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Introduction 

 

1

1 Introduction 

Dedication by Kramer Electronics since 1981, to the development and 
manufacture of high quality video/audio equipment, makes the Kramer line 
an integral part of the finest production and presentation facilities in the 
world. In recent years, Kramer has redesigned and upgraded most of the line, 
making the best even better! The Kramer line of professional video/audio 
electronics is one of the most versatile and complete available, and is a true 
leader in terms of quality, workmanship, price/performance ratio and 
innovation. In addition to our high quality distribution amplifiers, we also 
offer excellent switchers and matrices, remote controllers, processors, 
interfaces and computer-related products. 

Congratulations on purchasing your Kramer VA-4 Dual Channel Balanced 
Stereo Audio Amplifier
. The VA-4 is useful in applications where the gain in 
the front-end or back-end of an audio device needs to be controlled, but the 
device does not have such control. It is ideal for recording studios and 
broadcast studios for on-line signal distribution. The package includes the 
following items: 

• 

VA-4 Dual Channel Balanced Stereo Audio Amplifier 

• 

Null-modem adapter 

• 

Windows®-based control software 

• 

Power cord 

• 

This user manual

1

 and the Kramer concise product catalog/CD 

2 Getting 

Started 

We recommend that you: 

• 

Unpack the equipment carefully and save the original box and packaging 

materials for possible future shipment 

• 

Review the contents of this user manual 

• 

Use Kramer high performance high resolution cables

2

 

3 Overview 

The VA-4 is a dual channel balanced stereo audio amplifier using XLR 
connectors for all audio inputs and outputs. In particular, the VA-4

• 

Features a digitally controlled volume control function 

                                                        

1 Download up-to-date Kramer user manuals from the Internet at this URL: http://www.kramerelectronics.com/manuals.html 

2 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com (click “Cables and Connectors” 

in the Products section) 

Содержание VA-4

Страница 1: ...Kramer Electronics Ltd USER MANUAL Model VA 4 Dual Channel Balanced Stereo Audio Amplifier ...

Страница 2: ...Figure 2 Connecting the VA 4 Dual Channel Balanced Stereo Audio Amplifier 3 Figure 3 Connecting a PC without using a Null modem Adapter 4 Tables Table 1 Front Panel VA 4 Dual Channel Balanced Stereo Audio Amplifier Features 2 Table 2 Rear Panel VA 4 Dual Channel Balanced Stereo Audio Amplifier Features 3 Table 3 VA 4 Dual Channel Balanced Stereo Audio Amplifier Technical Specifications 4 Table 4 V...

Страница 3: ...end of an audio device needs to be controlled but the device does not have such control It is ideal for recording studios and broadcast studios for on line signal distribution The package includes the following items VA 4 Dual Channel Balanced Stereo Audio Amplifier Null modem adapter Windows based control software Power cord This user manual1 and the Kramer concise product catalog CD 2 Getting St...

Страница 4: ...g electrical appliances that may adversely influence signal quality and positioning your Kramer VA 4 away from moisture excessive sunlight and dust 4 Your VA 4 Dual Channel Balanced Stereo Audio Amplifier Figure 1 Table 1 and Table 2 define the front and rear panels of the VA 4 Figure 1 VA 4 Dual Channel Balanced Stereo Audio Amplifier Table 1 Front Panel VA 4 Dual Channel Balanced Stereo Audio Am...

Страница 5: ...1 1 Connect a balanced stereo audio source for example a set top box source 1 to the left and right channel 1 IN XLR connectors 2 Connect a balanced stereo audio source source 2 to the left and right channel 2 IN XLR connectors 3 Connect the left and right channel 1 OUT XLR connectors to a balanced stereo audio acceptor acceptor 1 4 Connect the left and right channel 2 OUT XLR connectors to a bala...

Страница 6: ...l modem Adapter 6 Technical Specifications Table 3 includes the technical specifications Table 3 VA 4 Dual Channel Balanced Stereo Audio Amplifier Technical Specifications 1 INPUTS 2 balanced stereo 2 9Vpp on female XLR connectors OUTPUTS 2 balanced stereo on male XLR connectors MAX OUTPUT LEVEL 14Vpp for GAIN 1 26Vpp for GAIN 12 5 maximum BANDWIDTH 3dB 100 kHz S N RATIO 80dB 6dB Gain unweighted C...

Страница 7: ... 2 in steps of 1 send hex bytes 18 82 80 81 To decrement the gain of channel 2 in steps of 1 send hex bytes 18 82 81 81 3 To request the gain of channel 1 send hex codes 19 81 80 81 The response will be as per Table 4 and Table 5 except that 59 will be sent instead of the constant byte 16 and 7f instead of the constant byte 3f 4 To request the gain of channel 2 send hex codes 19 82 80 81 In Table ...

Страница 8: ...6 9 28 3f 80 81 81 16 81 8a 81 34 1 139 16 81 9b 81 20 3 83 16 81 d3 81 6 6 27 3f 80 81 81 16 81 8b 81 33 8 138 16 81 9c 81 20 1 82 16 81 d4 81 6 4 26 3f 80 81 81 16 81 8c 81 33 6 137 16 81 9d 81 19 8 81 16 81 d5 81 6 1 25 3f 80 81 81 16 81 8d 81 33 3 136 16 81 9e 81 19 6 80 16 81 d6 81 5 9 24 3f 80 81 81 16 81 8e 81 33 1 135 16 81 9f 81 19 4 79 16 81 d7 81 5 6 23 3f 80 81 81 16 81 8f 81 32 8 134 ...

Страница 9: ... 20 3f 80 81 81 16 81 ba 81 15 9 65 3f 80 81 81 16 81 e7 81 5 1 21 3f 80 81 81 16 81 bb 81 16 2 66 3f 80 81 81 16 81 e8 81 5 4 22 3f 80 81 81 16 81 bc 81 16 4 67 3f 80 81 81 16 81 e9 81 5 6 23 3f 80 81 81 16 81 bd 81 16 7 68 3f 80 81 81 16 81 ea 81 5 9 24 3f 80 81 81 16 81 be 81 16 9 69 3f 80 81 81 16 81 eb 81 6 1 25 3f 80 81 81 16 81 bf 81 17 2 70 3f 80 81 81 16 81 ec 81 6 4 26 3f 80 81 81 16 81 ...

Страница 10: ...quired the original dated invoice or a copy must be presented as proof of warranty coverage and should be included in any shipment of the product Please also include in any mailing a contact name company address and a description of the problem s 3 For the name of the nearest Kramer authorized service center consult your authorized dealer LIMITATION OF IMPLIED WARRANTIES All implied warranties inc...

Страница 11: ... E mail info kramerel com P N 2900 000004 REV 2 For the latest information on our products and a list of Kramer distributors visit our Web site www kramerelectronics com Updates to this user manual may be found at http www kramerelectronics com manuals html We welcome your questions comments and feedback ...

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