Wohler AMP2-AMVU, AMP2-AMPPM User Manual

AMP2-AM Series

(AMP2-AMVU and AMP2-AMPPM)

2U Analog Monitor Speaker Unit with Two VU Two Balanced and Two Unbalanced Inputs,

Two Loop-Thru Outputs, and Phase Indication

or PPM Mechanical Level Meters,

Document P/N 821540 Rev. A

User Manual

CONTENTS

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

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

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

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

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

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

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

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

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

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

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

PPM Meter Specifications and Level Threshold Settings ............

VU Meter Specifications and Level Threshold Adjustment .........

AMP2-VM Series 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-AM Series User Manual P/N 821540 Rev-A

General Features

and Specifications

Sect. 1: General Features and Specifications

Section 1

Description Features Applications

Specifications

AMP2-AM Series User Manual P/N 821540 Rev-A

Section 1: General Features and Specifications

AMP2-AM Series

Powered Analog Audio Monitor

Featuring Models: AMP2-AMVU and AMP2-AMPPM

PHASE

AVG

POWER

WOHLER

TECHNOLOGIES

AMP2-AMVU or AMP2-AMPPM Front Panel

Description

The AMP2-AM series analog monitor is a complete, exceptionally high quality 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 the signals being monitored.

FAST-OUTFAST-IN

AMP2-AM

ANALOG AUDIO

MONITOR PANEL

All AMP2 series monitors 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-AM series models are specifically intended for those who prefer mechanical level meters when visually monitoring audio signals. These units are capable of audibly monitoring two analog source channels through their stereo speaker systems while simultaneously visually monitoring both channels via the two front panel mounted premium quality mechanical level meters. The AMP2-AMVU model utilizes mechanical meters exhibiting VU ballistic characteristics while the AMP2-AMPPM model utilizes mechanical meters exhibiting PPM ballistic characteristics with a choice of EBU or BBC scales..

Rear panel features on both models include two analog inputs on balanced XLR connectors, two loop-through outputs on two XLR connectors, and two analog inputs on unbalanced RCA phono connectors.

Features

• 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

• Two front panel mounted mechanical level meters:

AMP2-PPM

• 2 Premium PPM Meters (EBU or BBC Scales)

AMP2-AMVU

• 2 Premium Quality VU Meters

• Two analog inputs on unbalanced XLR connectors

• Two analog loop-through outputs on unbalanced XLR connectors

• Two analog inputs on unbalanced RCA phono connectors

• Headphone output

• Power indication LED

• Thorough magnetic shielding

• Numerous control and input options

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

connect audio and AC power

AMP2-AM Series User Manual P/N 821540 Rev-A Section 1: General Features and Specifications

Applications

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

General Specifications

Input Connectors:

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):

Analog Input impedance:

Hum and Noise (analog):

Distortion, Electrical:

Distortion, Acoustic:

Input Overload:

XLR (balanced) and RCA (unbalanced)

104 dB SPL

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

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

0 dBv balanced / -10 dB unbalanced

200K Ω, balanced / 40K Ω, 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

Converted analog out S/N:

Converted analog out THD:

Magnetic shielding:

>90 dB

<0.008%

<0.8 Gauss any adjacent surface

Power consumption (Average Maximum):

AC Mains input:

Weight

Dimensions (HxWxD):

45 W

100-240VAC, 50-60 Hz Universal

18 lbs. (8.2 kg)

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

Note: See page 17 for level meter specifications

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-AM Series User Manual P/N 821540 Rev-A

+ 14 hidden pages

Wohler AMP2-AMVU, AMP2-AMPPM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual