Kenwood KA-1100 (1984–1986)
At 16.2 kg, it anchors a shelf. It is the flagship of Kenwood's integrated lineup.
Overview
The Kenwood KA-1100 is the integrated amplifier Kenwood (Trio Electronics) put at the top of its range in the early-to-mid 1980s. Introduced in 1984, this stereo integrated carries the company's engineering ambitions on a 16.2 kg frame, and it shows in nearly every specification. It was not a budget component with a big faceplate. It was built for listeners who wanted reference-grade performance without separate preamp and power amp boxes.
Most documentation gives the KA-1100 80W RMS per channel into 8Ω with both channels driven from 20Hz to 20kHz. Kenwood's own official specification sheet rates it more conservatively, at 70W+70W under the same conditions with THD of 0.005%. That gap says something about how manufacturers measured versus how reviewers and databases recorded. The continuous power figure under DIN standards is 120W+120W into 4Ω at 1kHz with the same 0.005% distortion, which suggests the amplifier has real current reserves.
Frequency response runs from 5Hz to 300kHz. That looks absurd until you remember this was the era of wide-bandwidth amplifier design, where the goal was to keep the audio path transparent well beyond the audible range. At 1W output, the response from 20Hz to 20kHz is rated at 0 to ±0.1dB, essentially flat. Total harmonic distortion at rated power is 0.005%, and the IHF A-weighted signal-to-noise ratio is rated at 120dB. Many modern amplifiers would have trouble matching those numbers.
Key Features
DC Twin Power Supply Design
The output stage uses a DC twin power supply design, which means the amplifier doesn't put coupling capacitors in the signal path. That avoids the phase shifts and low-frequency rolloff capacitor-coupled designs introduce, and it is part of how Kenwood reached the 5Hz to 300kHz response. The power amplifier section is built around a dual power supply topology. Kenwood also gave the preamp stage its own separate power transformer, a detail usually reserved for separates, not integrated amps. This keeps the sensitive preamp circuitry away from the higher-current demands of the output stage.
4 × 12,000µF Filter Capacitors
Backing up that twin power supply are four 12,000µF filter capacitors, 48,000µF of total reservoir capacitance. That is a lot of energy storage for an integrated amplifier, and it gives the dynamic headroom that keeps the KA-1100 from sagging on transients. The 475W power consumption figure shows what the amplifier can draw when pushed.
Discrete Preamp and Tone Control Section
The preamp section is described as a "linear" design with a discrete pre-drive stage, and no off-the-shelf op-amps in the critical path. The tone control section has bass, mid, and treble controls, so three bands of adjustment instead of the usual two. There is also a record selector with a detent switch for tape recording. It lets you route one source to the tape outputs while listening to another, a feature that was becoming rarer as the 1980s wore on and manufacturers simplified their control layouts.
Phono Stage for Both MM and MC Cartridges
The KA-1100 has a phono stage that handles both moving magnet and moving coil cartridges, switchable from the front panel. For MM cartridges, input sensitivity is 2.5mV into 47kΩ with an overload level greater than 150mV RMS at 1kHz. For MC cartridges, sensitivity is 100µV into 100Ω with overload greater than 6mV RMS. The RIAA equalization is accurate to ±0.2dB from 20Hz to 20kHz. Signal-to-noise is rated at 90dB for MM and 70dB for MC, both A-weighted.
Flexible Inputs and Outputs
The rear panel carries inputs for Phono MC, Phono MM, Tuner, Aux, Tape 1, and Tape 2, with line-level inputs (Tuner/Aux/Tape) rated at 150mV into 47kΩ. The power amp input accepts 1V into 48kΩ, and there is a pre-out for bi-amping or an external processor. Speaker impedance is rated for 4Ω to 16Ω, with a single pair of speaker terminals, and a headphone jack sits on the front. The unit runs on AC 120V/230V/240V, switchable, at 50/60Hz, which reflects Kenwood's export markets.
Historical Context
The KA-1100 was produced from 1984 to 1986. It was listed in the "Kenwood Series 20" lineup alongside the KA-1100G, KA-990, KA-880, KA-660, KA-550, and KA-330. The KA-1100G is a separate variant with a gold-plated front panel. It is not the same amplifier, despite the similar name, and shouldn't be confused with the standard KA-1100.
As the flagship of Kenwood's integrated amplifier range during this period, the KA-1100 carried the company's reputation. HiFI-Stereo (November 1978, p.9) was already tracking Kenwood's amplifier output levels in the late 1970s. By 1984 the company had refined its approach into a fully discrete, dual-transformer, wide-bandwidth integrated amp with a phono stage good enough to satisfy cartridge collectors. The 16.2 kg weight comes from two transformers, four large filter capacitors, and chassis bracing that keeps microphonic vibrations away from the circuitry.
Collectors today note that the KA-1100 doesn't show up on the used market as often as Kenwood's more numerous mid-range models. It had a shorter production run and a more demanding buyer, and the units that survive tend to stay in systems rather than circulating through estate sales. The research documents no owner complaints, though that may simply reflect that buyers knew what they were doing and maintained the amplifier accordingly.
For a period-correct 1980s separates system, the KA-1100 is the integrated approach at its most ambitious, a single box that gives up very little to the separates it was designed to replace.
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