Wohler AMP1-VS, AMP1-VSA User Manual

AMP1-VS and AMP1-VSA

1U Digital Audio Speaker Monitors

with One SDI Input and One SDI Output on BNC, Four Analog

Outputs (From SDI Input) on Phoenix, Four Analog Inputs

on Phoenix (-VSA Only), Two Analog Outputs of the

Left/Right Channel Selections on XLR, Summable Channel

Assignment, Four 26-Segment Level Meters, and Phase Indication

Document P/N 821613 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 ................................

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

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

SDI to Analog Converter Module PCB (919068) ..........................

SDI D/A Gain Calibration Fine Adjustment (919068) ...................

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 ....................................................

AMP1-VS Interconnect Block Diagram ........................................

AMP1-VSA 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

AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B

Section 1

Features, Specs, and Installation

Description

Features

Applications

Specifications

Installation

Sect. 1: General Features and Specifications

AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B

Section 1: Features , Specs, and Installation

AMP1-VS and AMP1-VSA

Powered Digital Audio Monitors

AMP1-VSA Front Panel

Description

The rackmountable 1U size AMP1-VS and AMP1-VSA models are audio monitors capable of audibly monitoring up to four source channels through their stereo speaker systems while simultaneously visually monitoring all four channels of the selected source via four high-resolution 26-segment LED bargraph level meters. Both models monitor SDI (Serial Digital Interface) audio sources while the AMP1-VSA model can also monitor up to four analog audio sources. 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. SDI signal status is indicated by a bi-color (red/green) LED. Wohler Technologies proprietary three-LED stereo phase indication feature allows monitoring of phase relationships between the left and right speaker channels. Other features include separate volume and balance controls, 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 rear panels of both the AMP1-VS and AMP1-VSA feature one SDI input and one SDI output on unbalanced BNC connectors, four analog outputs (de-embedded from the SDI source) on four Phoenix connectors, and left and right analog outputs (of the channels assigned to the left and right speakers) on two balanced XLR connectors. The AMP1-VSA model additionally features four analog inputs on Phoenix connectors on the rear panel and a toggle switch on the front panel to allow selection between analog or digital SDI input sources.

All AMP1 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 two speakers) that handles summed Low Frequency (LF) information below the 500 Hz crossover point. The AMP1 Series unique audio design has two important advantages. First, it provides optimally focused sound in an Ultra Near Field 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.

(1 to 3 feet) environment. This allows

Features

• 98 dB SPL at two feet

• Only one rack space 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 26-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, DIN, or Custom)

• Two banks of four push buttons for assigning single or summed channels to the left and right speaker

• Headphone output

• Power indication LED

• SDI input and SDI re-clocked output on unbalanced BNC connectors

• SDI signal status indication LED

• Analog inputs on four balanced Phoenix connectors with digital/ analog source select switch on front panel (-VSA only)

• Analog outputs (converted from the SDI input) on four Phoenix connectors

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

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

connect audio and AC power

• Numerous control and input options

AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B Section 1: Features , Specs, and Installation

Applications

The AMP1-VS and AMP1-VSA 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., the AMP1-VS and AMP1-VSA are backed by a strong warranty and a satisfaction guaranteed return policy.

General Specifications

Analog Input Connectors: SDI Input Connectors:

Analog Input impedance: SDI Input impedance:

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:

Phoenix, 4 each (-VSA model only) BNC, 1 each

Phoenix: 200K Ω, balanced BNC: 75 Ω, unbalanced

0 dBv balanced

+26 dBv balanced

98 dB SPL

80 Hz - 16 kHz ± 7 dB) (-10 dB @ 50 Hz, 22 kHZ)

10 W transient / 5 W continuous 20 W transient / 10 W continuous

Less than 0.15% at any level below limit threshold

8% or less at worst case frequencies above 180 Hz including cabinet resonance; typically less than 2%

Level Meter Specifications

Level Meter Type:

Bargraph Quantity:

LED Color:

Metering Range:

Reference Level:

Display Mode Select:

Peak Hold Select:

PPM Ballistics Select:

Calibration:

Scale Select:

Physical Specifications

Weight:

Dimensions (HxWxD):

26-segment tri-color LED bargraph

4 each, vertical

Tricolor (red, amber, green)

62 dB

0, +4, +6, or +8 dBv selectable

VU Only, VU/PPM, or PPM Only

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

Type I, Type II, DIN 4506, or SSRT

Auto

VU, Extended VU, BBC, NORDIC, DIN, or Custom

10 lbs. (4.53 kg)

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

Hum and Noise:

Magnetic Shielding:

Power Consumption

(Average Maximum):

AC Mains input:

+10

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

-10

-20

-30

Better than -68 dB below full output

Less than 1 Gauss any adjacent surface

35 W

100-240VAC, 50-60 Hz

For SDI specifications see page 17.

Audio Response Curve

2k1k50020010050 20k20

Typical 1/6 Octave Audio Response Curve

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.

AMP1-VS and AMP1-VSA User Manual P/N 821613, 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 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 diagrams on pages 23 and 24 for clarification of the general signal paths into and out of the AMP1-VS and AMP1-VSA units.

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.

AMP1-VS and AMP1-VSA User Manual P/N 821613, Rev-B

Section 2

Operation

Front Panel Features

Rear Panel Features

Audio Amplifier and Speaker Configuration

Balance Control Characteristics

AMP1-VS and AMP1-VSA User Manual P/N 821613, 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 AMP1-VS and AMP1-VSA units. The following sections describe these features and are referenced, by number, to Figure-2a.

Speakers

The AMP1-VS and AMP1-VSA feature two mid-range speakers (left and right) and two woofer speakers. 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 two woofer (bass) speakers. Note that the woofer channel is NOT a dedicated LFE (subwoofer) or Center channel. See page

14 for more information concerning the AMP1 Series audio amplifier/speaker configuration.

Headphone Jack

This jack accepts a standard 1/4” phone type stereo plug. When you plug in headphones, the internal 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.

Audio Level Meter LED Bargraph Displays (1-4)

Audio levels for the four source channels are displayed via these four tri-color LED bargraph meters. All bargraph LED segments are of the tri-color type (green, amber, red) and the meters are user adjustable for Reference 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 19 and 20. For meter specifications, see page 5.

Analog/Digital Source Select Switch (-VSA Model Only)

This two position toggle switch selects between the two primary input sources of the AMP1-VSA model; ANALOG or DIGITAL. When this toggle switch is set to ANALOG, the unit will monitor the source signals as input on the rear panel ANALOG IN Phoenix connectors (Item G, page 10). When this toggle switch is set to DIGITAL, the unit will monitor the SDI digital source signals as input on the rear panel SDI IN BNC connectors (Item D, page 12).

Volume Control Pot

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 in the speakers or headphones.

Power LED

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

(Continued)

+ 18 hidden pages

Wohler AMP1-VS, AMP1-VSA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual