Gold Seal Series Public Address Amplifiers
Model GS250
The Bogen Gold Seal Series amplifiers are an extraordinary addition to Bogen's line of quality audio amplifiers. Designed with the sound contractor in mind, they provide unparalleled flexibility and versatility, without the need for add-on modules. The GS250 model enhances the Gold Seal line with 250 watts of power in the same 2 rack space package as the other Gold Seal amplifiers. Unlike other typical amplifier lines, the professional sound contractor need not purchase a higher-powered amplifier just to get more extensive features or flexibility. Each of the Gold Seal Series amplifiers ­ 250W, 150W, 100W, 60W and 35W models ­ incorporate the exact same set of features. In addition to its extensive input flexibility, the Gold Seal Series amplifiers offer a combination of features not found in any other commercial amplifier. Description · 4 dedicated MIC inputs (XLR connectors) · Remote master volume control capability · Input muting via contact closure on all inputs · Voice-activated AUX muting on TEL input · AUX fade-back after TEL page · Pre-amp out/Power amp in (insert) connections · Booster amp output connection · Tape output connection · Balanced line driver output (using WMT1A accessory) · Low-cut filter for MIC channels · 3-speed fan cooling · Tamper-resistant front cover (GSTRC) available · Rack mounting kit (GSRPK) available · Remote volume control (GSRVC) available Features · 1 selectable MIC/TEL input · 1 selectable MIC/AUX input · 1 dedicated AUX input · 4-ohm direct coupled output · 8-ohm, 25V, 25VCT, and 70V transformer-coupled outputs · Rack mountable ­ 2RU package · Dual-function 10-band graphic equalizer (Acoustic EQ or Feedback Control) · True loudness contour function · Aphex® Aural Exciter for improved intelligibility · Switchable phantom power (per MIC input) · Variable AUX input muting Specifications subject to change without notice. © 1997 Bogen Communications, Inc. Part No. 54-7882-03C 0707 Aphex Aural Exciter is a trademark of Aphex Systems, Ltd. Technical Specifications Power Rating (RMS): Frequency Response Transformer Output: Direct: Distortion Direct: Transformer: Signal-to-Noise Ratio: Inputs/Outputs: 250 watts 65 Hz to 20 kHz, +0/-2dB @ -2 dB 20 Hz to 20 kHz, +0/-1dB @ rated power 0.5% (max.), 0.3% (typ.), 20 Hz to 20 kHz 0.5% (max.), 0.3% (typ.), 65 Hz to 20 kHz @ -2 dB Fundamental: -94 dB or better; AUX 1 & 2: -70 dB; TEL: -70 dB or better @ 600 ohms; MIC 1 ­ 6: -60 dB or better @ 200 ohms 6 MIC: Lo-Z balanced via 4 XLR connectors and 2 screw terminals; Sensitivity: 0.35mV (200 ohms) 2 AUX: Hi-Z RCA jacks; Sensitivity: 0.085V (10k ohms) Telephone: Screw terminals; Sensitivity: 0.07V (600 ohms) Output to Power Amp: 5V @ Rated Output via RCA jack Power In/Pre Out: In 1V/Out 1V via RCA jacks WMT1A Output: 25V @ Rated Output via RCA jack Tape Output: 687mV @ Rated Output via RCA jack All models: balanced or unbalanced 8-ohm, 25V, 25VCT, 70V, 4-ohm direct Better than 2 dB from no load to full load 4 steps: -60, -21, -10, 0 dB (Aux 1 & 2) Distortion: less than 0.5%; Compression: 25 dB Tel Input: 20mV (VOX control max. CW position) Via terminal strip. -60 dB: MIC 1, 2, 3, 5/TEL 6/AUX 1, AUX 2 In: 1V; Out: 1V +8 dB @ 100 Hz, +4 dB @ 10 kHz (AUX 1 & 2 control at 1/4 CW position) Type A9 Electronic with automatic reset 105°C (220°F) thermistor attached to heat sink 7A/125V AC Slo-Blo 480 watts, 120V AC, 60 Hz 16-1/2" W x 3-1/2" H x 12" D 33 lb. The amplifier's TEL input shall include automatic level control to provide consistent output regardless of who is paging, and a four-step VOX-activated AUX mute level. Provisions shall also be included for remote volume control, using an accessory control unit. Outputs shall be provided for 4- and 8-ohm speakers and for 25V, 25VCT, and 70V distributed systems. Additional outputs shall be provided to feed a booster amp and tape recorder. A dedicated output shall permit feeding a 600ohm telephone line using an accessory transformer (Model WMT1A). A Pre-amp out/power amp in circuit shall be provided to insert signal processing equipment. The amplifier shall be rack mountable using an accessory rack panel kit. It shall be UL and CSA listed. Output Impedance: Output Regulation: Variable Mute Range: ALC: VOX Threshold: MIC Precedence: Pre-amp Out/Power Amp In: Loudness Contour: Aphex Aural Exciter: Overload Protection: Thermal Protection: Line Fusing: Power Consumption: Dimensions: Shipping Weight: Architect and Engineer Specifications The amplifier shall be a model GS250, rated at 250 watts RMS, with three-speed fan cooling. The amplifier shall accommodate up to 6 Lo-Z balanced microphones, 2 Hi-Z auxiliary sources and a telephone paging input (MIC 5 shall be switch-selected for mic or telephone line; MIC 6 switch-selected for microphone or AUX 1). MIC 1 through 4 shall use XLR-type connectors; AUX input shall be via RCA phono jacks and all other connectors shall use screw terminals. Phantom power shall be supplied for use with condenser microphones. Microphone precedence connections shall be included for MIC 1, 2, 3, 5/TEL, 6/AUX 1, and AUX 2. The amplifier shall provide a frequency response from 20 Hz to 20 kHz +0/-1 dB at rated power. Distortion shall be 0.3% typically, from 20 Hz to 20 kHz direct at rated power, and from 65 Hz to 20 kHz transformer @ -2 dB. The amplifier shall include an Aphex Aural Exciter circuit, variable loudness contour control and dual-function equalizer. The equalizer shall be switch-selectable for feedback control or acoustic shaping and shall include 10 centerdetent slide controls providing ±12 dB of boost or cut from 62.5 Hz to 16 kHz in acoustic mode and from 125 Hz to 8 kHz in feedback control mode. 50 Spring Street, Ramsey, New Jersey 07446, U.S.A. Tel. 201-934-8500; FAX: 201-934-9832; www.bogen.com