Magnepan MG 20.7 User Manual

Magneplanar 20.7 Instruction Manual

Quick Step-Up Instructions

The 20.7 has exceptional phase characteristics that are accomplished without the use of compensation networks. To
realize the optimum phasing, the 20.7 should be angled inward as shown in the diagrams below. (Do not place parallel to
the front wall.) 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 off to one side, tweeters on the outside
will keep the image centered for those listening off-axis.

Your 20. 7s have been shi pped wi th the tweeter jumpers removed.

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 resistor for the tweeter. Rooms that are large and/or overly-damped may require
the enclosed jumper for smooth response.

Especially, during the break-in period, experiment with the 1 ohm resistors on the midrange. The addition of the midrange
resistor will p rovide a "warmer" balance.

TABLE OF CONTENTS

1. Introduction

2. General Description

3. Carton Contents

4. Packaging

5. Assembly

6. Tweeter Installation

7. Hookup

8. Caution

9. Speaker Placement

10. Bass Response

11. Stereo Width and Imaging

12. Left/Right

13. Phasing

14. Room Acoustics

15. Optional Tweeter Attenuation

16. Maintenance

17. Specifications

1. Introduction

Congratulations on your purchase. The Magneplanar 20.7 loudspeaker was conceived and designed by
perfectionists, for perfectionists. Due to the elegant simplicity and ruggedness of the design, the Magneplanar 20.7
loudspeaker will give many years of trouble-free service.

2. General Description

The 20.7 is a 3-way, full-range ribb on design with a quasi-ribbon bass and quasi-ribbon midrange, and true-ribb on
tweeter.

3. Carton Contents

1 pair 20.7 loudsp eakers
2 each ribbon tweeters with screws
4 each feet
4 each handles
8 each foot bolts
4 each wooden handles
4 each 1 ohm resistors
2 each 5 amp fast-blow fuses
2 each 2 1/2 amp fast-blow fuses
4 each tweeter end covers
2 each jumpers
2 each Magneplanar logos
1 each ball point Hex driver

4. Packaging

Save all packaging. If you need to transp ort 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.

5. Assembly

A. Remove speakers and feet from carton.
B. We suggest the assistance of a second person will facilitate the installation of the feet. Place the speaker on

its side edge.

C. Note that one end of the foot is longer than the other end. Place the longer end toward the front of the speaker.

Carefully align the foot on the backside of the panel so the holes in the foot line up with the bolts in the panel.
Using your fingers, insert a bolt through the center hole until the bolt engages with the nut in the panel. Do
not use a screwdriver until the bolt has engaged the threads. Care must be taken to avoid cross-threading
the bolts.

D. Repeat the same procedure for top hole.

E. Tighten all the bolts securely.
F. Four handles can be installed on the back of the speakers to facilitate moving the speakers. The holes on

the speaker p anel are located 26 inches from the bottom.

6. Tweeter Installation

A. Install the tweeter with the serial number at the bottom.
B. The panel has been pre-drilled for the tweeter screws. Align the tweeter slots with the panel holes. This may

be more convenient if the speaker is laying on a table.

C. Attach the connectors at both ends of the tweeter and remove the protective strip. Install tweeter end covers

over the terminals.

D. Note-- The tweeter ribbon is fragile. Tweeter protector strips should always be installed to p rotect against any

situation that would cause a change in air p ressure such as shipping. Do not vacuum the front grille.

7. Hookup

The features unique, high current connectors which provide optimum contact area with the speaker cables up to 10
gauge (or for banana connectors). 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 incomp atible with
the Magneplanar high current connector.