[h=1]Crystal oscillator[/h] From Wikipedia, the free encyclopedia
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A miniature 16
MHz quartz crystal enclosed in a
hermetically sealed HC-49/S package, used as the resonator in a crystal oscillator.
Quartz crystal resonator (left) and quartz crystal oscillator (right)
A
crystal oscillator is an
electronic oscillator circuit that uses the mechanical
resonance of a vibrating
crystal of
piezoelectric material to create an electrical signal with a very precise
frequency.[SUP]
[1][/SUP][SUP]
[2][/SUP][SUP]
[3][/SUP] This frequency is commonly used to keep track of time (as in
quartz wristwatches), to provide a stable
clock signal for
digital integrated circuits, and to stabilize frequencies for
radio transmitters and
receivers. The most common type of piezoelectric resonator used is the
quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators,[SUP]
[1][/SUP] but other piezoelectric materials including polycrystalline ceramics are used in similar circuits.
Quartz crystals are manufactured for frequencies from a few tens of
kilohertz to tens of megahertz. More than two billion crystals are manufactured annually. Most are used for consumer devices such as
wristwatches,
clocks,
radios,
computers, and
cellphones. Quartz crystals are also found inside test and measurement equipment, such as counters,
signal generators, and
oscilloscopes.
So you may still ask, what effect? Hmmm. Dunno, but light spectrums have various frequencies which MIGHT be tunable for max benefit.
I have been involved n hi-end audio for 40+ years!, some speaker manufacturers make passive subwoofers (sans amplification). Doesn't seem lioke they would work, but they do add a warmth 
Thanks bruv!
