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Related Manuals for Krell Industries Power Amplifiers MDA-300/500
Summary of Contents for Krell Industries Power Amplifiers MDA-300/500
- Page 2 A. INTRODUCTION Thank you for your purchase of the KRELL MDA-300 or MDA-500 power amplifiers. These amplifiers represent the latest evolution in amplifier technology and incorpo- rate many innovative design features. To obtain the best performance from your MDA-300/ 500s, careful attention should be paid to placement, installation and operation.
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Page 3: Table Of Contents
TABLE OF CONTENTS UNPACKING AND ASSEMBLY BASIC INSTALLATION AND OPERATION INPUT AND OUTPUT CONNECTIONS AMPLIFIER OPERATION PROTECTION CIRCUITRY REAR PANEL DES CRIPTIONS QUESTIONS AND ANSWERS SPECIFICATIONS WARRANTY AND SERVICE INFORMATION... -
Page 4: Unpacking And Assembly
B. UNPACKING AND ASSEMBLY NOTE: Do to the extreme weight of the MDA-300 or MDA-500 it is strongly advised that unpacking and placement is completed by at least two individuals. 1. Open the box on one end. 2. Fold back the flaps on all four sides of the box and carefully roll it over on to the exposed end. -
Page 5: Basic Installation And Operation
C. BASIC INSTALLATION AND OPERATION 1. Place the MDA-300/500, on a firm level surface away from excessive dirt or moisture. Ideally the amplifiers ’ should be placed as close, to the speakers as possible. ,It is always preferable torun long interconnect cables to tt~e amplifiers and keep speaker cable length t.o a minimu~m.. -
Page 6: Input And Output Connections
D. INPUT AND OUTPUT CONNECTIONS CAUTION: When making connections to this component or any other, make sure ttie power amplifiers are OFF and the preamplifier is in the MUTE or STANDBY mode. 1. Connect the speaker cables to the output terminals of each amplifier. - Page 7 Thepin assignment for the XLR is: pin _1-= shiel-d (ground) p!n 2 = non-inverting input (hot) pin 3 = inverting input NOTE: The RCA center conductor for each channel is wired_in, parallel with pin 2, the non-inv, erted input. Only one ot these inputs Should be connectecl to a preamplifier.
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Page 8: Amplifier Operation
E. AMPLIFIER OPERATION 1. Push the black button on the front of both amplifiers to turn them on. The blue LED on the front panels above each switch will illuminate. When turning on the system, the amplifiers should al- ways be last.-The MDA-300/50.0s On/Off switch is part of a multi-level turn-on circuit that goes through several steps of protection. -
Page 9: Protection Circuitry
The amplifiers also have circuit breakers on their backpanel for the AC power. Should the button in the center of the breaker pop out, push it in to reset the breaker. If the amplifiers still do not come back on, call Krell Industries. -
Page 10: Rear Panel Descriptions
H. REAR PANEL DESCRIPTIONS All descriptions are for each amplifier chassis INPUTS: Balanced via 3 pin XER connector Single ended via RCA connector XLR PIN CONFIGURATION p!n 1 Shield (ground) p.ln 2 Non-inverting or 0 degrees (hot) pan 3 Inverting or 1-80 degrees OUTPUT: Two pairs of five-way binding posts in parallel OTHER:... -
Page 11: Questions And Answers
Push the power button on the front panel. If the problem persists, unplug the unit and call your dealer or Krell industries. Q. When I turn the amplifier on there is a loud hum through the speakers. There was never a hum before the MDA-300/500 was in the system. - Page 12 Q. After the amplifier is on for about one hour it be- comes very hot. Is this normal? A. Yes. Due to the high bias design of the MDA-300/500 it will become quite warm. After approximately 1 hour the amplifier will be at its optimum operating tempera- ture.
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Page 13: Specifications
J, SPECIFICATIONS MDA-300 GAIN 26dB SIGNAL-TO-NOISE 106dB unweighted 1K at 8 ohms less than .2% 20K at 8 ohms less than .4% INPUT IMPEDANCE 47,000 ohms (47K) INPUT SENSITIVITY 2.5 volts for 300 watts out OUTPUT IMPEDANCE .2 ohms OUTPUT VOLTAGE 139 volts peak to peak OUTPUT POWER All read!ngs... -
Page 14: Warranty And Service Information
K. WARRANTY AND SERVICE INFORMATION There are no user-serviceable parts inside the MDA-300/ 500. The MDA-300/500 has a limited warranty of f~ve years parts and labor. Return freight is included in ~the warranty. The warranty period b.egins on thee date ot p_u_rchase and is activated with the return ot the enclosed Warran.ty Card and a copy of the Sales receipt. - Page 15 KRELL INDUSTRIES 35 HIGGINS DRIVE MILFORD CT 06460 SALES 203-874-3139 FAX 203-878-8373 COPYRIGHT 1992 KRELL INDUSTRIES (MDA9204)
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