Kenwood LS-770-MKII (1978–1980)

93 dB efficiency, a coaxial bullet tweeter, and a cult following in Japan - this is the speaker that made Kenwood's name in high-end audio.

Overview

Pull one out of a forgotten cabinet in an Osaka apartment and the first thing you notice is the smell. A faint trace of aged wood glue and oxidized copper, like a book opened after decades. Then you see the LS-770-MKII. The 10-inch coaxial driver stares back like a single eye, with the horn-loaded bullet tweeter centered in the paper cone. It's a late-'70s Japanese design through and through. This wasn't Kenwood's first speaker, but it was the one that told the world they weren't just making radios and tuners anymore.

It has 93 dB sensitivity, so low-powered amps drive it easily. Single-ended triodes, humble solid-state receivers, even modest transistor amps from the era - none of them break a sweat. The efficiency comes from a large-diameter paper cone with a long voice coil, paired with a passive radiator of the same size to extend bass response without port noise. The closed-box design keeps transient response tight. The coaxial layout, where the tweeter fires from the center of the woofer, aims for time-aligned sound and a very precise stereo image.

In practice, these speakers deliver a midrange that feels very present, especially with vocals and acoustic instruments. There's a warmth to the delivery, not colored exactly, but generous. The treble, thanks to the horn-loaded tweeter, has bite without being harsh, though some owners report it can get a little intense if the room is too reflective. Bass is quick and articulate, but don't expect earth-shaking depth. The passive radiator helps, but below 40 Hz the energy drops off, so deep organ pedals or synth drones will want a sub or a different speaker.

It was positioned as Kenwood's flagship during its production run, sitting above the LS-55 and LS-66 models, and it showed in the build. The cabinets are thick MDF (for the time, nearly overkill), finished in a durable black laminate that resists scratches better than veneer. The grilles are metal, not fabric, with a perforated pattern that looks more industrial than decorative. These aren't pretty speakers in the traditional sense. They look like tools built for listening.

Specifications

Key Features

Coaxial Driver with Horn-Loaded Tweeter

The coaxial driver is the center of the design, a philosophy Kenwood inherited from its earlier Trio branding (the company rebranded fully to Kenwood in 1986, but the LS-770-MKII predates that). With the tweeter mounted directly in the center of the woofer, Kenwood got a point-source radiation pattern that minimizes phase differences between high and low frequencies. The result is a cohesive soundstage, especially when seated directly on-axis. The bullet-shaped tweeter is horn-loaded, which boosts efficiency and directivity. The horn is profiled to control dispersion, reducing early reflections and improving clarity in untreated rooms. The trade-off is a slightly forward treble character that can feel aggressive with bright recordings or poor placement.

Passive Radiator for Extended Bass

Instead of a port, Kenwood used a 10-inch passive radiator, essentially a second woofer without a motor, to tune the bass response. This avoids port turbulence and chuffing, common in ported designs at high volumes, and allows for tighter transient response. The radiator moves in opposition to the active driver, reinforcing bass output around 40 Hz. It's not a subwoofer replacement, but in a nearfield setup or small room it delivers a surprising sense of weight. The downside is that the radiator's suspension can degrade over time, especially if the speakers were stored in humid conditions. A stiff or seized radiator will kill the low-end response, so check it first when buying used.

Industrial-Grade Cabinet Construction

The LS-770-MKII uses thick MDF panels with internal bracing, finished in a black laminate that was both modern and practical for the era. Unlike wood veneer, which can chip and fade, this surface resists scratches and cleaning solvents. The front baffle is especially thick, minimizing resonance, and the entire cabinet feels inert when tapped. That means reduced coloration, with no boxy sound, just clean driver output. The metal grilles are heavy but easy to remove, and they don't affect the frequency response much, though some purists prefer them off for a more open sound.

Historical Context

The LS-770-MKII arrived in the late 1970s, when Japanese audio companies - Kenwood, Pioneer, Sony, Yamaha - were racing to prove they could rival Western high-end brands like Quad, Tannoy, and AR. Kenwood, still transitioning from its Trio roots, needed a halo product. The LS-770-MKII was that product: ambitious, technically sophisticated, and priced accordingly. It competed directly with the Yamaha NS-1000M and the Pioneer S-7EX, both of which also used exotic materials and complex crossovers. Where those speakers leaned into multi-driver arrays and exotic cones, Kenwood bet on coherence - fewer drivers, better integration.

The coaxial design wasn't new - Tannoy had been doing it for decades - but Kenwood's execution, with its horn-loaded tweeter and passive radiator, was fresh. It also reflected a shift in listening habits. As home hi-fi moved from console radios to separates, listeners wanted speakers that could disappear sonically, creating a "you are there" illusion. The LS-770-MKII, with its focused imaging, delivered that, especially in the Japanese market, where small listening rooms favored compact, efficient designs.

It didn't last long. By 1980, Kenwood had moved on to the LS-900 series, and the LS-770-MKII faded into obscurity outside Japan. In the decades since, it has gained a cult following among vintage audio enthusiasts who appreciate its efficiency, build quality, and sonic character.

Collectibility & Value

Today the LS-770-MKII trades in a narrow market. Prices vary widely with condition, with fully restored pairs commanding $400-$700 in North America and Europe. In Japan, where they're more common, working pairs might go for ¥30,000-¥50,000 ($200-$350). "Working" is the key word. These speakers are nearly 45 years old, and several components are prone to failure.

The most common issue is the crossover capacitors. The non-polarized electrolytics used in the filter network dry out over time, leading to treble loss or complete tweeter failure. Replacing them isn't hard, and any competent technician can do it, but it's essential. Equally critical is the condition of the woofer surrounds. The paper cones are durable, but the foam or rubber surrounds can disintegrate, especially if the speakers were exposed to sunlight or moisture. Inspect them visually and look for crumbling material around the edge of the cone.

The passive radiator is another weak point. If it's not moving freely, the bass will be thin. Sometimes it's just stiff from age and can be revived with careful coaxing. Other times the surround needs replacement. The drivers themselves are sturdy, but the horn tweeter's diaphragm can tear if overdriven, so avoid cranking them with modern high-power amps.

For buyers, assume the crossovers need recapping. Budget $100-$150 for the work if you're not doing it yourself. Check the grilles for dents, the cabinets for warping, and the binding posts for corrosion. Reconed drivers or replaced cabinets drop the value significantly.

It's not a neutral monitor like a modern Harbeth, nor a bass monster like a JBL. It sounds alive, especially with jazz, rock, and acoustic recordings from its era. A modest tube amp or a vintage Kenwood receiver suits it.

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