Magnepan DWM - Manual (Page 6)

7. Bass Attenuation
If it is necessary to reduce the output of the DWM, remove the Bass Attenuator
jumper and insert a 25 watt (or higher wattage) resistor. Typically, 1-4 ohms is
sufficient for most installations where bass reduction is needed. If a large
amplifier and/or high power bass levels are used, four 2 ohm, 25 watt resistors
can be used in a series/parallel combination that will provide a 100 watt rating
at 2 ohms. Caution--Depending upon how loud the system is played, the
resistor could become hot and cause a painful burn.
8. Midbass Attenuation
In the event there is too much lower midrange/upper midbass from the DWM
Bass Panel, a 1.4 mh iron-core inductor may be installed in the Attenuator
terminals for a faster roll-off rate. Use an inductor with low resistance to
maintain maximum output of the lowest frequencies.
9. Better bass for full-range Maggies
Put a big speaker in a small room, too much bass. Put a small speaker in big
room, too little bass. Everyone knows that. In general, it is true. There is no
one-size-fits-all.
Most of the area of any full-range Maggie is devoted to bass reproduction. (In
the case of the 20.7, 76% of the total radiating area is devoted to bass.) The
Magneplanar Bass Panel offers you the flexibility to add bass diaphragm area
to fit the needs of your room. Due to standing waves, dips and peaks in the
bass and midbass are a fact of life. Each room has its sonic signature
depending upon the size, shape and construction. Some sound rooms are
“hostile” to dipoles and it is difficult to generate bass or midbass. From the
$600 pair MMG to the 20.7, the Maggie Bass Panel can get the bass/midbass
“just right.”
The DWM should be equi-distance from the listener (but, 12 inches closer to
the listener) for floor-standing models to achieve proper phase. Imagine
stretching a string from your listening seat to your full-range Maggies (but, 12
inches shorter), drawing an arch on the floor would be the possible positions
Page of 6 8 Revision-- 10-3-12