Sansui SP-2000 (1968–1971)

The bass hits your ribs before you hear it. This is a big speaker from the golden age of hi-fi excess.

Overview

The Sansui SP-2000 is not subtle. It stands nearly two and a half feet tall and weighs over 45 pounds per cabinet. It has a pair of massive ports that look like they belong on a subwoofer. Nobody should call it a bookshelf speaker. It is a 4-way, 6-driver system in a walnut enclosure, built to be the best Sansui could make. It was created "especially for the enthusiast who demands nothing less than the very best money can buy," and the details back that up, from the hand-oiled finish to the alnico woofer magnet that weighs nearly a kilogram.

Owners report wildly different experiences, and the difference between "transcendent" and "unlistenable" often comes down to maintenance. These speakers were developed through repeated hearing tests and lab measurements, part of Sansui's pursuit of the "absolute" in audio reproduction. In practice, they can sound dull, boomy, or clogged with midrange mush if they haven't been properly serviced. One reviewer said, "All I could hear was mid-range, loads of it, not good mid-range either." Adjust the back-panel level controls and clean the switches, and they become bearable. Recap the crossovers and treat the woofers, and they come alive. The SP-2000 is not plug-and-play. It is a restoration project.

When the capacitors are fresh, the surrounds are supple, and the pots are cleaned, owners say they "sound pretty fantastic," are "much more powerful than originally thought," and are capable of "superb" reproduction, especially with vintage Sansui electronics like the QRX-5500 or KA5700. They're described as natural with acoustic music and sensational with 1960s and 70s rock, such as Zappa, Sabbath, or The Clash. They play loud without distortion, even when driven hard by a Denon 1708. Modern electronica and radio are not their strong suit.

Specifications

Manufacturer	Sansui Electric Co., Ltd.
Product type	4-Way, 6-Speaker, Bass Reflex System, Bookshelf Type speaker system
Configuration	4-way, 6 drivers per side
Frequency characteristic	30 Hz to 20000 Hz (test chamber)
Frequency characteristic (listening room)	25 Hz ~ 20000 Hz
Max Input	70W
Impedance	8 Ω
Output sound pressure level / Sensitivity	101dB
Crossover frequency / points	1500 Hz, 5000 Hz, 10000 Hz
Network / Slope	12 dB/oct
External dimensions	Width 381 x Height 654 x Depth 323 mm
Weight	20.5kg

Key Features

The Alnico Beast

The woofer is a 12-inch (30 cm) unit with a full alnico magnet system. No cheap ferrite here. The magnet is 6 cm in diameter, weighs nearly a kilogram, and has a 140,000 maxwell magnetic circuit. That gives serious cone control and deep, articulate bass. The woofer uses a cloth-edge suspension treated with a special damping material, designed to resist fatigue and maintain linearity. Fabric ages badly, though. Owners report that treating the surrounds with a softening fluid, like the "KLH" type mentioned in repair notes, can restore lost articulation and improve bass output. Left untreated, the cones can stiffen, leading to muddy, lifeless lows.

Acoustic Staggering and Horns

The midrange uses two drivers instead of one: a 16 cm and a 12 cm cone type, arranged in what Sansui called an "acoustic staggering system." The rear of this midrange chamber is sealed, preventing interference from the woofer's backwave. The weak point is the foam surrounds on the midrange drivers. They degrade over time, and when they fail, the speaker can sound dull or hollow. Cleaning the 3-position level control switches on the back is often the first fix. Many owners report that oxidized contacts are the real culprit behind lifeless mids.

For highs there are two 5 cm horn-type drivers for the high frequency, and a dedicated 3.5 cm horn for the super high range. Horns were common in high-efficiency designs of this era, and with a sensitivity of 101dB, these speakers don't need much power to get loud. Horns can also reveal aged crossover components.

Transformer Crossover and Cabinet Craft

The crossover is a transformer-type network with a large ferrite core, designed to improve efficiency by 1.5 times. It uses a 12 dB/oct slope and electrolytic non-polar capacitors, which degrade over decades. Replacing them with modern teflon, polyester, or MKP types is common among SP-2000 owners, and one user noted "a huge improvement to clarity" after recapping. The level controls are tap-type, not volume pots, to preserve damping characteristics. You get three settings each for mid and high.

The cabinet is built from 25 mm chipboard and finished in specially selected walnut with oil. It is precision-mitered and hand-crafted. The entire enclosure is finished on all four sides, so you can place it vertically or horizontally. Inside, 25 mm of pressure-formed special wave felt damps standing waves, and a baffled, enclosed chamber with 1-inch thick corrugated fiberglass adds further acoustic control. The big ports are part of a pipe-ducted bass reflex system, engineered for extension down to 25 Hz in a real room.

Historical Context

The SP-2000 was developed through repeated hearing tests and lab measurements, blending science with subjective listening. It was "intended for audio perfectionists only." Sansui started as a transformer maker in 1947 and had by the late 1960s become a force in high-end audio. This was its most powerful loudspeaker system, the "most brilliant 4-way speaker system we've made to date," according to internal marketing. It arrived when Japanese manufacturers were pushing what affordable high-fidelity could be, in electronics and in speaker design. The SP-2000 was Sansui's answer to the demand for full-range, high-sensitivity systems that could deliver concert-hall dynamics in a living room.

Collectibility & Value

You can still find SP-2000s for as little as $100 a pair, as one owner did in 2019, or as much as €400, as recently listed on HifiShark in early 2026. Condition accounts for the gap. Common failures include degraded crossover capacitors and deteriorated foam surrounds on the midrange drivers. Both are repairable, but not trivial. Recapping the crossover is widely recommended, and refoam kits are available, including glue and instructions. Cleaning the back-panel potentiometers is often the first step to restoring clarity. One owner who did the work said, "after tinkering, I fell in love." Anyone wanting a vintage speaker that sounds great out of the box should look elsewhere.