MAGNEPLANAR MG20.1 Manuel utilisateur

MAGNEPLANAR® MG20.1

Instruction Manual

White Bear Lake, Minnesota

www.magnepan.com

1. INTRODUCTION

Congratulations on your purchase. The Magneplanar® MG2 .1

loudspeaker was conceived and designed for perfectionists. One of the most

revealing loudspeakers made, the MG2 .1 will provide outstanding music

reproduction when used With high quality components.

2. GENERAL DESCRIPTION

Your Magneplanar MG2 .1 speaker system consists of a pair of mirror-

imaged, Fabric and wood trimmed panels, labeled "1'' and "2'' (for identification).

Each panel Contains one, five-foot long ribbon tweeter and one, mid/bass

planar-magnetic driver. The Planar-magnetic driver consists of a quasi ribbon

midrange section and a bass section, employing opposing magnet plates. The

MG2 .1's can be bi-amplified or bi-wired. The midrange to treble crossover

components are housed in the speaker panel and are non- defeatable.

For single amplifier operation, a passive external crossover is supplied.

3. ACCESSORY CARTON CONTENTS

4 - Speaker Support Feet

8 - Speaker Support Bolts

2 - 3 Amp Normal Blow Fuses (Tweeter)

2 - 5 Amp Normal Blow Fuses (Midrange)

4 - Wooden Handles

5 -Black Ribbon Tweeter Mounting Screws

2 - Speaker Emblems

1 - Allen Wrench

2 - 1 Ohm Resistors

4. IMPORTANT PRECAUTION

The foil element in the ribbon tweeter is quite fragile. Handle them with extreme

care when removing them from the carton. DO NOT remove the protective strip

from the ribbon until the MG2 .1 is fully assembled and the tweeters are

installed.

RUPTURED RIBBON ELEMENTS ARE NOT COVERED UNDER THE

WARRANTY.

5. PACKAGING

Save all packaging, including ribbon tweeter packing! If you need to

transport the speaker they can be shipped safely only in the original packaging.

You may never have to ship or move your loudspeakers, but should the occasion

arise, they should not be shipped in any packaging but the original. Should you

discard it, factory packaging is available, including the special packaging for the

ribbon tweeters.

6. ASSEMBLY

You will note there are 4 wooden handles with threaded shafts. These are

for attaching to the back side of the panels (2 each) to facilitate moving the

speakers around. There are holes approximately 26 inches from the lower end of

the panels for mounting these handles.

The four support feet for the MG2 .1 speakers are shipped in the

separate accessory carton along with the eight mounting bolts. Two feet must be

fastened to the back side of each of the panels. The nuts are already installed in

the panels.

A) Lay a speaker on its side as shown in Figure 1. We suggest you

have a second person hold the speakers during installation to

ensure they do not fall.

Figure 1

B) Locate the four holes in the fabric along back side of the panel.

C) Note that one section of the support feet is slightly longer than the

other. Place the longer section toward the front of the speaker.

D) Align the holes in the foot with the holes in the panel. Using your

fingers, insert the bolts through the foot and into the panel until

they engage nuts in the panel. Care should be taken so the bolts

do not cross-thread. Final tightening is done with a No. 2 Phillips

screwdriver.

E) Repeat Steps C & D for the remaining feet.

There are threaded holes on the bottom of each speaker support which

may be used to install spikes for installation on deep carpeting if desired.

. RIBBON TWEETER

The foil element in your MG2 .1 line source tweeter is only . 15" thick,

and is very fragile. Handle with extreme care. PLEASE READ FUSING ON

PAGE 5. To lessen the risk of damage, the ribbon tweeters are shipped

separately. Refer to the following instructions for installation.

RIBBON TWEETER INSTALLATION /

REMOVAL

INSTALLATION

A. Mer the speaker has been stood upright,

install the new ribbon tweeter in the frame.

Serial number label must be at the bottom.

B. Insert the screws. Tighten until snug,

then back off 1/2 revolution.

C. Remove protective cover and attach the

wire to the ribbon terminals.

D. Peel liner from back of end covers and

adhere to each end of tweeter.

REMOVAL

A. Pry away the two end covers.

B. Remove the wire at each end of the

ribbon tweeter.

C. Remove the screws that attach the

ribbon tweeter to the frame and then

remove the tweeter.

CAUTION: Do not bump or touch the ribbon

at end terminals.

TOOLS NEEDED: #2 Phillips Screwdriver

8. FUSING

Your MG2 .1's have been shipped with 3 amp fuses installed for the

tweeter, and 5 amp fuses for the midrange. The fuses are Type 3AG normal

blow fuses, and should never be replaced with slow blow fuses.

The maximum MIDRANGE fuse value shown on the speaker terminal

plate is 5 amps. Under no circumstances should you exceed this value, or use

slow blow fuses- doing so will invalidate your warranty.

"Clean" breaks of the ribbon foil are usually due to metal fatigue and may

be covered under the terms of the warranty. Twisted, distorted or limp foil is

usually caused by excessive power (from improper fusing), or sudden changes in

air pressure and may not be covered under the terms of the warranty.

9. CABLE HOOKUP

The MG2 .1's feature high-current cable connectors which provide

optimum contact area with speaker cables up to 1 gauge. To prepare cables,

strip 1/2-inch of insulation from the end of the cable. Insert the bare wire into the

connector and tighten the set-screw with the Allen wrench provided. Spade lug

adapters are available from your Magneplanar dealer for speaker cables that are

incompatible with the Magneplanar high-current connector.

10. SINGLE AMPLIFIER OPERATION

For single amplifier operation an XO2 .1 Passive Crossover has been

supplied with your speakers.

A. Angle brackets have been provided for attaching the XO2 .1

Crossover to the feet of the MG2 .1's. This will ease moving and

positioning the MG2 .1's. Loosen top screws on back of feet, just enough

to slip angle brackets on. Align the 4 gold connectors on the crossover to

speaker inputs and place crossover on angle bracket. Tighten set screws.

B. Connect the amplifier speaker cables to the input of the XO2 .1

Crossover box.

C. Every connection point on the XO2 .1 Crossover is marked plus (+)

or negative (-). Make a choice as to which lead is either positive or

negative and make sure all connections are consistent with the marking.

DOUBLE-CHECK YOUR CONNECTIONS! One mistake will put your

system out of phase.

D. Bi-Wiring Option. Bi-wiring requires two sets of speaker cables.

They may be identical, or one set may be specialized for high frequencies

and the other specialized for low frequencies.

1. Remove both jumpers on the XO2 .1 Crossover.

2. Connect one set of cables to the low cable input and the other set

to the high cable input. Connect the other end of the cables together

(observe +/- polarity), and connect to one channel of the amplifier outputs.

If frequency specialized cables are used, connect them to their respective

inputs. In either case the other ends are connected to the same amplifier

channel.

3. Repeat same procedure for the other channel.

11. BI-AMPLIFICATION

The MG2 .1 is conveniently arranged for hi-amplification. To hi-amplify,

two stereo amplifiers (four channels of amplification) and an electronic crossover

are required. For hi-amplifying with a conventional electronic crossover, connect

the system as shown in Figure 2.

Set the high pass section at 2 -3 Hz, 6dB per octave. Due to standing

waves at the crossover frequency, the low pass section may require adjustment

from as low as 9 Hz (12dB Bessel) to 15 Hz (15dB Butterworth). Typical

settings are in the middle of this range. Optimization of the low pass can be done

by ear (with music) or spectrum analysis.

With the crossover points set as listed above, the power requirements for

the bass and mid/treble amps are nearly the same. Therefore, use amplifiers of

similar power rating. It is suggested to use amplifiers rated at 1 watts RMS or

greater, into 8 ohms.

Some amplifiers invert is phased correctly between phase and this test

serves to double-check the entire system the bass and midrange.

12. SPEAKER PLACEMENT

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

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

Unfortunately, there is no definitive guideline which will cover all possible

listening rooms. Some experimentation is required for locating the optimum

position. The following are a few general guidelines:

TWEETER PLACEMENT

Room acoustics and your own personal tastes will determine whether to

position the panels with the tweeters on the inside or outside edge. In most

rooms placing them on the outside will give good dimensionality. Placing them

on the inside will, in most cases, increase the central focus and improve imaging.

For proper phasing between midrange and tweeter, the speakers should be toed

in slightly. Align the foot below the tweeter with the listening position as shown in

Figure 3.

BASS RESPONSE

lf you do not have access to a spectrum analyzer, play a record with a

repetitive bass line (preferably an acoustical bass instrument). Try the speakers

in several parts of the room. Start experimenting with the speakers about 3 feet

from the back wall. Try moving the speakers forward or backward by increments

of 6 to 12 inches at a time. One part of the room should be noticeably better than

the rest, as should one distance from the rear wall.

STEREO WIDTH AND IMAGING

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

for good bass performance, separate the tweeters by 5 % of the distance from

your chair to the speakers. (For example, if your chair is 1 feet from the

speakers, move the tweeters 5 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 getting a

''stage effect'' (or continuous image). If you have a hole-in-the-middle effect, your

speakers are too far apart: begin moving the speakers closer together in small

increments until you notice a point at which you achieve one cohesive ''sound

stage."

NOTE: Once you have located the ideal position you should mark it. A

small tack 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. 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.

13. ROOM ACOUSTICS

Magneplanars, like other bipolar speakers, usually sound best with a

moderately reflective surface behind the speakers. In situations where the

speakers must be placed closer than 2 feet from the back wall, a heavy damping

material directly behind the speakers is advised; however, it should not cover the

entire wall.

Damping material in other parts of the room is a matter of trial and error. 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 you make a permanent change to your room, experiment with the

positioning of the damping material. Usually a portion of one of two parallel walls

should have some damping.

An over damped room will provide very precise imaging, but you will have

a reduced sense of ambience (less reverberation, spaciousness). 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. Moderation

is the word.

14. OPTIONAL RIBBON TWEETER ATTENUATION

There are two principal reasons for needing to attenuate the Magneplanar

Ribbon Tweeter:

A) Recordings, typically in the ''pop'' or ''rock'' vein, often exhibit a

pronounced rise in the treble region.

B) The Magneplanar Ribbon Tweeter is very efficient in its total

''energy dispersion." If the surrounding walls are exceptionally

reflective, the overall perceived acoustical balance will be tipped

towards a ''hot'' high end.

Attenuation is performed through insertion of a simple non-inductive

resistor in series with the tweeter.

There are inputs provided on the connector plate of each speaker for

insertion of a resistor. To insert a resistor simply loosen the Allen screws,

remove the jumper, insert the resistor, and tighten the screws. A 1 ohm non-

inductive resistor will attenuate the tweeter approximately 2dB. Other values can

also be used and are available from your Magneplanar dealer.

15. MAINTENANCE

The wood trim can be cleaned and polished with a damp cloth. In the event the

speaker's fabric is damaged or soiled, replacement covers are available. DO

NOT VACUUM TWEETER CHANNEL!

16. SERVICE AND SHIPPING

In the unlikely event you should need service for your MG2 .1

loudspeakers, we recommend you return them through your dealer. He is

experienced in providing service and can assist you if the speakers must be

returned to the factory.

lf it is determined that your speakers must be returned for repair, ship

them (freight prepaid--ask for Rate Class 1 via truck) to: Magnepan,

Incorporated, 1645 Ninth St., White Bear Lake, MN 5511 . Include a packing

slip or letter describing the nature of the problem. Please include your name,

address, and a daytime telephone number.

Before packaging, very carefully install steel protector strips overdue

ribbon tweeters and remove the ribbon tweeters, following the removal

instructions on Page 4. Do not let the steel strips slap against the magnets.

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