Marantz MA9s2: Reference Series Monaural Power Amplifier

"one of the very best power amps we've ever heard, and the few we've tested that better this performance either cost much more, or only deliver a fraction of the MA-9S2's muscle" - What Hi-Fi? Sound and Vision

The MA9s2 defines new horizons in both musical performance and contemporary elegance.

When you first see the MA9S2, you'll be impressed with its clean yet purposeful look. The 35mm-thick aluminum chassis and double-layer bottom plate forms an extraordinary rigid structure. Copper coating isolated delicate internal circuitry from extraneous interference.

Power output is the same (300 watts into 8 ohms, 600 watts into 4) as that of the MA-9S1. This "double down" capability speaks directly to the MA9S2's current delivery prowess and, consequently, its ability to absolutely control any loudspeaker. Although this "brute force" approach might be adequate for some, the S2 incorporates several advances designed to further improve sound quality.

First, consider the power supply. The toroid power transformer benefits from a newly-developed "dual hemisphere" design with acoustical isolation augmented by silicon steel and a damped aluminum case. This greatly reduces internal vibration and sets the stage for finer resolution of sonic nuances. Shottky barrier diodes provide rectification for the voltage amplification stage to eliminate subtle ripples that can negatively impact overall clarity. Finally, the storage capacitor bank so important for the current amplification stage is 50% larger than that used in the S1 for even more prodigious yet superbly controlled bass response.

In addition to fully balanced differential topology, the S2 uses current feedback implemented with six HDAM-SA modules for faster response and lower noise.

Flexibility is a key element in the MA9S2's appeal, too. Three switchable inputs (two single ended, one balanced) complement the biwire-capable WBT speaker outputs. The high-precision power meter lets you keep tabs on the amplifier. Or you can switch it off completely for concentrated listening.

All in all, the S2 is a textbook example of meticulous engineering. As did the original, this contemporary masterpiece redefines the art of audio amplification.

• Reference Series full balanced monaural power amplifier
• Fully re-worked and re-voiced version of famous MA-9S1
• Ultra stabile power output of 300 Watts at 8 Ohms RMS and 600 Watts at 4 Ohm RMS
• Current Feedback technology for fast and accurate signal handling
• Audiophile 2-stage circuit concept for best signal to noise ratio of 120dB
• Instantaneous current delivery capability
• Current peak level capability of incredible 150 ampere
• Marantz newly developed HDAMs for Super Audio (HDAM SA)
• Shielded Super Ring Core power transformer and Shottky barrier diodes
• Choke Input system to reduce rectifier harmonic noise
• Ultra low impedance amplifier
• Rigid multi layer chassis construction with aluminium front and side panels
• Multi-layer solid copper plated chassis, rear panel and system block shielding
• One balanced and two unbalanced inputs (selectable)
• Two low impedance WBT speaker terminals for bi-wiring
• Blue eliminated power meter (switchable)

Marantz MA9s2 Reference Series Monaural Power Amplifier Reviews

What Hi-Fi? Sound and Vision - 5 Star Award
An effortless performer that has impressive resolution and class-leading composure; excellent build; understated styling.

Marantz is a rarity in the world of home entertainment: it's one of the few brands to cover all bases from budget to high-end without ever seeming out of place. And this monobloc design is a great example of top-end audio.

The MA9S2 is a beast in terms of size, weight and power output (300 watts), but it offers a dose of real finesse behind all that bravado. There's still just a hint of politeness, but in every other sense this is a world-class power amp.

We'd go so far as to say it's one of the very best power amps we've ever heard, and the few we've tested that better this performance either cost much more, or only deliver a fraction of the MA-9S2's muscle.

Audio Review - Oct 2009
For the price of admission, you get a beautifully crafted product with all of the features one could wish for to assure a perfect installation. Combining true tube-like magic in the midrange and treble with a rock-solid bass foundation, the Marantz amplifiers are revolutionary products.

Let me state unequivocally that I love the sound of these very fine amplifiers. Their extraordinary performance and easy livability are everything I have ever wished for in a power amplifier. The Marantz MA-9S2 Reference Series power amplifiers have taken up permanent residence as my references. Check them out. Happy listening!

Home Entertainment (review of the MA-9S2 SC-7S2, and SA-7S1) by Gary Altunian
To an audiophile's ear, this is heaven. Each musical element was distinct and clearly separated from the others.

Marantz MA9s2 Reference Series Monaural Power Amplifier Specifications

In/Outputs
Audio
Main In/Pre Out    Balanced: 1, Unbalanced: 2
Bridge Mono Mode
Headphone Out    0
Analog L&R In    0
Analog L&R Out    0
Other
D-Bus Remote (RC-5) In/Out    0/0

Details
Number of Channels    1
Output Power/Channel (20Hz - 20kHz)    300W (8 ohms), 600W (4 ohms)
HDAM    HDAM-SA
Power Transformer    Very Large Capacity Toroidal w/Shielded Case
Discrete Amplifier Stage    Yes
Individual Level Adjust    Attenuator (0/-3/-6/-9/-12/-oo dB)
THD (20Hz - 20kHz)    0.01% (20Hz - 20kHz, 8 ohms Load)
Input Sensitivity/Impeance    Balanced&Unbalanced: 1.7V/20k ohms
Frequency response    3Hz - 120kHz (+0/-3 dB)
S/N Ratio    Balanced&Unbalanced: 123dB (IHF-A)

General
Color    Champagne Gold
Front Panel    3pces Aluminium
Power Requirement    AC 120V 60Hz
Power Consumption    500W
Dimensions (W x H x D)    459 x 451 x 198mm
Weight    37.4kg