Conrad Johnson Synthesis LM210

Floorstanding Speakers


In good condition. Does have a few holes in grille cloth, but these are pretty cool looking with out the grilles! In Oak finish.

Original box and packing are not included. LOCAL SALE ONLY! Circa 1988.

SYNTHESIS loudspeaker systems were designed and manufactured by a subsidiary of Conrad Johnson, a well-known manufacturer of high end amplifiers and preamplifiers.

The compact and attractively styled Synthesis LM210, which looks like a miniature version of the flagship Synthesis Reference System, is the smallest and least expensive speaker in the line. A two-way floor standing system, it is only 10 1/2 inches square and 33 1/2 inches tall.

Its 6 1/2 inch polypropylene cone bass/midrange driver operates in a ported enclosure with twin vents on the front of the cabinet. All internal wiring is soldered (no clip connectors are used). The system crosses over at 1,500 Hz to a 1 inch soft dome driver, which, like the woofer, is made in Denmark. The crossover network uses high quality polypropylene capacitors and air core inductors. The enclosure's venting alignment and the crossover characteristics are designed to give the system a Bessel-type response with linear phase shift through the crossover region. The crossover slope is initially a gradual 6 dB per octave, increasing eventually to 12 dB per octave. The 1,500 Hz crossover frequency was chosen to minimize the audible breakup effects that can occur even in 6 -inch drivers between 1,500 and 2,500 Hz.

The cabinet is constructed of 3/4 inch Medite (a type of particle board) veneered with oak on all sides and with 1 1/4 inch solid oak along the edges. All the corners and edges are rounded. The drivers and ports are on the upper section of the front panel, which is angled backward about 20 degrees for time alignment of the drivers and reduced internal low frequency standing waves. Internal padding with 1 1/2 inch thick damping material reduces high frequency standing waves. A black cloth grille snaps onto the front panel of the speaker.

The speakers are supplied with spikes that can be screwed into threaded inserts in their bases to make a more positive contact with the floor. Each speaker weighs about 32 pounds.

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