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Kramer Electronics VA-4 manual

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Table of contents for the manual

  • Page 1

    KRAMER ELECTRONICS LTD. USER MAN UAL MODEL: VA - 4 Dual C hanne l Balan ced St ere o Audio Amp lifie r P/N: 2900 - 00000 4 Rev 2A[...]

  • Page 2

    [...]

  • Page 3

    VA -4 – Con tent s i Conte nt s 1 Introduct ion 1 2 Getting S tarted 2 2.1 Achi eving the Best Performance 2 2.2 Safety In stru ction s 2 2.3 Recycl ing Kramer Product s 3 3 Overview 4 3.1 Defining t he VA - 4 Dual Channel Balanced Stereo Audio Amplifier 4 4 Connecting the VA -4 7 4.1 Connecti ng to the VA - 4 via RS - 232 8 5 Technical Spe cifi [...]

  • Page 4

    VA -4 - Introdu cti on 1 1 Intr oduction Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been providing a world of unique, creative, and affordabl e solutions to the vast range of problems that confront video, audio, pres entation, and broadcasting professional s on a daily basis. In recent years, we have redesigned and upgraded m[...]

  • Page 5

    2 VA -4 - Gettin g St arted 2 Getting Start ed We recommend that you: • Unpack the equipment careful ly and save the original box and packaging materials f or possible future shipment • Review the contents of this user manual • Use Kramer high performance high resolut ion cables Go to http://www.kramerelec tronics.com to check for up - to - d[...]

  • Page 6

    VA -4 - Gett ing St arte d 3 2.3 Recycling Kramer Products The Waste Electrical and Electronic Equipm ent (WEEE) Directive 2002/96/EC aims to reduce the amount of WEEE sent for disposal to landfill or incineration by requiring it to be collected and recycled. T o comply with the WEEE Direc tive, Kramer Electronics has made arrangem ents with the Eu[...]

  • Page 7

    4 VA -4 - Over view 3 Ove rvi ew The VA −4 is a volum e controller for two channels of balanced stereo audio signals on XLR connectors. The volume of each stereo channel can be adjusted independently of the other stereo channel . The VA -4 : • Features a digitally c ontrolled volume control f unction • Use s high quality low dist ortion audio[...]

  • Page 8

    VA -4 - Over view 5 VA -4 – Overvi ew 5 Fig ure 1 : VA -4 Dual Ch annel B alanc ed Stereo A udio Ampli fier F ront Pa nel # Feature Functi on 1 POWER Swi tch Ill uminat ed swi tch su pplyi ng pow er to t he unit 2 - Button Press to dec rease the level 3 + Button Press t o incr ease t he level 4 LEVEL 7- segment LED Di spla y S ho ws the g ain of [...]

  • Page 9

    6 VA -4 - Over view Fig ure 2 : VA -4 Dual Ch annel B alanc ed Stereo A udio Ampli fier Re ar Pan el # Feature Funct io n 8 CH.1 IN LE FT an d RIGH T XLR Fem ale Con nector s Conn ects to th e bala nced st ereo au dio source 1 9 CH.2 IN LE FT an d RIGH T XLR F emale Connect ors Conn ects to the b alance d st ereo au dio s ource 2 10 CH.1 OUT LEFT a[...]

  • Page 10

    VA -4 - Con necti ng t he V A -4 7 4 Connecti ng the VA -4 Always switch off the power to each device before connecting it to your VA -4 . After c onnecting your VA -4 , connect its power and then switch on the power to each device. To connect the VA -4 as illust rated in the example in Figure 3 : 1. Connect a balanced stereo audio source (for exam[...]

  • Page 11

    8 VA -4 - Con necti ng t he V A -4 Fig ure 3 : Conne ctin g the VA -4 Dual C hann el Bal anc ed Ster eo Audi o Am plifie r 4.1 Connecti ng to the V A - 4 via RS - 232 You can connect to the unit via a crossed RS - 232 connection, using for example, a PC. A crossed cable or null - modem is required as shown in method A and B respectively. If a shiel[...]

  • Page 12

    VA -4 - Con necti ng t he V A -4 9 Fig ure 4 : Crossed Cable RS - 232 C onnecti on Hardware flow control is not required for t his unit. In the rare case where a controll er requires hardware flow control, short pin 1 to 7 and 8, and pin 4 to 6 on the c ontroller side. Method B ( Fi gure 5 )— Connect the RS - 232 9 - pin D - sub port on the unit [...]

  • Page 13

    10 VA -4 - Tec hnical Spec ifica tions 5 Technical Specifications INPUTS: 2 balan ced stereo , up to 16dB m/33k Ω on female XLR connect ors OUTPUTS: 2 balan ced stereo , up to 21dBm/50 Ω on male XL R connect ors BANDW IDTH ( - 3dB): >100 kH z S/N RATIO: 80dB@ 6dB G ain ( unweig hted) CROSSTALK (a ll hostile): 74dB @1k Hz; - 68dB @20k Hz CONT[...]

  • Page 14

    VA -4 - Proto col 20 00 11 6 Protoc ol 2000 The VA -4 is com patible with Kramer’s Protocol 2000 (version 0.51). This RS - 232 / RS - 485 communicati on protocol uses four bytes of information as defined below. For RS - 232, a null - modem connection bet ween the machine and controller is used. The default data rate is 9600 baud, with no parity, [...]

  • Page 15

    12 VA -4 - Prot ocol 2000 VA - 4 Hex Co des fo r Gain Con trol (Att enua tion) Ga in (d B) LED Hex Code s Ga in (d B) LED Hex Code s Ga in (d B) LED Hex Code s - 40.7 - 166 16 81 80 81 - 27.0 - 110 16 81 b8 81 - 13.2 - 54 16 81 f0 81 - 40.4 - 165 16 81 81 81 - 26.7 - 109 16 81 b9 81 - 13.0 - 53 16 81 f1 81 - 40.2 - 164 16 81 82 81 - 26.5 - 108 16 8[...]

  • Page 16

    VA -4 - Proto col 20 00 13 VA - 4 Hex Co des fo r Gain Con trol (Am pli ficatio n) Ga in (d B) LED Hex Code s Ga in (d B) LED Hex Code s 0 0 3f 80 81 81 16 81 a 6 81 +11.0 45 3f 80 81 81 16 81 d3 81 +0.2 1 3f 80 81 81 16 81 a 7 81 +11.3 46 3f 80 81 81 16 81 d 4 81 +0.5 2 3f 80 81 81 16 81 a 8 81 +11.5 47 3f 80 81 81 16 81 d5 81 +0.7 3 3f 80 81 81 1[...]

  • Page 17

    14 VA -4 - Prot ocol 2000[...]

  • Page 18

    For the latest informat ion on our products and a list of Kramer d istributors, visit our Web sit e where updat es to this user manua l may be found. We w el come y o ur qu est i ons , com men t s , an d f eedb ack . Web site: E- mail: www.kramerelectron i cs.com info@k ramerel.com P/N: 2 9 0 0 - 0 0 0 0 0 4 Rev: 2A ! SAF ETY WAR NI NG Discon nect [...]