Kenwood KR-9600 (1976–1978)
Kenwood's heavyweight entry in the receiver wars - 160 watts a side, twin power supplies, and a tuner owners still argue was the best anyone ever built.
Overview
At 160 watts per channel into 8 ohms, the KR-9600 was Kenwood's most powerful monster receiver. Kenwood's own advertising billed it as a no-compromise machine, with "incredible power, advanced new circuitry and full complement of controls for unsurpassed performance". That kind of copy usually oversells, but owners are still repeating this one four decades later. The design brief was simple: put independent power supplies behind each channel so a demanding passage in one channel can't starve the other of current and smear the sound. The ad copy said it more memorably - "you don't have to starve your treble to feed your bass". The same literature confirmed the rating at 160 watts per channel minimum RMS into 8 ohms, 20 to 20,000 Hz, with the receiver priced at $750. High Fidelity (November 1976, p.152) and Audio (November 1976, p.33) both ran that same campaign.
The numbers hold up on the bench, too. The power amplifier section is rated at 160W per channel minimum RMS at 8Ω, or 200W per channel minimum RMS at 4Ω, from 20 Hz to 20,000 Hz with no more than 0.08% total harmonic distortion. Dynamic power output is quoted at 750W into 4Ω. That last figure is the interesting one. It's the transient headroom that lets a receiver drive inefficient speakers without clipping into a hard, gritty mess when the music gets dense.
What owners talk about most isn't the watts. It's the tuner. Multiple sources describe it as having "one of the best tuners ever made by anyone," and the FM section backs that up with an image rejection figure of 70 dB and IHF selectivity of 35 dB. The front end is a state-of-the-art design paired with a FET differential amplifier phono stage, and the whole thing was assembled in Japan. The AM tuner section is specified just as carefully: usable sensitivity of 10 µV (IHF), signal-to-noise ratio of 50 dB, and IF rejection of 75 dB.
Key Features
Dual Power Supplies with Independent Channel Feeds
The KR-9600's defining engineering choice is its dual power supply - separate supplies feeding each channel instead of a single shared rail. A bass-heavy transient on the left channel doesn't sag the voltage available to the right. That sag is behind a lot of the congestion people hear in lesser receivers when a mix gets busy. Kenwood marketed this heavily, and it's the feature that most clearly separates the 9600 from the rest of the line.
FET Differential Amplifier Phono Input
The phono stage uses a field-effect transistor differential amplifier, and the manual gets specific about the two phono inputs: one is set up for 250 millivolt sources and the other for 500 millivolt. Most receivers of the era gave you one phono input and called it a day. The preamp section lists a phono input sensitivity of 2.5 mV into 50 kΩ with a 76 dB signal-to-noise ratio on Phono 1, and 5.0 mV into 50 kΩ with 80 dB on Phono 2. The auxiliary and tape inputs are rated at 150 mV into 50 kΩ with a 95 dB S/N ratio. An input of 0.038 volt at the auxiliary input or 0.6 millivolt at the phono input was enough to develop a reference power output of 10 watts, according to a 1977 equipment test report.
ASO (Area of Safe Operation) Protection Circuit
Kenwood fitted the KR-9600 with an ASO protection circuit - "Area of Safe Operation" - designed to keep the output stage from destroying itself under abusive loads or shorted speaker terminals. It matters when a receiver this powerful is asked to drive 4-ohm loads at high volume. Owners still report protect-mode activation as one of the more common failure symptoms. Sometimes it's the circuit doing its job, and sometimes something upstream has drifted.
Triple Tone Controls and Two-Step Loudness
The front panel carries bass, mid, and treble controls - three bands rather than the usual two - plus a two-step loudness control. The manual lists the tone control ranges as ±10 dB at 100 Hz for bass, ±10 dB at 800 Hz for mid, and ±8 dB at 10,000 Hz for treble. There's also a low filter cutting 9 dB at 100 Hz and a high filter cutting 9 dB at 10 kHz. A midrange presence control is included, along with mic mixing and source fading, which lets you crossfade between sources. That was genuinely rare on receivers of this class.
Deviation Meter for Off-Air Recording
One of the KR-9600's more distinctive front-panel features is a deviation meter, which indicates FM broadcast frequency deviation in terms of ±75 kHz at 100% modulation. Used alongside a tape deck's VU meter, it helps prevent distortion from excessive recording levels when taping off the air. Kenwood's manual includes a conversion table for the two meters. At 100% deviation, the VU meter should read 0; at 80%, it should read −2; at 60%, −4.5; at 40%, −8; and at 20%, −14.
Three Speaker System Capability and Dual Power Meters
The KR-9600 can drive three pairs of speakers, and it carries two large power meters on the front panel. The speaker impedance range accepted is 4Ω to 16Ω. The amplifier's damping factor is rated at 55 at 8Ω, a solid figure for a receiver of this era. It means the amplifier keeps reasonable control over speaker cone motion, which gives tighter bass instead of a flabby, one-note thump.
Historical Context
The KR-9600 was released in 1976 at around $850, which works out to roughly $4,600 in today's money. It was designed to compete directly with the Pioneer SX-1250 and Marantz 2325, two of the most celebrated receivers of the period. It entered the market during what's commonly called the "receiver wars," when Japanese manufacturers were in a public arms race over power output, tuner sensitivity, and feature count. Kenwood's own literature described the KR-9600 as a product "perfected through many years of developmental efforts by an engineering team that takes great pride in its long tradition of quality high fidelity component design."
The service manual covers both the KR-9600 and the KR-9060, which suggests the two models share enough circuitry that Kenwood documented them together. The KR-9600 remained in production through 1978. During its run, the receiver was advertised in at least four major publications. High Fidelity, Audio, and HiFi-Stereo all carried the "starve your treble" campaign between late 1976 and early 1977, and Audio returned to the model in a January 1978 feature on super-powered receivers.
Collectibility & Value
On the vintage market, clean examples command real money, but not so much that hobbyists are priced out. Functioning units have sold for around $700 to $800, with one owner reporting an $850 eBay purchase described as "the average price for functioning units." A mint example bought directly from its original owner changed hands for $300. At the top end, a European listing appeared at €2,499.99, and a unit with a non-working left channel was listed at $900.
The left-channel failure is the recurring problem to watch for. Owners also report no sound, no FM tuning, and protect-mode activation as common symptoms. The good news is that the KR-9600 is well documented for repair. Recapping and upgrade procedures are widely discussed on Audiokarma, there's a YouTube repair series covering the model, and professionally restored units come up for sale periodically. Service manuals and schematics are readily available, and a full set of replacement lamps runs about $45. Original capacitors, phono grounding lugs, and power meters appear regularly as parts listings, and even a near-mint replacement knob sells for $24.99.
The KR-9600s rarely come up for sale, but when they do, they're considered a bargain relative to their reputation. Owners describe it as one of the best receivers Kenwood ever made, and the user rating on audioreview.com sits at 4.1 out of 5. The tuner section in particular keeps drawing praise, and "one of the best tuners ever made by anyone" is the phrase that keeps appearing.
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Related Models
- Kenwood 4070 (1977–1980)
- Kenwood 6050
- Kenwood 7050
- Kenwood 820S
- Kenwood 9000 G
- Marantz 2226 (1974-1976)
- Marantz 2226B (1979-1980)
- Marantz 2235 (1974-1977)
- Marantz 2238B (1978-1980)
- Marantz 2250B (1978-1980)