User manual MAGNEPAN MG20.1

[. . . ] DO NOT remove the protective strip from the ribbon until the MG20. 1 is fully assembled and the tweeters are installed. 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. [. . . ] Align the 4 gold connectors on the crossover to speaker inputs and place crossover on angle bracket. Connect the amplifier speaker cables to the input of the XO20. 1 Crossover box. Every connection point on the XO20. 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. They may be identical, or one set may be specialized for high frequencies and the other specialized for low frequencies. 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. BI-AMPLIFICATION The MG20. 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 200-300 Hz, 6dB per octave. Due to standing waves at the crossover frequency, the low pass section may require adjustment from as low as 90Hz (12dB Bessel) to 150Hz (15dB Butterworth). 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. 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. 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. 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. [. . . ] Other values can also be used and are available from your Magneplanar dealer. 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. SERVICE AND SHIPPING In the unlikely event you should need service for your MG20. 1 loudspeakers, we recommend you return them through your dealer. [. . . ]