background image

APPENDIX: Line connections: unbalanced and balanced

There are two basic ways to transport an audio signal with microphone or line level:

Unbalanced line: Utilising a two conductor cable, it transports the signal as the voltage between them.

Electromagnetic interference can get added to the signal as undesired noise. Connectors that carry
unbalanced signals have two pins, such as RCA (Phono) and ¼” (6.35mm, often referred to as jack) mono. 3
pin connector such as XLR (Cannon) may also carry unbalanced signals if one of the pins is unused.

Balanced line: Utilising a three conductor cable, one of them acts as a shield against electromagnetic

noise and is the ground conductor. The other two have the same voltage with respect to the ground
conductor but with opposite signs. The noise that cannot be rejected by the shield affects both signal
conductors in the same way. At the device’s input the two signals get summed with opposite sign, so that
noise is cancelled out while the programme signal doubles in level. Most professional audio devices use
balanced inputs and outputs. Connectors that can carry balanced signal have three pins, such as XLR
(Cannon) and ¼” (6.35mm) stereo.

The graphs that follow show the recommended connection with different types of connectors to balanced

processor or amplifier inputs. The connectors on the left-hand side come from a signal source, and the ones
on the right hand side go to the inputs of the processor or amplifier. Note that on the unbalanced connectors
on the left-hand side, two terminals are joined inside the connector. If hum occurs with balanced to balanced
connections, try disconnecting the sleeve (ground) on the input connector. Note that the illustrations show
what should be connected to what, but that pin locations on an actual XLR connector are different. Also, pin
2 hot is assumed on XLR connectors.

13

EN

Manual del Usuario

/

serie avant

/

User’s Manual

Summary of Contents for Avant 12A

Page 1: ...utilizar el equipo lea la secci n Precauciones de seguridad de este manual Conserveestemanualparafuturasconsultas Before operating the device please read the Safety precautions section of this manual...

Page 2: ...avant...

Page 3: ...re 15 C y 42 C con una humedad relativa m xima del 95 con un rango de 10 de la tensi n nominal de alimentaci n indicada en la etiqueta trasera seg n IEC 60065 2001 Working temperature ranges from 15 C...

Page 4: ...a es imprescindible que el producto no haya sido previamente manipulado e incluir una fotocopia de la factura de compra GARANT A All D A S products are warrantied against any manufacturing defect for...

Page 5: ...002 95 CE Directiva RAEE WEEE 2002 96 CE Y es conforme a las siguientes Normas Armonizadas Europeas In accordance with Harmonized European Norms l l l EN 60065 2002 Audio video and similar electronic...

Page 6: ...Manual del Usuario serie avant User s Manual...

Page 7: ...SPECIFICATIONS APPENDIX 13 General information Preliminary ON OFF Overload indicators Overheating Equalisation Low mains voltage Line connections unbalanced and balanced 6 RIGGING 7 8 10 11 11 12 ava...

Page 8: ...EN Manual del Usuario serie avant User s Manual...

Page 9: ...N other blue LED indicates ON at the unit front LEVEL Potentiometer for adjusting the unit level MONITOR MAIN Knob for switching between two types of frequency response see graphs Press the knob to us...

Page 10: ...ctor just like the LOOP THRU connector with the following pin assignments MIC LINE Knob for switching between microphone and line sensitivities FUSE Fuse holder Use only the recommended fuse type and...

Page 11: ...SIGNAL Green LED indicates signal presence ON Blue LED indicates that the unit is ON SUB LEVEL Potentiometer for adjusting the unit level 1 2 3 4 5 6 avant 18A amplifier WARNING TO REDUCE RISK OF FIRE...

Page 12: ...are regained the unit will switch back on automatically Overheating This equipment does not normally overheat during normal conditions of use When overheating occurs the unit protects itself You shou...

Page 13: ...of the enclosure to free a rigging point Fix a M10 eyebolt in each point Note that each rigging point has 200 kg 440 lb working load limit Then choose the slings or chains of required load resistance...

Page 14: ...is ideal for applications such as presentations A V etc avant avant 12A 18A Configuration 2 or two subwoofers and two avant avant avant avant 12A 15A 18A 12A Basic configuration with two used as stag...

Page 15: ...in live events Dj s etc avant avant 215A 18A Configuration 4 Typical configuration using systems for live events avant Note The units should be paralleled using the SATELLITE OUTPUT in the THRU posit...

Page 16: ...ge is out of range SOLUTION 1 Check that the mixer or sound source is sending signal to the UNIT 2 Check that the cable from the sound source to the UNIT is connected correctly Replace the cable if de...

Page 17: ...215A ALL DIMENSIONS IN MILIMETERS 540 650 630 avant avant avant 12A 15A 215A avant 18A DSP LINEAR PROCESSING LOW LOW MAIN MAIN OUTPUT B OUTPUT A LF LF x2 for avant 215A HF HIGH Switching Power Supply...

Page 18: ...8 dBu Mic 20 mV 32dBu Line 1 95V 8dBu Frequency Range 10 dB 60 Hz 20 kHz EQ main 45 Hz 20 kHz EQ flat 40 Hz 20 kHz EQ flat 35 Hz 160 Hz variable X over 3 Maximum Peak SPL at 1 m 133 dB 133 dB 136 dB...

Page 19: ...the same way At the device s input the two signals get summed with opposite sign so that noise is cancelled out while the programme signal doubles in level Most professional audio devices use balance...

Page 20: ...14 EN Manual del Usuario serie avant User s Manual...

Page 21: ......

Page 22: ...DAS4USA Tel 1 305 436 0521 Fax 1 305 436 0528 D A S AUDIO ASIA PTE LTD 25 Kaki Bukit Crescent 01 00 02 00 Kaki Bukit Techpark 1 Singapore 416256 Tel 65 6742 0151 Fax 65 6742 0157 D A S AUDIO S A C Isl...

Reviews: