Infinity Beta

Documentation on the Infinity Beta is thin, and what survives comes almost entirely from a single Czech audio database. The record shows a straightforward 2-way bass reflex loudspeaker: a 250 mm woofer paired with a 25 mm tweeter, rated for 30–150 W of amplifier power, with a frequency response of 38–45,000 Hz (±3 dB) and a 4 Ω impedance. The cabinet measures 590 × 330 × 270 mm and weighs 14 kg.

One complication in the historical record: the Library of Congress catalogs an "Infinity Beta" — but that entry is for a music album, not the speaker. It's a different thing entirely and shouldn't be confused with the loudspeaker.

The only user commentary found comes from a forum thread on Tubular Bells discussion boards, where one owner reported pairing an Infinity Beta with a newer Denon amplifier and finding the sound fine. That's the extent of the reception record — no production years, no original pricing, and no details on crossover design or cabinet construction have surfaced. Period advertising positioned the Infinity Reference Standard Beta as a statement product for purists, with the system costing under $11,000, and noted that the IRS Gamma and IRS Delta were two-speaker versions of the Beta (HiFI-Stereo, May 1988, p.3). A new lower-midrange driver, the Large-EMIM, was created for the Beta, a push-pull planar driver reproducing frequencies from 70 to 700 Hz (Audio, January 1988, p.44).

Known specs: