Cerwin-Vega 250 SE Cerwin-Vega, best known for musical-instrument and sound-reinforcement speakers, recently introduced a line of five speaker systems for the home market. Called the Select Edition Series, the speakers combine the smooth response and wide dispersion of home hi-fi speaker designs with the high power-handling capability and high sensitivity of professional models. The Model 250SE, at the midpoint of the Select Edition 200 Series, is a floor-standing three-way system based on a 10-inch woofer operating in a vented enclosure (the vent opening is in the rear of the cabinet).

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The nominal system impedance is 6 ohms, and the rated frequency response is 32 to 20,000 Hz ± 3 dB. The system's sensitivity is specified as 95 dB sound-pressure level (SPL) at 1 meter with a 1-watt input. At 550 Hz, there is a 12-dB-per-octave crossover to a 6-inch cone midrange driver, and at 3,500 Hz there is a similar crossover to a 1-inch dome tweeter.

The tweeter's voice coil is both cooled and damped by a silicone compound, and its dome is loaded by a horn that Cerwin-Vega calls an Elliptical Acoustical Transformer. While any horn can be described as an acoustical transformer, this one has an elliptical cross section (with the longer axis oriented horizontally) that is said to give it better directional properties than those of a dome radiator alone. Although it is not a part of the 250SE, or required for its proper operation, Cerwin-Vega also manufactures a special bass equalizer, the DB-10 Bass Turbocharger, that can be connected in the amplifier's signal path to increase the drive level by either 5 or 10 dB at 32 Hz. The equalizer has no effect above 60 or 70 Hz and attenuates signals below 20 Hz. It is intended to restore deep-bass response to speakers whose output falls off below 40 Hz or so (a category that includes most home speakers). Removing the 250SE's black grille cloth, which is retained by sturdy plastic snaps, reveals the drivers and two knobs for adjusting the levels of the high-frequency and midrange drivers.

The cabinet measures 28 inches high, 12-1/2 inches wide, and 11-1/2 inches deep (including the integral pedestal base), and it has a black woodgrain-vinyl finish with a black flocked covering on the front panel. The rear contains the spring-loaded speaker-wire connectors. Each speaker weighs about 35 pounds. Price: $300 each; DB-10 Bass Turbocharger, $49.95.

Lab Tests We experimented with several combinations of control settings when measuring the room response of the Cerwin-Vega 250SE's. Best Mp3 Download Apk Android Apps Free here. The flattest response was obtained with the high-frequency control set at its minimum and the midrange control at its midpoint, so these settings were used throughout our subsequent measurements.

When we combined the room response with the close-miked woofer response, the composite frequency-response curve of the 250SE was flat within 7.5 dB from 24 to 15,000 Hz. Although the response shape could be altered to suit almost any taste with the speaker's controls, the high-frequency output dropped rapidly above 15,000 Hz. Our quasi-anechoic FFT response measurements confirmed the general nature of the response curve, including the high-frequency rolloff above 15,000 Hz. It also showed a periodic response variation, with peaks occurring at intervals of about 1,500 Hz over the entire frequency range. This characteristic was also visible on the FFT response plots supplied by the manufacturer.

It was not apparent in the room-response curves, however. The difference in frequency response between the on-axis and 45-degree off-axis measurements was less than 6 dB over the full range up to about 15,000 Hz. The phase linearity of the system was good, with an overall group-delay variation of about 0.4 millisecond from about 500 Hz to beyond 20,000 Hz. The system's sensitivity measured 93 dB at 1 meter with an input of 2.83 volts (1 watt) at 1,000 Hz.