User Guide

ManualsBrandsToa ManualsLive Sound & StageTOA P-912MK2 900 Series Single Channel 120 Watts Power Amplifier

900 series

POWER AMPLIFIERS

P-906MK2

P-912MK2

P-924MK2

SIG

NORMAL

TECT

STER

OFF

PEAK

WER

PROTE

OFF

P-906MK2

P-912MK2

P-924MK2

OPERATING INSTRUCTIONS

Thank you for purchasing TOA's 900 Series Power Amplifier.

Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.

TABLE OF CONTENTS

1. IMPORTANT SAFETY INSTRUCTIONS ..... 2

2. SAFETY PRECAUTIONS ............................ 3

3. GENERAL DESCRIPTION .......................... 5

4. FEATURES .................................................. 5

5. NOMENCLATURE AND FUNCTIONS

Front ............................................................. 6

Rear .............................................................. 7

6. INSTALLATION AND CONNECTIONS

6.1. Input Connections ................................. 8

6.2. Speaker Connections ............................ 9

RACK MOUNTING BRACKET ATTACHMENT

... 11

8. OPERATION .............................................. 12

9. VOLUME CONTROL COVER ................... 12

10. DIMENSIONAL DIAGRAMS

10.1. P-906MK2, P-912MK2 ...................... 13

10.2. P-924MK2 ......................................... 14

11. SPECIFICATIONS

11.1. P-906MK2, P-912MK2 ...................... 15

11.2. P-924MK2 ......................................... 16

Summary of content (16 pages)

PAGE 1
OPERATING INSTRUCTIONS P-906MK2 P-912MK2 P-924MK2 900 series POWER AMPLIFIERS SIG NA L NO MA ST ER RM AL PR OT EC PE T SIG AK PO WE R ON OF F P-906MK2 P-912MK2 NA L NO RM AL PE AK MA PR ST ER OT EC T PO ON OF F WE R P-924MK2 TABLE OF CONTENTS 1. IMPORTANT SAFETY INSTRUCTIONS ..... 2 7. RACK MOUNTING BRACKET ATTACHMENT ... 11 2. SAFETY PRECAUTIONS ............................ 3 8. OPERATION .............................................. 12 3. GENERAL DESCRIPTION ...................
PAGE 2
1. IMPORTANT SAFETY INSTRUCTIONS • Read these instructions. • Keep these instructions. • Heed all warnings. • Follow all instructions. • Do not use this apparatus near water. • Clean only with dry cloth. • Do not block any ventilation openings. Install in accordance with the manufacturer's instructions. • Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
PAGE 3
2. SAFETY PRECAUTIONS • Before installation or use, be sure to carefully read all the instructions in this section for correct and safe operation. • Be sure to follow all the precautionary instructions in this section, which contain important warnings and/or cautions regarding safety. • After reading, keep this manual handy for future reference.
PAGE 4
CAUTION Indicates a potentially hazardous situation which, if mishandled, could result in moderate or minor personal injury, and/or property damage. When Installing the Unit • Never plug in nor remove the power supply plug with wet hands, as doing so may cause electric shock. • When unplugging the power supply cord, be sure to grasp the power supply plug; never pull on the cord itself. Operating the unit with a damaged power supply cord may cause a fire or electric shock.
PAGE 5
3. GENERAL DESCRIPTION TOA's P-906MK2 (rated output: 60 W), P-912MK2 (120 W), and P-924MK2 (240 W) Power Amplifiers feature a high-impedance direct input terminal and an input port that permits the use of various optional plug-in modules. The most appropriate plug-in module can be selected depending on applications. The power amplifiers have a low-cut switch for a cutoff frequency of 60 Hz, and an input level switch for input sensitivity of 0 dBV (1 V) or –20 dBV (100 mV).
PAGE 6
5. NOMENCLATURE AND FUNCTIONS [Front] 3 • P-906MK2, P-912MK2 900 SERIES 4 5 6 7 AMPLIFIER P – 906MK2 NORMAL PEAK PROTECT POWER SIGNAL MASTER 2 1 ON OFF This figure represents the P-906MK2. 3 • P-924MK2 900 SERIES 4 5 6 7 AMPLIFIER P – 924MK2 SIGNAL NORMAL PEAK PROTECT POWER MASTER ON OFF 1 1. Power switch [ ON / OFF] Power is switched on and off with each depression of this switch. 5.
PAGE 7
[Rear] • P-906MK2, P-912MK2 8 9 10 70V DIRECT 4Ω 8Ω • P-924MK2 14 15 8 9 12 INPUT HOT 0dB – 20dB INPUT LEVEL COM 13 ON OFF LOW CUT 25V 11 12 COM This figure represents the P-906MK2. 10 11 CLASS 2 WIRING MAY BE USED. INPUT LOW CUT ON 70V OFF 25V 8Ω HOT INPUT LEVEL 0dBV COM COM –20dBV OT IN 4Ω 14 8. AC outlet (Unswitched) Provides AC power to auxiliary equipment with power consumption of less than 500 W. 9.
PAGE 8
6. INSTALLATION AND CONNECTIONS 6.1. Input Connections • Two types of input terminals are made available on the rear panel for input connections: Direct input terminal and plug-in module port. (1) Direct input terminal (HOT, COM) 0 dB (1 V) or –20 dBV (100 mV) switchable, 10 kΩ, unbalanced, 2P screw terminal. Line output of the external equipment can be connected directly to this terminal. (2) Plug-in module input Select a desired 900 series plug-in module depending on applications.
PAGE 9
6.2. Speaker Connections The unit has 25 V and 70 V outputs for constant voltage speaker system and low impedance output for 4 Ω or 8 Ω speaker loads. Two types of speaker output are available: transformer-balanced output and unbalanced direct output, which can be selected by the impedance selector switch (P-906MK2 and P-912MK2 only) or the jumper strip (P-924MK2 only) position. Connect the speaker system to only one of the speaker outputs.
PAGE 10
6.2.2. Connection to 4 Ω output (unbalanced direct output) • P-906MK2, P-912MK2 70V DIRECT 25V 4Ω 8Ω COM 4Ω Step 1. Loosen the screw. Step 2. Shift the impedance selector switch to "4 Ω" position. Step 3. Retighten the screw. • P-924MK2 70V 25V 8Ω COM OT IN 4Ω 10 Remove the jumper strip.
PAGE 11
7. RACK MOUNTING BRACKET ATTACHMENT Each Power Amplifier can be mounted in a standard 19" equipment rack with the addition of the optional rack mounting bracket MB-25B (P-906MK2 and P-912MK2) or MB-35B (P-924MK2). Step 1. Remove 4 plastic feet on the bottom surface when mounting the unit in a rack. Step 2. Remove four M4 x 8 screws on both sides of the unit. The removed screws are not used. SIG NA L NO RM AL MA ST ER PE PR OT EC T PO AK WE R ON OF F Step 3.
PAGE 12
8. OPERATION Be sure to complete all connections before operation. Step 1. Press the power switch to turn on the power. The power indicator lights green. The amplifier comes into operation about 5 seconds after the power has been switched on. Step 2. Adjust the master volume control for the optimum level. Turn the knob clockwise to increase the output level and counterclockwise to decrease it.
PAGE 13
10. DIMENSIONAL DIAGRAMS 10.1. P-906MK2, P-912MK2 358 (124.09) 17 (0.67) 320 (12.6) Unit: mm (inches) 482.6 (19) 466 (18.35) SIGNAL NORMAL PEAK PROTECT POWER MASTER ON OFF 99.1 (3.9) AMPLIFIER P – 906MK2 76.2 (3) 900 SERIES 88.4 (3.48) 420 (16.54) This figure represents the P-906MK2.
PAGE 14
10.2. P-924MK2 17 (0.67) 482.6 (19) 466 (18.35) 420 (16.54) PEAK PROTECT POWER MASTER ON OFF 14 151.3 (5.96) NORMAL 132.6 (5.22) SIGNAL (2.25) AMPLIFIER P – 924MK2 57.2 900 SERIES 334.2 (13.16) 298.5 (11.
PAGE 15
11. SPECIFICATIONS 11.1. P-906MK2, P-912MK2 Model No.
PAGE 16
11.2. P-924MK2 Power Source Rated Output Power Consumption Rated output Based on cUL standards Power Bandwidth Frequency Response Total Harmonic Distortion Input Input Sensitivity/Impedance Output Output Regulation (1 kHz) S/N Ratio (Band pass: 20 – 20,000 Hz) Control Indicator Protection Connector Operating Temperature Other Feature Color Dimensions Weight 120 V AC, 60 Hz (D): 240 W RMS, (T): 220 W RMS 120 V / 3 A 180 W (D): 20 – 20,000 Hz, 0.5% THD (T): 50 – 20,000 Hz, 0.