Rane MA 4 Instruction Manual
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Rane MA 4 Instruction Manual

Rane MA 4 Instruction Manual

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MA 4
MULTICHANNEL AMPLIFIER
CONTENTS
(in order of appearance)
Important Safety Instructions
MA 4 Manual
MA 4 Data Sheet
MT 4 Data Sheet
Constant-Voltage Audio Distribution Systems
Sound System Interconnection
Warranty
Declaration of Conformity
21583

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Summary of Contents for Rane MA 4

  • Page 1 MA 4 MULTICHANNEL AMPLIFIER CONTENTS (in order of appearance) Important Safety Instructions MA 4 Manual MA 4 Data Sheet MT 4 Data Sheet Constant-Voltage Audio Distribution Systems Sound System Interconnection Warranty Declaration of Conformity 21583...

  • Page 2: Important Safety Instructions

    • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. CAUTION: Changes or modifications not expressly approved by Rane Corporation could void the user's authority to operate the equipment. CAN ICES-3 (B)/NMB-3(B)

  • Page 3: Instructions De Sécurité

    • Consulter un revendeur ou un technicien radio / TV expérimenté. ATTENTION: Les changements ou modifications non expressément approuvés par Rane Corporation peuvent annuler l'autorité de l'utilisateur à manipuler cet équipement et rendre ainsi nulles toutes les conditions de garantie.

  • Page 4: Quick Start

    SENSITIVITY SENSITIVITY 80Hz LOAD LOAD LOAD LOAD Active Low Use Rane VR 2 or 20 k pot MASTER COMP + – + – + – + – + – + – + – + – SLAVE + – + –...

  • Page 5: Description And Operation

    FAULT REMOTE LEVEL 40Hz FLAG 60Hz SENSITIVITY SENSITIVITY SENSITIVITY SENSITIVITY 80Hz Active Low Use Rane VR 2 or 20 k pot MASTER COMP SLAVE + – + – + – + – Vr Vc Vr Vc Vr Vc Vr Vc + –...
  • Page 6 INT EXT INT EXT INT EXT INT EXT set to Slave. The Master fault flag is wired to the Slave fault flag. If two different MA 4 amplifiers are involved (recommended), also wire the fault flag grounds LOAD LOAD LOAD LOAD...

  • Page 7: Advanced Applications

    ZONE 4 SOURCE 1 LINEAR POTS SOURCE 2 SOURCE 3 SOURCE 4 ©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 USA TEL 425-355-6000 FAX 425-347-7757 WEB rane.com Manual-4 All features & specifications subject to change without notice. DOC 111037...

  • Page 8: Specifications

    MA 4 MULTICHANNEL AMPLIFIER Specifications Parameter Specification Conditions/Comments Input impedance 10 kΩ Each leg, differential, 1 kHz Maximum input +22 dBu Sensitivity range/resolution +22 to +4 dBu 256 steps Remote level control range/resolution Attenuate only; 0 dB to –80 dB...
  • Page 9 SENSITIVITY SENSITIVITY 80Hz LOAD LOAD LOAD LOAD Active Low Use Rane VR 2 or 20 k pot MASTER COMP + – + – + – + – + – + – + – + – SLAVE + – + –...

  • Page 10: Block Diagram

    MA 4 MULTICHANNEL AMPLIFIER Block Diagram POWER-FACTOR- SWITCH-MODE CORRECTION POWER SUPPLY COMBINATION CONTROLLER Data Sheet-4...
  • Page 11 MA 4 MULTICHANNEL AMPLIFIER LOW VOLTAGE FLYBACK DETECT OUTPUT LEVEL DETECT OUTPUT LEVEL DETECT OUTPUT LEVEL DETECT OUTPUT LEVEL ± ( COMP ON/OFF EXP ON/OFF Data Sheet-5...

  • Page 12: Architectural Specifications

    -order Butterworth filters. Load sensitive be provided. limiter circuits shall prevent clipping and the associated loss of The unit shall be a Rane Corporation Model MA 4. speech intelligibility. A front panel LED shall indicate limiter activity within each channel.

  • Page 13: Data Sheet

    Audio Distribution Systems: 25, 70.7 & 100 Volts” available at watt 100 volt output. The recommended load for the 70 volt tap rane.com. is 50 Ω. The recommended load for the 100 volt tap is 100 Ω. Convenient Euroblock connectors are provided on the rear of the chassis.

  • Page 14: Rear Panel

    State of California to cause cancer, or birth defects or other reproductive harm. ©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 USA TEL 425-355-6000 FAX 425-347-7757 WEB rane.com Data Sheet-2 All features & specifications subject to change without notice. PN 15178 DOC 108152...
  • Page 15 It became an economic and physical necessity. Copper was too expensive and large cable too • Wire Size — How Big is Big Enough? cumbersome to do things the home hi-fi way. • Rane Constant-Voltage Transformers Dennis Bohn Rane Corporation RaneNote 136 ©...
  • Page 16 Stemming from this need to minimize cost, maxi- Basics — What is “Constant” Anyway? mize efficiency, and simplify the design of complex The term “constant-voltage” is quite misleading and audio systems, thus was born constant-voltage. The key causes much confusion until understood. In electron- to the solution came from understanding the electric ics, two terms exist to describe two very different company cross-country power distribution practices.
  • Page 17 8Ω Figure 1 diagrams the alternative series-parallel 8Ω 8Ω 8Ω method, where, for example, nine loudspeakers are wired such that the net impedance seen by the ampli- fier is 8 ohms. The wiring must be selected sufficiently 8Ω 8Ω 8Ω large to drive this low-impedance value.
  • Page 18 Voltage Variations — Make Up Your Mind Calculating Losses — Chasing Your Tail The particular number of 70.7 volts originally came As previously stated, modern constant-voltage am- about from the second way that constant-voltage plifiers either integrate the step-up transformer into distribution reduced costs: Back in the late ’40s, UL the same chassis, or employ a high voltage design to safety code specified that all voltages above 100 volts...
  • Page 19 Table 1: 70.7V Loudspeaker Cable Lengths and Gauges for 1.5 dB Power Loss Wire Gauge > Max Current (A) > Max Power (W) > 1060 1400 2100 3100 Load Load Power Ohms Maximum Distance in Feet 1000 1450 12.5 1178 1813 1178 1885...
  • Page 20 Engineering, 2nd Ed. (Sams, 1987) provides a through treatment of the potential interface problems. Reproduced by permission of the author and Howard W. Sams & Co. ©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 TEL 425-355-6000 FAX 425-347-7757 WEB rane.com Constant-Voltage-6 DOC 103210 3-16...

  • Page 21: Sound System Interconnection

    —Grounding and EMC practices — Shields of connectors in audio equipment containing active circuitry.” Rane’s policy is to accommodate rather than dic- tate. However, this document contains suggestions for external wiring changes that should ideally only be implemented by trained technical personnel. Safety...

  • Page 22: Ground Loops

    Ground Loops Almost all cases of noise can be traced directly to improperly, thus creating balanced equipment that is ground loops, grounding or lack thereof. It is important not immune to the cabling’s noise currents. This is one to understand the mechanism that causes grounding reason for the bad reputation sometimes given to bal- noise in order to effectively eliminate it.
  • Page 23 Well, some does, and since 1993, A balanced line requires three separate conduc- more of it does. That’s when Rane started manufac- tors, two of which are signal (+ and –) and one shield turing some of its products with balanced inputs and (see Figure 1a).
  • Page 24 Another way to create the necessary isolation is to RF issues exist, though the increasing use of digital and use a direct box. Originally named for its use to convert wireless technology greatly increases the possibility of the high impedance, high level output of an electric future RF problems.
  • Page 25 Convention of Audio Engineering Society in San Fran- ground using a star washer for a reliable contact. cisco, CA, Nov. 1994. (Rane always provides this chassis point as an exter- 2. Grounding, Shielding, and Interconnections in Analog nal screw with a toothed washer.) Any device with &...

  • Page 26: Cable Connectors

    To Input CABLE CONNECTORS MALE ¼" BALANCED ¼" OR 3.5mm UNBALANCED RCA BALANCED BALANCED XLR TRS (TIP-RING-SLEEVE) UNBALANCED EUROBLOCK TS (TIP-SLEEVE) FEMALE BALANCED XLR – – (NOT A TRANSFORMER, SHIELD NC NOR A CROSS-COUPLED OUTPUT STAGE) – – FEMALE BALANCED XLR (EITHER A TRANSFORMER SHIELD NC OR A CROSS-COUPLED...
  • Page 27 MALE FEMALE 1=SHIELD 1=NC 2-CONDUCTOR SHIELDED CABLE 2=RED BLACK BLACK 2=RED 3=BLACK SHIELD 3=BLACK FEMALE T=RED 1=SHIELD 2=RED BLACK R=BLACK BLACK 2-CONDUCTOR SHIELDED CABLE S=NC 3=BLACK SHIELD FEMALE 1=SHIELD T=RED 1-CONDUCTOR SHIELDED CABLE 2=RED 3=NC SHIELD SHIELD S=SHIELD FEMALE 1=SHIELD 2=RED 1-CONDUCTOR SHIELDED CABLE T=RED...
  • Page 28 S=BLACK SHIELD CROSS-COUPLED OUTPUT ONLY: CONNECT BLACK TO SHIELD AT THIS END AND SET GROUND LIFT SWITCH TO ‘GROUNDED’ (IF PRESENT). ©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 USA TEL 425-355-6000 FAX 425-347-7757 WEB www.rane.com Interconnection-8 DOC 102907...

  • Page 29: Factory Authorized Service

    Rane Factory in the original packaging or a replacement supplied by Rane, with all transportation costs and full insurance paid each way by the purchaser or owner.
  • Page 30 Rane Corporation within 10 days from the date of purchase. If you purchased the product outside the U.S.A. you must file your warranty registration with the Rane Distributor in that country. It is advised that you keep your bill of sale as proof of purchase, should any difficulties arise concerning the registration of the warranty card.

  • Page 31: Declaration Of Conformity

    EMC directive in the event that the equipment is modified without writ- ten consent of the manufacturer. This declaration of conformity is issued under the sole responsibility of Rane Corporation. Type of Equipment:...
  • Page 32 MA 4 MULTICHANNEL AMPLIFIER...

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