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Vintage 1970s Bozak LS-200A “Listeners Series” Bookshelf Loudspeakers Speake - $120 (Sterling)

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Item: Vintage 1970s Bozak LS-200A “Listeners Series” Bookshelf Loudspeakers Speaker Pair

Price: $120 for the pair.

Seller Notes: Some scratches and scuffs throughout and laminate/veneer issues. All of the speakers / crossovers appear to be original. One of the tweeters doesn’t work so a new one will need to be sourced. (see photos) The pair sounds amazingly good for its age and the one tweeter being out . The subwoofers are pretty unique as the cones are made out of metal, some paint on the cones is flaking and peeling in areas.

Specs and review from hifi-classic:

Bozak's LS-200A, one of the company’s “Listener Series” loudspeakers, is a two-way bookshelf system with an 8-inch woofer in a vented enclosure and a 1-inch dome tweeter. The flush-mounted drivers are closely spaced in the lower half of the speaker board, with the woofer port located at the upper-right corner. The speaker’s binding-post connectors are recessed into the rear of the cabinet. There are no external controls.

The cabinet, finished in walnut-grain vinyl, has a brown grille retained by plastic snaps at its corners. Removing the grille reveals the attractively finished speaker board, whose surface matches the other cabinet faces. The cabinet is 20 inches high, 11-1/2 inches wide, and 9-1/2 inches deep, and the system weighs 27-3/4 pounds. Price: $358 per pair.

Laboratory Measurements

The LS-200A’s axial frequency response, measured at a 1-meter distance with our IQS FFT signal analyzer, was flat within ±2 dB from 180 to 7,000 Hz; it dipped to a minimum of — 4 dB at 8,500 Hz and returned to the midrange level at 15,000 Hz. The low-frequency limit of this measurement was set by the operating parameters of our test equipment. The woofer performance was measured separately, at both the cone and port, with close micro-phone spacing using one of the low-frequency measurement modes of the analyzer. Combining the results, with corrections for the respective output areas, we obtained a woofer-response curve whose maximum was at 55 Hz, sloping down gently at higher frequencies and more steeply at the lower frequencies.

We would estimate that the LS-200A’s crossover frequency is in the range of 1,500 to 2,000 Hz, although there was no sign of it in the response curve. In measuring the woofer response, however, we found a sharp dip at 800 Hz, which was also discernible in the overall system-response measurement at 1 meter. There was also a large, narrow-band peak in the port output at 350 Hz, which caused a distinct glitch at that frequency in the combined woofer response. Overall, the system response of the LS-200A was within approximately ± 4 dB from 50 Hz or below to about 18,000 Hz. All the essential features of our frequency-response curve matched those of the curves supplied by Bozak. For the most part, the speaker’s group delay remained within a ± 0.4-millisecond range, with occasional deviations to 1 millisecond between 1,000 and 9,000 Hz.

The speaker’s impedance was a minimum of 6 ohms around 200 Hz and reached its maximum of 20 ohms at 26 and 78 Hz (18 ohms at 2,000 Hz). Its sensitivity was 89 dB sound-pressure level (SPL) at 1 meter for a 2.83-volt input. The woofer distortion was measured with a constant input of 3.2 volts, equivalent to a 90-dB midrange sound-pressure level. The distortion at the cone was only about 1 per cent from 100 to 80 Hz, rising to 2.4 per cent at 60 Hz and 10 per cent at 50 Hz. The effective crossover between the woofer cone and port took place at about 75 Hz, but the measured distortion at the port was unusually high in the frequency range where the port output is effective. Since this was not apparent in the sound of the speaker, we gave little weight to the port distortion measurements in our overall evaluation of the system.

Comment

The sound of the Bozak LS-200A was smooth and well balanced, with a slight tendency toward warmth. We listened to the speakers placed against a wall (as in a typical bookshelf installation) and also free-standing on pedestals several feet from a wall. The sound quality—the octave-to-octave balance, as distinguished from imaging properties—was not significantly affected by these two very different installations.

We found the Bozak LS-200A speakers to be able and competitive performers in their price range. Their sound was always pleasant and free of irritating qualities. If they do not have any obviously novel design features, they are also happily free of significant faults, as well as being quite attractively finished.


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