Nakamichi 580M (1978–1982)

A 2-head deck that weighed 8.3 kg and carried its own 400 Hz calibration tone. It sat in the middle of Nakamichi's second-generation line and was built like it belonged at the top.

Overview

The 580M weighs 8.3 kg. That's a lot of mass for a two-head cassette deck, and it isn't dead weight. The chassis is built from aluminum and resin molded parts to damp resonance, and the flywheels are machined from solid iron bars and balanced both statically and dynamically. Nakamichi did not build the middle of its line like the middle of anyone else's line.

The 580M is a 2-head stereo cassette deck, produced from 1978 to 1982. It sat in the middle of Nakamichi's second-generation lineup, with the junior 400 series below and the senior 600 series above. The company's own advertising in Audio (June 1980, p.133) and HiFi-Stereo (June 1980, p.39) pitched the whole 580 Series as a line for the serious recordist that "rises above mediocrity." The 580M was placed at the economical end of the family, and the 582 was the universally acclaimed flagship of the group. So the 580M was the entry point to a serious series, not a budget machine wearing a nice badge. The fact sheet puts it bluntly: the 580M stood apart as the 2-head workhorse with flagship DNA.

The price tells you the intent. At ¥115,000 around 1980, this wasn't a casual purchase. In the U.S. it was $690, a figure Modern Recording (February 1980, p.39) reported alongside the 480 at $495, noting both as two-head recorders with improved transports. You got two heads, an improved transport, metal tape capability, and a price tag that said Nakamichi expected real recording work out of the machine.

On tape, the 580M delivers a frequency characteristic of 20 Hz to 20 kHz ±3 dB at -20 dB, with wow and flutter rated at 0.04% or less Wrms and 0.08% or less Wpeak. Flutter is the number that matters most on a cassette deck. It's the difference between piano that holds pitch and piano that wobbles. The 580M gets there with a frequency-distributed double capstan system that Nakamichi called a closed-loop double capstan, paired with a PLL servo drive motor that corrects speed deviations in real time. On a two-head machine, where record and playback share one element, that transport precision carries more of the load than it would on a three-head deck.

Key Features

The RP-9E Head and E-8L Double-Gap Erase Head

The 580M uses a newly developed RP-9E recording/playback head. On a two-head deck this one element does both jobs, recording and playback. Paired with it is an E-8L double-gap erase head. It's the less glamorous half, but thorough erasure is what lets you reuse a tape without ghosting from the previous recording. Nakamichi rated erasure at 60 dB or more at 1 kHz at saturation level on ZX tape.

Closed-Loop Double Capstan Transport with PLL Servo Motor

The transport is where the 580M separates itself from most two-head decks of its era. Nakamichi used a frequency-distributed double capstan arrangement, which they called a closed-loop double capstan, so the tape is held under tension at both ends of the head path instead of being pulled past the head by a single capstan. The result is exceptional tape-to-head contact and speed stability, and it's why the wow and flutter figures land where they do. A PLL servo motor drives it all and continuously corrects speed deviations rather than relying on a fixed motor speed. The flywheels are machined from solid iron bars and balanced both statically and dynamically to eliminate vibration.

Double-NF Equalizers and a DC Recording Amplifier

The signal path got the same attention as the mechanics. The recording and playback equalizers use Double-NF (Negative Feedback) circuits, which help hold frequency response flat across all three tape types. More interesting is the DC recording amplifier, which eliminates the coupling capacitors between the circuit and the head. Capacitors in that position can color the sound, particularly at low frequencies. Removing them means cleaner, more direct control over the magnetic flux written to the tape, which helps when you're pushing metal tape toward its limits.

ZX Metal Bias Position and EX/SX/ZX Tape Switching

The front panel carries a tape selector with three positions: EX for normal bias, SX for high bias, and ZX for metal bias, with metal capability conforming to IEC Type IV. The ZX position is the one that dates the deck. The 580M was one of the first in its class to include a dedicated metal bias setting, at a time when Type IV tape was still establishing itself. An Eq. switch toggles between the 70 µs and 120 µs equalization curves, so the deck can be matched to the tape in the well instead of forcing one compromise setting across all three types.

47 dB Peak Level Meter and Built-In 400 Hz Test Tone

Metering on the 580M is handled by a 47 dB full-range peak level meter — a wider window than most two-head decks offered, which matters because you're setting levels by eye and the meter is your only instrument. To calibrate the 0 dB reference, the deck carries its own built-in 400 Hz test tone, so you don't need external test gear to get the levels honest. Record calibration controls sit on the front panel alongside the meter, and the manual's adjustment section lays out the speed procedure in detail: a 3 kHz speed and wow/flutter tape played back while a frequency counter reads the output, with the tape speed adjustment volume on the capstan motor trimmed until the counter reads 3,000 Hz.

C-MOS Logic Control and Soft-Touch Operation

Operation is C-MOS IC logic control with soft-touch buttons - no clunky solenoids, no mechanical latching to wear out. The manual explains why C-MOS was chosen: the complementary P-channel and N-channel MOS FETs draw nearly zero current in a steady state, give a large noise margin, present very high input impedance, and tolerate a wide operating voltage range. In practice, that's a transport that runs cool and switches cleanly. The mechanism itself is cam-controlled, driven by a control motor that moves the cam until the voltage difference between the selected function and its reference reaches zero. That keeps each mode properly engaged without relying on mechanical detents. When the tape ends, a high-speed auto-shutoff mechanism stops it in just 0.4 seconds.

Timer Recording, Queuing, and the Service-Friendly Chassis

The 580M supports timer recording and playback, which was rare in mid-tier decks at the time and let the machine run unattended with an outboard timer. An easy queuing function makes track transitions smoother, which is useful when you're assembling a tape rather than just dubbing one. The chassis shares its design with the rest of the 500-series: a wide slanted front panel, with service-friendly adjustment holes under the cassette door so the calibration trims can be reached without disassembly. The rear panel carries a voltage selector for other versions of the 580M, switching between 120 V and 220-240 V at the customer's discretion. Nakamichi was clearly shipping this deck into multiple markets.

Historical Context

The 580M arrived in 1978-1979 as part of a coordinated launch that included the junior 400 series and the senior 600 series. Nakamichi was building a complete lineup here. The 500-series sat in the middle of that structure, and the original family included four models: the 580, 580M, 581, and 582. The 581 was later described as the budget model, and the 582 became the popular 3-head variant. The 580M stood apart as the 2-head workhorse with flagship DNA, for someone who wanted serious transport engineering and metal tape capability without stepping up to a three-head machine.

Production ran from 1978 to 1982, though the fact sheet carries a note of caution. The arrival window of 1978-1979 and the production span of 1978-1982 may describe different things, and the end date isn't independently confirmed beyond the range. Treat the later years as approximate.

Collectibility & Value

The 580M hasn't become a stratospheric collector's item the way the Dragon has, but it's far from forgotten. Recent listings show the deck selling for €180 (as of June 29, 2025) and BGN 590 (as of July 2, 2025), which is modest money for this much transport engineering. Owners report units that sat in storage for over 20 years firing up and working beautifully, and one user on StereoNET put it simply: "The sound quality is phenomenal."

Comprehensive repair data and common failure modes aren't well documented in the available sources. The service manual exists and suggests maintenance is feasible for the technically inclined, but there's no established playbook for what tends to go wrong. Spare parts availability beyond what turns up in eBay listings isn't documented either. That makes a 580M a reasonable buy for someone comfortable with a service manual and a frequency counter, and a riskier one for someone who wants a plug-and-play deck. Given the precision of the transport, a cleaning and alignment before heavy use is the sensible first move.