MAGNEPLANAR Magneplanar 3.7i Manual de usuario

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Magneplanar 3.7i Instruction Manual

Table of Contents

Quick Set-up Instructions 2

Introduction 3

General Description 3

Carton Contents 3

Packaging 3

Assembly 3

Hookup 4

Caution 4

Speaker Placement 4

Bass Response 4

Left/Right 5

Stereo Width and Imaging 5

Phasing 6

Room Acoustics 7

Optional Tweeter or Midrange Attenuation 7

Specications 8

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Quick Set-up Instructions

The 3.7i has exceptional phase characteristics that are accomplished without the

use of compensation networks. To realize the optimum phasing, the 3.7i should be

angled inward as shown in the diagrams in the manual. (Do not place parallel to

the front wall.) For a larger "sweet spot" and multiple listeners, place tweeters on

the outside. Single listeners may choose to place the tweeters on the inside. If you

do, cant the speakers inward suﬃciently so that the tweeter is not ahead of the

bass and midrange in time as shown in the diagrams below. Whether the

tweeter is on the inside or outside, the tweeter should not be closer to the

listener than the bass section. Measuring from your seated position, if the

bass panel is 10 feet, 6 inches, the tweeter should be at least 10 feet, 7 inches

(think in distance, not angles).

Tweeter attenuation may be necessary for rooms with hard, reective walls. See

Section 14 below.

Your 3.7is have been shipped with the tweeters disconnected.

You must install a resistor or jumper for the operation of the tweeters. Most

listening rooms will have the smoothest response when using the enclosed 1 ohm

resistors for the tweeter and midrange. Rooms that are large and/or overly-

damped may require the enclosed jumper for smooth response.

The 3.7i provides more options for getting the bass just right for your particular

room. There is no one-size-ts-all for every room. The 3.7i has provisions to adjust

the relative levels of the bass, midrange and tweeter. The default position for most

rooms requires attenuation of the midrange and tweeter with resistors. If that

does not achieve a smooth balance in your room, additional bass diaphragm area

can be added with one or more Maggie Bass Panels.

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Introduction

Congratulations on your purchase. The Magneplanar 3.7i loudspeaker was

conceived and designed by perfectionists, for perfectionists. Due to the elegant

simplicity and ruggedness of the design, the Magneplanar 3.7i loudspeaker will

give many years of trouble-free service.

General Description

The 3.7i is a 3-way, full-range ribbon design with a quasi-ribbon bass and

midrange, and true-ribbon tweeter.

Carton Contents

•1 pair 3.7i loudspeakers

•2 each oval base

•8 each screws (6- 1 1/4 inch screws, 2 3/4 inch screws)

•4 each 1 ohm resistors

•2 each jumpers

•2 each Magneplanar logos

•1 each Allen wrench

Packaging

Save all packaging. If you need to transport the speakers, they can be shipped

safely only in the original packaging. You may never have to return your

loudspeakers, but should the occasion arise, they should not be shipped in any

packaging but the original. Should you discard it, packaging is available.

Assembly

This will require the help of an assistant. Lay the speaker face down on a fabric-

covered table, or as an alternative, carefully lay the speaker on its side. Attach the

L-shaped brackets to the oval base and to the speaker panel using only the

shorter length screws as shown in the diagram. Next, install the supporting braces

with the longer length screws for each bracket. To prevent cross-threading the

bolts, install by hand before using a screw-driver. Do not use power tools.

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Hookup

The 3.7i features unique, high current connectors which provide optimum contact

area with the speaker cables up to 10 gauge (or for banana connectors). Simply

strip 1/2" of insulation from the end of the cable. Insert the cable into the terminal

(observing polarity), and tighten the set screws with the Allen wrench provided.

Banana plug connectors can be used and locked in place with the set screws.

Spade lug adapters are available from your Magneplanar dealer for spade

connectors that are incompatible with the Magneplanar high current connector.

Caution

The terminal plate states a maximum fuse value of 5 amps Type 3AG ("normal" or

"fast blow") for the midrange and 2 1/2 amps for the tweeter. The bass section

does not require fusing protection. This fuse value should never be increased or

bypassed. Do not use slow-blow fuses. BURNED OUT MIDRANGE OR TWEETERS

ARE NOT COVERED UNDER THE WARRANTY.

Speaker Placement

Proper speaker placement and room acoustics can have a greater eﬀect on a

music system than upgrading one of the components in the system.

Unfortunately, there is no denitive guideline which will cover all possible

listening rooms. Some experimentation is required for locating the optimum

position. The following are a few general guidelines:

Bass Response

Play a CD with repetitive bass. Try the speakers in several possible locations in the

room. Begin experimenting with the speakers about 3 feet from the front wall. Try

moving the speakers forward or backward in increments of 6 to 12 inches. One

position in the room should be noticeably better than others. Also experiment

with your listening location to avoid standing waves.

Need more bass?

Most of the area of any full-range Maggie is devoted to bass reproduction. (In the

case of the 20.7, 76% of the total radiating area is devoted to bass.) The

Magneplanar Bass Panel oﬀers you the exibility to add bass diaphragm area to t

the needs of your room. From the $600 pair MMG to the 20.7, the Maggie Bass

Panel can get the bass/midbass "just right".

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Left/Right

The 3.7i's are matched pairs and mirror-imaged. The tweeters are located in the

narrow fabric section.

Stereo Width and Imaging

Once you have located the best position for the speakers and your chair for bass

performance, separate the speakers by 50-60% of the distance from your chair to

the speakers. For example, if your chair is 10 feet from the speakers, move the

speakers 5-6 feet apart. Now, move the speakers apart in increments of 3 or 4

inches at a time, listening carefully at each position. At some point you will start to

hear two separate speakers instead of a stage eﬀect or continuous image. When

this occurs, your speakers are too far apart. Begin moving the speakers back in

small increments until you notice a point at which you achieve one cohesive

sound stage.

Depending upon the acoustics of your room, the imaging and sound stage may

be better with the tweeters on the inside for listening only in the "sweet spot". For

a larger audience or listening oﬀto one side, tweeters on the outside will keep the

image centered for those listening oﬀ-axis. Angle the speakers as shown in Figures

1 or 2.

FIG. 1

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FIG. 2

Phasing

The Magneplanar 3.7i has superior phase characteristics. We suggest you resist the

tendency to place the speakers so they are parallel to the front wall. For optimum

phasing, the speakers should angled as shown in Figures 1 or 2.

Once you have located the ideal speaker position, a mark is helpful for quickly

replacing the speakers. A small tack, yarn woven into the carpet, or piece of tape

can be placed on the carpet so your ideal listening spot can be easily relocated

when the speakers (or chair) are moved for cleaning, etc. In the event your ideal

listening spot is inconvenient from the standpoint of the room layout and decor,

simply slide the speakers wherever they look best. For background listening the

speakers can be placed close to the wall and it will make little diﬀerence.

The entire placement procedure may seem like a great deal of work, but is

necessary in the setup of any high quality system. The time and eﬀort expended

should be necessary only once, and will repay the owner with countless hours of

musical enjoyment.

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Room Acoustics

The judicious use of damping material can improve the sound. Acoustical

damping can be achieved with household items or wall hangings. A word of

caution--when audiophiles discover the eﬀectiveness of damping material, they

sometimes overdo it (on the premise that if a little is good, more is better). Before

making a permanent change to your room, experiment with the positioning of

the damping material. Usually a portion of one or two parallel walls should have

some damping. However, it is a trial-and-error process.

An over-damped room will provide very precise imaging, but the sound will seem

"dead." An under-damped room may heighten the illusion of being in a concert

hall, but the imaging will seem imprecise with all the instruments mixed together.

"Hardness" or over-bright sound is usually the result of a room with hard surfaces

(glass, hard paneling,etc.). Moderation is the key.

Diﬀusers are also helpful to improve the acoustics of a room. Contact your

Magnepan dealer for more information on the proper use of diﬀusers.

Optional Tweeter or Midrange Attenuation

To attenuate the tweeter or midrange, remove the jumper(s) and install a resistor.

The 1 ohm resistor is the standard tweeter and midrange resistor values. Other

tweeter and midrange resistor values are available from your Magneplanar dealer.

In addition to the tweeter resistor, installing the 1 ohm midrange resistor will also

provide a "warmer" balance.

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Specications

* Because there are no universally accepted methods for loudspeaker

measurements, frequency response specications may be stated by most

manufacturers without reference to measurement techniques and/or specic

locations in rooms. Magneplanar loudspeaker frequency response specications

are average performance levels that may reasonably be expected in normal

installations.

System

Description

3-Way, full-range, ribbon speaker with quasi-ribbon midrange and

quasi-ribbon bass and true ribbon tweeter.

Frequency

Response

35Hz--40 kHz

Sensitivity

86 dB, 500Hz, 1 meter, 2.83V

Impedance

Nominal 4 Ohms

Dimensions

24 W x 71 H x 1 5/8 D inches

Warranty

LIMITED. 3 years to original owner. 1 year on ribbon tweeter.

Shipping

Weight

125 lbs.

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