• Produced from 1971 to 1980
• 300 Watts x 2 channels, 600 Watts x 1 channel
• Autoformers included
• The amplifier that powered the Grateful Dead's "Wall of Sound"

The McIntosh MC-2300 is a solid-state power amplifier built by the American high-end audio company McIntosh Laboratory between 1971 and 1980.[1]

McIntosh produced the MC-2105 (with blue meters) and the MC-2100 (without) between 1969 and 1977. Both were 100-watt-per-channel (200-watt mono) stereo amplifiers. The MC-2300 was succeeded by the more powerful MC-2500 (500 WPC stereo/1000 watts mono), sold from 1980 to 1990, and then the MC-2600 (600 WPC stereo/1200 watts mono), available from 1990 to 1995.[1]

The improvisational rock group the Grateful Dead used 48 McIntosh MC-2300 amplifiers as the main power source for their massive public address system, the Wall of Sound. Designed by Owsley "Bear" Stanley and others, this system used more than 26.000 watts of continuous power fed into JBL and Electrovoice speakers and was renowned for its natural, low-distortion stereo sound that carried 600 feet without significant degradation.[4] The Wall of Sound was only used from March to October 1974.

In late July 1973, the Grateful Dead played the Watkins Glen Summer Jam in the Finger Lakes region of New York, along with the Band and the Allman Brothers Band. This concert was attended by 600.000 people, double the number of people who attended the Woodstock festival in August 1969. Due to the huge crowd, a significant number of spectators could neither see the stage nor adequately hear the music coming from it. Additional transmission towers were installed.missionand, but this required more amplification power. Sound engineer Janet Furman was sent by helicopter with $6000 in cash to nearby Binghamton, home of McIntosh Laboratories, to obtain five additional MC 2300 amplifiers.[5] Despite it being the weekend, she managed to locate the owner, purchase the amplifiers from the factory, and return to the festival site, with the overloaded helicopter skirting the skyscrapers and narrowly avoiding catastrophe. Through a combination of persistence and luck, the extra MC 2300s were incorporated into the sound system, successfully providing high-quality music to the gigantic audience.

Grateful Dead guitarist Jerry Garcia also favored the MC 2300, using one for many years in his gear pile (see photo). On October 14, 2021, during a Sotheby's auction titled From the Vault: Property from the Grateful Dead and Friends[7], Garcia's last onstage rack containing an MC2300 sold for $226.800. Even more impressive is Garcia's personal MC2300, known as the “Budman” due to its Budweiser-affiliated mascot sticker, which sold at the same auction for $378.000. This amplifier is the longest-lived piece of gear used by the Grateful Dead. Seven MC2300s have been sold in total:

Lot 36: Jerry's Budman MC2300: $378.000
Lot 37: WoS Vocal Cluster MC2300: $35.280
Lot 38: WoS Cluster Plan: $75.600
Lot 39: WoS MC2300: $40.320
Lot 40: MC2300 by Bob Weir: $37.800
Lot 41: WoS MC2300: $25.200
Lot 43: WoS MC2300: $94.500

Output Power: 300 watts per channel into 8Ω (stereo), 600 watts into 8Ω (mono)

Frequency Response: 20Hz to 20kHz

Total harmonic distortion: 0.25%

Damping factor: 14

Input sensitivity: 0,5V

Signal to noise ratio: 90 dB

Speaker load impedance: 0,5Ω to 16Ω

Semiconductors: 46 x transistors, 22 x diodes

Size: x 483 267 430 mm x

Weight: 58 kg

McIntosh is an American hi-fi icon, founded in 1949 by Frank McIntosh in Binghamton, New York. The brand positions itself in the luxury segment of the hi-fi market, representing excellence in audio electronics for discerning audiophiles who accept no compromises on the sound quality and aesthetics of their stereo systems.

The McIntosh story begins with a technological revolution: Frank McIntosh developed the first amplifier with Unity Coupled Circuit output transformers, a solution that eliminated the distortion typical of amplifiers of the time. This innovative philosophy has guided the company for over seventy years, cementing McIntosh's reputation as synonymous with excellence in high fidelity. The American brand has always pursued sonic perfection through a rigorous engineering approach, combining advanced proprietary technologies with an unmistakable design characterized by the legendary illuminated blue glass front panels and distinctive analog metering. The McIntosh corporate philosophy is based on three fundamental pillars: constant technological innovation, uncompromising build quality, and iconic design that makes each product instantly recognizable. Each component is designed and assembled in the United States following extreme quality standards, with particular attention to material selection and artisanal manufacturing processes that guarantee superior performance and long-lasting durability.

McIntosh's distinctive technologies are at the heart of the company's research. The Unity Coupled Circuit remains one of its most important innovations, allowing for a perfectly linear frequency response and virtually zero harmonic distortion. McIntosh output transformers are entirely handcrafted using ultra-pure copper wire and select magnetic cores, ensuring optimal power transfer and natural sound coloration. McIntosh's exclusive Autoformer technology ensures perfect impedance matching for any load, allowing McIntosh amplifiers to effectively drive any type of floorstanding or bookshelf speaker. Power Guard is a proprietary system that prevents clipping by simultaneously protecting amplifiers and speakers, while Sentry Monitor technology constantly monitors operating parameters and automatically intervenes in the event of anomalies.

The McIntosh product range covers every category of high fidelity, with a precise classification ranging from digital and analog sources to the most powerful power amplifiers on the market. The MA Series transistor integrated amplifiers represent the perfect balance between power and refinement, while the MA-V and MC Series tube integrated amplifiers offer the magic of tube sound with modern reliability. McIntosh pre- and power amplifiers are the ultimate solution for reference stereo systems, allowing for a modular configuration that can be customized to meet specific needs. The McIntosh turntable category offers complete solutions with matching tonearms and cartridges, while the CD/SACD/DVD players integrate the most advanced digital-to-analog conversion technologies for music reproduction faithful to the original artistic intentions.

McIntosh product series are distinguished by specific technical features and differentiated market targets. The MA Series includes integrated amplifiers from 50 to 350 watts per channel, all equipped with Autoformer technology and compatible with any load impedance. The MC Series power amplifiers reach power up to 1200 watts per channel, ideal for driving large floorstanding speakers or complex multichannel configurations. The C Series includes reference preamplifiers with dedicated MM/MC phono stages for high-end turntables, while the MCD Series offers digital players with proprietary 32-bit converters. The McIntosh source line also includes music servers and network streamers for listening to high-resolution files, always maintaining the quality standards that characterize the American brand.

McIntosh has received numerous accolades from the international audio press, with awards from prestigious publications such as Stereophile, The Absolute Sound, Hi-Fi News, and What Hi-Fi. McIntosh amplifiers are regularly ranked among the best hi-fi products, receiving excellent ratings for sound quality, construction, and design. Expert reviewers particularly appreciate the ability of McIntosh electronics to combine exceptional technical performance with unique emotional engagement, a characteristic that distinguishes the best high-fidelity components. Comparative tests consistently highlight the superior dynamics, three-dimensional spatiality, and natural tonal quality of stereo systems based on McIntosh electronics.

McIntosh's audiophile target audience includes music enthusiasts who seek absolute sonic excellence and are willing to invest in superior components. The price range is in the premium-luxury segment, with transistor integrated amplifiers starting at €6.000 up to pre-power systems exceeding €50.000. This pricing policy reflects the craftsmanship, proprietary technologies, and ongoing research that characterize every McIntosh product, making them lasting investments for discerning audiophiles.

McIntosh's Italian distribution is entrusted to selected specialized dealers who guarantee qualified advice and professional technical assistance. After-sales service includes specialized technical support, original spare parts, and preventative maintenance to maintain optimal performance over time. The Italian distribution network ensures national coverage with dedicated showrooms where you can try McIntosh products in optimized reference configurations.