Wisdom Sage C150i, Owner'S Manual

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The excellent heat dissipation of these drivers makes them remarkably reliable. 
Planar magnetic speakers can handle a great deal of power without undue stress 
or audible strain. In fact, for a given size, they can handle many times the power 
of a traditional dynamic driver.

Easy on amplifiers

Because the conductor is essentially a long, thin wire, it presents a purely resis-
tive load to the amplifier. This is comparable to the simple test loads that ampli-
fier companies use when measuring their amplifiers to show how terrific they 
are. As such, you can be assured that your amplifiers will sound and work their 
best. 

Line source behavior

Almost all loudspeakers radiate sound into the room as imperfect “point 
sources.” This means that most of the energy they put into the room expands as 
an ever-enlarging sphere, as though emerging from a single point in space. This 
results in a multitude of reflections from the ceiling and floor that can degrade 
sound quality.

By contrast, the Sage C150i speakers radiate sound as a “line source.” The 
sound moves into the room as an expanding cylinder, rather than as an expand-
ing sphere — as though from a vertical line suspended in space.

Line source speakers provide two significant advantages: 

•  ceiling and floor reflections are minimized, resulting in greatly re-

duced interference, letting you hear more of the speaker and less 
of the room; 

•  the sound pressure level (SPL) throughout the room is much 

more evenly distributed, making it much easier to set the “right” 
volume, no matter where the audience is seated.