GALAXY AUDIO ® CORE X250 CORE XP250 ® OWNER’S MANUAL © 1999 Galaxy Audio, Inc.
WARNING! TO PREVENT THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. TO PREVENT THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. This symbol indicates that a dangerous voltage constituting a risk of electric shock is present within this unit. This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit.
TABLE OF CONTENTS TYPICAL SETUP ----------------------------------------------------------------------------------------------------- 2 CORE X250 FRONT PANEL -------------------------------------------------------------------------------------- 4 CORE XP250 FRONT PANEL ------------------------------------------------------------------------------------ 5 CORE X250/XP250 REAR PANEL ------------------------------------------------------------------------------ 6 SOUND REINFORCEMENT BASICS --------------------
CORE X250 ® TYPIC AL SETUP TYPICAL Virtually any combination of mics, instruments, or tape/CD players may be simultaneously plugged into the inputs for all channels with the exception of the ¼” and RCA jacks for Channel 4. Since Channel 4’s ¼” and RCA jacks are parallel, simultaneously using both will result in diminished sound quality.
! Explanations of controls and jacks are preceded by boxes. A WIRELESS MIC B WIRELESS MIC RECEIVER OUTPUT to CORE X250 MIC (XLR) INPUT: Channel 1, and/or 2, and/or 3 ! MIC IN (+24VDC phantom power) connects a microphone or other device which uses an XLR plug. Use ONLY balanced devices and cables. ! LEVEL controls the amount (volume) of the channel’s signal that is sent to the MASTER mix. ! AUX controls the amount (volume) of the channel’s signal that is sent to the AUX mix.
CORE X250 ® FRONT P ANEL PANEL LEVEL CONTROLS FOR CHANNELS 1, 2, 3 AND AUX RETURN CHANNEL 1 MIC (XLR) INPUT SmartALIC (All Level Input Control) compensates for the CHANNEL 1 LEVEL difference in gain and level between line and mic CHANNEL 1 AUX SEND signals. LINE LEVEL (7 o’clock to 12 o’clock) CHANNEL 2 MIC (XLR) INPUT for tape decks, CD players. etc.. MIC LEVEL (12 o’clock to 5 o’clock) for CHANNEL 2 LEVEL mics and instruments.
CORE XP250 ® FRONT P ANEL PANEL LEVEL CONTROL POWER LIMIT LED Indicates when the built-in compression circuit is activated. By automatically reducing gain when clipping occurs the compression circuit prevents distortion. The LIMIT LED remains lit about half the time when the amplifier is being driven to its maximum potential. Do not allow it to remain lit more than half the time.
CORE X250/XP250 ® AC INLET Models XR250 XPR250 REAR P ANEL PANEL I/O PORT Modesl X250 XR250 All channel inputs, the Main Line output and the Aux Main output are available on two 8-pin 0.100" centerline connectors. Recommended mating plug: Molex 22-50-3085 (Molex22-41-5082 is also usable).
SOUND REINFORCEMENT BASICS AVOIDING FEEDBACK Feedback (the shriek sometimes emitted by sound systems) occurs when the microphone (or pickup) and speaker are positioned too close together for a given level of volume. Once feedback occurs it will continue until either the volume is decreased or the distance between the microphone and speaker is increased. Gain is the degree to which the volume may be increased before feedback begins.
MAXIMIZING GAIN Figure 1.1 represents the worst possible case of gain limiting; the microphone is pointed directly at the speaker. Any increase in volume will instantly produce feedback. As little as 1/1000 of the amplifier’s power may be available. With a 100 watt amplifier, that’s only 1/10 of a watt. In Figure 1.2, the distance between the microphone and the speaker has increased to 500 feet, allowing 100 percent gain (all 100 watts of power may be utilized without producing feedback).
Ohm’s Law and the CORE X250 The SPEAKER OUTPUT jacks on the front and back of the CORE X250 are designed to power the CORE PA10X or PA15X and one CORE (or other brand) 8 ohm satellite speaker or two HOT SPOTs. Most professional-type speakers (like the HOT SPOT) have two jacks which are wired in parallel (meaning the signal can travel into one jack and out of the other). Think of each speaker as a “load” added to the amplifier. The greater the number of speakers, the heavier the load.
CORE X250 ® SPECIFIC ATIONS SPECIFICA Rated Power: 250 watts @ 4Ω, 150 watts @ 8Ω Frequency response: 40 Hz–20 kHz Signal-to-Noise Ratio: >95 dB Total Harmonic Distortion: <0.06% @ 4Ω, <0.
CORE XP250 Rated Power: 250 watts @ 4Ω, 150 watts @ 8Ω Frequency response: 40 Hz–20 kHz Signal-to-Noise Ratio: >95 dB Total Harmonic Distortion: <0.06% @ 4Ω, <0.
ARCHITECT and ENGINEER SPECIFIC ATIONS SPECIFICA The system shall be an amplifier/mixer capable of producing 250 continuous watts of power to a 4 ohm load, 155 watts of continuous power to an 8 ohm load. The mixer section (models X250 and XR250) shall include one balanced (differential) input using a ¼-inch phone plug connector, a dual-summed RCA connector, and three +24 VDC phantom powered balanced (differential) inputs using XLR connectors.
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GAL AXY A UDIO ALA AUDIO 601 E. Pawnee Wichita, KS 67211 316. 263.2852 FAX 316.263.0642 www.galaxyaudio.com Distributed outside the United States and Canada by E and E Exports, Inc. 17922 Sky Park Circle, Suite P, Irvine, CA 92714 949.440.0760 FAX 949.440.0766 Distributed in Canada by A.C. Simmonds & Sons Limited 580 Granite Court, Pickering, Ontario, Canada L1W 3Z4 905.839.8041 FAX 905.839.
