NEW PRODUCTS 31-Band Hi-TekT\I Equalizer by Bogi .......................... Safro Steel Roll Files Safco Products Company introduces durable steel roll files with an anti-racking design to provide high volume storage for materials too large to store flat. Square ~iberboard compartments with protective aluminum edging provide easy access to rolled materials. Reversible piano-hinge doors allow right or left hand opening for versatile organization and increased convenience_ Other features include a convenient identification grid, four dimples on each file for secure stacking and an optional metal base. The file is available in four tube lengths and two tube sizes. 3'14' and 2'/& ". in cabinets measuring 15 ' 1. x 15'1. x 26: 15 ' I.X15 ' I.x32: 15 ' I.x15'I.x38 and 15" x 15" x 44. For more informallon contact Satco Products Company. 9300 West Research Center Road. New Hope. MN 55428: (612) 536-6700. 36 Thealre Design & Technology/ SITT /Spring 1986 The HTE-31 Graphic Equalizer is the nE est Hi-Tek™ Professional Series model Bogen. a Lear Siegler company Bogen ( signed the '13-octave, 31-band unit to prov sound professionals with a precise means tailoring frequency response in high-qua sound systems. Bogen's Hi-Tek equalizer has a stand, EIA 19"-wide front panel for rack mounting. I takes up only 3 12" in height. Within that co ' pact area, it features slide controls for thir one LC-type active filters at standard ISO f quencies. a filter-bypass switch that allows ( eration either flat or with the established fil response. a calibrated master level conti and a LED overload indicator. Balanced. transformerless inputs and a puts eliminate magnetic field susceptibill Unbalanced inputs can be used because ( ferential amplifier ICs used in the HTE - 31 P vide superior hum rejection. Input impedan is 40K ohms balanced and 20K ohms unb anced. Balanced and unbalanced outputs c be used simultaneously. The equalizer's rat output of + 26 dBm into 600 ohms is she cirCUit protected. Thirty-one filters cover the range fre 20Hz to 20kHz. Each is set at its assign '13-octave ISO frequency to give mlnimL combinational ripple and maximum usefulne~ Both RC and ferrite filters are used to minimi susceptibility to RF interference. The contre have center detents and can cut or boost up 12 dB. High and low band filters provide 18 d octave rolioH from 125 and 315kHz respE tively. The LED overload indicator responds monitoring of levels at three circuit points: put. preequallzation and output. Speclficallons include equivalent inr: noise of less than - 95 dBm: frequency I sponse of ± 0.5 dB. 20 Hz - 20kHz in EO t pass mode: THO of less tllan 0.05%. 20H. 20kHz at + 20 dBm output. The black-finish, equalizer weighs 9 Ibs. and IS supplied witt"' transparent. smoked acrylic. protective cov that discourages tampering With the slides al other controls. For more Informallon contact Bogen. P Box 500. Paramus. NJ 07653. The HTE-31 available In Canada through Atlas Electroni, L d.. Toran o.