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TD-000487-00
K Series Service Manual
4. Operational description
4.1 Series description
Converging our expertise in loudspeaker, amplifier, and digital signal processing technologies, QSC has created a spectrum
of active loudspeakers designed with one common goal - accurate acoustical performance for the widest selection of appli-
cations. Ranging from a compact and potent eight-inch, two-way utility loudspeaker to a fixed-accurate line array system, all
K Family models feature common power modules, DSP and performance characteristics - irrespective of their size or config-
uration. Models are differentiated primarily by coverage angle, bass extension, woofer diameter and enclosure size. With the
K Family there is no “good, better, best” - only “best, best, best”.
4.2 Top-Box Models
The K8, K10, and K12 loudspeakers are all top-box style loudspeakers. The enclosure is constructed of ABS plastic and are
painted over with QSC black RAL 9011. The front grille, which displays the QSC logo, is 16 gauge steel and finished with a
black powder coat. Behind the grille is the main baffle of the speaker. The baffle incorporates a wave guide that determines
the coverage angle of the speaker. Attached to the baffle are two transducers — the low and high frequency. Each model
has a different size low frequency transducer - the K8 has a 8”, K10 has 10”, and K12 has a 12”, all extending bass response
as diameter increases. Top-box models share the same high frequency transducer, which has a 1.75” diameter voice coil
with a neodymium magnet to decrease overall size of the transducer. The transducers are powered by a two channel class
D amplifier module which is fastened to the rear of the ABS enclosure. The amplifier module is bi-amped. The low channel
is connected to the low frequency transducer and is dedicated to frequencies below 2 kHz and the high channel is connect-
ed to the high frequency transducer and is dedicated to frequencies above 2 kHz.
Top-box models are effective as mains or monitors. The K10 and K12 have rubber feet on the side so they can be placed
sideways in the monitor wedge position. All models share the same handles and hardware. The pole-cup assembly is
different on each model but share the same characteristics. The speakers can be placed on a speaker stand at a 0 or 7.5
degree downward angle. Three mounting points are available for vertical suspension with QSC’s M10 Kit-C. There are two
M10 mounting points on the top and one on the lower-back. If horizontal suspension is preferred, a yoke mount kit must
be used.
Summary of Contents for K8
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