User manual MAGNEPAN DWM WOOFER

[. . . ] Introduction/General Description Carton Contents Packaging Installation and Hookup Placement Phasing Bass Attenuation Service and Shipping Specifications Introduction/General Description The Magneplanar DWM is a dipole, thin-film planar/magnetic woofer which is a derivative of the MG 20. 1 DiPlanar woofer technology. The DWM can be driven simultaneously by 2 separate amplifiers (typically the front left and right channels). A built-in crossover provides a high-pass output for use with "small" Magneplanars. 2. Carton Contents 1 - DWM Loudspeaker with base 1 - Magnepan "Shaped" Pink Noise CD Test Disk 1 - Hex Wrench 2- 2 ohm, 25 watt resistors 1 - Speaker Logo 1 - Owner's Manual 3. Packaging Save all packaging. [. . . ] The DWM can seamlessly cross over at a higher frequency to any of the limited bandwidth "Maggie" models. However, the higher crossover points require proper time alignment to achieve the most seamless blend between the DWM and the limited bandwidth Magneplanar. Therefore, the DWM should be equi-distance from the listener to the limited bandwidth Magneplanar. Minor adjustments from that position are often necessary for "fine tuning" as described under "Phasing" below. The DWM should be oriented so it is perpendicular to the side wall and playing down the length of the room as shown in Fig. The DWM will give the lowest frequency response if a boundary is used to reduce dipole cancellation of bass frequencies. A placement along a wall or next to a cabinet or piece of furniture will reduce dipole cancellation. Fig. 1 6. Phasing The Magnepan Pink Noise CD Test Disk included with your DWM can be used to determine if the DWM is in ACOUSTICAL phase with your limited bandwidth Magneplanar. The test CD has a 9 db peak at 80-100 Hz that draws attention to the frequencies which will be depressed in an out-of-phase condition. Place the DWM next to your limited bandwidth Magneplanar and change the phase. (It is much easier to detect an out-of-phase condition when the "small" speaker is physically next to the woofer. ) Since the DWM is a dipole woofer, the easiest way to determine if the DWM is in-phase is by simply turning the woofer around (180 degrees). If you are uncertain if the acoustical phase is correct, a technique which can help is by leaning over and positioning your head between the Magneplanar Woofer and the "small" Magneplanar as shown in Fig. High frequencies will appear to be up and low frequencies will appear to be down. Midbass frequencies, if in phase, will appear to be in the middle (and louder). Depending upon the location of the DWM with respect to the limited bandwidth Magneplanar, the DWM might be 90 degrees out of phase with the "small" Magneplanar and changing the phase does not make a noticeable difference in the loudness of the pink noise peak. It may be necessary to move the DWM with respect to the Magneplanar to achieve a better acoustical in-phase condition. Fig. [. . . ] Please include your name, address, and a daytime telephone number. 9. Specifications System Description: Planar-magnetic dipole woofer. on web site www. magnepan. com Sensitivity: 86 dB @2. 83V/1 Meter/50 Hz Impedance: 4 Ohms Dimensions: 19. 25Hx22. 5Wx1. 25D (inches) Warranty: Limited 3-year to original owner Weight: 19 lbs. *Bass response will vary depending upon placement near walls, cabinet or furniture. [. . . ]