Kramer VP-774A User manual

KRAMER ELECTRONICS LTD.
USER MANUAL
MODEL:
VP-774AMP
Presentation Switcher/Scaler
P/N: 2900-300324 Rev 2

VP-774AMP – Contents
i
Contents
1Introduction 1
2Getting Started 2
2.1 Achieving the Best Performance 2
2.2 Safety Instructions 2
2.3 Recycling Kramer Products 3
3Overview 4
3.1 HDCP Compliance 7
3.2 About HDBaseT™ Technology 7
3.3 Using Twisted Pair Cable 7
3.4 Defining the VP-774AMP Presentation Switcher/Scaler 7
4Installing in a Rack 11
5Connecting the VP-774AMP 12
5.1 Wiring the RJ-45 Connectors 15
5.2 Connecting the Balanced Stereo Audio Output 16
5.3 Microphone Pinout 16
5.4 Audio Input Pinout 16
6The OSD Menu 17
6.1 OSD Menu Operation Example 17
6.2 The Input Menu 20
6.3 The Audio Menu 27
6.4 The Process Menu 33
6.5 The Picture Menu 34
6.6 The Enhance Menu 35
6.7 The Scale Menu 36
6.8 The Miscellaneous Menu 39
7The Display Modes 45
7.1 The Single Window Display Mode 45
7.2 The Dual Window Display Mode 45
8Controlling the VP-774AMP 50
8.1 Controlling via the Front Panel Buttons 50
8.2 Controlling via the OSD Menu 50
8.3 Controlling via the VP-774AMP Web Pages 51
8.4 Controlling via the Infrared Remote Control Transmitter 56
9Using the Embedded Web Pages 58
9.1 The Routing and Scaling Page 60
9.2 The Device Settings Page 70
9.3 The Input Settings Page 76
9.4 The Enhance Page 79
9.5 The Output Settings 80
9.6 The Audio Settings Page 81
9.7 The RS-232 over TP Page 84
9.8 The Emergency Alert System Page 88
9.9 The Security Page 90
9.10 The About Us Page 91
9.11 Save or Upload a Configuration 91
10 Port Tunneling 93
11 Flash Memory Upgrade 95

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VP-774AMP - Contents
12 Technical Specifications 96
12.1 Default Communication Parameters 97
12.2 Input Resolutions 97
12.3 Output Resolutions 99
13 The VP-774AMP RS-232 Communication Protocol 100
13.1 Using the Communication Protocol 100
13.2 Communication Protocol: Mimicking OSD 100
13.3 Protocol Table: Mimicking Remote and Front Panel Buttons 110
13.4 The Protocol 3000 Common Operation Commands 111
Figures
Figure 1: VP-774AMP Presentation Switcher/Scaler Front Panel 8
Figure 2: VP-774AMP Presentation Switcher/Scaler Rear Panel 9
Figure 3: 15-pin HD Connector Pinout 12
Figure 4: Connecting the VP-774AMP Presentation Switcher/Scaler 14
Figure 5: TP PINOUT 15
Figure 6: Connecting the Balanced Stereo Audio Output 16
Figure 7: Connecting an Unbalanced Stereo Audio Acceptor to the Balanced Output 16
Figure 8: Microphone Pinout 16
Figure 9: Audio Input Pinout 16
Figure 10: Input Menu 20
Figure 11: Select the Display Mode 22
Figure 12: Changing the Size of the Window 23
Figure 13: Increasing the Width 24
Figure 14: Increasing the Height 24
Figure 15: Positioning the Window 25
Figure 16: Window Customization 25
Figure 17: H-Position Slide Bar 26
Figure 18: Moving the PiP Window 26
Figure 19: Audio Menu 27
Figure 20: Set the Output Volume Level 29
Figure 21: SDI Channeling Example 30
Figure 22: The SDI Channeling Menu 30
Figure 23: SDI Channeling Example 31
Figure 24: SDI bypassed Channels Menu 32
Figure 25: Process Menu 33
Figure 26: Picture Menu 34
Figure 27: Enhance Menu 35
Figure 28: Scale Menu 36
Figure 29: Misc Menu 39
Figure 30: XML File Transfer 43
Figure 31: Emergency Alert System Display 43
Figure 32: CV superimposed over DP 48
Figure 33: Entering the IP Number in the Address Bar 51
Figure 34: Local Area Connection Properties Window 53
Figure 35: Internet Protocol Version 4 Properties Window 54
Figure 36: Internet Protocol Version 6 Properties Window 54
Figure 37: Internet Protocol Properties Window 55
Figure 38: Infrared Remote Control Transmitter 56
Figure 39: The Authentication Window 58
Figure 40: The Loading Page 59
Figure 41: The Routing & Scaling Page with Web page list on the left 60

VP-774AMP – Contents
iii
Figure 42: The Routing & Scaling Page –Single Window 60
Figure 43: The Routing & Scaling Page –Moving the PIP Window 61
Figure 44: The Routing & Scaling Page –PIP Window 62
Figure 45: The Routing & Scaling Page –Changing the Resolution 63
Figure 46: The Routing & Scaling Page –The Swap Inputs 64
Figure 47: The Routing & Scaling Page –Swapping the Inputs 64
Figure 48: The Routing & Scaling Page –Auto Switching Window (Main Tab) 65
Figure 49: The Routing & Scaling Page –selecting the Inputs to Scan (PiP Tab) 65
Figure 50: The Routing & Scaling Page –Auto Switching Window 66
Figure 51: The Routing & Scaling Page –Lower Buttons Bar 66
Figure 52: The Routing & Scaling Page –Selecting a Preset 67
Figure 53: The Routing & Scaling Page –Saving the selected Preset 67
Figure 54: The Routing & Scaling Page –Recalling a Preset 68
Figure 55: The Routing & Scaling Page –TAKE Mode 68
Figure 56: The Routing & Scaling Page –Cancel the Changes 69
Figure 57: The Routing & Scaling Page –Audio Level Sliders 69
Figure 58: The Routing & Scaling Page –Muting the Audio Level 69
Figure 59: The Device Settings Page 70
Figure 60: The Device Settings Page –Changing the IP number 70
Figure 61: The Device Settings Page –Selecting the Firmware File 71
Figure 62: The Device Settings Page –Firmware File Downloaded 71
Figure 63: The Device Settings Page –Firmware Upgrade Warning 72
Figure 64: The Device Settings Page –Firmware Upgrade Stage 72
Figure 65: The Device Settings Page –Writing the Firmware 73
Figure 66: The Device Settings Page –Firmware Upgrade Waiting for Restart 73
Figure 67: The Device Settings Page –The Reset Device Window 74
Figure 68: The Device Settings Page –The Reset Device Window Including Ethernet 74
Figure 69: The Device Settings Page –Web Page Reset 75
Figure 70: The Device Settings Page –The Information Window 75
Figure 71: The Input Settings Page 76
Figure 72: The Input Settings Page –PIP Window Inactive 77
Figure 73: The Enhance Page 79
Figure 74: The Output Settings Page 80
Figure 75: The Audio Settings Page –General Tab 81
Figure 76: The Audio Settings Page –Microphones Tab 82
Figure 77: The Audio Settings Page –Microphones Tab 82
Figure 78: The Audio Settings Page –Setting the Mix Level 83
Figure 79: The Audio Settings Page –Output Volume Pre-limiter 83
Figure 80: The RS-232 over TP Page 84
Figure 81: The RS-232 over TP Page –the Remote Device Commands Table 85
Figure 82: The RS-232 over TP Page –the Edit Command Window 85
Figure 83: The RS-232 over TP Page –Setting the Trigger 86
Figure 84: The RS-232 over TP Page –Setting the Sync on Trigger 86
Figure 85: The RS-232 over TP Page –the Power on Command 87
Figure 86: The Emergency Alert System Page 88
Figure 87: The Emergency Alert System Page –Local Message Example 89
Figure 88: The Security Page –Security Deactivated 90
Figure 89: The Security Page –Activating the Security 90
Figure 90: The Security Page –Authentication Required 90
Figure 91: The Security Page 91
Figure 92: The About Us Page 91
Figure 93: Loading a Configuration 92
Figure 94: Saving a Configuration 92
Figure 95: Port Tunneling 93

VP-774AMP – Introduction
1
1 Introduction
Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been
providing a world of unique, creative, and affordable solutions to the vast range of
problems that confront video, audio, presentation, and broadcasting professionals
on a daily basis. In recent years, we have redesigned and upgraded most of our
line, making the best even better!
Our 1,000-plus different models now appear in 14 groups that are clearly defined by
function: GROUP 1: Distribution Amplifiers; GROUP 2: Switchers and Routers;
GROUP 3: Control Systems; GROUP 4: Format/Standards Converters; GROUP 5:
Range Extenders and Repeaters; GROUP 6: Specialty AV Products; GROUP 7:
Scan Converters and Scalers; GROUP 8: Cables and Connectors; GROUP 9:
Room Connectivity; GROUP 10: Accessories and Rack Adapters; GROUP 11:
Sierra Video Products; GROUP 12: Digital Signage; GROUP 13: Audio; and
GROUP 14: Collaboration.
Congratulations on purchasing your Kramer VP-774AMP Presentation
Switcher/Scaler. This product, which incorporates HDMI™ technology, is ideal for:
Projection systems in conference rooms, boardrooms, auditoriums, hotels
and churches, production studios, rental and staging
Any application where high quality conversion and switching of multiple and
different video signals to graphical data signals is required for projection
purposes

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VP-774AMP - Getting Started
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
Go to http://www.kramerelectronics.com/support/product_downloads.asp
to check for up-to-date user manuals, application programs, and to check
if firmware upgrades are available (where appropriate).
2.1 Achieving the Best Performance
To achieve the best performance:
Use only good quality connection cables (we recommend Kramer high-
performance, high-resolution cables) to avoid interference, deterioration in
signal quality due to poor matching, and elevated noise levels (often
associated with low quality cables)
Do not secure the cables in tight bundles or roll the slack into tight coils
Avoid interference from neighboring electrical appliances that may adversely
influence signal quality
Position your VP-774AMP away from moisture, excessive sunlight and dust
This equipment is to be used only inside a building. It may only be
connected to other equipment that is installed inside a building.
2.2 Safety Instructions
Caution:
There are no operator serviceable parts inside the unit
Warning:
Use only the power cord that is supplied with the unit
Warning:
Do not open the unit. High voltages can cause
electrical shock! Servicing by qualified personnel only
Warning:
Disconnect the power and unplug the unit from the wall
before installing
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VP-774AMP – Getting Started
3
2.3 Recycling Kramer Products
The Waste Electrical and Electronic Equipment (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. To comply with the WEEE Directive,
Kramer Electronics has made arrangements with the European Advanced
Recycling Network (EARN) and will cover any costs of treatment, recycling and
recovery of waste Kramer Electronics branded equipment on arrival at the EARN
facility. For details of Kramer’s recycling arrangements in your particular country go
to our recycling pages at http://www.kramerelectronics.com/support/recycling/.

4
VP-774AMP - Overview
3 Overview
The Kramer VP-774AMP is a high quality presentation switcher and scaler. It
accepts one of nine inputs: an SDI signal on a BNC connector, a DisplayPort (DP)
signal on a DisplayPort connector, one composite video signal on an RCA
connector, two computer graphics signals on 15-pin HD connectors, and four HDMI
signals on HDMI connectors. It scales the video, embeds the audio, and
simultaneously outputs the signal as follows: to two HDMI outputs, to an SDI output
and to an HDBaseT TP output, together with a digital audio output and a balanced
stereo audio output.
The VP-774AMP Presentation Switcher / Scaler features:
PixPerfect™Scaling Technology –Kramer’s precision pixel mapping and
high quality scaling technology. High-quality 3:2 and 2:2 pull down de-
interlacing and full up and down scaling of all video input signals
State-of-the-art video processing technology, with the highest quality de-
interlacing, noise reduction, and scaling performance for both standard-
definition and high-definition signals
K-IIT XL™ Picture-in-Picture Image Insertion Technology - Ultra stable
picture−in−picture, picture−and−picture and split screen capability, or fully
customizable windows’size and position control: any source can be inserted
into or positioned next to any other source and resized as desired
Ultra-Fast Fade-Thru-Black (FTB™) Switching - Video switching transitions
are clean and ultra-fast. The video fades to black and the new input fades
from black for smooth, glitch-free switching. The output signal provides
constant sync so the display never glitches
An emergency alert system that can have a national or campus-wide
notification immediately displayed when an emergency situation develops, by
means of automatic text overlaying, either via a crawler or a full screen cover
up, as well as an optional audio alert
Port tunneling, bidirectional RS-232 interface –simple control commands
and data can flow in both directions from a controller to the VP-774AMP via
the Ethernet, allowing status requests and control of the destination unit
Advanced deinterlacing functions - including 3D comb filtering, film mode,
diagonal correction and motion detection

VP-774AMP – Overview
5
Scaled Outputs –2 HDMI outputs, an SDI output and an HDBaseT TP
output simultaneously
HDBaseT™ technology with a bandwidth of up to 6.75Gbps (2.25Gbps per
graphic channel)
System Range - Up to 130m (430ft) normal mode; up to 180m (590ft) ultra-
mode (1080p @60Hz @24bpp) when using BC−HDKat6a cables
For optimum range and performance using HDBaseT™, use Kramer's
BC−HDKat6a cable. Note that the transmission range depends on
the signal resolution, source and display used. The distance using
non−Kramer CAT 6 cable may not reach these ranges.
Output Resolutions –HDTV and Computer Graphics up to 2k and
1080p/UXGA with selectable refresh rates
Multiple Aspect Ratio Selections –Follow input, follow output, best fit, letterbox
Multi-Standard SDI support - SDI (SMPTE 259M), HD-SDI (SMPTE 292M)
and 3G HD-SDI (SMPTE 424M)
Looping 3G HD-SDI Input
SDI channeling, letting you select one active audio signal and three
bypassed signals from eight embedded stereo audio channels
Multi-Standard Video support - NTSC (3.58/4.43), PAL (M/N/60) and SECAM
Built-in Time Base Corrector - Stabilizes unstable video sources
Built-in Proc-Amp with enhanced functions such as color correction, gamma
and dither
Input and output audio level adjustment
Balanced stereo audio inputs, with two unbalanced microphone inputs, as
well as digital stereo and balanced stereo outputs
Selectable Microphone talkover or mix modes
A built-in 2x10W power amplifier with speaker outputs on a 4-pin terminal
block connector
Automatic detection and selection of the HDMI and DP embedded audio.
The VP-774AMP automatically outputs the signal from the HDMI and DP
embedded audio inputs or performs an analog takeover to output the
respective analog audio input
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VP-774AMP - Overview
Selectable Power Save modes for energy efficient usage
HDCP Compliant - The HDCP (High Definition Content Protection) license
agreement allows copy-protected data on the HDMI input to pass only to the
HDMI and HDBaseT outputs
In addition, the VP-774AMP Presentation Switcher / Scaler:
Includes luma keying via the PiP window
Features advanced EDID management (native resolution and color depth) per
input
Analyzes the connected output’s EDID for optimal scaling
Auto-positions the input to fit the window perfectly
Supports picture zooming both on main and PiP window from 100% to
1600%, including separate V and H sharpness control
Provides input and output color space control
Supports HDMI deep color for inputs and output
Features vertical Keystone operation
Features selectable test patterns
Comes with an On-Screen Display (OSD) for easy setup and adjustment,
accessible via the IR remote control and via the front-panel buttons
Has a non-volatile memory that retains the last settings used for each input
and window combination
Supports firmware upgrade via RS-232 and Ethernet
Is HDTV and computer graphics compatible and the resolution can be up- or
down-scaled as required (see output resolutions in Section 6.7)
Control your VP-774AMP:
Directly, via the front panel push buttons
By RS-232 serial commands transmitted by a touch screen system, PC, or
other serial controller
Remotely, from the infrared remote control transmitter
Via the Ethernet (optionally via the Web pages)

VP-774AMP – Overview
7
The VP-774AMP is housed in a 19” 1U rack mountable enclosure, with rack “ears”
included, and is fed from a 100-240 VAC universal switching power supply.
3.1 HDCP Compliance
If an HDMI signal is HDCP protected, it can only appear on HDMI and
HDBaseT outputs that are connected to HDCP compliant displays.
The VP-774AMP will not output an HDCP protected source to a display
that is not HDCP compliant. Instead it will show a green screen.
In the dual window display mode (see Section 7.2), even if only one of
the inputs is HDCP protected, and is output to a non-compliant display,
it will affect the entire screen and turn it green.
3.2 About HDBaseT™ Technology
HDBaseT™ is an advanced all-in-one connectivity technology (supported by the
HDBaseT Alliance). It is particularly suitable in the ProAV –and also the home –
environment as a digital networking alternative, where it enables you to replace
numerous cables and connectors by a single LAN cable used to transmit, for
example, uncompressed full high-definition video, audio, IR, as well as various
control signals.
The products described in this user manual are HDBaseT certified.
3.3 Using Twisted Pair Cable
Kramer engineers have developed special twisted pair cables to best match our
digital twisted pair products; BC−HDKat6a (CAT 6 23 AWG cable) significantly
outperforms regular CAT 5 / CAT 6 cables.
We strongly recommend that you use shielded twisted pair cable.
3.4 Defining the VP-774AMP Presentation Switcher/Scaler
This section defines the VP-774AMP.
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Figure 1: VP-774AMP Presentation Switcher/Scaler Front Panel
#
Feature
Function
1
IR Receiver
Accepts IR remote commands
2
IR LED
Lights red when the unit accepts IR remote commands
3
INPUT Selector
Buttons
HDMI
Press to select the HDMI input (from 1 to 4)
4
PC
Press to select the computer graphics input (from 1 to 2)
5
CV
Press to select the composite video input (from 1 to 2)
6
DP
Press to select the Display Port input
7
SDI
Press to select the SDI input
8
PIP Button
Toggles the dual window mode (Picture-in-Picture) function (see Section 7.2)
Note that while browsing the OSD menu in the dual window mode, a long press of the PIP button will instantly toggle the window
control (between Main and PiP)
9
BLANK Button
Press to toggle between a blank screen (blue or black screen) and the display
10
FREEZE Button
Press to freeze/unfreeze the output video image
11
Navigation
Buttons
/- Button
Press to move down the menu list (see Section 8.1.1) and to decrease numerical values. When not within the OSD menu mode,
press to reduce the output volume
12
/MENU Button
Press to access the OSD menu, exit the OSD menu and, when in the OSD menu, move to the previous level in the OSD screen
(see Section 8.1.1)
13
/+ /VOLUME
Button
Press to move up the menu list values (see Section 8.1.1) and to increase numerical values. When not within the OSD menu
mode, press to increase the output volume
14
/ENTER Button
Press to access sub-menu items and select from several settings (see Section 8.1.1)
15
RESET TO XGA/720P Button
Press to reset the video output resolution to XGA or 720p and change the deep color settings to Off on the output (see
Section 6.7)
Press and hold for about 3 seconds to toggle between reset to XGA and reset to 720p
16
PANEL LOCK Button
Press and hold for about 3 seconds to lock/unlock the front panel buttons
17
Mic 2
Connect to a microphone.
Mic2 on the front panel is identical to Mic2 on the rear panel and overrides it when connected
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VP-774AMP –Overview

VP-774AMP –Overview
9
Figure 2: VP-774AMP Presentation Switcher/Scaler Rear Panel
#
Feature
Function
18
AUDIO IN
Unbalanced
Connectors
HDMI 3.5mm Mini Jack
Connect to an unbalanced audio source for audio takeover of the HDMI 1 to HDMI 4 embedded audio (see
Section 6.3). The pinout is defined in Section 5.4
19
PC 3.5mm Mini Jack
Connect to the unbalanced stereo audio of the computer graphics source (from 1 to 2). The pinout is defined
in Section 5.4
20
DP 3.5mm Mini Jack
Connect to the unbalanced stereo audio source for analog audio takeover of the DisplayPort embedded
audio (see Section 6.3). The pinout is defined in Section 5.4
21
CV (L, R) RCA
Connect to the unbalanced stereo audio of the composite video source
22
MIC 1
6mm Jack
Connect to a microphone (see pinout in Section 5.3)
23
COND/DYN MIC
DIP-switch
Select between a condenser and a dynamic type microphone
24
MIC 2
6mm Jack
Connect to a microphone (see pinout in Section 5.3)
Note that Mic2 on the rear panel is identical to Mic2 on the front panel. Mic2 on the front panel overrides
Mic2 on the rear panel when connected
25
COND/DYN MIC
DIP-switch
Select between a condenser and a dynamic type microphone
26
REMOTE IR 3.5mm Mini Jack (opening)
Covered by a cap. The 3.5mm connector at
the end of the internal IR connection cable
fits through this opening
Connects to an external IR receiver unit for controlling the machine via an IR remote controller (instead of
using the front panel IR receiver)
Optional. Can be used instead of the front panel (built-in) IR receiver to remotely control the machine (only if
the internal IR connection cable has been installed), see Section 8.4.1
27
SPKR OUT 4-pin Terminal Block
Connects to a pair of loudspeakers
28
S/PDIF OUT RCA Connector
Connect to a digital audio acceptor
29
Power Connector with Fuse
AC connector, enabling power supply to the unit
30
POWER Switch
Switch for turning the unit on or off
31
VIDEO INPUT
Connectors
HDMI IN
Connect to the HDMI source (from 1 to 4)
32
PC IN 15-pin HD
Connect to the computer graphics source (from 1 to 2)

#
Feature
Function
33
CV IN RCA
Connect to the composite video source
34
DP IN
Connect to the DisplayPort source
35
SDI IN BNC
Connect to the SDI source
36
SDI LOOP BNC
Connect to a local display
37
VIDEO
OUTPUT
Connectors
SDI OUT BNC
Connect to an SDI acceptor
38
HDMI OUT
Connect to an HDMI acceptor (from 1 to 2)
39
HDBT OUT RJ-45
Connect to an HDBT receiver (for example, Kramer TP-580Rxr) to pass audio and video signals as well as
serial commands
40
LINK LED
Lights to indicate a link
41
RS-232 9-pin D-sub Port
Connect to the PC or other serial controller
42
ETHERNET Connector
Connects to the PC or other Controller through computer networking
43
ETHERNET RESET Button
Press while turning power off and then on, to reset the Ethernet settings to their factory default state (see
also Section 12.1)
44
AUDIO LINE OUT (L, R) Terminal Block
Connector
Connect to the L and R balanced stereo audio acceptor
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VP-774AMP –Overview

VP-774AMP - Installing in a Rack
11
11
4 Installing in a Rack
This section provides instructions for rack mounting the unit.

12
VP-774AMP - Connecting the VP-774AMP
5 Connecting the VP-774AMP
Always switch off the power to each device before connecting it to
your VP-774AMP. After connecting your VP-774AMP, connect its
power and then switch on the power to each device.
You do not have to connect all the inputs and outputs, connect only
those that are required.
To connect the VP-774AMP, as illustrated in the example in Figure 4, do the
following:
1. Connect an HDMI source (for example, a DVD player) to the HDMI 1 IN
VIDEO INPUT connector.
Alternatively, you can connect the DVI connector on the DVD player to the HDMI
connector on the VP-774AMP via a DVI-HDMI adapter. You can connect the audio
signal via the AUDIO IN HDMI 3.5mm mini jack, or use the embedded audio
2. Connect a computer graphics source to the PC 1 IN VIDEO INPUT 15-pin
HD connector.
Alternatively, you can connect a component (YPbPr) or RGBHV source via the 15-pin
HD connector, see Figure 3
Figure 3: 15-pin HD Connector Pinout
3. Connect a composite video source (for example, a composite video player)
to the CV 1 IN RCA connector.
4. Connect a DisplayPort video source (for example, a computer graphics
source) to the DP IN connector.
5. Connect the audio input signals to the AUDIO IN connectors (3.5mm mini
jack and RCA connectors), as required (not shown in Figure 4).
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VP-774AMP - Connecting the VP-774AMP
13
13
6. Connect an SDI source (for example, an SDI digital camera) to the SDI IN
BNC connector.
7. Connect the SDI LOOP BNC connector to an SDI monitor (for example, an
SDI display).
8. Connect the SDI OUT BNC connector to an SDI acceptor (for example, an
SDI display with speakers).
9. Connect the HDMI 1 OUT connector to an HDMI acceptor (for example, an
LCD display).
You can also connect the HDMI OUT 2 output (not shown in Figure 4)
10. Connect the HDBT RJ-45 connector to a receiver (for example, the Kramer
TP-580Rxr).
11. Connect the AUDIO LINE OUT Terminal Block connector to a balanced
audio acceptor and the S/PDIF OUT RCA connector to a digital audio
acceptor (not shown in Figure 4).
12. Connect the SPKR OUT block connector to a pair of loudspeakers, by
connecting the left loudspeaker to the “L+” and the “L-” terminal block
connectors, and the right loudspeaker to the “R+” and the “R-” terminal block
connectors. Do not Ground the loudspeakers.
13. If required, you can connect a PC and/or controller to the:
RS-232 terminal block (see Section 8.3.2)
Ethernet connector (see Section 8.3.3)
14. Connect the power cord (not shown in Figure 4).

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VP-774AMP - Connecting the VP-774AMP
Figure 4: Connecting the VP-774AMP Presentation Switcher/Scaler