Overview: The THIEL CS2.4 floor-standing loudspeaker incorporates
several new innovative design techniques that greatly improve performance in a
three-way, floor-standing loudspeaker. The CS2.4 delivers a
much purer and more open upper and lower midrange response coupled with a sweeter and
smoother high frequency performance than conventional three-way loudspeakers.
The CS2.4 incorporates THIEL's latest innovative driver technology, rugged
cabinet construction, and phase/time correct Coherent Source design. All-metal
diaphragm, low-distortion drivers are used for outstanding tonal response and
the advanced phase correct crossover design greatly improves spatial fidelity
Warranty Information &
All-Metal Diaphragm Drivers: The CS2.4 is a three-way system
incorporating all THIEL-designed and built metal diaphragm drivers--a 1-inch
dome tweeter, 3.5-inch midrange driver, and 8-inch woofer--along with a 7.5 x
11-inch passive radiator. Metal diaphragms provide much higher stiffness which
eliminates diaphragm resonances in the operating range for very clear and open
reproduction. The CS2.4 drivers also use unusual short coil/long gap,
copper-stabilized motor systems to dramatically reduce distortion. Coupled with
the low resonance diaphragms and very high quality electrical network
components, a very high level of clarity and tonal accuracy is achieved.
- Coincident Driver Array Tweeter: The THIEL CS2.4's most
innovative design feature is a newly designed coincident tweeter/midrange driver where the two drivers' diaphragms
share the same voice coil. This technique allows for the elimination of the
midrange/tweeter section of the electrical crossover network as the drivers
incorporate a mechanical crossover. Along with eliminating the need for two
driver magnet structures, these reductions allow the CS2.4 to achieve a
level of sonic performance normally reserved for more expensive speakers.
The coincident array also uses very powerful neodymium magnets to improve
efficiency and a redesigned magnet venting system to reduce unwanted
- Metal Diaphragm, Low Distortion Woofer: The CS2.4's 8-inch woofer
uses a very low distortion short coil/long gap motor system, powered by a
2.5 pound magnet. The rigid aluminum diaphragm eliminates resonance
coloration, a special copper pole sleeve reduces inductance distortion, and
a heavy copper ring maintains an ultra-stable magnetic field.
- Passive Radiator: In combination with the 7.5 x 11-inch bass
radiator, the speaker produces exceptionally clean bass down to 33Hz.
Electrical Crossover: The
CS2.4 electrical crossover network provides completely phase accurate transitions between drivers to preserve the recording's spatial information. The network utilizes polypropylene and custom-made polystyrene capacitors, and low-oxygen copper, air-core inductors
for very low distortion.
Time and Phase Coherent: As with all THIEL loudspeakers, the CS2.4 is
completely time and phase coherent for much greater sonic realism. THIEL's
Coherent Source technology achieves the elimination of both time and phase
distortions that cause alterations in the reproduced musical waveforms of most
loudspeakers. Eliminating these distortions results in enhanced realism,
clarity, transparency and immediacy as well as improved imaging and soundstaging
in both the lateral and depth perspectives. Phase coherence in the CS2.4 is
achieved by utilizing a sophisticated first-order electrical crossover system in
conjunction with unusually wide bandwidth drivers. Time coherence is achieved by
placement of the drivers on a baffle that is sloped at the correct angle to
cause the sound energy from each to reach the listener at the same time.
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
CS2.4's are designed to be used with amplifiers rated up to 400 watts per
channel (into 4 ohms). The CS2.4 is of average efficiency (87dB) and therefore
requires an average amount of power from a quality amplifier.
Cabinet Construction: The CS2.4 cabinet is built with a
3-inch thick front baffle, 1-inch thick cabinet walls, and internal bracing for extreme rigidity to reduce unwanted vibration,
improving clarity and spatial performance. The baffle's rounded edges reduce
diffraction effects for improved tonal, spatial, and transient performance, and
its sloped front correctly time aligns the tweeter with the woofer The CS2.4 is
available in a wide variety of exquisite, real-wood, laminate, and painted
cabinet finishes, finely crafted to enhance any home environment including
Amberwood, Black Ash and Natural Cherry.
Note: THIEL CS2.4 cabinets possess a high quality lacquer finish
that is both beautiful and very durable. Any furniture care product such as
Pledge, Johnson's, or Endust can be used to keep the cabinets clean.
Magnetic Grille: The CS2.4 grille is attached magnetically to the
front of the speaker. The grille is designed to not produce diffraction so there
is no sonic reason to remove it. If you do need to remove the grille, carefully
pull the grille frame away from the front of the speaker. When replacing the
grille, line up the grille with the baffle's inlay edges.
Note: The grilles can be cleaned of dust by using an upholstery
attachment of a vacuum cleaner. To prevent damage to the tweeter, take care
not to push the cloth in toward the top of the grille
Binding Posts: The CS2.4's input terminals are located on the lower rear
of the speaker cabinet. The CS2.4 uses binding posts that accept several
types of wire connections (will not accept dual banana plug connectors but
single banana plugs can be used). The input terminals are designed to be easily
tightened by hand or a 1⁄2 inch nut driver can be used. The speaker's input
terminals are color coded to facilitate that both speakers in a stereo system
are wired in the same polarity for maximum speaker performance. The speakers
should be connected to the amplifier with high quality cable to ensure minimal
loss of power and proper control by the amplifier.
Note: The CS2.4 is a very high quality sound reproducer and will
benefit from use with the best 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
Placement: The CS2.4s are relatively non-critical to room placement
and will provide good results from almost anywhere. However, here are some
guidelines to help you achieve the best sound from your speakers. Speaker
placement will affect the accuracy of timbre, spatial performance, and bass
- Distance From Walls: THIEL speakers, and most others, sound best
if they are placed well away from all walls. Such placement optimizes
imaging and depth, and musical timbres are reproduced with the least
coloration because it allows the initial sound coming from the speaker to be
distinctly separated in time from the secondary sound of wall reflections.
If reflections are heard too quickly after the primary sound, your brain
tends to interpret them as part of the initial sound, causing the perceived
timbre to be altered and the spatial characteristics to be confused. If you
experiment, you will notice a major improvement in openness when the
speakers are even two feet from the rear wall instead of one. Ideally, the
speakers should be three feet from the rear wall and five feet from the side
wall. Also, it is not desirable for large objects to be placed near the
speakers since these will also be a source of unwanted early reflections
that reduce imaging accuracy.
- Spacing: Because of their very wide, even dispersion of energy,
THIEL speakers should usually be placed farther apart than most. Optimum
imaging is usually achieved when the speakers and the listener form an
equilateral triangle, although this will depend on the width of the room (a
narrow room will require closer placement). If the speakers are too far
apart for a given environment, there will tend to be a "hole" in the middle
of the sound stage; if they are too close together, the image will be
compressed and will not achieve optimum width.
- Aiming: Preferred the imaging is obtained when the speakers are
pointed straight ahead rather than pointing toward the listener. This
placement produces the largest, most natural soundstage. However, toeing the
speakers in somewhat may produce more specific placements of instruments.
Also, if it is not possible to get the speakers far enough away from the
side walls, a toed-in position can be helpful to reduce the strength of wall
- Bass: Bass response is also affected by speaker placement. In
general, when a speaker is close to a wall the bass response is stronger and
placing a speaker in a corner will make it even more so. In order to achieve
properly balanced bass, it is necessary for the speaker to be used in the
environment for which it was designed. THIEL speakers are designed to
provide accurate bass when positioned away from all walls-the same position
that provides the best imaging.
- Listener Position: The CS2.4s provide broad dispersion of energy
at all frequencies and therefore provide good results throughout a large
listening area. Best imaging is provided for a listener centered in front of
the speakers. Optimum phase and time alignment is provided only for a seated
listener who is eight or more feet away from the speaker.
Stabilizer Feet: Speakers positioned on a soft or uneven surface are
able to rock slightly and will vibrate in reaction to forces the speaker
generates to move the driver diaphragms. This motion slightly reduces the
music's clarity. To eliminate this effect, the CS2.4s can be used with the
supplied four gold stabilizer feet on uneven surfaces or on carpeted floors to
provide a more solid footing and allow the speaker to couple more firmly to the
floor. The speakers should be positioned before the stabilizer feet are
Note: Please be cautioned that the stabilizer feet can dent
hardwood floors and it is possible to mar the floor's surface if the
speakers are moved with the feet in place.
Information & Break-in Period
Break-In Period: The CS2.4's, like most speakers, require a period of
playing before they perform optimally. The amount of 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. You should notice even more improvement
after 100 hours
10 Year Warranty: THIEL warrants every THIEL model CS2.4 loudspeaker
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.