Wohler SUM Series User manual

World Leader of In-Rack, Audio, Video, Data Monitoring, and Closed Captioning Solutions

CONFIDENCE IS EVERYTHING.™

SUM Series

•AMP1ASUM6/RD •VMDA-SUM8

1RU Summing Audio Monitors

User Guide

Part Number 821025, Revision C

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Last Update

April 7, 2010

SUM Series User Guide

Introduction

Overview

The SUM Series of audio monitors provide self-powered, full-fidelity

stereo or monaural monitoring in a single (1U) industry standard rack-

space mount. The AMP1A-SUM6/RD model features speakers driven

by three power amplifiers: two amplifier/driver combinations to

handle midrange and high frequency information in stereo, while a

third center channel reproduces information below the 500 Hz

crossover point for reproduction through the woofer. The

AMP1A-SUM6/RD model, has two midrange and one woofer speaker

in a 6.5” depth. The VMDA-SUM8 provides either analog or AES

digital inputs, summed as mono or stereo through two amplifier/

drivers in an ultr-shallow 4.5” depth.

Topics

Topics Page

Introduction 1

Safety Instructions 2

Installation Recommendations 3

Features 4

Applications 6

Specifications 6

Front Panel Controls 7

Rear Panel Connectors 10

Technical Functional Overview 12

SUM Series User Guide

Safety Instructions

1. Read, keep, and follow all of these instructions; heed all warnings.

2. Do not use this equipment near water or moisture.

3. Use only a dry cloth to clean the equipment.

4. Do not block any ventilation openings. Install only in accordance

with the instructions in the section entitled, “Installation

Recommendations” on page 6.

5. Do not install near any heat source such as a radiator, heat register,

amplifier, or stove.

6. Do not attempt to plug the unit into a two-blade outlet (with only

two prongs of equal width).

7. Protect the power cord from being walked on or pinched,

particularly at plug’s source on the equipment and at the socket.

8. Use only the attachments/accessories specified by the

manufacturer.

9. Unplug the equipment during lightning storms or when unused

for long periods of time.

10. Refer all servicing to qualified service personnel. Servicing will be

required under all of the following conditions:

•The equipment has been damaged in any way, such as when

the power-supply cord or plug is damaged.

•Liquid had been spilled or objects have fallen onto the

equipment.

•The equipment has been exposed to rain or moisture.

•The equipment does not operate normally.

•The equipment has been dropped.

IMPORTANT: By design, these monitors will only plug into a three-prong outlet for

your safety. If the plug does not fit into your outlet, contact an

electrician to replace the obsolete outlet.

SUM Series User Guide

Installation Recommendations

Mounting

The unit is designed to install into a standard 19" rack mounted at eye

level for best visual observation of the monitor screens.

Heat Dissipation

The ambient temperature inside the mounting enclosure should not

exceed 40°Celsius (104°Fahrenheit). Adjacent devices can be rack

mounted (or stacked) in proximity to the unit if the above temperature

is not exceeded. Allow a 1RU (1.75”/44.45mm) space above and below

the unit for air circulation.

Power

The unit comes with a standard 24VDC/3.0A internal power supply

and connects an A/C mains power source (65W, 100 to 240 VAC, 50/

60Hz) to the IEC connector provided on the rear panel of the unit.

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.

Important: To reduce noise, the monitor have any fans. As a result, the heat

generated by the class D power amplifiers, power supplies, and other

components is vented by slots in the side of the unit. Therefore, as a

safety precaution, we advise you to be sure to allow proper ventilation

on both sides of the unit.

SUM Series User Guide

Features

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 interconnect block diagram on page 15 for clarifi cation of the

general signal paths into and out of the VMDA-SUM8 unit. Care should

be exercised to avoid mismatched cable types and other similar causes

of undesired refl ections in RF signal systems.

Electrical Interference

As with any audio equipment, maximum immunity from electrical

interference requires the use of shielded cable; however, satisfactory

results can sometimes be obtained without it. The internal circuitry

common is connected to the chassis.

Features

Common

•Only one rack space high

•Separate volume control for each channel

•Headphone output jack

•Fits in a 1U standard 19" rack space with a depth of only 4.5"

•Minimal power dissipation for a low operating temperature

SUM Series User Guide

Features

•Low power consumption

•Power indication LED

•Excellent high frequency response for positive detection of

background whine and noise

•Audible indication of phase/polarity problems

•Thorough magnetic shielding for placement next to video monitors

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

audio and AC power

VMDA-SUM8 Features

•Master volume control

•Balanced mono output of the selected channels on a 1/4" phone jack

•LED indication of input signal type (digital or analog)

•LED indication of digital input signal lock status

•Analog inputs on a DB-25 connector

•Digital inputs on four female BNC connectors

•Termination select for each digital input connector

•Gain calibration adjustment of digital input signal pairs

AMP1A SUM6/RD Features

•Separate volume controls for each of the six inputs a on a DB-25

connector

•98 dB SPL at two feet

SUM Series User Guide

Applications

The SUM Series monitors 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.

Specifications

Table 1–1 SUM Series Specifications

Specification AMP1 SUM6/RD VMDA-SUM8

AES/EBU Inputs — 4 on BNC (Unbalanced)

Digital Input Termination — 75 

Digital Input Sampling

Rate —Auto detection between

32 and 96 kHz

Digital Input Level for Full

Output — -20 dBfs

Analog Inputs 6 on DB-25 (Balanced) 8 on DB-25 (Balanced)

Analog Input Impedance 200k Balanced) 100k (Balanced)

Analog Input Level for

Full Output

0 dBv Balanced

-10 dB Unbalanced 0 dBv

Balanced Program Output

1/4" Phono Jack, Mono, retains mix balance, 0 dBv out at

0 dBv in under balanced conditions/max volume

settings.

Hum and Noise Better than -68 dB below

full output

Better than -70 dB below

full output

Electrical Distortion: < 0.15% at any level below

limit threshold

<0.3% below limiting

threshold

Acoustical Frequency

Response

80 Hz - 16 kHz ± 7 dB)

(-10 dB @ 50 Hz, 22 kHZ) 300 Hz to 10k Hz (± 6 dB)

Acoustical Distortion 8% or less worst case;

typically < 2% above 180 Hz

Typically <2% at operating

levels below limiting

threshold, 300 Hz to 10k Hz

Peak Acoustical Output 90 dB SPL at 2 feet 80 dB SPL at 2 feet

SUM Series User Guide

Front Panel Controls

Common Controls

•Speakers (Left and Right): The VMDA-SUM8 internal speaker

system is comprised of two mid-range speakers capable of stereo or

mono reproduction. The internal speaker system for the AMP1A-

SUM6/RD model, to accomodate the reduced depth dimension, is

comprised of two woofer speakers (center) and two mid-range

tweeter speakers (left and right). The two mid-range speaker

channels reproduce, in stereo, only the mid and high frequencies

while the woofer speaker(s) monorally reproduce the low

frequencies.

•Headphone Jack: Select the headphone audio sources as you

would for the internal speakers. When you plug in headphones, the

speakers will mute. This jack accepts a standard 1/4” phone type

stereo plug as shown in Figure 1–1 below.

•Power LED: This LED glows green to indicate that the mains

powered 24V power supply is connected to the power connector on

the rear panel.

Power output:

RMS Each Side

RMS Bass

10 W transient / 5 W

continuous

10 W transient / 5 W

continuous

10 W transient / 5 W

continuous

Power (CE and UL

approved) 100 to 240VAC, 50/60 Hz

Power Consumption 35 W 45 W

Dimensions 1.75 x 19 x 6.5 inches

(44.5x 483 x 165.1 mm)

1.75 x 19 x 4.5 inches

(44.5x 483 x 114.3 mm)

Weight 5 lbs. (2.27 kg ) 2.75 lbs. (1.25 kg)

Magnetic Shielding <1 gauss any adjacent

surface

<2 gauss any adjacent

surface

Table 1–1 SUM Series Specifications

Specification AMP1 SUM6/RD VMDA-SUM8

SUM Series User Guide

Front Panel Controls

AMP1A SUM6RD-Specific Controls

Figure 1–1 AMP1A SUM6/RD Front Panel

•Volume(Channels 1 to 3): These three controls independently affect

the loudness of each of the first three source channels (1, 2 and 3),

which are electronically summed together for reproduction from

the left internal speaker (or left headphone, if connected).

•Volume (Channels 4 to 6): These three controls independently

affect the loudness of each of the second three source channels (4, 5,

and 6), which are electronically summed together for reproduction

from the right internal speaker (or right headphone, if connected).

VMDA SUM8-Specific Controls

Figure 1–2 VMDA SUM8 Front Panel

•Master Volume Control: Turning this recessed trim-pot clock-wise

increases the volume of the entire mix; when turned counter-

clockwise it is decreased. Note that this control comes after the mix

as set by the individual Input Source Volume Controls, so that the

volume balance between channels (the mix) is maintained

throughout master volume adjustment. Factory setting is full

volume.

Speakers

Volume

Headphones

Power

Speakers

Volume

Headphones

Analog/Digital Select and AES Lock

Power

Master Volume

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