Thiel Coherent Source CS3.7 Abmessungen

Cabinet

The cabinet plays an enormously important role in the quality

of music reproduction, and so the engineering of the CS3.7’s

cabinet incorporates several innovations that contribute to

the speaker’s stunning clarity, its utter tonal neutrality and its

exceptionally realistic imaging.

The cabinet’s most important function is to completely contain

the energy generated by the drivers to the inside of the cabinet.

If even a miniscule amount of this internal energy escapes

through vibration of the cabinet walls, distorted sound will be

generated that will obscure the music’s delicate details. Cabinet

wall motions of even one ten-thousanths of an inch or less will

produce audible distortion, and so it is very important that all

cabinet walls are as strong and rigid as possible. In this regard

the CS3.7 performs extraordinarily well, with all the cabinet

elements innovatively engineered to provide exceptional

rigidity.

Another task the cabinet must perform is to allow the sound from

the drivers to radiate freely without encountering cabinet edges or

cavities that will diffract some of the energy, causing interference and delayed sounds that produce tonal colorations and obscure

spatial information. In this regard, the CS3.7 provides exceptional results with its gently rounded cabinet top and sides.

Yet another cabinet function is to position all the drivers properly so that the listener hears the sound of each driver at the same

time. The CS3.7’s sloping front is designed to achieve time coherence between the sonic output of the woofer and the midrange/

tweeter array.

And nally, the cabinet should avoid cavity resonances and standing waves in its internal spaces. Here also, the CS3.7 performs

well, with the curvature of its sides and top, along with its angled bafe, presenting virtually no parallel walls.

The speaker’s front bafe is

machined from aluminum, a

material more than 30 times

as strong as the usual MDF. In

addition to reducing unwanted

vibrations, aluminum also

provides a rigid mounting of

the drivers so they cannot move,

even a miniscule amount, in recoil

from the forces they generate to

accelerate the diaphragm (every

force has an equal and opposite

force).

The bafe’s sloping angle positions

the drivers for proper time

coherence. The construction of the cabinet sides also plays its

part in the CS3.7’s rigid, low vibration cabinet.

The sides are made of 15 layers of hardwood

laminated together into a curved shape

under high pressure. This

results in a much stronger

panel than usual, with the

curves adding greatly to

its rigidity. The rounding

at the front of the

speaker also reduces

unwanted diffraction,

and the gentle rounding along the cabinet sides creates

non-parallel walls

to minimize internal resonances.

The cabinet top is made of

die-cast aluminum whose

shape provides several

important advantages.

First, it provides

enormous strength,

virtually eliminating unwanted

vibration. Also, its rounded

shape around the midrange eliminates diffraction of

energy from the midrange and tweeter. In addition, the

rounded shape helps minimize resonances within the

cabinet.

www.thielaudio.com

“The world should experience the performance of this exceptional loudspeaker.”

—Matthias Böde, STEREO Magazine, January 2008

Reducing Diffraction

This diagram illustrates how

energy from the tweeter (blue) is

diffracted from cabinet edges and

a nearby driver cavity (red).

Here it is illustrated how the

CS3.7’s rounded bafe edges and

at midrange diaphragm allow

the tweeter’s energy to leave the

cabinet without being diffracted.

The THIEL CS3.7

“In a word: stunning.”—Brett Gideon,

TONE Magazine, New Zealand, January 2008

The cabinet top is made of die cast aluminum into a shape that provides

dramatically improved vibration reduction, the practical elimination of

diffracted driver energy and the reduction of internal standing waves. Less

vibration contributes to greater clarity, while the absence of diffraction allows

for very open, boxless reproduction.

The tweeter is coincidently mounted with the midrange so the two drivers

are perfectly time coherent for every listener position and so every trace of

lobing is vanquished. This driver mounting system ensures that you will always

hear the sound with perfect timing and synchrony, creating a sense of realism

unachievable by any other means.

The midrange driver incorporates a radically new diaphragm geometry that

provides incredible rigidity and achieves perfect pistonic motion to the limits

of audibility. The diaphragm’s at shape also eliminates any altering diffraction

of the tweeter’s output.

The cabinet sides achieve great stiffness by a construction of 15 hardwood

plies formed together into a curved, thick panel. This construction preserves

the nuances and delicacy of the music by reducing unwanted sonic artifacts

that would obscure musical detail.

The cabinet front is sloped to provide time coherence between the woofer

and the mid/tweeter array, preserving music’s timing information. Because all

the discrete harmonics that make up the musical sounds are heard in perfect

synchrony, all the music’s spatial cues are reproduced naturally.

The 3.7’s front bafe is machined from aluminum to provide great rigidity

against unwanted vibration and to provide a very hard and rigid mounting for

the drivers, practically eliminating recoil motions of the drivers. Such a rigid

mounting system retains delicate information lost in most speakers.

The woofer’s diaphragm contributes to extended bandwidth and high

while its very large magnet powers the copper stabilized, long gap motor

that achieves distortion levels only one-tenth the usual. The result is tonal,

effortless, and solid low frequencies.

The sophisticated crossover network provides complete phase coherence of

the musical harmonics so that the music’s waveforms are preserved, while also

providing uniform energy response and exceptionally neutral tonal response.

The result is astonishing clarity, transparency, and true three-dimensional

realism you may not have known was possible.

The Midrange Driver should, of course,

precisely reproduce every musical nuance while introducing

not even a trace of its own colorations or distortions

caused by diaphragm resonances or electromagnetic

nonlinearity. The most exciting innovation in the CS3.7

is a new midrange diaphragm that advances midrange

performance much closer to this ideal.

The midrange driver’s diaphragm is constructed with

an entirely new shape that provides far greater stiffness

than typical diaphragms, even those made from exotic

materials. The diaphragm is shaped with corrugations that

are oriented from the center outward (like spokes) and

act a little like small I-beams to provide enormous strength

in that direction. The large diameter voice coil attached to

the diaphragm gives it strength in the other direction – around

the circle. This design achieves such great stiffness that the diaphragm

continues to vibrate perfectly, as one unit, all the way up to 20 kHz, usually

considered the upper limit of human hearing. Such fabulous vibrational behavior is

unprecedented and allows the CS3.7 to achieve a purity and delicacy of the high frequencies that is truly extraordinary.

This new diaphragm geometry also has a second important benet that derives from its shape. The diaphragm is basically at and

therefore has virtually no detrimental effect on the tweeter’s output, unlike a normal cone shaped diaphragm that alters the sound

of a tweeter mounted in its center.

Anatomy of a midrange driver

The Tweeter provides much lower distortion

and higher output than any other tweeter we are aware

of. This is accomplished in spite of a size small enough to

mount coincidently with the midrange driver by a unique

long gap motor system that uses a set of four radial and one

axial neodymium magnets with a total weight six times that

of a typical neodymium powered tweeter. In addition, the

tweeter provides the complete absence of any coloration-

producing diaphragm resonances in the audible range,

a very wide operating bandwidth and very low power

compression. The result is high frequencies of utter neutrality

and effortless dynamics.

A set of four radially-magnetized and one axially-magnetized

neodymium magnets have a total weight of 2.3 oz. (64 grams),

six times as much as usual neodymium powered tweeters.

3.7

Components

The die-cast chassis

rigidly holds the tweeter

and midrange in perfect

alignment and virtually

eliminates transient-

robbing subtle vibrations

of the motor system.

A copper sleeve around

the center magnetic pole

stabilizes the strength of

the magnetic eld and

reduces the voice coil’s

inductance non-linearity.

An extremely powerful

neodymium magnet

powers a very large and

deep magnetic gap so

the driver can achieve

both very high efciency

and high level, low

distortion output.

The wide magnetic gap,

in conjunction with the

short-winding voice

coil provides much

lower motor distortion

compared with common

short-gap designs.

The very large

diameter voice coil

contributes exceptional

circumferential strength to

the moving system while

providing high power

handling and very low

power compression.

The unique diaphragm

shape provides

unprecedented

stiffness and therefore

unprecedented,

resonance-free operation.

www.thielaudio.com

The Crossover is a true

rst order acoustic type that provides

the utmost in spatial and depth imaging

performance as well as overall realism.

This is the only type of crossover that

provides complete accuracy of amplitude,

phase, time, and energy, and therefore

the only type that does not distort the

musical waveform. Proper application of

this gradual-transition type of crossover

requires the use of more expensive

drivers with wider frequency ranges

than are required for use with common

quick-transition crossovers, but the benets also include improved

uniformity of the speaker’s output in all directions.

The crossover is meticulously engineered to achieve extreme tonal

neutrality and is constructed with extensive use of polypropylene

and custom polystyrene capacitors.

This graph shows the ideal response

to a step signal, which like music,

contains harmonics with phase and

time relationships.

This graph shows how the woofer

signal (red) and the tweeter signal

(blue) from the common 4th order

crossover add to produce a distorted

waveform (black).

This graph shows how the woofer

and tweeter signal from a 1st order

crossover combine to reproduce the

waveform of the input signal.

Time

Phase Coherence

The Woofer also utilizes

an innovative diaphragm that is

basically at and therefore reduces

the diffraction of the midrange energy

usually caused by the woofer’s conical

cavity. The massive magnet powers a

very high output and low distortion

long magnetic gap, and distortion

is further reduced by the use of a

heavy copper pole ring and a copper

pole sleeve that reduces inductance

nonlinearity. The large 3 inch diameter

voice coil allows high power handling.

The very low frequencies are

augmented by a passive bass radiator

diaphragm which avoids the resonance

and noise problems of a ported

enclosure.

New geometry

diaphragm reduces

cavity diffraction and

extends bandwidth

Heavy die-cast

chassis

Thick copper pole ring stabilizes

the magnetic strength against

high power input to maintain

proper transient impact

Copper pole sleeve

reduces inductance

nonlinearity to

maintain purity

Very long,

magnetic gap

provides the

coil with a

large region

of uniform

magnet eld

Very large 5 lb. magnet

used to power the long

magnetic gap while

providing optimum

bass control

Large diameter, six layer

voice coil is much shorter

than the magnetic gap

so that it experiences

constant magnetic strength

during large excursions

Reducing Distortion

Most speaker distortion is produced because the voice coil

experiences changes in the magnetic strength as it moves forward

and back to produce sound — changes that are caused because the

ends of the coil become farther from the magnetic gap where the

magnetic eld is strongest.

By contrast, in the THIEL long gap system, all of the short coil

is always within the long magnetic gap, and therefore the coil

does not experience changes in magnetic strength as it moves.

Because the magnetic eld is constant throughout the coil’s motion,

distortion is greatly reduced. These long gap/ short coil, copper

stabilized systems do require much larger magnets, but they

produce less than one-tenth the distortion of conventional drivers.

In addition, all THIEL drivers use a copper sleeve around the central

magnetic pole that reduces inductance distortion and the woofers

also use a thick copper ring that stabilizes the strength of the

magnetic eld during long, high power excursions. These distortion

reducing methods result in noticeably greater purity of sound and

result in more effortless dynamic reproduction.

In a conventional magnet system, the coil

(red) is longer than the magnetic gap (yellow)

and therefore enters a weaker eld (green)

whenever it travels from its rest position. This

changing eld strength produces distortion.

In THIEL’s long gap design, the shorter coil remains within

a long uniform eld as it moves through its entire range,

drastically lowering distortion.

magnet

copper sleeve

copper ring

Excursion

10%

8 mm

Distortion

8 mm

10%

Excursion

Distortion

www.thielaudio.com 5

“The speaker literally ‘melts’ into the soundstage. You are never aware that the sound is coming

from two boxes in front of you . . .” —James Tanner, Bryston Electronics

Profound beauty and subtle emotions can easily be evoked by

a great performance of great music. At THIEL, our passion is to

provide this experience for our customers and, therefore, our

standard of speaker quality is delity to the music – a complete

and perfectly accurate translation of the musical signal. This

is what motivates me – to develop loudspeakers that preserve

precise sound character, provide resolution of the most subtle

musical details, reproduce an accurate three-dimensional

representation of the performance, and provide a realistic

recreation of the dynamic contrasts in music.

Achieving this level of performance is made more challenging

because, while some aspects of speaker performance can be

measured and described by specications, other important

aspects cannot, and achieving the highest level of performance in

these respects is often even more difcult. In other words, while

great specications are necessary for great performance, they are

not sufcient – there is much more to music and its reproduction

than can be captured by a few numbers.

For the CS3.7, my goal was to achieve a level of performance

greater than any previous product by incorporating everything

we have learned and every innovation we have developed over

the last 30 years, and then adding some exciting new ideas to

overcome limitations of previous designs.

I hope you nd the CS3.7 speakers as rewarding to listen to as

they have been for me to develop.

The enjoyment of music is a uniquely rewarding and

inspiring human experience.

Performance Summary

The CS3.7 achieves the following major performance

attributes:

• Extremely accurate tonal response achieved by exceptionally

accurate frequency response, very low diffraction, and

elimination of signicant resonances. Octave-averaged

response is within ±0.5 dB.

• Very high resolution of detail achieved by drastic reduction

of audible diaphragm resonances, very non-resonant,

sonically inert cabinet, time coherence, extensive use

of premium quality polystyrene and polypropylene

crossover capacitors and numerous other details of design,

engineering, and construction.

• Truly realistic and natural imaging provided by complete

elimination of phase distortion (true minimum phase

response), time coherence, exceptionally wide and even

dispersion of energy at all frequencies enhanced by rst-

order crossover system, low diffraction, and very low levels

of delayed resonant energy.

• Preservation of dynamic contrasts achieved by very low

driver distortion, high efciency, very low delayed energy

storage, and very low power and thermal compression.

Specications

Driver complement:

Tweeter: 1 in. (2.5 cm) aluminum dome, 64 g (2.3 oz.)

neodymium magnets, copper pole sleeve, short

coil/ log gap design with 3 mm Xmax, coincidently

mounted with midrange

Midrange: 4.5 in. (11.5 cm) with wave-shaped aluminum

diaphragm, 3 in. diameter voice coil, 115 g (4 oz.)

neodymium magnet, copper pole sleeve, short coil/

long gap design with 6 mm Xmax, die-cast chassis

Woofer: 10 in. (25.4 cm) with wave-shaped aluminum

diaphragm, 3 in. diameter voice coil, 5 lb. (2.27 kg)

magnet in a 13 lb. (5.9 kg.) structure, copper pole

ring, copper pole sleeve, short coil/ long gap design

with 14 mm Xmax, die-cast chassis

Passive Bass Diaphragm: 10 in. (25,4 cm) wave-shaped

diaphragm

Bandwidth (-3 dB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Hz - 35 kHz

Frequency response . . . . . . . . . . . . . . . . . . . . . . 33 Hz - 26 kHz ±2 dB

Phase response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . minimum ± 10°

Sensitivity (2.8v - 1m, true anechoic). . . . . . . . . . . . . . . . . . . . . 90 dB

Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 ohm (2.8 ohm min)

Recommended power . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 - 600 watts

Size (w x d x h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.5 x 21 x 45 inches

(32 x 53 x 114 cm)

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 lb (41.5 kg)

The blue graph is the on-axis anechoic frequency response.

The green graph is the octave-averaged on-axis response. This

correlates with perceived tonal balance.

The red graph is the octave-averaged 30° off-axis response. This

correlates with the room’s ambient energy.

10K

Frequency

-5

-10

10020 20K

Amplitude — dB

44.9” / 114 cm

12.6” / 32 cm 18.9” / 48 cm

21.3” / 54 cm

www.thielaudio.com

THIEL CS3.7 in Morado nish with optional Outriggers.

rev0608

Andere Handbücher für Coherent Source CS3.7

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