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Infinity Reference Standard RS II-B Vintage Ribbon Speakers with LF EQ, Near Perfect

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Pickup currently unavailable at SkyFi 479

Infinity Reference Standard Rs Ii-B Vintage Ribbon Speakers With Lf Eq Near Perfect

Infinity Reference Standard RS II-B Vintage Ribbon Speakers with LF EQ, Near Perfect

SkyFi 479

Pickup currently unavailable

479 South Broad Street
Glen Rock NJ 07452
United States


These well regarded vintage Infinity speakers have one of the most unique driver configurations out there. There are 3 ribbon midrange drivers radiating front and back, two forward tweeters and one rear facing tweeter, and 2 poly woofers.

While these are not the most accurate speakers ever made, many connoisseurs love them for their musicality and ability to engage the listener. It is a full range speaker and is capable of deep bass. The controls on the back let you dial in all 3 frequency ranges to match your room listening position and taste.

These beauties include a rare matching bass EQ, which as the manual states, must be used with this model to achieve a flat frequency response and to dial in the bass precisely. I have seen these speakers sold many times without the proper bass EQ, as many folks seem to misplace it during a move or as the speakers trade owners.

Condition on these speakers is spectacular without a single noticeable dent or deep scratch. Quite the achievement for a speaker this size and age. Even the grills are perfect! I suspect this is because the original owner had them since new, and never moved them from their original installation location in his NYC apartment where we retrieved them.

They were powered with a McIntosh MC-275 which provided ample volume and power, and is a great match for these fairly easy to drive speakers.

Link to manual:


• Drivers: For each channel: Two 10-inch polypropylene woofers. Three EMIT tweeters, one facing rearward, and three EMIM midrange drivers

• Frequency Response: 29 to 32,000 Hz ±2 dB Suggested for use with amplifiers or receivers of: 60 through 250 watts per channel RMS

• Crossover Frequencies: 150Hz, 800 Hz, 4,000 Hz, and 8,000 Hz • Nominal Impedance: 4 ohms

• Finish: Hand rubbed oak veneers and solids • Dimensions: 48 inches x 22 3/4 wide x 18 deep (160.6 cm x 66.25 wide x 36.25)

• Shipping Weight: 200 lbs per system

• Introduced in 1984

• Discontinued in 1987

• Original Retail Price: 2,700.00 S

EMIM Mid Rev. B/C .902...0012B
10” WFR Poly Clear .902...2279A (Substitute only)
EMIT Twt Sq/Blk .902...5086 Diaph Assy. Kit Tweeter .751...3722
EMIT Diaph. Assy. Midrange .751...3806



Original Box








Physical Condition


Working Condition


SKU: Infinity RS-IIB