Induction Dynamics ID1.15 - Manual (Page 9)

Subwoofer Design
Non-realistic, “boomy” bass frequencies are so prevalent in the home theater world that
some listeners have never heard a well-tuned subwoofer. The “boom” occurs because every
subwoofer has a natural resonance peak—that is, every subwoofer will naturally produce
a narrow range of low frequencies at a higher volume than the rest. This “boom” drowns
out higher frequencies your subwoofer produces, resulting in diminished performance and
muddy, poor-quality bass.
Induction Dynamics® engineers its subwoofers with high-performance drivers and specialized
filter circuits to eliminate resonance peaks and produce a fuller sound expressing all bass
frequencies.
Most subwoofers do not attempt to reproduce ultra-low frequencies because of the distortion
created by excess excursion. Induction Dynamics eliminates this distortion with a patented
frequency-selective excursion limiter. The excursion limiter allows the subwoofer to produce
ultra-low frequency sound but prevents the driver from overexerting and causing distortion
that could ruin your listening experience; the limiter itself is transparent, operating only at
specific frequencies without audibly switching on and off.
Dual Loudspeaker Switch
In order to provide greater flexibility and cater to listeners’ preferences, Induction Dynamics®
includes a unique switch on the ID1.15. This toggle switches the lower crossover in and out,
allowing users to operate their speakers as either a 3-way plus subwoofer (home theater) or
as a 4-way (stereo).
To listen to these speakers in stereo mode, powered by a single stereo amplifier, place the
switch in the 4-way position. In this mode, a passive crossover between the subwoofers and
the other drivers will be switched into the circuit, meaning all of the drivers in each speaker
are powered by one signal from each channel of a single stereo amp.
For home theater applications, flip the switch to the 3-way plus subwoofer position. In this
configuration, each channel powers the 3-way portion of your speakers (tweeter, mid-range,
and woofer) while the subwoofers are powered separately by the A2 subwoofer amplifier.
The home theater 3-way + option allows the speakers to serve in a modern audio/video
surround sound system with extended bass control and response capability.
For two-channel stereo (four-way) installation instructions, turn to page 8.
For multi-channel home theater (three-way plus subwoofer) installation instructions, turn to
page 9.
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