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Manual-1

MA 4

MULTICHANNEL AMPLIFIER

DIGITAL

AMPLIFIER

dB Headroom

3
6

12
24

Limit

Comp
Exp

Fault
Load
Ready

3
6

12
24

Limit

Comp
Exp

Fault
Load
Ready

3
6

12
24

Limit

Comp
Exp

Fault
Load
Ready

3
6

12
24

Limit

Comp
Exp

Fault
Load
Ready

MA 4

OPERATORS MANUAL

Quick Start

Basic MA 4 operation is straightforward:

1. The universal switching power supply works with 100 to 240 VAC, 50/60 Hz.

2. Make sure the front panel power switch is

off

(the unit consumes 5 watts in standby mode).

3. Connect balanced inputs (rear panel).

4. Set SENSITIVITY controls to +22 (see why on page Manual-2) (rear panel).

5. Turn the Downward EXPander ON (rear panel).

6. Set COMPressor to 10 dB (rear panel).

7. Select the appropriate HIGH PASS filter frequency (20, 40, 60 or 80 Hz on rear panel).

8. Connect speaker loads (rear panel).

9. Make sure you have adequate ventilation around the unit – see Safety Instructions.

10. Turn ON the front panel power switch. You’re good to go!

Metering shows the status of the amplifier at a glance (see page Manual-3). Headroom (with any load), dynamics control, Fault status

and Load status are indicated for each channel.

Extra Credit

For remote turn-on, fault reporting and back-up amplifier operations, and remote level control wiring, see page Manual-4.

For FAULT FLAG operation (applications and reported faults), see page Manual-3.

MA 4

100-240V

50/60 Hz 500 WATTS

RANE CORP.

Class 2 Wiring

OUTPUTS

Active Low

Use Rane VR 2 or 20 k

pot

HIGH-PASS

20Hz

40Hz

60Hz

80Hz

+ – + – + – + –

+ – + – + – +

REMOTE LEVEL

FLAG

FAULT

Vr Vc

–

+ – + – + – + –

3 2 1

MASTER

SLAVE

COMP

4 3 2 1

1 2 3 4

+ –

Vr Vc

+ –

INPUTS

MODE

dBu

SENSITIVITY

dBu

SENSITIVITY

dBu

SENSITIVITY

dBu

SENSITIVITY

EXP ON

INT EXT

LOAD

INT EXT

LOAD

INT EXT

LOAD

INT EXT

LOAD

COMMERCIAL AUDIO

EQUIPMENT 24TJ

–

SOURCE 4

SOURCE 3

SOURCE 2

SOURCE 1

WEAR PARTS: This product contains no wear parts.

Installation

• No rear mounting hardware required.

• Allow adequate ventilation to keep ambient temperature around the amplifier below 104˚F (40˚C).

• Fan cooled with inset intake on left side and inset exhaust on right side (no filter)

• Amplifier heat load in Btu/hr at 100/240 VAC

º 10.2 / 13.3 Btu/hr All amplifiers in standby

º 112.3 / 95.5 Btu/hr All amplifiers on, no signal

º 167 / 139 Btu/hr All amplifiers driven, pink noise, 12 watts avg. 4:1 crest

Note: 1 watt x 3.413 = 1 Btu/hr.

Содержание MA 4

Страница 1: ...e Audio Distribution Systems Sound System Interconnection Warranty Declaration of Conformity 21583 DIGITAL AMPLIFIER dB Headroom dB Headroom dB Headroom dB Headroom 3 6 12 24 Limit 1 Comp Exp Fault Lo...

Страница 2: ...he power cord is the AC mains disconnect device and must remain readily operable To completely disconnect this apparatus from the AC mains disconnect the power supply cord plug from the AC receptacle...

Страница 3: ...r le courant alternatif AC et doit absolument rester accessible Pour d connecter totalement l appareil du secteur d branchez le c ble d alimentation de la prise secteur 16 Cet appareil doit tre branch...

Страница 4: ...nd Load status are indicated for each channel Extra Credit For remote turn on fault reporting and back up amplifier operations and remote level control wiring see page Manual 4 For FAULT FLAG operatio...

Страница 5: ...or see metering indicates the load status The normal impedance range is 2 to 16 green Load indicator on Average load impedance is estimated over 180 ms and requires a minimum of 3 3 watts averaged ove...

Страница 6: ...t The front panel fault indicator is then lit The Slave channel remains in low power standby Ready indicator flashing until a fault is detected fault flag no longer driven high by the Master channel W...

Страница 7: ...r 10k to 100k may be connected to these inputs diagram at right MA 4 100 240V 50 60 Hz 500 WATTS RANE CORP Class 2 Wiring OUTPUTS Active Low Use Rane VR 2 or 20 k pot HIGH PASS 20Hz 40Hz 60Hz 80Hz ON...

Страница 8: ...0 40 60 80 Hz dipswitch select Load sensing 2 to 16 normal Green Load indicator on Low load detect Below 2 is low Green Load indicator flashing High load detect Above 16 is high Green Load indicator o...

Страница 9: ...s all channels Filters are 12 dB per octave Butterworth alignment 8 Each channel is set for MASTER or SLAVE operation Master channels write Fault Flag status Slave channels read Fault Flag status The...

Страница 10: ...L U A F D A O L Y D A E R P X E B d 3 B d 6 B d 2 1 B d 4 2 T I M I L P M O C T L U A F D A O L Y D A E R P X E 4 H C 3 H C 2 H C 1 H C P S D T S O H D N G Y T I V I T I S N E S 4 H C 3 H C 2 H C 1 H...

Страница 11: ...2 Z H 0 4 z H 0 6 z H 0 8 E D O M V 8 0 O T V 0 0 Y B D N A T S V 0 3 O T V 2 2 E T U M V 5 5 O T V 2 4 N O 1 M 2 M 3 M 4 M 1 M 2 M 3 M 4 M E S N E S Y L P P U S 5 2 R E T I M I L K A E P DETECT RMS...

Страница 12: ...selection of 20 40 60 or 80 Hz highpass 2nd order Butterworth filters Load sensitive limiter circuits shall prevent clipping and the associated loss of speech intelligibility A front panel LED shall i...

Страница 13: ...k connectors model KT 4 and individual transformers with mounting hardware model TF 4 are available separately allow ing the installer to build a tray with just the number of channels required see the...

Страница 14: ...5178 DOC 108152 Rane Corporation 10802 47th Ave W Mukilteo WA 98275 5000 USA TEL 425 355 6000 FAX 425 347 7757 WEB rane com Rubber washer Rubber washer KT 4 tray Mounting washer 10 washer Nut Screw 1...

Страница 15: ...1949 governing the interface between power amplifiers and loudspeakers used in distributed sound systems Installations em ploying ceiling mounted loudspeakers such as offices restaurants and schools...

Страница 16: ...as the constant voltage distribution method Early mention is found in Radio Engineering 3rd Ed McGraw Hill 1947 and it was standardized by the American Radio Manufacturer s Association as SE 101 A SE...

Страница 17: ...w different loudness levels in different coverage zones With this scheme the wire size is reduced considerably from that required in Fig ure 1 for the 70 7 volt connections Becoming more popular are v...

Страница 18: ...for so many watts output at 70 7 volts and a loud speaker is rated for so many watts input producing a certain SPL Designing a system becomes a relatively simple matter of selecting speakers that wil...

Страница 19: ...the first speaker where only 0 1414 amps are used to create the necessary 10 watts from here 14 00 amps flows on to the next speaker where another 0 1414 amps are used then 13 86 amps continues on to...

Страница 20: ...7V tapped secondary KT 4 Open 1U tray chassis with connectors mounts four TF 4 transformers Use MT 4 transformers with any standard power amplifier and any combination of constant voltage loads up to...

Страница 21: ...rconnections 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 sugges...

Страница 22: ...al grounding system improperly thus creating balanced equipment that is not immune to the cabling s noise currents This is one reason for the bad reputation sometimes given to bal anced interconnect A...

Страница 23: ...n Figure 1b Recommmended practice CASE COMMON WRONG PRACTICE RECOMMENDED PRACTICE OPTIONAL CASE 1 2 3 3 1 2 CHASSIS GROUND SIGNAL GROUND CHASSIS GROUND CHASSIS GROUND Not using signal ground is the mo...

Страница 24: ...consistent success indicates this and other acceptable solutions to RF issues exist though the increasing use of digital and wireless technology greatly increases the possibility of future RF problem...

Страница 25: ...eferences 1 Neil A Muncy Noise Susceptibility in Analog and Digi tal Signal Processing Systems presented at the 97th AES Convention of Audio Engineering Society in San Fran cisco CA Nov 1994 2 Groundi...

Страница 26: ...20 24 24 19 18 17 B B B B A A A A A A FEMALE BALANCED XLR NOT A TRANSFORMER NOR A CROSS COUPLED OUTPUT STAGE FEMALE BALANCED XLR EITHER A TRANSFORMER OR A CROSS COUPLED OUTPUT STAGE BALANCED TRS NOT A...

Страница 27: ...RED SHIELD RED SHIELD SHIELD RED RED BLACK N C N C N C RED BLACK RED SHIELD N C BLACK RED BLACK RED 3 NC 2 RED 1 SHIELD 2 RED 1 SHIELD 3 BLACK 2 RED 1 NC 3 BLACK 2 RED 1 NC 3 BLACK 2 RED 1 SHIELD SHIE...

Страница 28: ...3 BLACK 2 RED 1 SHIELD 3 BLACK 2 RED 1 SHIELD 3 BLACK 2 RED 1 SHIELD SHIELD BLACK SHIELD RED BLACK SHIELD RED BLACK RED SHIELD SHIELD BLACK RED SHIELD BLACK RED SHIELD BLACK RED SHIELD BLACK RED SHIE...

Страница 29: ...WARRANTY SHALL BE THAT WHICH IS DESCRIBED TO THE ORIGINAL RETAIL PURCHASER BY THE AUTHORIZED RANE DEALER OR DISTRIBUTOR AT THE TIME OF PURCHASE Rane Corporation does not however warrant its products a...

Страница 30: ...FACTORY IN THE U S If the product is being sent to Rane for repair please call the factory for a Return Authorization number We recommend advance notice be given to the repair facility to avoid possi...

Страница 31: ...sponsibility of Rane Corporation Type of Equipment Professional Audio Signal Processing Brand Rane Model MA 4 Immunity Results THD N re 12 5W 8 400 Hz sine BW 20 20 kHz Baseline 72 dBr Test Descriptio...

Страница 32: ...2 1 FAULT Vr Vc Vr Vc Vr Vc Vr Vc 3 2 1 MASTER SLAVE COMP 4 3 2 1 1 2 3 4 Vr Vc Vr Vc Vr Vc Vr Vc INPUTS MODE 13 22 dBu SENSITIVITY 4 3 13 22 dBu SENSITIVITY 4 2 13 22 dBu SENSITIVITY 4 1 13 22 dBu S...

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