THIEL
Model CS1.5
Coherent
®
Source
loudspeaker
system
OWNER INFORMATION
G
-
®
1997
CONSUMER ELECTRONICS SHOW
Speaker of the Year
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CONNECTING THE SPEAKERS
The CS1.5’s input terminals are located on the back of the speaker at the base. For proper performance, it is essential 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 input terminal of each speaker should connect to the respective positive output terminals of the
amplifier; the wire connected to the black input terminal of each speaker should be connected to the respective negative
output terminals of the amplifier. Make sure that all connections are tight.
The speakers should be connected to the amplifier with high quality cable to insure 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 probably give the best results.
If the amplifier has a speaker fuse or if a fuse is used in line to the speakers, we recommend a value of 2 amps of the normal
blow type (type 3AG-2 amp). Although fuses offer some protection, they do not necessarily protect the speaker against all
types of overload and also introduce audible degradation of the signal.
Due to European CE regulations that do not permit banana plug type loudspeaker connections, we ship THIEL speakers
with removable plugs installed in the ends of the binding posts. If you wish to use banana plug type connections, you may
remove the plastic plug inserted into the end of each plastic binding post cap. To remove the plugs, completely remove the
two post caps by turning them counter-clockwise with a 1⁄2-inch nut driver or wrench until the caps come off the threaded
post. Using a small screwdriver or similar tool, push the plug out from the bottom of the cap. Reinstall the plastic caps on the
threaded posts. (Note: You may wish to modify the plastic binding posts caps one at a time to insure that the properly colored
cap is reinstalled on the correct post.)
STABILIZER PINS
Speakers positioned on a soft surface such as carpeting are able to rock back and forth slightly and will vibrate in reaction to
those forces the speaker generates to move the driver diaphragms. (Every action has an equal and opposite reaction.) This
motion of the speaker causes a loss of musical information and reduces the clarity of the music.
In order to eliminate this effect, the THIEL CS1.5 can be used with the provided stabilizer pins. The stabilizer pins are
pushed into three sockets in the base of each speaker. The pin point penetrates the carpet and allows the speaker to rest firmly
on the floor. The three pins provide a stable foundation which eliminates some obscuring of information and produces a
cleaner, more articulate sound. No pins are required when placing the speakers on hard or smooth surfaces.
There are some applications where the stabilizer pins will not bring an improvement in sound but may actually make it
worse. This situation occurs when the floor itself is not rigid and therefore vibrates when connected to the speakers via the
stabilizer pins. We encourage you to experiment to determine for yourself whether or not this is the case.
To insert the pins, tilt the speaker forward and push the two back pins fully into the 1" deep holes located in each back
corner of the base. Then rock the speaker backward and insert the front pin. Finally, press firmly on the top of the speaker
with a slight rocking motion until the pins penetrate the carpet completely. To check that the pins are firmly seated, lightly
tap the back and side of the speaker. There should be no movement and the speaker should feel solidly in place.
If the speaker is moved with the pins in place, care should be taken to lift the speaker straight upward until all the pins have
cleared the carpet. Also, tilting the speaker so its weight is resting on any single pin can damage the speaker’s wood base.
Please be cautioned that the pointed pins can be dangerous if not used with care. They can cause small dents in hardwood
floors and it is possible to damage carpets if the speakers are moved incorrectly with the pins in place.
ASSOCIATED EQUIPMENT
The CS1.5 is a very high quality sound reproducer and will benefit from use with very good 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. Also, the quality of the interconnect cables and
speaker cables will significantly effect the performance of the system.
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POWER REQUIREMENTS
It is important to have enough power to play at the level you desire without distortion. If high sound levels are desired, the
CS1.5s are designed to be used with amplifiers rated up to 150 watts per channel. If you play the speakers more loudly than
the volume the amplifier can cleanly produce, the amplifier will produce overload (clipping) distortion. The sound will
become compressed, strained, and in extreme cases, obviously distorted. This distortion is actually non-musical additional
energy that can damage speakers in extreme cases.
Keep in mind that sound quality is usually much more important than sound quantity. There can be large differences in the
sonic performance of two amplifiers of equal power, and this is more important than large differences in power. Most
everyone will be happier with a 50 watt amplifier of high sonic quality than with a 100 watt amplifier of mediocre sonic
quality. For this reason, we feel there is no substitute for listening to make your amplifier decision.
The question “how much power do I need?” does not have the simple answer most people expect because it is not
determined only by the loudspeaker’s efficiency, but also by the volume desired and the size of the room. If all three factors
are average, about 50 watts per channel is required. Each factor can raise or lower this amount by about three times.
1) Usually, people who “don’t like music loud” can decrease their power to about one-half. Also, people who like music
loud should increase their power by 2 times or more. Most people fall within a normal range.
2) A speaker with a low efficiency of 84dB/W-m will require twice the power of an average 87dB/W-m speaker and one
with a high rating of 90dB/W-m will require only half the power of an average speaker. Usually, high efficiency can be
obtained only by trading off sonic quality—there are very few speakers that provide a very high level of both. The CS1.5 is
of average efficiency (87dB) and therefore requires a normal amount of power.
3) A small room will need less power for a given loudness level than a large room. A very small room of 1000 cu ft (11' x
11' with an 8' ceiling) will require about half the power of an average size room. A large room of 6000 cu ft (20' x 30' with a
10' ceiling) will require twice the average power. If the listening room is connected to another room by a large open area, the
required power will increase, but not by the amount of the combined room volume. If the room has a “dropped” ceiling with
light panels, the ceiling will be almost transparent acoustically and the space above the ceiling should be added. If the panels
are heavy they will act more like a normal ceiling.
With all this in mind, a person who doesn’t like to play music very loudly and has a small room can get high quality sound
with as little as 20 watts whereas a person who sometimes likes to play loudly and has a large room may need 150 watts.
GRILLE
The grille on the CS1.5 is designed as an integral part of the system to reduce unwanted diffraction effects. Therefore, it must
remain in place for proper operation. If you do need to remove the grille, pull the bottom of the grille frame away from the
speaker an inch or so and then pull the top of the grille forward to remove it.
The grilles can be cleaned of dust by using an upholstery attachment of a vacuum cleaner.
CABINET FINISH CARE
THIEL wood cabinets possess a high quality lacquer finish that is both beautiful and durable. However, any wood finish can
be damaged by excessive moisture, dryness, or direct sunlight. When cleaning your speakers, avoid using oils, waxes, or
polishes that contain silicone, such as Pledge or Johnson’s. We recommend using Endust. Non-wood laminate cabinets may
be cleaned with a glass-type cleaner and a soft cloth.
SERVICE
If your system requires service, contact your authorized THIEL dealer. If you need to contact THIEL, service information
and technical support is available at (606) 254-9427, Monday-Friday, 8:30 a.m. - 5:00 p.m. Eastern Time, or via e-mail at
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CS1.5 SPECIFICATIONS
Bandwidth (–3dB)
42 Hz-22 kHz
42 Hz-22 kHz ±3 dB
Minimum ±10°
Amplitude Response
Phase Response
Sensitivity
86 [email protected] V-1m
4 ohms (3 ohms minimum)
50-150 watts
Impedance
Recommended Power
Size
8.5" W x 11" D x 33" H
42 pounds
Weight
We Want You Listening For A Lifetime
Used wisely, your new sound equipment will provide a lifetime of enjoyment. Since hearing damage from loud noise is
often undetectable until it is too late, THIEL and the Electronics Industries Association’s Consumer Electronics Group
recommend you avoid prolonged exposure to excessive noise. Depending on room size and amplifier power, some home
audio systems can reach sound pressure levels in excess of 95 decibels with peaks of over a 105 decibels. For your protection,
the list below identifies sound levels for various noises.
The Following Noises Can Be Dangerous Under
Constant Exposure
Decibel
Level Example
30
40
50
60
70
80
Quiet library, soft whispers
90
100
120
140
150
Subway, motorcycle, truck traffic, lawn mower
Garbage truck, chain saw, pneumatic drill
Rock concert in front of speakers, thunderclap
Gunshot blast, jet plane
Living room, refrigerator, bedroom away from traffic
Light traffic, normal conversation, quiet office
Air conditioner at 20 feet, sewing machine
Vacuum cleaner, hair dryer, noisy restaurant
Average city traffic, garbage disposals, alarm clock at
two feet
Rocket launching pad
We
Want You
Information courtesy of the Deafness
Research Foundation and the EIA.
LISTENING
For A Lifetime
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LIMITED WARRANTY
THIEL warrants every THIEL model CS1.5 system against defects in materials and workmanship to the original owner
for a period of ten years from the date of purchase. THIEL will, at no charge, replace any defective part and make any repairs
necessary to ensure its proper performance when the defective unit is returned to us postpaid.
This warranty does not cover damage due to accident or abuse and is void if the unit has been tampered with.
This warranty is automatic and no registration is required. This warranty gives you specific legal rights. You may also
have other rights which are particular to your state.
The following information is for your records.
Serial Numbers______________________________
Purchase Date_______________________________
Purchased From_____________________________
CONTRIBUTOR
HARDWOOD
FORESTRY FUND
THIEL
1026 Nandino Boulevard
Lexington, Kentucky 40511-1207
8/98
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