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ongratulations on your purchase of the THIEL HigherPlane 1.2 in-ceiling loudspeaker. This product
is the result of a dedicated effort to provide very accurate and realistic sound reproduction from a
versatile, easy-to-place loudspeaker. We have used very high quality components and taken great care in
the HigherPlane 1.2’s construction. Properly installed and used with good associated equipment, the
HigherPlane will provide you with a great deal of sonic enjoyment for many years.
Jim Thiel, Product Designer, THIEL Audio
SPEAKER PLACEMENT
The HigherPlane 1.2 is designed for in-ceiling placement. Because of its wide dispersion and coaxial/coplanar driver
mounting, the HigherPlane 1.2 offers excellent results for a variety of ceiling locations and listener positions. For optimum
performance, the HigherPlane should not be placed within two feet of the room’s walls.
CONNECTING THE SPEAKERS
The HigherPlane 1.2’s input terminals are located on the bottom of the speaker cabinet. The HigherPlane 1.2 uses 5-way
binding posts that accept several types of wire connections. Make sure that all connections are tight. The input terminals are
designed to be easily tightened by hand or a
1
⁄2 inch nut driver can be used.
It is essential for proper performance that both speakers in a stereo system be wired in the same polarity. The speaker’s input
terminals are color coded to facilitate this. The wire connected to the red ringed input terminal of each speaker should connect
to the respective positive (+) output terminals of the amplifier; the wire connected to the black ringed input terminals should be
connected to the respective negative (–) output terminals of the amplifier.
The speakers should be connected to the amplifier with high quality cable to ensure minimal loss of power and proper control
by the amplifier. If the speakers are being connected to a vacuum tube amplifier with various impedance taps, the 4 ohm tap will
usually give the best results.
ASSOCIATED EQUIPMENT
The HigherPlane 1.2 is a very high quality sound reproducer and will benefit from use with high quality associated
equipment. Since it is extremely accurate, it will reveal sources of distortion generated elsewhere in the system. For example,
distortion resulting from poor recordings or inferior electronics will be reproduced accurately.
BREAK-IN
The HigherPlane 1.2, like most speakers, requires a period of playing before they perform optimally. The time depends on
how loudly the speakers are played; more time is required if played softly, less if played loudly. At least 50 hours at
moderately loud levels are required before the speaker is performing near optimum.