet industrial design. The device has a metal chassis with anti-vibration properties. The developed cooling system for the output transistors includes a fan installed at the end of the cylindrical radiator, which blows heated air out. The rotation speed of this cooler is controlled by a temperature sensor. The front panel, combining aluminum and plastic, matches the appearance of the latest generation branded components. In the center there is a round display, backlit in blue and reminiscent of the top-end Marantz equipment. It contains LED indicators for the protection circuit (Protect), power and automatic shutdown (APOFF). In the lower right corner there is a button to turn off the display backlight. The standby mode key is located at the bottom of the left section.
Thanks to a large W-shaped transformer, two electrolytic capacitors with a capacity of 15,000 uF, as well as a proprietary LDPS linear power supply, the Marantz MM7025 amplifier is capable of delivering 140 W per channel at an impedance of 8 ohms and 170 W per channel at 6 ohms. The topology of the circuits provides for current feedback, which has a positive effect on the stability of operation and sound dynamics. An additional push-pull circuit is used, similar to the contours of the branded power amplifier SM-11S1. High-speed efficient LAPT transistors are used in the output stages. The circuit design contains selected components – film capacitors, etc.
The Marantz MM7025 amplifier has the following inputs: balanced XLR and standard RCA, as well as selectors for choosing between them (for each channel). There is an infrared port, trigger jacks and connectors for connecting via the D-Sub system bus, which makes it easier to control the tip as part of the Marantz system. There are two pairs of screw gold-plated terminals for connecting speaker systems. The device can be used in combination with multi-channel power amplifiers – MM7055 and MM8077.
The Marantz MM7025 will become a strong link in any system and will help not only enhance its power potential, but also significantly improve dynamics and speed, without losing the transparency of the sound and the three-dimensionality of the stage.
Rated power 140 W per channel into 8 ohms; 170 W per channel into 6 ohms
Frequency response 8 Hz – 100 kHz (±3 dB)
Harmonic distortion 0.03% (20 Hz – 20 kHz)
Signal-to-noise ratio 105 dB
Damping factor 100
Inputs balanced (XLR connectors), unbalanced (RCA connectors)
Input sensitivity/input impedance 1.2 V/22 kΩ (unbalanced input); 2.4 V/30 kOhm (balanced input)
Speaker output 2 pairs of gold-plated screw terminals
Other switching IR port (3.5 mm), two trigger connectors (12 V), connectors for connecting via the proprietary D-Sub bus
Block power supply W-shaped transformer, total capacitance of capacitors – 30000 uF
Power consumption 330 W
Power consumption in standby mode 0.2 W
Kit kit RMK8754MSP for installing the amplifier in a rack rack is optionally available
Dimensions (WxHxD) 440x126x352 mm
Weight 10.8 kg