Harman 4X3500 Operation Manual

4x3500 Operation Manual

Obtaining Other Language Versions: To obtain information in another language about the use of this product, please contact your local Crown Distributor. If you need assistance locating your local distributor, please contact Crown at 574-294-8000.

This manual does not include all of the details of design, production, or variations of the equipment; nor does it cover every possible situation which may arise during installation, operation or maintenance.

The information provided in this manual was deemed accurate as of the publication date; however, updates to this information may have occurred. To obtain the latest version of this manual, please visit the Crown website at www.crownaudio.com.

Trademark Notice: Crown, Crown Audio, IQ, BCA, and Amcron are registered trademarks of Crown International. HiQnet is a trademark of Harman International Industries, Inc. Other trademarks are the property of their respective owners.

Some models may be exported under the name Amcron

142483-1 - 5/11

Important Safety Instructions

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including ampliﬁers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not ﬁt into your outlet, consult an electrician for replacement of the obsolete outlet.

10. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

11. Only use attachments/accessories speciﬁed by the manufacturer.

12. Use only with a cart, stand, tripod, bracket, or table speciﬁed by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

13. Unplug this apparatus during lightning storms or when unused for long periods of time.

14. Refer all servicing to qualiﬁed service personnel. Servicing is required when the apparatus has been damaged in any way, such as powersupply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

15. Use the mains plug to disconnect the apparatus from the mains.

16. WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.

17. DO NOT EXPOSE THIS EQUIPMENT TO DRIPPING OR SPLASHING AND ENSURE THAT NO OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, ARE PLACED ON THE EQUIPMENT.

18. THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE.

TO PREVENT ELECTRIC SHOCK, DO NOT REMOVE TOP OR BOTTOM

COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

TO COMPLETELY DISCONNECT THIS EQUIPMENT FROM THE

AC MAINS, DISCONNECT THE POWER SUPPLY CORD PLUG FROM THE AC RECEPTACLE. THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE.

WATCH FOR THESE SYMBOLS:

The lightning bolt triangle is used to alert the user to the risk of electric shock.

The exclamation point triangle is used to alert the user to important operating or maintenance instructions.

IMPORTANT

VRacks require Class 2 output wiring.

MAGNETIC FIELD

CAUTION! Do not locate sensitive high-gain equipment such as preampliﬁers or tape decks directly above or below the unit. Because this ampliﬁer has a high power density, it has a strong magnetic ﬁeld which can induce hum into unshielded devices that are located nearby. The ﬁeld is strongest just above and below the unit.

If an equipment rack is used, we recommend locating the ampliﬁer(s) in the bottom of the rack and the preampliﬁer or other sensitive equipment at the top.

FCC COMPLIANCE NOTICE

This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

CAUTION: Changes or modiﬁcations not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that

to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

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Operation Manual

Table of Contents

Welcome

Features....................................................................................................................................................................................5

Setup .......................................................................................................................................................................................12

I-Tech HD Ampliﬁer Speciﬁcations ...................................................................................................................................12

Front & Back Panel Features .............................................................................................................................................13

Input Panel .............................................................................................................................................................................15

Input Wiring Schematic.......................................................................................................................................................17

Input Wiring Modes..............................................................................................................................................................16

VDrive .....................................................................................................................................................................................21

HiQnet™ Software ................................................................................................................................................................36

System Diagrams .................................................................................................................................................................42

Crown Audio Factory Service Information ......................................................................................................................46

Product Registration ............................................................................................................................................................47

Welcome

The VRack is comprised of a rugged touring rack ﬁtted with three Crown IT4X3500HD DriveCore Series ampliﬁers, a power input panel, and a custom engineered input panel. The input panel is mounted at the top rear and supplies CobraNet(TM) network connections as well as AES3, VDrive and analog XLR connections. The output connections utilize the two NL4 and one NL8 output connector per ampliﬁer. The front-mounted power panel includes a 5-pin Hubbell Twist-Lock connector and a 5-pin CEE-Form connector.

Because the VRack is supplied with all components installed and internally connected, there is no need for laborious rack building; no chance that a component might be improperly connected; this results in a dramatically lower chance of connection failure.

The VRack is best thought of not as just an amp rack, but as a building block for your system. Every time you add 1 VRack into a system, you are adding 1 block that powers your system to optimal performance, and seamlessly integrates into your system via analog or digital connections.

Each IT4X3500HD has 4 channels, each one capable of 1900 watts into 8 ohms and 2400 watts into 4 ohms. The input panel is engineered by Crown to give the VRack user optimum ﬂexibility when deploying a VRack system for powering VerTec fullsize (VT4889), midsize (VT4888), compact (VT4887A), or subcompact (VT4886) models and their companion subwoofers (VT4880, VT4880A, VT4881A, VT4882, VT4883) as well as the JBL VTX Series and STX Series Loudspeakers.

The input panel buffers AES signals internally, reducing or eliminating the need for additional digital AES3 distribution ampliﬁers. Through VDrive (pg.27), the user is able to run Ethernet control and AES digital audio over a single Cat5 which jumps from rack to rack.

VRack is manufactured and tested to a single meticulous standard, and then shipped around the world. This means that any time you supply or cross-rent a VRack it is the same as every other VRack in the world.

Features

• 3 IT4X3500HD DriveCore Series ampliers

• Fully assembled package from one source

• Worldwide power distribution with both L21-30 and 32A CEE-Form connections

• Flexible input panel with Analog, AES, and VDrive

• Fail-over AES and network connection

• VDrive AES digital distribution over CAT5

• Built-in network control

• Built-in captive suspension

• Shock-mounted rack

• Removable dolly board

• Side-storing rack doors

• Entire package is UL/CSA/ETL

• HiQnet™ control – System Architect, JBL Performance Manager, Powered by Crown and HiQnet Motion Control

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Operation Manual

Setup

Rack Speciﬁc

Weight: 187 lbs (84.82 kg)

Dimensions:

L x W x H with caster plate – 22 ½” X 23 ½” X 31 ¼” ( 57.2 cm X 59.7 cm X 79.4 cm )

L x W x H without caster plate – 22 ½” X 23 ½” X 25 7/8” (57.2 cm X 59.7 cm X 65.7 cm)

Front View (23-1/2" x 31-1/4")

Top View (23-1/2" x 22-1/2")

Side View (22-1/2" x 31-1/4")

Bottom View (22-1/2" x 23-1/2")

Suspension

Safety Precautions: Before attempting to suspend your speakers or power ampliﬁer rack, read and understand the

following safety information.

Important Suspension Safety Warning!

The information is this section has been assembled from recognized engineering data and is intended for informational purposes only. None of the information in this section should be used without ﬁrst obtaining competent advice with respect to applicability to a given circumstance. None of the information presented herein is intended as a representation or warranty on the part of Crown. Anyone making use of this information assumes all liability arising from such use.

All information presented herein is based upon materials and practices common to North America and may not directly apply to other countries because of differing material dimensions, speciﬁcations, and/or local regulations. Users in other countries should consult with appropriate engineering and regulatory authorities for speciﬁc guidelines.

Correct use of all hardware is required for secure system suspension. Careful calculations should always be performed to ensure that all components are used within their rated workload before the array is suspended. Never exceed maximum recommended load ratings.

Before suspending any speaker system or power ampliﬁer rack, always inspect all components (enclosure, suspension frames, pins, etc.) for cracks; deformation; corrosion; missing, loose or damaged parts that could reduce strength and safety of the array. Do not suspend the speaker or power ampliﬁer rack until the proper corrective action has been taken. Use only loadrated hardware when suspending the VRack.

Are You New to Suspension?

If you are new to suspension, you should do the following:

• Read and study.

• Know the Rules for Safe Suspension.

• Attend a safe suspension seminar, such as that presented by professionals like Suspension Seminars™ or by Chain Motor

Hoist manufacturers like Columbus McKinnon Corp. (manufacturers of the C/M Lodestar).

• Meet and establish a relationship with a licensed mechanical or structural engineer. Get in the habit of asking them

questions instead of guessing about their answers. Learn from what they tell you.

• Meet and discuss this aspect of your business with your Insurance Agent.

• Research and understand the codes, practices, and requirements in the venues where you intend to operate your system.

General Hardware Information

Any hardware used in an overhead suspension application must be load rated for the intended use. Generally, this type of hardware is available from suspension supply houses, industrial supply catalogs and specialized suspension distributors. Local hardware stores do not usually stock these products.

Attachment to Structures

A licensed Professional Engineer must approve placement and method of attachment to structures prior to installation of any

Rack-Speciﬁc Info:

• Colson 3 ½” polyurethane casters rated at 250 lbs (113 kg) per caster

• Polycarbonate, UV stabilized, “virtually unbreakable” front see-through door with 30x the impact resistance of acrylic

• Shock mounting using 8 neoprene rubber isolators rated at 90 lbs (41 kg) vertical and 30 lbs (13.6 kg) horizontal

with steel insert

• Captive pocket door system with a single-slam latch

• Removable caster plate with interlocking stacking system

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Operation Manual

overhead object. The following performance standards should be provided to the Professional Engineer for design purposes: Uniform Building Code as applicable, Municipal Building Code as applicable, Seismic Code as applicable. Installation of hardware and method of attachment must be carried out in the manner speciﬁed by the Professional Engineer. Improper installation may result in damage, injury or death.

Setup

Suspension Hardware Inspection & Maintenance

Suspension systems are comprised of mechanical devices and, as such, they require regular inspection and routine maintenance to ensure proper function ability. The Crown VRack must be inspected for fatigue at least annually. The inspection shall include a visual survey of all corners and load-bearing surfaces for signs of cracking, water damage, de-lamination, or any other condition that may decrease the strength of the power ampliﬁer rack enclosure. Accessory suspension hardware provided with or for the Crown VRack must be inspected for fatigue at least annually. The inspection shall include a visual material survey for signs of corrosion, bending or any other condition that may decrease strength of the fastener. For other ﬁttings used, refer to the manufacturer’s inspection and maintenance guidelines for process.

Crown is not responsible for the application of its products for any purpose or the misuse of this information for any purpose. Furthermore, Crown is not responsible for the abuse of its products caused by avoiding compliance with inspection and maintenance procedures or any other abuse. Prior to suspending the system, an expert trained and experienced in ﬂying loudspeaker and power ampliﬁer systems should inspect all suspension parts and components.

Industry Resources

Allen Products 562-424-1100 1635 E. Burnett Street Signal Hill, CA 90755 www.adapttechgroup.com

M.A.N. Flying Systems 20 Sidar Road Brook Road Industrial Estate Rayleight, Essex SS6 7XF U.K. www.manﬂy.co.uk

McMaster Carr Various locations throughout the U.S.A. For a location near you, visit them online: www.mcmastercarr.com

Safe Suspension

The Crown VRack is equipped with integral suspension hardware and should only be suspended using the supplied equipment. The system is designed to facilitate the suspension of the VRacks by a qualiﬁed person familiar with suspension hardware and industry practices. Improper installation may result in damage, injury or death.

Working Load Limit

The working load limit (WLL) for any group of VRack products is noted on the appropriate VRack Array Frame. If interested in suspending your VRacks, contact your local Crown representative for information on ordering VRack Suspension Frame.

Type of Connectors to Use with VRack

L21-30

Mcaster-Carr Female: 7184K35 Male: 7184K34

Hubbel Catalog Female: HBL2813 Male: HBL2811

IEC 309 Pin + Sleeve

Walther-Electric Female: 330 Male: 230

Cooper Crouse-Hinds Female: CH532C6W Male: CH532P6W

VRack Power Distribution Overview

The VRack Power Distribution panel offers worldwide use capabilities as well as multiple AC operations when used with 120VAC input. This power distribution system allows 120VAC input to 120VAC output, 120VAC input to 208VAC output when

used with 3 phase power, 220VAC – 240VAC input to 220VAC – 240VAC output. It also features a 32A per circuit, 3-pole,

single-throw breaker as well as an LCD readout that indicates AC Voltage. Built-in +5V and +12V outputs power the VRack’s built-in network switch and rear rack lighting features. Combine this worldwide capable power distro with the I-Tech HD’s Universal, Power-Factor-Corrected Power Supply and the VRack can be used anywhere in the world.

Hubbell L21-30 U.S. Operation

Hubbell L21-30 12 120VAC Operation

Switch position “Input Twistlock, Output US/120” provides the user with 120V

operation to the I-Tech HD ampliﬁers in the rack. From an external power distribution system, send 3 phase 120VAC power to the X, Y, and Z pin of the Hubbell connector and the VRack will operate in 120V mode. Each I-Tech HD ampliﬁer will see a dedicated X, Y, or Z phase to the line input, neutral, and Ground connection.

Amp 1 = X, Neutral, and GND

Amp 2 = Y, Neutral, and GND

Amp 3 = Z, Neutral, and GND

VRack Connectors

Hubbell L21-30 208VAC Operation

Switch Position “Input Twistlock, Output US/208” provides the user with

208VAC operation to the I-Tech HD ampliﬁers in the rack. From an external power distribution system, send 3 phase 120VAC power to the X, Y, and Z pin of the Hubbell connector and the VRack will operate in 208V mode. Each I-Tech HD ampliﬁer will see a dedicated line-to-line and ground connection resulting in the VRack operating in 208VAC mode.

IEC 309 Pin + Sleeve style Loop out Walther 430

page 8 page 9

IEC 309 Pin + Sleeve style Input Walther 635

NEMA L21-30 Panel mount Hbl2815

Operation Manual

Amp 1 = X, Y, and GND

Amp 2 = Y, Z, and GND

Amp 3 = X, Z, and GND

SetupSetup

Cee-Form U.S. Operation

Cee-Form 120VAC Operation

Cee-Form 208VAC Operation

Power Supply Schematic

Switch Position “Input Pin/Sleeve, Output US/120 EU/240” provides 120VAC

operation from the Cee-Form pin and sleeve connector. From an external power distribution system, send 3 phase 120VAC power to the X, Y, and Z pin of the Cee-Form connector and the VRack will operate in 120VAC operation mode. Each I-Tech HD ampliﬁer will see a dedicated line-to-neutral connection as well as a ground. Once the Cee-Form connector is landed to the VRack, one can link to the next VRack using a Cee-Form jumper cable. (***To link

VRacks using this method at 110VAC-120VAC, the end user must ensure they have proper AC current available. Also, please refer to the I-Tech HD Thermal and Current Draw speciﬁcations to ensure you are not overloading the AC lines, resulting in breakers opening. It is recommended if you wish to link VRacks, they be operated at 220VAC-240VAC.)

Amp 1 = X, Neutral, and GND

Amp 2 = Y, Neutral, and GND

Amp 3 = Z, Neutral, and GND

Switch Position “Input Pin/Sleeve, Output US/208” provides 208VAC Operation

from the Cee-Form pin and sleeve connector. From an external power distribution system, send 3 phase 120VAC power to the X, Y, and Z pin of the Cee-Form connector and the VRack will operate in 208VAC operation mode. Each I-Tech HD ampliﬁer will see a dedicated line-to-line connection as well as ground. In “Input Pin/Sleeve, Output US/208” mode, the end user is able to link 2 VRacks together. Amp 1 = X, Y, and GND

Amp 2 = Y, Z, and GND

Amp 3 = X, Z, and GND

Cee-Form Non-U.S. Operation

Cee-Form 220VAC-240VAC Operation

Switch Position “Input Pin/Sleeve, Output US/120 EU/240” provides 220VAC-

240VAC operation from the Cee-Form pin and sleeve connector. From an external power distribution system, send 3 phase 220VAC-240VAC power to the X, Y, and Z pin of the Cee-Form connector and the VRack will operate in 220VAC-240VAC operation mode. Each I-Tech HD ampliﬁer will see a dedicated line-to-neutral connection as well as a ground. Once the Cee-Form connector is landed to the VRack, one can link to the next VRack using a CeeForm jumper cable. (***To link VRacks using this method at 220VAC-240VAC,

the end user must ensure they have proper AC current available. Also, please refer to the I-Tech HD Thermal and Current Draw speciﬁcations to ensure you are not overloading the AC lines, resulting in breakers opening. It is recommended if you wish to link VRacks, they be operated at 220VAC-240VAC.)

Amp 1 = X, Neutral, and GND

Amp 2 = Y, Neutral, and GND

Amp 3 = Z, Neutral, and GND

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Operation Manual

I-Tech HD Amplier Specications

I-Tech HD Ampliﬁer Speciﬁcations

The Crown® I-Tech 4X3500HD DriveCore Series offers amazing power, light weight and ease of use for tour sound

applications. Unlike other ampliers, it includes onboard high-denition DSP, a 4.3” LCD TFT Capacitive Touchscreen, and a

built-in network connection.

Modern power ampliﬁers are sophisticated pieces of engineering capable of producing extremely high power levels. They must be treated with respect and correctly installed if they are to provide the many years of reliable service for which they were designed.

In addition, I-TechHD Series ampliﬁers include a number of features which require some explanation before they can be used to their maximum advantage. Please take the time to study this manual so that you can obtain the best possible service from your ampliﬁer.

For more information please refer to I-Tech 4X3500 HD manual.

Features:

• Global Power Supply with PFC (Power Factor Correction) works anywhere in the world

• High power density, up to 12,000 watts in a 2U chassis

• Output voltage of 185Vpk provides clean transient peaks

• 6th-generation patented Class I (BCA®) circuitry couples power efciently to the load and provides low AC current draw

• Onboard high-denition Analog Devices Sharc DSP with 24-bit, 192 kHz SHARC A/D and D/A converters; advanced IIR

ﬁlters and linear phase FIR ﬁlters

• Pushbutton presets simplify setup; custom presets for various loudspeakers can be downloaded or created

• AES3 digital audio input with VDrive

• EtherCon® Ethernet connector for HiQnet™ control or CobraNet™ digital audio transport – this “Single Plug” connection allows HiQnet™ protocol and CobraNet™ digital audio through the same CAT 5 cable

• LCD Control Screen is used to adjust the amplier’s attenuation and muting, congure the amp, set up and view error

monitoring, and recall DSP presets to reconﬁgure the amp for various applications

• Comprehensive array of indicators provide accurate diagnostics: Power, Data, along with Ready, Signal, Clip, Thermal and

Fault for each channel

• AC mains indicator in power switch glows green when AC power is present

• Front-panel USB connector accepts a USB drive to transfer presets from the drive to the amplier DSP, and vice versa

• Lightweight due to aluminum chassis, special internal construction and switching power supply

• Thermal management controller and two discrete thermal zones with variable-speed fans, forced-air cooling

• Advanced protection circuitry guards against: shorted outputs, DC, mismatched loads, general overheating, under/over

voltage, high-frequency overloads and internal faults

• Five-Year, No-Fault, Fully Transferable Warranty completely protects your investment and guarantees its specications

Front Panel Features

LCD Voltage Readout

Back Panel Features

Three IT4x3500HD Ampliﬁers

L21-30 Hubbell Connector

5-Pin Cee-Form Input32A Breakers

5-Pin Cee-Form Loop Out

Input Panel

I-TECH 4x3500 | 2 300W

REG. U.S. PAT. OFF. 5,657,219 6,504,348 6,9 09,321

7,283,379 7,557,622 7,919,998 7,778,324 7,521,936

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CLASS 2 OUTPU T WIRING

Operation Manual

Setup Input Panel

Choose Input Wire and Connectors

Crown recommends using pre-built or professionally wired, balanced line (two-conductor plus shield), 22-24 gauge cables with 3-pin XLR connectors. Unbalanced line may also be used but may result in noise over long cable runs.

Figure 1 shows connector pin assignments for balanced analog wiring or AES/EBU digital wiring. (The use of standard analog cable with AES/EBU will result in diminished performance) For best results, 110 ohm shielded twisted-pair cable for AES/EBU signals is highly recommended. Figure 2 shows connector pin assignments for unbalanced analog wiring.

NOTE: Custom wiring should only be performed by qualiﬁed personnel.

NETWORK AES 1+2 AES 3+4 ANALOG 1 ANALOG 2

A GD F

B HC

AES XLR

No VDrive

to VDrive

or AES to

On-Amp

Amps

VDrive through

Ethernet In Only

IN OUT IN OUT IN OUT IN OUT

NETWORK

Send to Network Output

OFF

OUT

Choose Output Wire and Connectors

Crown recommends using pre-built or professionally wired, high-quality, two-, four- or eight-conductor, heavy gauge speaker wire and connectors. Use Class 2 output wiring. You may use a 4- or 8-pole Speakon® connector. To prevent the possibility of short circuits, wrap or otherwise insulate exposed loudspeaker cable connectors.

CAUTION – SHOCK HAZARD: Potentially lethal voltages exist at the output connectors when the ampliﬁer is turned on and is passing a signal.

Using the guidelines below, select the appropriate size of wire based on the distance from ampliﬁer to speaker.

Distance Wire Size

up to 25 ft. (up to 7.62 m) 16 AWG

26-40 ft. (7.62-12.2 m) 14 AWG

41-60 ft. (12.2-18.3 m) 12 AWG

61-100 ft. (18.3-30.5 m) 10 AWG

101-150 ft. (30.5-45.7 m) 8 AWG

151-250 ft. (45.7-76.2 m) 6 AWG

CAUTION: Never use shielded cable for output wiring.

A. Network Link input. Also distributes VDrive Digital Audio.

B. VDrive Input Switch:

AES XLR to VDrive On-Ramp - When the switch is in this position, the AES3 signal that is connected to AES 1+2 or AES 3+4 XLR is buffered then sent to the ampliﬁers via VDrive and also buffered and sent to the Network Link Out.

VDrive through Ethernet only - When the switch is in this position, the VDrive signal present on the Network Link Input is buffered and sent to the ampliﬁers via VDrive and also buffered and sent to the Network Link Out.

No VDrive or AES to Amps - When the switch is in this position, no AES3 signal is distributed from the input panel to the ampliﬁers. This mode should be used when patching AES3 signal directly to the ampliﬁers when the input panel is bypassed.

C. AES3 Inputs - Sends AES3 signal to the ampliﬁers. When VDrive switch is set to "AES XLR to VDrive On-Ramp" this input AES3 signal is sent to the 3 ampliﬁers with the VRack and sent to Network out VDrive.

D. AES3 Link Outputs - When power is applied to the rack, the AES3 signal is taken from the input, buffered, then sent to this link output connection. If the rack is not powered on, AES3 signal is still sent from the input connection but it is not buffered.

E. Analog Inputs - Analog 1 of this input panel is sent to each IT4x3500HD's analog 1 input. Analog 2 of this input panel is sent to each IT4x3500HD's Analog 3 input. This is set up this way so that when the rack is conﬁgured to bi-amp mode, the ampliﬁers see Analog 1 and 3 inputs.

F. Analog outputs - These outputs are in parallel with the analog inputs. There are no active or passive circuitry between the input and output connections.

G. VDrive Output Switch - This switch selects whether or not the buffered AES3 Signal based on the VDrive input switch selection is sent out the Network Link Output. When in "OFF" Mode, network communication is still maintained regardless of the switch position.

H. Network Link Output - Also distributes VDrive digital audio if the VDrive Output switch is enabled.

***NOTE – All AES 3 signals are sent from the input panel to the Ampliers via VDrive. Therefore, any time you use the VRack's input panel

for AES3 distribution to the ampliﬁers, the IT4x3500HD ampliﬁer must be set to VDrive AES mode. (See Page 16 for more information)

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Operation Manual

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