Wohler AMP2-VSD, AMP2-VSDA User Manual

AMP2-VSD and AMP2-VSDA

2U Digital Audio Speaker Monitor

With SDI Input and Output on BNC, Two AES Inputs on

BNC and XLR, Two AES Outputs From SDI on BNC, Four

Analog Inputs on XLR (-VSDA Only), Two Selected Analog

Stereo Outs on XLR, Four High-Res 53-Segment Level Meters,

Summable Channel Assignment, and Phase Indication

Document P/N 821581 Rev-B

User Manual

CONTENTS

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

Important Safety Instructions and 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 Observations .................................................................

SDI to AES Converter Module (919096) ..................................................

AES to Analog Converter Module PCB (919050) ......................................

AES Digital Gain Calibration Fine Adjustment (919050) .............................

AES Error Jumper Locations (919050) ......................................................

Level Meter Rear Panel 6-Position DIP Switch Settings ..............................

Level Meter Internal 10-Position DIP Switch Settings .................................

Level Meter DIP Switch Locations ............................................................

Level Meter Alternative Scales ..................................................................

Level Meter Phase Correlation Featrure .....................................................

AMP2-VSD Interconnect Block Diagram ..................................................

AMP2-VSDA 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-VSD and AMP2-VSDA User Manual P/N 821581 Rev-B

Section 1

General Features

and Specifications

Description

Features

Applications

Specifications

Installation

Sect. 1: General Features and Specifications

Congratulations on your selection of a Wohler Technologies AMP2-VSD or AMP2-VSDA audio monitor unit. 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:

AMP2-VSD and AMP2-VSDA User Manual P/N 821581 Rev-B

Section 1: Features, Specs, and Installation

AMP2-VSD and AMP2-VSDA

Powered Audio Monitors

AMP2-VSD Front Panel

AMP2-VSDA Front Panel

Description

The AMP2-VSD and AMP2-VSDA are monitors capable of audibly monitoring up to four source channels through a stereo speaker system while simultaneously visually monitoring all four channels of the selected source via four high-resolution 53-segment LED bargraph level meters. Both models process digital AES and SDI audio signals, while the AMP2-VSDA is also capable of processing up to four analog audio signals. Two banks of four buttons on the front panel are used to independently assign from one to four (summed) channels to each of the two (left and right) speaker channels. AES signal status is indicated by two bi-color (red/ green) LEDs. SDI signal status is indicated by one bi-color (red/green) LED. Features include 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. Wohler Technologies proprietary three-LED stereo phase indication feature allows monitoring of phase relationships of the selected stereo inputs.

Rear panels for these monitors feature an SDI input and loop-through on BNC connectors, two AES inputs on unbalanced BNC connectors, two alternate AES inputs on balanced XLR connectors, two AES outputs (converted from the SDI input) on BNC connectors, and a stereo analog output of the channels assigned to the left and right speakers on two balanced XLR connectors. The AMP2-VSDA additionally features four analog inputs on balanced female XLR connectors.

All AMP2 Series units contain 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.

• 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 53-segment high-resolution tri-color bargraph level meters:

-Selectable Input Referrence Level (0, +4, +6, or +8 dBu)

-Selectable Display Mode (VU Only, VU/PPM, or PPM Only)

-Selectable Peak Hold (Manual, 3-Second, 10-Second, or Off)

-Selectable PPM Ballistics (Type I, Type II, DIN 45406, or SSRT)

-Selectable alternate Bargraph Scales (Extended VU, VU, BBC, NORDIC, or DIN)

-Selectable Phase Correlation feature

• SDI input and loop-through on unbalanced BNC connectors

Features

• Two AES/EBU inputs on unbalanced BNC connectors

• Two alternate AES/EBU inputs on balanced XLR connectors

• Four analog inputs on balanced XLR connectors (AMP2-VSDA only)

• Two AES outputs (converted from SDI input) on BNC

• Four analog outputs (from selected digital source) on Phoenix

• Stereo analog output of the channels monitored by the left and right speakers on two balanced XLR connectors

• Two banks of four push buttons for assigning single or

summed channels to the left and right speaker

• Select AES or SDI input source via a front panel toggle switch

• Select analog or selected digital source via front panel switch

• One SDI signal status/error indication LED

• Two AES signal status/error indication LEDs

• Headphone output

• Power indication LED

AMP2-VSD and AMP2-VSDA User Manual P/N 821581 Rev-B Section 1: Features, Specs, and Installation

Applications

The AMP2-VSD and AMP2-VSDA are 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., both models are backed by a strong warranty and a satisfaction guaranteed return policy.

General Specifications

Input Connectors:

Analog Input Impedance: Digital Input Impedance:

Peak Acoustic Out (@ 2 ft.):

Power Output,

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:

ΩΩ

Ω):

ΩΩ

Ω):

ΩΩ

SDI: BNC, AES: BNC/XLR, Analog: XLR

XLR: 70K Ω, bal. (AMP2-VSDA Only) 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

Level Meter Specifications

Level Meter Type:

Display Modes (select):

Peak Hold (select):

PPM Ballistics (select):

Reference Levels:

Phase Correlation:

Bargraph Scales:

Dynamic Range:

Midscale Resolution:

Segment Colors:

Scale:

Segment Size:

Physical Specifications

53-Segment tri-color (R,A,G) LED

VU, PPM, or VU/PPM

Manual, 3-sec, 10-sec, or OFF

Type 1, Type 2, DIN 45406, or SSRT

0, +4, +6, +8 dBu (DIP selectable)

ON or OFF

VU, Ext. VU, BBC, NORDIC, or DIN

65 dB

1 dB

Tricolor (green, amber, red)

+16 to -50 dB

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

Converted Analog Out THD:

Magnetic Shielding:

Power Consumption (Average Maximum):

AC Mains Input:

+10

-10

-20

-30

<0.008%

<0.8 Gauss any adjacent surface

45 W

100-240VAC, 50-60 Hz Universal

Audio Response Curve

Typical 1/6 Octave Audio Response Curve

Weight:

Dimensions (HxWxD):

18 lbs. (8.2 kg)

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

NOTE: For SDI specifications see page 19. For AES specifications see page 20.

2k1k50020010050 20k20

10k

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.

AMP2-VSD and AMP2-VSDA User Manual P/N 821581 Rev-B

Section 1: Features, Specs, and Installation

Installation

Mounting

The unit should be mounted where convenient for operating persons, ideally at approximately ear/eye level for best high frequency response and visual observation of the level meters. 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

Even though the unit is fairly heavy, 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 interconnect block diagram on pages 27 and 28 for clarification of the general signal paths into and out of the unit.

Care should be exercised to avoid mismatched 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.

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.

AMP2-VSD and AMP2-VSDA User Manual P/N 821581 Rev-B

Section 2

Operation

Front Panel Features

Rear Panel Features

Audio Amplifier and Speaker Configuration

Balance Control Characteristics

AMP2-VSD and AMP2-VSDA User Manual P/N 821581 Rev-B

Section 2: Operation

Front Panel Features

Please refer to Figure-2a on the facing page to familiarize yourself with the front panel features of the AMP2-VSD and AMP2-VSDA units. The following sections describe these features and are referenced, by number, to Figure-2a.

Speakers

The AMP2 Series monitors feature two mid-range speakers (left and right) and one woofer speaker. Two amplifier/driver combinations handle midrange and high frequency information in the left and right (stereo) speaker channels, while the third channel reproduces and sums the left and right channel information below the 500 Hz crossover point in the woofer (bass) speaker. Note that the woofer channel is NOT a dedicated LFE (subwoofer) or Center channel. See page 16 for more information concerning the AMP2 Series audio amplifier/speaker configuration.

Audio Level Meter LED Bargraph Displays (1-4)

Audio levels for the four selected source channels are displayed via these four tri-color LED bargraph meters. The four bargraph meters display audio levels for the digital or analog audio sources selected for monitoring. All bargraph LED segments are of the tri-color type (GREEN, AMBER, RED) and are user adjustable for Referrence Level, Display Mode, Peak Hold, PPM Ballistics, Alternate Bargraph Scales, and Phase Correlation via DIP switches on the rear panel and inside the unit. For factory set and user adjustable level meter DIP switch settings, see pages 23 and 24. For more information about the Phase Correlation feature, see page 26. For meter specifications, see page 5.

Headphone Jack

This jack accepts a standard 1/4” phone type stereo headphone plug. Select the headphone audio sources as you would for the internal speakers. When you plug in headphones, the speakers will mute.

Speaker Assign Channel Buttons (Left and Right)

Use the left bank of four buttons to assign one to four of the four available channels for monitoring from the left speaker channel. Use the right bank of four buttons to assign one to four of the four available channels for monitoring from the right speaker channel. Channel buttons toggle On/Off and will light up BLUE to indicate they are selected.

Operation for channel selection for each bank of four buttons is as follows:

Single Channel Select: Press and release a single channel button to select that channel (and deselect any previous

selection). Pressing and releasing the selected channel button again will deselect it.

Multi-Channel Select (Summing): Press and hold down a desired channel button, then press other channel buttons to

add (sum) additional channels (or press any again to deselect). Release all buttons to accept the selection set. When multiple channels are selected, pressing and holding an already selected channel button will allow further modification to the selection set. Releasing all buttons accepts the new selection set. Pressing and immediately releasing an already selected channel button will select only it and deselect all other channel selections. Note that if channels assigned to either the left or right level meters are multi-channel (summed), then the respective level meter will indicate summed audio levels.

If the user presses a previously selected (lighted) channel button, but then decides not to make any changes to the selection set, the user should keep the button depressed for at least 1.5 seconds before releasing it. This will preserve the current selection set as though the button was never pushed.

Power LED

This LED glows GREEN to indicate the unit is connected to mains power and an operation voltage is present.

Volume Control

This controls the loudness of the audio reproduced by the internal speakers or connected headphone. Clock-wise rotation of this control increases the loudness of the monitored audio.

Analog/Digital Source Select Switch (AMP2-VSDA Only)

This two position toggle switch, featured only on the AMP2-VSDA, allows the operator to choose between the two primary input sources; ANALOG or DIGITAL. When this toggle switch is set to ANALOG, the unit will monitor the signals as input on the rear panel ANALOG IN XLR connectors (Item K, page 14). When this toggle switch is set to DIGITAL, the unit will monitor the digital source (AES or SDI) as selected by the AES/SDI Digital Source Select Switch (Item 13, page 10).

Bargraph Brightness Trim Pot

This control is recessed into the front panel and can be accessed using a small screwdriver. Turning it clockwise will increase the relative brightness of all bargraph display LED segments. Adjusting this one control will simultaneously affect the brightness of all bargraph displays on the front panel.

(Continued)

AMP2-VSD and AMP2-VSDA User Manual P/N 821581 Rev-B Section 2: Operation

AMP2-VSDA AMP2-VSD

Figure-2a: Front Panel Features

+ 21 hidden pages

Wohler AMP2-VSD, AMP2-VSDA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual