User manual JBL MPA23

[. . . ] MPA Series Power Amplifiers Owner's Manual Clip Clip -10dB Protect -20dB MPA275 Professional Amplifier -10dB -20dB Signal Present 10 Power Signal Present 10 12 14 8 6 14 12 8 6 18 4 18 4 24 48 0 2 24 2 48 0 1-CHANNEL-2 MPA275 Clip Clip -10dB Protect -20dB MPA400 Professional Amplifier -10dB -20dB Signal Present 10 Power Signal Present 10 12 14 8 6 14 12 8 6 18 4 18 4 24 48 0 2 24 2 48 0 1-CHANNEL-2 MPA400 Clip Clip -10dB Protect -20dB MPA600 Professional Amplifier -10dB -20dB Signal Present 10 Power Signal Present 10 12 14 8 6 14 12 8 6 18 4 18 4 24 48 0 2 24 2 48 0 1-CHANNEL-2 MPA600 MPA750 Professional Amplifier Clip -10dB -20dB Signal Present 10 Clip -10dB Protect -20dB Power Signal Present 10 12 14 8 6 14 12 8 6 18 4 18 4 24 48 0 2 24 2 48 0 1-CHANNEL-2 MPA750 MPA1100 Professional Amplifier Clip -10dB -20dB Signal Present 10 Clip -10dB Protect -20dB Power Signal Present 10 12 14 8 6 14 12 8 6 18 4 18 4 24 48 0 2 24 2 48 0 1-CHANNEL-2 MPA1100 Cautions Rack Mounting Precautions To avoid damage to the amplifier mounting ears and/or rack rails, the amplifier must be supported at all four corners when used in portable racks. Consult JBL Service Dept for availability of Rear Support Brackets. Sicherheitsvorschriften Sicherheitsvorschriften für den Einbau in ein Gestell Um Schäden auf den Befestigungsleisten des Verstärkers und/oder den Gestellschienen zu vermeiden, muß der Verstärker beim Einbau in ein tragbares Gestell an allen vier Ecken gestützt werden. Erkundigen Sie sich bei der JBLKundendienstabteilung nach Stützen für die Rückseite des Verstärkers. Lifting Precautions In order to safely move or install the amplifier, it is recommended that two persons share the weight when lifting and positioning the unit. Sicherheitsvorschriften beim Hochheben Um den Verstärker sicher zu verschieben oder einzubauen, wird empfohlen, das Gewicht des Verstärkers beim Hochheben und Verschieben gleichmäßig auf zwei Personen zu verteilen. VORSICHT UM ELEKTRISCHEN SCHLAG ZU VERMEIDEN, KEINE FINGERN ODER GEGENSTÄNDE IN ÖFFNUNGEN DES GEHÄUSES STECKEN. CAUTION TO AVOID ELECTRIC SHOCK, DO NOT INSERT FINGERS OR OBJECTS INTO ANY OPENINGS IN THE CABINET. WARNING: TO P R E V E N T F I R E O R E L E C T R I C SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. WARNUNG: ZUR VERMEIDUNG VON FEUER ODER ELEKTRISCHEN SCHLÄGEN DAS GERÄT NICH MIT REGEN ODER FEUCHTIGKEIT IN BERÜHRUNG BRINGEN. Explanation of Graphical Symbols The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to humans. [. . . ] All major safety agencies around the world measure amplifier current and temperature rise under the same "normal operating conditions" using a pink noise signal with an average power equal to one eighth of maximum power. This was in response to industry complaints that the former test level of one third power was unrealistic for high-quality professional amplifiers. To put these levels in perspective, music played at one third average power will be in a state of constant clipping, and this power level is about the greatest one can obtain without completely obliterating the program under clipping. The one eighth power level is about as loud as you can play music while making some attempt to avoid obvious clipping. We had to satisfy the following conditions: 1. Meet the safety agency requirements for "normal" current draw. Remain within the functional limits of the plug for "severe program levels. " Avoid unsafe conditions at full output power. The AC consumption for each power level and load impedance is shown in Table 1 and Table 2 (see pages 9 and 10). The safety agencies are concerned with the current levels shown under the one eighth power column. This is because building codes prohibit the connection of a single load which exceeds 80% of the capacity of the branch circuit. JBL Engineering standards call for ability to operate at one third power, in order to meet the demands of "worst-case" heavily compressed, clipped program material. This will use the AC current shown in the one third power column. The amplifier's protective circuits will not permit long-term operation at full power into 2 ohms. 9 Operation Operation With 110 VAC, 60 Hz Power Mains 2 CH Load Max Power AC Current Model (Ohms) (Midband) Full Power MPA1100 MPA750 MPA600 MPA400 MPA275 8+8 4+4 2+2 8+8 4+4 2+2 8+8 4+4 2+2 8+8 4+4 2+2 8+8 4+4 2+2 740 1000 1300 480 700 950 400 550 675 275 400 525 180 275 425 x x x x x x x x x x x x x x x 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 23. 0 38. 0 54. 0 18. 0 29. 0 38. 0 15. 2 22. 0 32. 0 11. 2 16. 0 22. 0 7. 6 12. 0 18. 2 A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A AC Current 1/3 Power 10. 2A 16. 0 A 23. 0 A 9. 6A 14. 4 A 21. 0 A 8. 4 A 13. 5 A 15. 2 A 6. 6 A 9. 6 A 13. 2 A 5. 4 A 7. 2 A 11. 2 A 10. 4 A 16. 6 A 23. 4 A 9. 8A 14. 8 A 21. 4 A 8. 6 A 13. 4 A 15. 6 A 6. 8 A 9. 8 A 13. 6 A 5. 6 A 7. 6 A 11. 6 A AC Current 1/8 Power 5. 4 7. 8 11. 4 4. 6 6. 4 10. 0 3. 4 5. 4 8. 0 2. 6 4. 6 5. 4 3. 6 5. 2 7. 0 5. 6 8. 0 11. 8 4. 8 6. 8 10. 6 3. 6 5. 6 8. 6 2. 8 4. 8 5. 6 3. 8 5. 6 7. 4 A A A A A A A A A A A A A A A A A A A A A A A A A A A. A A A AC Current Idle 0. 9 A 0. 7 A 0. 5 A 0. 4 A 0. 4 A Operation With 115 VAC, 60 Hz Power Mains 8+8 770 x 2 24. 0 MPA1100 4+4 1100 x 2 39. 0 2+2 1400 x 2 56. 0 8+8 510 x 2 18. 6 MPA750 4+4 760 x 2 30. 0 2+2 1000 x 2 39. 4 8+8 425 x 2 13. 6 MPA600 4+4 610 x 2 23. 0 2+2 750 x 2 33. 0 8+8 290 x 2 11. 6 MPA400 4+4 425 x 2 17. 0 2+2 575 x 2 23. 0 8+8 190 x 2 7. 8 MPA275 4+4 300 x 2 13. 6 2+2 450 x 2 19. 2 Operation With 120 VAC, 60 Hz Power Mains 8+8 800 x 2 25. 0 MPA1100 4+4 1200 x 2 40. 0 2+2 1500 x 2 58. 0 8+8 550 x 2 19. 0 MPA750 4+4 825 x 2 31. 0 2+2 1100 x 2 41. 0 8+8 450 x 2 16. 0 MPA600 4+4 675 x 2 24. 0 2+2 825 x 2 34. 0 8+8 300 x 2 12. 0 MPA400 4+4 450 x 2 18. 0 2+2 650 x 2 24. 0 8+8 200 x 2 8. 0 MPA275 4+4 325 x 2 13. 0 2+2 500 x 2 20. 0 1. 0 A 0. 8 A 0. 6 A 0. 4 A 0. 4 A A A A A A A A A A A A A A A A 10. 8 17. 0 24. 0 10. 0 15. 2 22. 0 9. 0 14. 0 16. 0 7. 0 10. 0 14. 0 6. 0 8. 0 12. 0 A A A A A A A A A A A A A A A 5. 8 8. 4 12. 0 5. 0 7. 4 11. 0 4. 0 6. 0 9. 0 3. 0 5. 0 6. 0 4. 0 6. 0 8. 0 A A A A A A A A A A A A. A A A 1. 0 A 0. 8 A 0. 6 A 0. 4 A 0. 4 A Table 1. JBL MPA-Series AC Power Consumption vs Load Impedance With 110, 115 and 120V Mains 10 Operation Operation With 220 VAC, 50 Hz Power Mains 2 CH Load Max Power AC Current Model (Ohms) (Midband) Full Power MPA1100 MPA750 MPA600 MPA400 MPA275 8+8 4+4 2+2 8+8 4+4 2+2 8+8 4+4 2+2 8+8 4+4 2+2 8+8 4+4 2+2 740 1000 1300 480 700 950 400 550 675 275 400 525 180 275 425 x x x x x x x x x x x x x x x 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 11. 5 19. 0 27. 0 9. 0 14. 5 19. 0 7. 6 11. 0 16. 0 5. 6 8. 0 11. 0 3. 8 6. 0 9. 1 A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A AC Current 1/3 Power 5. 1A 8. 0 A 11. 5 A 4. 8A 7. 2 A 10. 5 A 4. 2 A 6. 5 A 7. 6 A 3. 3 A 4. 8 A 6. 6 A 2. 7 A 3. 6 A 5. 6 A 5. 2 A 8. 3 A 11. 7 A 4. 9A 7. 4 A 10. 7 A 4. 3 A 6. 7 A 7. 8 A 3. 4 A 4. 9 A 6. 8 A 2. 8 A 3. 8 A 5. 8 A AC Current 1/8 Power 2. 7 3. 9 5. 7 2. 3 3. 2 5. 0 1. 7 2. 7 4. 0 1. 3 2. 3 2. 7 1. 8 2. 6 3. 5 2. 8 4. 0 5. 9 2. 4 3. 4 5. 3 1. 8 2. 8 4. 3 1. 4 2. 4 2. 8 1. 9 2. 8 3. 7 A A A A A A A A A A A A A A A A A A A A A A A A A A A. A A A AC Current Idle 0. 5 A 0. 4 A 0. 3 A 0. 2 A 0. 2 A Operation With 230 VAC, 50 Hz Power Mains 8+8 770 x 2 12. 0 MPA1100 4+4 1100 x 2 19. 5 2+2 1400 x 2 28. 0 8+8 510 x 2 9. 3 MPA750 4+4 760 x 2 15. 0 2+2 1000 x 2 19. 7 8+8 425 x 2 7. 8 MPA600 4+4 610 x 2 11. 5 2+2 750 x 2 16. 5 8+8 290 x 2 5. 8 MPA400 4+4 425 x 2 8. 5 2+2 575 x 2 11. 5 8+8 190 x 2 3. 9 MPA275 4+4 300 x 2 6. 3 2+2 450 x 2 9. 6 Operation With 240 VAC, 50 Hz Power Mains 8+8 800 x 2 12. 5 MPA1100 4+4 1200 x 2 20. 0 2+2 1500 x 2 29. 0 8+8 550 x 2 9. 5 MPA750 4+4 825 x 2 15. 5 2+2 1100 x 2 20. 5 8+8 450 x 2 8. 0 MPA600 4+4 675 x 2 12. 0 2+2 825 x 2 17. 0 8+8 300 x 2 6. 0 MPA400 4+4 450 x 2 9. 0 2+2 650 x 2 12. 0 8+8 200 x 2 4. 0 MPA275 4+4 325 x 2 6. 5 2+2 500 x 2 10. 0 0. 5 A 0. 4 A 0. 3 A 0. 2 A 0. 2 A A A A A A A A A A A A A A A A 5. 4 8. 5 12. 0 5. 0 7. 6 11. 0 4. 5 7. 0 8. 0 3. 5 5. 0 7. 0 3. 0 4. 0 6. 0 A A A A A A A A A A A A A A A 2. 9 4. 2 6. 0 2. 5 3. 7 5. 5 2. 0 3. 0 4. 5 1. 5 2. 5 3. 0 2. 0 3. 0 4. 0 A A A A A A A A A A A A. A A A 0. 5 A 0. 4 A 0. 3 A 0. 2 A 0. 2 A Table 2. JBL MPA-Series AC Power Consumption vs Load Impedance With 220, 230 and 240V Mains 11 Operation Controls The front-mounted Gain controls have 11 detents for easy matching of levels. The Gain scale shows dB of attenuation from full gain, with positions for 0 (full), -2, -4, -6, -8, -10, -12, -14, 18, -24, and (full off). Attenuation is accurate within 1 dB (down to -14 dB). Gain Control Lockout Provided with each amplifier are two lockout knob caps. Carefully remove the Gain control knob (A), as shown in Figure 9. [. . . ] If reducing Gain to zero does not release muting, the channel is defective or overheated (see below). If reducing Gain releases the muting, advance Gain slowly while watching the LEVEL displays (in case there is an abnormal signal which could blow the speakers). No sound is heard: A. If the LEVEL displays are active, (1) the speaker is open (blown), (2) there is an open circuit in the speaker wiring, or (3) there is an open circuit in the internal output wiring of the amplifier. (Consult a JBL dealer for service. ) If there is no LEVEL (SIGNAL PRESENT, -20dB, -30dB) or CLIP displays, (1) there is no input signal, or (2) the ribbon cable to the input module may not be seated well. [. . . ]