9. The outputpower of an amplifier

10. Delivers i.e. Rated output- 600 W

11. Music signals look different...

12. 600 W... to sinewaves. Power is not sufficient.

13. 600 W What to do? Reduce gain ?

14. 600 W No. Better buy a DYNACORD amplifier...

15. 600 W And here is what you get:

16. 600 W

17. 780 W 30 % Headroom !

18. S 900 S 1200

19. 2 Power Ranges S 900 = 2 x 450 W / 4 Ohm S 1200 = 2 x 600 W / 4 Ohm

20. Positioning

21. Features  Highly Competitive Pricing  Excellent Audio Performance  Full Protection Package

22.  Active balanced Inputs  Direkt-Outs (Loop)  Bridge Mode (with separate SPEAKON-Output)  Ground-Lift-Switch  2 Ohm operation possible

23. 15 kg 16 kg

27. X The powersection as well as the transformer(s) of poweramps need reliable protection to prevent damage of the unit.

28. All DYNACORD and ELECTRO-VOICE Power-Amplifiers provide thermal control and dedicated protection of the heat-sinks as well as of the transformer(s).

29. DC at the output of amplifiers will blow the voicecoils of connected speakers !

30. All DYNACORD Power-Amplifiers provide reliable protection against DC at the output

31. X HF at the output of amplifiers will blow the voicecoils of connected speakers !

32. All DYNACORD Power-Amplifiers provide reliable protection against High Frequency at the output

33. Defective cables or defective speakers may cause short circuits at the poweramp‘s output(s)

37. All DYNACORD Power-Amplifiers provide reliable protection against damage due to short circuits at the output

38. No speakers connected ?

39. No Problem !

41. Connect any (i.e. 15-3 way) speaker cabinet to any power amplifier.

42. The cabinet with its crossover represents a reactive load to the amplifier and sends a (normally small) part of the energy back into the amp.

43. This phenomenon is called Electro Motive Force

44. In case that i.e. the crossover or a speaker is defective the BACK-EMF may become very high and can damage the power transistors of the amplifier

45. Audio Performance

46. The THD+N versus frequency test routine is used in order to determine the amount of Total Harmonic Distortion + Noise versus the frequency at rated output power.

47. This measurement gives information about the linearity of the power amp.

51. The IMD-SMPTE test routine is used in order to determine the amount of Distortion generated by the non-linear products of the test signal.

52. This measurement gives most critical information about the amplifiers linearity related to complex musical wave forms.

53. The DIM 30 test routine is used in order to determine the amount of DYNAMIC INTERMODULATION distortion using a composite square-sine-wave band limited to 30 kHz.

54. This measurement gives information about the amplifiers „speed“

56. Power Supply Rail of the amplifier

57. Example

58. Limiter Circuit detects distortion and controls gain

61. Distortion is now at threshold level (1%) or below

62. The dynamic limiting control process takes 3 ms, only

63. This measurement shows the response of the dynamic limiters

64. The limiters keep the signal within the 1% THD range as specified ZOOM

65. Same signal without dynamic limiters

67. One channel of the amplifier shown here.

68. INPUT Signal AMPLIFIER

69. The limiters get controlled by means of APC AUDIO PROCESSOR CONTROL

70. APC constantly monitors the input-signal...

71. ... and the output-signal

72. APC monitors Input- versus Output-Signal...

73. ... and -in case of nonlinear operating conditions- activates the limiter.

74. Monitors CURRENT versus POWER SUPPLY RAIL...

75. ... activates the Peak Current Limiter and controls the audio limiter to prevent any clipping signal to be fed into the connected speakers.

76. TBC monitors ENERGY- versus TIME...

77. ... thus simulates the thermal behaviour of the voicecoil...

78. ... and controls the limiters accordingly. DC: P-1050 X + Xa/PM- Amps EV: P-1250 and Px-Amps only !

79. Linear Precision P-Series Procesed Precision Standard Precision Q-Series Xa-Series X-Amps DPA-Series