Alesis MONITORONEMK2 User Manual

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Owner's Reference Manual

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Alesis Monitor One Mk2 Reference Manual

© Copyright 2001, Alesis Studio Electronics, Inc. All rights reserved. Reproduction in whole or in part is prohibited. “Monitor One”, "Monitor One Mk2" and “Superport” are trademarks of Alesis Studio Electronics, Inc.

ALESIS CONTACT INFORMATION

Alesis Studio Electronics, Inc.

www.alesis.com

E-Mail:info@alesis.com

Website: http://www.alesis.com

table of contents

Thank you!

for purchasing the Alesis Monitor One Mk2™ Studio Reference Monitors. To take full advantage of the Monitor One’s operation, and to enjoy long and trouble-freeuse, please read this user’s manual carefully. We value any comments you may have about this monitor system, this manual, your Alesis dealer and about our factory service. Please takevisita minuteour now to

website at www.alesis.com and register your product.

When something important appears in the manual, an icon (like the one

on the left) will appear in the left margin. This symbol indicates that this information is vital when operating the Monitor Ones.

Table of Contents

 

Important Safety Instructions .........................................

2

Safety symbols used in this product...................................................................

2

Please follow these precautions when using this product: .............................

2

About the Monitor One .................................................

5

About near-fieldmonitoring...............................................................................

7

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

9

Speaker placement................................................................................................

9

Avoid reflections .......................................................................................

9

The listening triangle ..............................................................................

11

Symmetry.................................................................................................

12

Connecting your speakers to an amplifier......................................................

14

Power and Protection.........................................................................................

16

What size power amp should you use?...............................................

16

Should I install a fuse? ............................................................................

16

Specifications and Service ...........................................

17

Specifications........................................................................................................

17

Architectural and Engineer's Specifications.....................................................

19

Maintenance/Repair information.....................................................................

20

Cleaning....................................................................................................

20

Service.......................................................................................................

20

Alesis Limited Warranty..............................................

21

Monitor One Mk2 Reference Manual

1

Important Safety

Instructions

Safety symbols used in this product

This symbol alerts the user that there are important operating and maintenance instructions in the literature accompanying this unit.

Please follow these precautions when using this product:

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 a damp cloth. Do not spray any liquid cleaner onto the faceplate, as this may damage the front panel controls or cause a dangerous condition.

7.Install in accordance with the manufacturer's instructions.

8.Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9.Use only attachments or accessories specified by the manufacturer.

Monitor One Mk2 Reference Manual

2

safety instructions

10.Use only with a cart, stand, bracket, rack, or table designed for use with professional audio or music equipment. In any installation, make sure that injury or damage will not result from cables pulling on the apparatus and its mounting. If a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

11.Unplug this apparatus during lightning storms or when unused for long periods of time.

12.Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as when the power-supplycord 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.

13.This product, in combination with an amplifier and headphones or speakers, may be capable of producing sound levels that could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or at a level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult an audiologist.

Monitor One Mk2 Reference Manual

3

safety instructions

CE Declaration of Conformity

See our website at www.alesis.com

4

Monitor One Mk2 Reference Manual

chapter 1

About the Monitor One

Your new Alesis Monitor One Mk2™ Studio Reference Monitors will deliver accurate mixes in near-fielddigital and analog studio monitoring applications. The Monitor Ones offer wide frequency response, accurate transient reproduction, clear imaging and high power handling capability and were designed by experts with decades of experience in professional loudspeaker design. The original version was a winner of the prestigious TEC Award and became an instant favorite among professional engineers and studio owners. The “Mark 2” edition of this famous product makes a few design and material changes that make it even better while preserving the classic sound of the original.

This speaker system uses a proprietary 6.5" high-powerlow frequency driver with a specialmineral-filledpolypropylene cone. The cone is suspended by a highly damped linear rubber surround with a special edge design to improve midrange frequency response. It has a 1.5" diameter voice coil wound on ahigh-temperatureKapton former, with along-throwvoice coil and magnet.

The 1" high frequency driver employed has a soft natural silk dome and is ferrofluid-cooled.Anewly-designedwaveguide surrounding the dome improves the polar pattern, giving a smootheroff-axisresponse.

Both drivers are now magnetically shielded, allowing the speakers to be mounted close to video and computer screens without distorting the color images.

The system's passive crossover network uses low dielectric loss nonpolarized capacitors and an oversized low-losslow frequency inductor. Bothhigh-passandlow-passsections are truesecond-orderfilters (12 dB/octave) with a crossover at 2 kHz. Rear panel connections are made via5-waybinding posts suited to large diameter wires as well as banana plugs.

The cabinet design uses Alesis' exclusive SuperPort™ speaker venting technology. Most small speakers used for near-fieldmonitoring give disappointing results in their lowest frequency range. They are either sealed (which limits the amount of air the driver can move) or have an undersized vent whose function at low frequencies is nullified by the effect of turbulence in the restricted port tube at loud sound levels. The Monitor One's large

Monitor One Mk2 Reference Manual

5

about the Monitor One • chapter 1

folded SuperPort overcomes this limitation by minimizing vent turbulence at high air velocities, thereby ensuring that the enclosure tuning remains stable, the acoustic output remains linear during heavy low frequency attack transients, and that the reactive load above and below box resonance seen by the driving amplifier does not dynamically shift in frequency. This all translates to tighter bass with higher definition.

The Monitor One's 4 ohm load impedance takes advantage of today's modern professional amplifiers which are generally capable of a 1 to 3 dB increase in output power with 4 ohm loads over their 8 ohm ratings. The result is a similar increase in the Monitor One's acoustic output over conventional 8 ohm monitors. Reliable handling of this additional acoustic output is ensured by the Monitor One's substantial power handling capability. Typical near-fieldmonitors are rated at50-60watts maximum, but the Monitor One carries a 120 watt continuous power rating and has been successfully tested to over 200 watts using the industry standardEIA-426Amethod. This is a rugged speaker system designed for serious professional use.

Covered with a vinyl laminate on the cabinet body and featuring a 1” thick MDF powdercoated front baffle with radiused edges to decrease edge diffraction, the Monitor One Mk2 may be mounted vertically or horizontally.

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Monitor One Mk2 Reference Manual