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Floor-standing speaker (Dark cherry)

4 Reviews

Item # 684CS37DC

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Our take on the THIEL CS3.7

The secret to the CS3.7's incredibly lifelike sound starts with a newly designed midrange driver. The aluminum diaphragm features ridges extending from the center to the outer edge. These ridges add strength to the driver, giving it far greater stiffness than typical diaphragms, or even those made from exotic materials. This design achieves such great stiffness that the midrange continues to operate perfectly all the way up to 20 kHz. The result? An open, transparent sound that includes every nuance of the original source material.

THIEL's best tower speakers

THIEL designed the CS3.7 with one idea in mind — to provide the listener with the most realistic and musical sound reproduction possible. To achieve this goal, THIEL loaded the CS3.7 with cutting-edge technologies while paying careful attention to each and every detail of design and construction. These speakers won the Consumer Electronics Show's 2007 Innovations Design and Engineering Award — THIEL's 22nd such award in their 31-year history. With the CS3.7, THIEL took everything they've learned over the past 31 years to create one of the finest speakers available today.

Lifestyle shot

Unsurpassed sound with impressive midrange clarity

Speaker Cutaway

An aluminum woofer delivers deep, punchy bass.

The secret to the CS3.7's incredibly lifelike sound starts with a newly designed midrange driver. The aluminum diaphragm features ridges extending from the center to the outer edge. These ridges add strength to the driver, giving it far greater stiffness than typical diaphragms, or even those made from exotic materials. This design achieves such great stiffness that the midrange continues to operate perfectly all the way up to 20 kHz. The result? An open, transparent sound that includes every nuance of the original source material.

Remarkably clear highs

A high-output aluminum tweeter produces crisp highs, thanks in part to a unique motor structure that includes a total of five neodymium magnets. The CS3.7 houses the tweeter inside the midrange to maintain the proper time alignment, for unparalleled accuracy and realism. You'll enjoy crystal-clear sound with pinpoint imaging and an exceptionally wide, deep soundstage.

Richly detailed, musical bass

Bass comes courtesy of an aluminum woofer and passive radiator, each with a die-cast chassis. A motor structure consisting of a short, 3" diameter voice coil sitting inside a large magnet effortlessly drives the woofer. Unlike the voice coils found in most speakers that extend outside the magnet, the deliberately short voice coil always "sees" the optimum magnetic field as it travels back and forth. This eliminates distortion caused by variances in magnetic strength. The passive radiator increases the speaker's output. It all adds up to accurate, musical bass that perfectly complements the treble without being "boomy" or overbearing.


exploded view

Speaker Crossover

The advanced crossover ensures that your music is faithful to the original signal.

State-of-the-art crossover

The "unsung hero" of any speaker is the crossover — it directs the right frequencies to the right drivers so you don't have a tweeter trying to reproduce bass and a woofer trying to reproduce highs. THIEL meticulously engineered their first-order crossover to achieve tonal neutrality. The advanced crossover ensures that musical information such as amplitude, phase, and time remain faithful to the original signal.

An exquisitely crafted cabinet

Cabinet pieces

The super-strong cabinet features 15 layers of hardwood, laminated together under high pressure. Curved edges reduce unwanted diffraction while creating non-parallel surfaces to minimize sound-muddying internal resonance. The formed aluminum cabinet top provides enormous strength, virtually eliminating unwanted vibration. Its rounded shape around the midrange eliminates diffraction of energy from the mid and tweeter, and helps minimize resonances within the cabinet.

The machined aluminum front baffle is more than 30 times as strong as the usual MDF to provide an incredibly rigid mounting surface for the drivers. The sloping angle of the baffle also positions the voice coils of all three drivers on the same plane. This allows all the frequencies to reach your ears at the same time, giving you the most complete and accurate sound reproduction possible.

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Product Highlights:

  • recommended power 100-600 watts
  • frequency response 33-26,000 Hz (±2dB)
  • 4-ohm impedance — suited for high-current amplifiers
  • sensitivity 90 dB
  • 1" aluminum dome tweeter with neodymium magnet structure
  • 4-1/2" wave-shaped, aluminum midrange driver
  • 10" wave-shaped, aluminum woofer
  • 10" passive radiator
  • machined aluminum front baffle
  • sloped cabinet provides time coherence between woofer and midrange/tweeter array
  • binding post connectors
  • 12-1/2"W x 45"H x 21"D
  • warranty: 10 years
  • Our 60-day money-back guarantee
  • sold individually

What's in the Box:

  • Dark Cherry floor-standing loudspeaker with magnetically attached grille (removable)
  • 4 Stabilizer feet
  • Owner's Manual
  • Packing Instructions

THIEL CS3.7 Reviews

Average Customer Review(s):

(4 Reviews)

CS3.7 issues

David S. from Silver Lake Ohio on 7/23/2012

I helped set up my brothers new CS3.7 speakers. He has a NAD C375BEE amp with the NAD preamp. Initially I was surprised how tinny the sound was and the depth of the sound seemed flat. I understood there was a break-in period, but I had doubts that there would be enough improvement to compensate from what I heard initially. My brother called me after he had about 300 hours on them and I was surprised at the improvement, but it still wasn't up to snuff. We replaced the Monster cables with upgraded cables and then added a Klipsch S-112 subwoofer. The difference from what we heard initially was amazing. We can't push the amp too hard, but at moderate sound levels I don't know when I have heard speakers this full and rich. They are very responsive with no noticeable lag. Orchestral horns are so impressive that hearing them live would be a disappointment. I have a fair amount of studio experience over my 60+ years and these speakers rival any reference speakers I remember.. They are simply magnificent. Just one word of caution, the speakers will will expose weaknesses in your system you never thought you had and they need a few hundred hours to season.

Pros: Simply Glorious sounds, accurate and rich. This is a benchmark speaker that will thrill any audiophile.

Cons: Requires 300+ hours of break-in to season the sound. They will reveal flaws in your system and you might need an amp and cable upgrade to discover what these speakers are capable of.

Allow for break-in!!

Aaron from Charlotte, NC on 4/21/2010

Fresh out of the box, these speakers are almost unbearable. I've read all over about the break-in and how irritating they can be at first, but I had no idea that they were this bad. Definitely bordering on shrill. But alas, FINALLY (I'm guessing 100-150 hrs.) they are really coming into their own and settling down. (I put a CD on loop when I left for work.) That being said, they are now GLORIOUS. And what gives me goosebumps is that I know I have another 50-100 hours to go before they really open up. Coming from a high-end set-up, I forgot how easy and satisfying a simple solid state set-up can be. To echo others, make sure you have the juice to run these. I currently run a 250 watt amp with T-14's cables and even though it sounds fine so far, I can tell the Thiel's can take so much more. (Plans to upgrade both amp and cables in the future.) The only thing I would probably improve on is the bass. While fine for most, bass lovers will be disappointed. I always play Sigur Ros's "Saeglopur" off of the album "Takk" and when the drums kick in is how I judge the bass. Definitely lacking some there. (Plans to add two JL Audio Fathom F112's in the future. I borrowed my brother's Velodyne's and WOW.) While no speaker will ever be perfect, throw in two subs, and these IMO are about as close as you'll ever get.



Initial Review

EoFeb2008 from San Jose, CA on 2/10/2008

Excellent value for music and home theater application. Furniture grade construction, beautifully done. Excellent sensitivity and able to fill a large 25x30 room with ease. For best performance, requires a top notch audiophile amplifier that has at least 150W or more. This review is based on such amplifiers. Disappears and leaves a sound stage that is deeper and wider beyond the speakers. Has excellent imaging when set up properly. Beautiful highs, no harshness. Sweet mid-range and excellent bass articulation. Excellent uniformity from the highs to the low. Very neutral but not cold analytical and has no overt character of its own. If you use mediocre source components or poor cables, these speakers will expose the weaknesses of these components without mercy. Works wonderfully with higher power ARC tube amplifiers. Our speakers have approximately 48+ hours of break-in time as of this writing so their voices are not yet fully open. Will report back after 200+ hours when there is more information.




jmccoy from Los Vegas, NV on 9/4/2007





Hands-on research

Features and Specs

Enclosure Passive Radiator
Finish Wood Laminate
Color Dark Cherry
Tweeter Dome
Tweeter Size (inches) 1
Midrange Size (inches) 4.5
Woofer Size (inches) 10
Woofer Composition Aluminum
Woofer Surround Rubber
Built-in Powered Sub No
Video-Shielded Yes
Connector Type Binding post
Bi-amp Inputs No
Parts Warranty 10 Years
Labor Warranty 10 Years
Power Range 100-600
Frequency Response 33-26,000 Hz
Sensitivity 90 dB
Impedance (Ohms) 4
Amplifier Power ---
Height (inches) 45
Width (inches) 12-1/2
Depth (inches) 21
Weight 91 lbs

Product Research


Overview: The THIEL CS3.7 floor-standing loudspeaker incorporates several new innovative design techniques that greatly improve performance in a three-way, floor-standing loudspeaker. The CS3.7 delivers a much purer and more open midrange and lower bass response coupled with a sweeter and smoother high frequency performance than conventional three-way loudspeakers. The CS3.7 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 and clarity. The CS3.7 achieves the following major performance attributes:

  • Extremely accurate tonal response
  • Very high resolution of detail
  • Truly realistic and natural imaging
  • Preservation of dynamic contrasts

Driver Design: The CS3.7's drivers represent state-of-the art technology and engineering. Unique short coil/long gap motor systems dramatically reduce distortion; very rigid aluminum diaphragms eliminate resonance coloration for exceptionally uniform frequency response; long excursion motor structures provide greater output capability for realistically high volume levels; and copper rings are used for magnetic field stability to greatly reduce distortion from secondary effects.

  • High Output, Low Distortion Tweeter: The CS3.7 features a 1" aluminum dome tweeter with 64 g (2.3 oz) neodymium magnets, a copper pole sleeve, a short coil/ log gap design with 3 mm Xmax, and is coincidently mounted with midrange. The CS3.7 tweeter provides much lower distortion and higher output. 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.
  • Midrange Driver: The CS3.7 features a 4.5" midrange with a wave-shaped aluminum diaphragm, 3" diameter voice coil, 115 g (4 oz) neodymium magnet, copper pole sleeve, short coil/ long gap design with 6 mm Xmax, and die-cast chassis. The midrange driver should 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 CS3.7 features 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. This new diaphragm geometry also has a second important benefit that derives from its shape. The diaphragm is basically flat 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.
  • Woofer: The CS3.7 features a 10" woofer with a wave-shaped aluminum diaphragm, 3" diameter voice coil, 5 lb magnet in a 13 lb structure, copper pole ring, copper pole sleeve, short coil/ long gap design with 14 mm Xmax, and  die-cast chassis. The woofer also utilizes an innovative diaphragm that is basically flat 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" diameter voice coil allows high power handling. The very low frequencies are augmented by a 10" passive bass radiator with a wave-shaped diaphragm which avoids the resonance and noise problems of a ported enclosure.

Crossover Network: The CS3.7 crossover is a true first 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 benefits also include improved uniformity of the speaker's output in all directions. The CS3.7 crossover is meticulously engineered to achieve extreme tonal neutrality and is constructed with extensive use of polypropylene and custom polystyrene capacitors.

Time and Phase Coherent: As with all THIEL loudspeakers, the CS3.7 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 CS3.7 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.

Cabinet Construction: 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 CS3.7 utilizes an aluminum cap, machined aluminum front baffle, and 15-layer ply cabinet walls to practically eliminate unwanted vibration for utter tonal neutrality and exceptionally realistic imaging.

  • Aluminum Cap: The CS3.7 cabinet top is made of formed 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 mid and tweeter. In addition, the rounded shape helps minimize resonances within the cabinet.
  • Cast Aluminum Baffle: The speaker's front baffle 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. Also, the baffle's sloping angle positions the drivers for proper time coherence.
  • Cabinet Walls: The speaker 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-thousandths 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. 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 also creates non-parallel walls to minimize internal resonances.
  • Sloping Front, Rounded Edges: Another cabinet function is to position all the drivers properly so that the listener hears the sound of each driver at the same time, preserving the sound's timing information. Because all of the sound's harmonics are heard in perfect synchrony, all the music's spatial cues are reproduced naturally. The CS3.7's sloping front is designed to achieve time coherence between the sonic output of the woofer and the midrange/ tweeter array. 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 also the 3.7 provides exceptional results with its gently rounded cabinet top and sides.

Note: The CS3.7 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. THIEL CS3.7 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 CS3.7 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

Connections: The CS3.7's input terminals are located on the lower rear of the speaker cabinet. The CS3.7 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 CS3.7 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

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 CS3.7's are designed to be used with amplifiers rated up to 600 watts per channel (into 4 ohms). The CS3.7 is of high efficiency (90dB) and therefore can work well with smaller amounts of power from a quality amplifier.

Placement: The CS3.7s 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 performance.

  • 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 reflections.
  • 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 CS3.7s 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 CS3.7s 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 installed.

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.

Break-In Period: The CS3.7'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 of playing.

10 Year Warranty: THIEL warrants every THIEL model CS3.7 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.

Our Product Research Team

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