Wohler AMP2-V2DA User Manual

AMP2-V2DA

2U Digital/Analog Audio Speaker Monitor

with Two AES Inputs on BNC and XLR, Four Analog

Inputs on Phoenix, Four Analog Outputs From AES

on Phoenix, Selected Analog Stereo Outpts on XLR,

Four 53-Segment Level Meters, and Phase Indication

Document P/N 821539 Rev. A

User Manual

CONTENTS

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

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

Section 1: General Features and Specs ..................

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

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

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

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

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

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

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

General Technical Observations ......................................................

AES/EBU to Analog Converter PCB (919050) Description ............

Level Meter Settings and Specifications ...........................................

Level Meter Bargraph "0" (Zero) Fine Adjustment ..........................

Level Generator (919126) and LED Driver (919110) PCB

Descriptions .....................................................................................

AMP2-V2DA Interconnect 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

AMP2-V2DA User Manual P/N 821539 Rev-A

General Features

and Specifications

Sect. 1: General Features and Specifications

Section 1

Description Features Applications

Specifications

AMP2-V2DA User Manual P/N 821539 Rev-A

Powered Analog/DigitalAudio Monitor

Section 1: General Features and Specifications

AMP2-V2DA

WOHLER

TECHNOLOGIES

POWER

SOURCE

8 6 4 2 0 2

10 12

15 18

22 26 30 35 40

ANALOG

DIGITAL

LEFT SPKR

32 4

SOURCE

FAST

PHASE

AVG

AES 1

AES 2

1 43

RIGHT SPKR

SOURCE

8 6 4 2 0 2

10 12

15 18 22 26 30 35 40 50

AMP2-V2DA

DIGITAL AUDIO

MONITOR PANEL

AMP2-SDA Front Panel

Description

The AMP2-V2DA is a complete, exceptionally high quality AES digital/analog stereo audio monitoring system in a compact, two rackspace cabinet. It contains three audiophile-quality drivers and three power amplifiers; two amplifiers (and two speakers) that reproduce midrange and high frequency information in stereo, and a third amp/driver combination (and speaker) that handles summed Low Frequency (LF) information below the 500 Hz crossover point. The AMP2 series unique audio design has two important advantages. First, it provides optimally focused sound in an Ultra Near Field tm (1 to 3 feet) environment. This allows higher SPL for the operator while reducing overall ambient sound and adjacent bay crosstalk. Second, electronic rather than acoustic cancellation of bass frequencies provides positive audible detection of reversed polarity (“out of phase”) audio feeds. A unique LED display also visually shows “phase” (polarity) relationships of signals selected for monitoring.

All AMP2 Digital models come equipped with a ganged stereo volume control and balance pot, power indication LED, and headphone output. Output limiter circuits are incorporated to protect the speakers, and extensive magnetic shielding allows placement immediately adjacent to video monitors with no color impurities.

The AMP2-V2DA is an analog and digital (AES/EBU) audio monitor capable of audibly monitoring two of four selected source channels through it's stereo speaker system while simultaneously visually monitoring all four channels of the selected source via four LED bargraph level meters. A toggle switch on the front panel allows selection between analog or AES digital input sources. Two four-position rotary switches on the front panel are used to independently assign any two of the selected four channels to the left and right speakers. AES signal status is indicated by two bi-color (red/green) LEDs.

The rear panel features two AES inputs on unbalanced BNC connectors, two AES loop-through outputs on unbalanced BNC connectors, two AES inputs on balanced XLR connectors, four analog inputs on balanced Phoenix connectors, four analog outputs of the AES source on Phoenix connectors, and a stereo analog output of the two channels assigned to the left and right speakers on two balanced XLR connectors.

Four high-resolution 53-segment tri-color LED bargraph level meters display the audio levels for the left and right selected sources. Wohler Technologies proprietary three-LED stereo phase indication feature allows monitoring of phase relationships of the selected stereo inputs.

• 104 dB SPL at two feet

• Only two rack spaces high

• Excellent high frequency response for positive detection of background whine and noise

• Audible and visual indication of phase/polarity problems

• Thorough magnetic shielding for placement next to video monitors

• Four high-resolution 53-segment tri-color LED bargraph level meters

• AES/EBU inputs on two unbalanced BNC connectors with loop-through outputs on two unbalanced BNC connectors

• AES/EBU inputs on two balanced XLR connectors

• Analog inputs on four balanced Phoenix connectors

Features

• Analog outputs (converted from the AES inputs) on four Phoenix connectors

• Analog outputs of source selected for speaker monitoring on two balanced XLR connectors

• Two 4-position speaker assign selection switches

• Two AES signal status indication LEDs

• Digital/analog source selection via front panel toggle switch

• Headphone output

• Power indication LED

• Numerous control and input options

• Quick and easy installation: simply slide in the rack and

connect audio and AC power

AMP2-V2DA User Manual P/N 821539 Rev-A Section 1: General Features and Specifications

Applications

The AMP2-V2DA 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 AMP2-V2DA is backed by a strong warranty and a satisfaction guaranteed return policy.

General Specifications

Input Connectors:

Analog Input impedance: AES Input impedance:

Peak Acoustic Out (@ 2 ft.):

Power output,

ΩΩ

Ω):

ΩΩ

Ω):

ΩΩ

RMS Each Side (4 RMS Bass (4

Frequency Response, Sixth Octave:

Input Level for Maximum Output (Volume Full On):

Hum and Noise (analog):

Distortion, Electrical:

Distortion, Acoustic:

Input Overload:

Converted analog out S/N:

Converted analog out THD:

AES=BNC and XLR / Analog=Phoenix

Phoenix: 200K Ω, balanced BNC: 75 Ω, unbal. / XLR: 110 Ω, bal.

104 dB SPL

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

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

0 dBv balanced / -10 dB unbalanced

Better than -68 dB below full output

Less than 0.15% at any level below input threshold

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

+26 dBv balanced

>90 dB

<0.008%

AES Input Specifications

AES termination:

AES sampling rate:

D to A converter:

D to A gain calibration, (dBFS = dB):

Level Meter Specifications

Level meter type:

Meter dynamics:

Dynamics modes:

Level gain:

Dynamic range:

Midscale resolution:

Segment colors:

Scale:

Segment size:

DIP switch selectable

32-48 kHz, auto-select

18-bit low jitter

DIP switch selectable;

-18=0, -9=+6, -20=+4, -20=+8

53-Segment LED bargraph . VU (bar) and/or PPM (dot), select

PPM: 20 dB decay in 1.5 sec. 3 sec hold VU: 3 sec. hold

0, +4, +6, +8 dBu, select

65 dB

1 dB

Tricolor (green, amber, red)

+16 to -50 dB

.158" x .04" (4.0132 x 1.016 mm)

or 10 sec. hold

Magnetic shielding:

Power consumption (Average Maximum):

AC Mains input:

<0.8 Gauss any adjacent surface

45 W

100-240VAC, 50-60 Hz Universal

Physical Specifications

Weight:

Dimensions (HxWxD):

18 lbs. (8.2 kg)

3.5 x 19 x 12 inches (89 x 483 x 305 mm)

Custom combinations of connectors, controls and level meters are available by special order.

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 UL and CE. 0 dbV ref. 0.775V RMS. Features and specifications subject to improvement without notice.

10k

AMP2-V2DA User Manual P/N 821539 Rev-A

Section 2

Operation

Installation

Front Panel Features

Rear Panel Features

AMP2-V2DA User Manual P/N 821539 Rev-A Section 2: Operation

+ 18 hidden pages

Wohler AMP2-V2DA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual