Wohler ATSC/DVB-3 User Manual

ATSC/DVB-3

2U Digital Stereo Speaker Monitor

(Document P/N 821507, Rev-D)

with AC-3 and AES/EBU Inputs on

XLR and BNC, Selected Digital to Analog

Outputs on XLR, Six 53-Segment

Level Meters, and Phase Indication

User Manual

CONTENTS

Title and Contents ........................................................

Introduction ..........................................................................

Section 1: Features, Specs, and Installation ......

Description and Features .......................................................

Applications and Specifications ..............................................

Installation .............................................................................

Section 2: Operation ....................................................

Front Panel Features ..............................................................

Rear Panel Features ...............................................................

Audio Amplifier and Speaker Configuration ...........................

Balance Control Characteristics ..............................................

Section 3: Technical Information ............................

General Technical information ...............................................

Level Meter Description and Specifications.................................

ATSC/DVB-3 Block Diagram ..................................................

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 dry cloth.

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

8) Do not install near any heat source 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 are 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 the 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 when power-supply 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) Do not expose this apparatus to rain or moisture.

16) The apparatus shall be connected to a mains socket outlet with a protective earthing connection.

CAUTION!

In products featuring an audio amplifier and speakers, the surface at the side of the unit, where the audio amplifier heat sink is internally attached, may get very hot after extended operation. When operating the unit excercise caution when touching this surface and ensure that external materials which may be adversely affected by heat are not in contact with it. There is a Hot Surface label (see diagram) attached to the aforementioned surface of the product.

Introduction

Congratulations on your selection of a Wohler Technologies product. We are confident it represents the best performance and value available, and we guarantee your satisfaction with it.

If you have questions or comments you may contact us at:

Phone: (510) 870-0810 Fax: (510) 870-0811

www.wohler.com support@wohler.com

Wohler Technologies, Inc.

31055 Huntwood Avenue

Hayward, CA 94544

US Toll-Free: 1-888-596-4537

ATSC/DVB-3 User Manual P/N 821507 Rev-D

General Features, Specifications,

and Installation

General Specifications

Sect. 1: General Features and Specifications

Section 1

Description

Features

Applications

Installation

ATSC/DVB-3 User Manual P/N 821507 Rev-D

Section 1: General Features, Specifications, and Installation

ATSC/DVB-3

Powered Digital Audio Monitor Unit

ATSC/DVB-3 Front Panel

Description

The ATSC/DVB-3 is a powered stereo monitor designed specifically for flexible, comprehensive monitoring of the six audio channels associcated with ATSC/DVB programming. The unit is 2RU in size, for excellent fidelity without using excessive rackspace in the critical "operating zone" of rack bays and consoles.

The ATSC/DVB-3 accepts AES/EBU and/or Dolby Digital® ( AC-3) input signals providing capabilities to handle monitoring requirements throughout the facility.

The speakers and amplifiers are arranged in the popular Wohler “biamp summed bass stereo” configuration: bass frequencies from ALL selected channels are summed into a 20W amplifier, which drives the woofer. The two side channel amplifiers and speakers reproduce, in stereo, only the mid- and high- frequencies. Note that the center speaker (the woofer) is NOT a dedicated Center nor LFE speaker. There is also a headphone output, which mutes the speakers while in use.

High-resolution, wide-range LED bargraph level meters are provided for all six channels for very accurate metering. 53 bicolor segments spanning a range of 65 or 90 dB simultaneously display signal levels according to both the PPM and VU standards. An adjustable-duration hold of the peak PPM value may also be displayed.

Both Left/Right and Front/Surround "Phase"/Polarity LED indications are provided to alert of possible cancellation from mixdown in any likely home playback situation.

To isolate possible faults, rotary switches let the operator route any one or pair of inputs to left and right speaker channels for acoustic monitoring. A toggle switch mixes all six channels down to two for listening to all channels at once.

Features

• 2U high: highest fidelity in minimum rackspace

• AES/EBU, or encoded ATSC/MPEG-2 (Dolby

Digital®) inputs on BNC and XLR connectors

• Simultaneous visual monitoring of all 6 channels

• Pro-16 signal select switch and indication LED

• Left/Right Front “phase" indicators

• Select any channel or pair of channels for isolated listening, or a stereo mixdown of all 6 channels

• 53-segment tri-color, wide-range, high-resolution

LED bargraph level meters

• SDI and AES Status Indication LEDs

• Selected channel analog outputs on XLR connectors

• Headphone output

ATSC/DVB-3 User Manual P/N 821507 Rev-D Section 1: General Features, Specifications, and Installation

Applications

The ATSC/DVB-3 is ideally suited for use in VTR bays, mobile production vehicles, teleconferencing installations, multimedia systems, satellite links and cable TV facilities, and on-air radio studios. Designed and manufactured in the U.S., the ATSC/DVB-3 is backed by a strong warranty and a satisfaction guaranteed return policy.

General Specifications

Input Meter Dynamics:

Input Level for Maximum Output (Volume Full On):

Input Overload:

Peak Acoustic Output (@ 2 ft.):

Response, Sixth Octave:

Power output,

ΩΩ

Ω):

ΩΩ

Ω):

ΩΩ

RMS Each Side (4 RMS Bass (4

Distortion, Electrical:

Distortion, Acoustic:

Hum and Noise:

Magnetic shielding:

Input connectors:

Medium-size Segments

(for Middle -distance Viewing

Simultaneous VU (bar) and PPM (dot)

0 dBv balanced

+26 dBv balanced

104 dB SPL

80 Hz - 16 kHz ± 5 dB) (-10 dB @ 40 Hz, 20 kHZ)

14 W transient / 10 W continuous 35 W transient / 25 W continuous

Less than 0.15% at any level below limit threshold

6% or less at worst case frequencies above 120 Hz, including cabinet resonance; typically less than 1.5%

Better than -68 dB below full output

Less than 0.8 Gauss any adjacent surface

Balanced: XLR

ATSC/MPEG-3 Input Specifications

Input impedance:

Minimum input level:

Playback mode:

Input connector:

75Ω (ohm) unbalanced

250 mv

“Line”

BNC

AES/EBU Input Specifications

Input characteristics:

Minimum input level:

Conversion data width:

Dynamic range:

Frequency Response:

Analog Output Distortion:

Analog outputs:

Meter input ‘0’ level:

BNC:75 Ω (ohm) unbalanced XLR:110 Ω (ohm) balanced . 5V p-p unbalanced,

2.2V p-p balanced

20 bit

95 dB

10 Hz - 20 kHz +/- 0.5 dB

< 0.005%

balanced, line-level (-20 dbfs=+4 dBu); minimum load impedance:10k Ω (ohm)

-20 dBfs

Power consumption

(Average Maximum):

AC Mains input:

"ALL" Channel Summing Assignments*:

* On special order, custom combinations of selected channels are available; either in lieu of, or in addition to, the regular selections.

60 W

100-220VAC, 50-60 Hz

Left Side =LFront+LSurr+1/2Center+1/2LFE Right Side =RFront+RSurr+1/2Center+1/2LFE

Weight:

Dimensions (HxWxD):

Physical Specifications

18 lbs. (8.2 kg)

3.5 x 19 x 12 inches (89 x 483 x 298 mm)

Audio Response Curve

+10

-10

-20

-30

2k1k50020010050 20k20

Typical 1/6 Octave Audio Response Curve

Units are designed to meet, at time of manufacture, all currently applicable product safety and EMC requirements, such as those of CE. 0 dbV ref. 0.775V RMS. Features and specifications subject to improvement without notice.

10k

ATSC/DVB-3 User Manual P/N 821507 Rev-D

Section 1: General Features, Specifications, and Installation

Installation

Mounting

The unit should be mounted where convenient for operating persons, ideally at approximately ear level for best high frequency response. Its superior magnetic shielding eliminates concerns about locating it adjacent to most types of CRT monitors, including even high-resolution color monitors.

Heat Dissipation

Heat dissipated by the speaker amps is conducted directly to the left side of the chassis; no special considerations for cooling are necessary as long as the ambient temperature inside the rack area does not exceed approximately 40°C (104°F).

Sympathetic Vibration

Sympathetic vibration from other equipment (cables, etc.,) in the rack may be serious enough to interfere with the unit’s sound quality out in the listening area. The use of thin card stock and/or felt or foam weather-stripping type materials between adjacent vibrating surfaces, or tying

up loose cables, etc., may be required to stop vibrations external to the unit.

Mechanical Bracing

The chassis is securely attached to the front panel at eight points along its surface, not just at the four corners of the chassis ears. This feature will reduce or eliminate rear bracing requirements in many mobile/portable applications. The weight of internal components is distributed fairly evenly around the unit.

Audio Connections

Connection of the audio feeds is straightforward. Please refer to the system block diagram on page 18 for clarification of the general signal paths into and out of the ATSC/DVB-3 unit.

Inputs are via either BNC or XLR connectors. BNC inputs are 75 avoid mis-matched cable types and other similar causes of undesired reflections in RF signal systems. If severe enough, such reflections

can result in corruption of the digital datastream.

ΩΩ

Ω unbalanced; XLRs are 110

ΩΩ

Ω balanced. Care should be exercised to

ΩΩ

AC Power

The unit's AC mains connection is via a standard IEC inlet, with safety ground connected directly to the unit's chassis. The universal AC input (100-240VAC, 50/60Hz) switching power supply is a self-resetting sealed type, with automatic over-voltage and over-current shutdown. There is no user-replaceable fuse in either the primary or secondary circuit.

+ 14 hidden pages

Wohler ATSC/DVB-3 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual