McIntosh MC2300

McIntosh MC2300: used price, history, and what to check before you buy

By HiFi Registry Staff · Published November 1, 2026

In short: The MC2300 is the 300 watt per channel solid-state amplifier McIntosh built from 1971 to 1980, the one the Grateful Dead stacked 48 deep in the 1974 Wall of Sound. It weighs 128 pounds, listed at $1,799 when discontinued, and sells used for roughly $2,500 to $4,500 as a working unrestored example and $4,000 to $7,500 at dealers serviced or rebuilt. Documented Grateful Dead units are a separate market, and a seller's story is not provenance. HiFi Registry's recorded sales for this model are in the table further down the page. Prices checked November 1, 2026.

Versions and years

McIntosh made one MC2300 for nine years, with one running change worth knowing about and a handful of special-order variants that rarely surface.

Wikipedia, drawing on Roger Russell's McIntosh history, puts total production at 4,545 units.

Where the sources disagree: McIntosh's legacy catalog dates the preceding MC2105 to 1967 to 1978 and calls it the company's first solid-state amplifier, while Wikipedia gives 1969 to 1977. Either way the MC2300 was not McIntosh's first transistor amp, but it was the first at this power, triple the MC2105's 105 watts. McIntosh's Wall of Sound article says the system used 48 MC2300s; crew member Steve Parish, quoted by McIntosh and What Hi-Fi?, says the band bought 70. The 48 is the count in the PA, the 70 the band's purchase.

Specs that matter

All figures from McIntosh's 1971 owner's manual unless noted.

• 300 watts per channel, both channels driven, into 0.5, 1, 2, 4, 8 or 16 ohms, each on its own terminal. 600 watts mono into 0.25 to 8 ohms with the outputs strapped in parallel.
• 0.25 percent maximum distortion from 250 milliwatts to full power, 20 Hz to 20 kHz. Noise 90 dB below rated output. Damping factor 14 at the 8 ohm tap.
• Output autoformers on each channel. The meters read at the autoformer primary, so they show true power on any tap.
• Two peak-locking meters with a four-position range switch (off, 0, minus 10, minus 20 dB).
• Sentry Monitor current limiting. Twelve output transistors per channel, 46 silicon transistors in all.
• Two rear fans: thermostatic two-speed from serial 2Y053, always on before that.
• Input sensitivity 0.5 V, 200,000 ohm input impedance, left and right/mono gain controls. Unbalanced inputs only.
• 1,400 watts from the wall at full output. McIntosh says to use a wall outlet on a 15 amp circuit, never a preamp's switched outlet.
• 128 lb net, 143 lb in the carton. Front panel 19 by 10.5 inches, chassis 17 inches deep. Anodized gold and black panel, standard 19 inch rack mount with removable side rails.
• Original price: $1,799 at the end of production in 1980, per Wikipedia and the "last retail" figure dealers quote. No source this guide could reach gives the 1971 introductory price.
• Warranty: none. The original three year factory service contract covered the first purchaser only, could not be transferred, and expired decades ago. Dealers may add their own; one Audiogon dealer offered 90 days.

Used prices by condition

HiFi Registry's recorded sales for the MC2300 are in the table below this guide. What the wider market shows, as of this writing:

• Working, unrestored, private sale: HifiShark's history shows asks from about $1,250 on Reverb in 2024 to $4,400 from a US dealer in 2023, with European private asks of 2,500 to 3,900 euros. An owner discussion captured by Equipboard puts $2,400 as fair for a good unserviced example. At this money, assume every electrolytic capacitor is original.
• Serviced, not rebuilt: Audio Exchange sold a "fully serviced and tested" unit at $4,000 with freight included. The Music Room has sold a cosmetic 7 example as certified pre-owned with no service history recorded; the price is not public.
• Rebuilt driver boards and output stage: Salon One Audio asked $7,500 in August 2026 for a cosmetic 7 unit with all output transistors replaced by a McIntosh-authorized shop. SkyFi and Aural HiFi have sold fully restored MC2300s without publishing the figures. Expect the top of the range here.
• Grateful Dead provenance: Seven Wall of Sound MC2300s sold at Sotheby's in October 2021 for $25,200 to $94,500 each, and Jerry Garcia's "Budman" sold for $378,000 against a $5,000 to $7,000 estimate, then again at Christie's in March 2026 for $381,000. A Reverb seller has since asked $35,000 for an amp with stickers and an unverified Watkins Glen story. Auction-house documentation moved those prices; without it, a Dead story is worth nothing.

Treat any blended MC2300 average with care. A $1,250 project amp and a $94,500 Sotheby's lot share a model number and nothing else.

What to check before buying

1. Fans. Turn it on cold. Both fans spinning immediately means an early unit, which is normal. On a later unit, fans that never come on after an hour of hard use point to the thermostat circuit. A replacement fan should be the McIntosh part.
2. Driver boards. The known weak point. McIntosh issued a service bulletin covering the MC2100, MC2105 and MC2300 driver cards, and SkyFi's rebuild follows it: new electrolytics, matched differential input transistors, new driver transistors and heat sinks. Ask whether this has been done. If not, price it in.
3. Output transistors. Twelve per channel. Replaced outputs are not a negative if a McIntosh-authorized shop did the work; ask for the ticket.
4. Power supply capacitors. Aural HiFi's restoration rebuilt the high-voltage filter can and replaced the filter capacitors. A full recap kit for every board is about $295 in parts, so the real cost of a rebuild is the technician's time.
5. Mono strapping. The manual warns in bold that stereo mode with the outputs strapped in parallel causes high circulating currents and overheating. Touring units were often strapped for mono; Salon One's was. Confirm the rear mode switch matches the wiring and works. SkyFi replaced one.
6. Mains breaker. The 20 amp breaker on the back can fail; SkyFi replaced a broken one.
7. Meters and lamps. Both meters should swing on music and sit still at idle. Incandescent lamps are a consumable; LED conversions are common. Ask whether the meters were calibrated after service.
8. Cosmetics. The gold anodized faceplate is hard to refinish; look for solvent marks and clear-coat discoloration under direct light. Rusted top covers and faded stencils are common on road units.
9. Shipping. 128 pounds, two people, freight only. SkyFi charges a flat $400 to the lower 48; Audio Exchange palletizes.

Who it is for, and what else to consider

The MC2300 is for someone who wants 1970s McIntosh at full scale: the meters, the autoformers, current for any speaker, and a direct line to the most famous PA in rock history. It draws 160 watts at idle, needs 2 inches of side clearance and 5 at the rear, and will not sit on a normal shelf.

Within McIntosh, the MC2105 gives the same era and look at 105 watts in a far lighter chassis, and the MC2205 (1975 to 1981) and MC2200 (1976 to 1982) slotted in beneath it later in the decade. The MC2500, 500 watts per channel, replaced it in 1980 and ran to 1990; the MC2255 (1981 to 1986) is the next-generation stereo amp from the same catalog. If the history matters less than the watts, a used MC462 is the modern comparison at rebuilt-MC2300 dealer money.

Frequently asked questions

What is a used McIntosh MC2300 worth? Roughly $2,500 to $4,500 for a working unrestored amp, $4,000 to $7,500 at dealers for serviced or rebuilt examples, and far more only with documented Grateful Dead provenance. See the condition notes above and the recorded sales table for what has actually changed hands.

How many MC2300s were in the Grateful Dead's Wall of Sound? McIntosh says 48 powered the system, which ran from March to October 1974. The band bought 70 in total, according to crew member Steve Parish, and members kept using them on stage afterward.

How much power does the MC2300 really make? McIntosh rated it at 300 watts per channel minimum, both channels driven, 20 Hz to 20 kHz at 0.25 percent distortion, into any tap from 0.5 to 16 ohms. Dealers who bench test them report they meet or exceed that.

Can the MC2300 run as a mono amp? Yes. Set the rear mode switch to mono and strap the outputs in parallel for 600 watts into 0.25 to 8 ohms. Never run it strapped with the switch in stereo.

Why do the fans run all the time on my MC2300? Early units ran the fans whenever the amp was on. From serial 2Y053 they became thermostatic and two speed. Either is correct for its vintage.

Does any warranty apply to an MC2300? No. The original three year factory service contract was non-transferable and has long expired. Some dealers add a short warranty of their own on a serviced unit.

Related

• A Buyer's Guide to McIntosh
• McIntosh comps: MC2105, MC2500, MC2205, MC2255, C28
• Live McIntosh listings on HiFi Registry
• Sell your MC2300 on HiFi Registry, $25 flat, no commission

Written by HiFi Registry Staff. Not a review: HiFi Registry has not owned or auditioned this unit unless the text says so. Price ranges describe open-market sales and dealer asking prices observed on the review date and are not offers to buy or sell. How we research these guides