MAGNEPLANAR® MG20.1 Instruction Manual White Bear Lake, Minnesota www.magnepan.
1. INTRODUCTION Congratulations on your purchase. The Magneplanar® MG20.1 loudspeaker was conceived and designed for perfectionists. One of the most revealing loudspeakers made, the MG20.1 will provide outstanding music reproduction when used With high quality components. 2. GENERAL DESCRIPTION Your Magneplanar MG20.1 speaker system consists of a pair of mirrorimaged, Fabric and wood trimmed panels, labeled "1'' and "2'' (for identification).
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.
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.
7. RIBBON TWEETER The foil element in your MG20.1 line source tweeter is only .00015" 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.
8. FUSING Your MG20.1'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.
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 XO20.1 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.
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 100 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.
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.
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.
17. TWEETER REPLACEMENT Because the foil element in your MG20.1 line source tweeter is only .00015 inches thick, it is very fragile. Some users will never require a replacement tweeter. Failure will generally occur from mishandling, or from improper fusing. Users who frequently push the 3 amp tweeter fuse capacity will be the most likely to experience early failure. The tweeter has been designed to be easily replaced, requiring only a screwdriver. The time required should be less than 30 minutes.
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