The Carbon MK IV Omnidirectional Loudspeaker
The Carbon MK IV Omnidirectional Loudspeaker
The Carbon MK IV Omnidirectional Loudspeaker
The Carbon MK IV Omnidirectional Loudspeaker
German Physiks

The Carbon MK IV Omnidirectional Loudspeaker

Regular price $64,000.00 $0.00 Unit price per

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The Carbon Mk IV is the latest version of another long running German Physiks design. Finished in high polish carbon fibre with a deep, clear lacquer coating,  it is a luxury version of the Borderland Mk IV, using the same crossover and cabinet, with a single DDD driver and a downward firing 12-inch woofer. Like the Borderland, the Carbon MK IV produces exceptional dynamics and resolution, together with the German Physiks hallmark musicality and three-dimensional stereo imaging.


The Carbon MK IV loudspeaker uses a single carbon fibre German Physiks DDD driver mounted on top of a slim, octagonal, floor standing cabinet, with a downward firing 12-inch woofer set in its base


Improved Bass, Resolution and Dynamics

The Carbon MK IV has always been an exceptional performer. The latest version has a new crossover design that provides significantly better bass, with improved integration with the DDD driver, resulting in exceptional top to bottom coherence. The resolution and dynamics have also been noticeably improved, removing another veil between the listener and the music.  All these improvements come together to produce a sound that is truly effortless.

Extended Bass with Low Distortion

The Carbon Mk IV uses a single 12-inch woofer of the same type used in our prestige Loreley model. This provides a degree of bass extension normally associated with high quality component sub-woofers. Most impressive is that this is achieved with a cabinet of relatively modest dimensions, making this a loudspeaker that is easy to live with.

The bass driver is located at the bottom of the cabinet and works in a “sealed” enclosure. This enclosure is linked via a small opening to a smaller cavity located at the top of the cabinet. This cavity acts as a Helmholtz Resonator and is tuned to the resonant frequency of the main bass enclosure and ensures a smoother bass response.

The heart of all German Physiks loudspeakers is the unique omnidirectional DDD driver

The German Physiks DDD driver uses a cone made of extremely thin (0.15mm) carbon fibre. This is very light, but also very rigid. Each driver is hand-built by a skilled technician in our factory in Germany. This is a painstaking process that takes 6 hours. After assembly, each driver undergoes a series of rigorous tests. It is then subject to a 96 hour pre-aging process, playing specially selected music at high level. Finally, it is retested and put together with another driver to form a  matched pair.

The DDD driver has two key distinguishing features

1. It is omnidirectional, meaning that it radiates the sound evenly around it.
2. It has an exceptionally wide operating range. In the Carbon MK IV it covers the range from 190Hz up to 24kHz – almost 7 octaves.

This extremely wide range is achieved by the use of 3 modes of radiation

Pistonic radiation
Bending wave radiation
Modal radiation

By comparison, most loudspeakers use drivers that only use pistonic radiation. These have a much narrower operating range and as the frequency rises, they tend to concentrate their energy into a progressively narrowing beam.

Quick and Easy to Set Up

The DDD driver’s omnidirectional radiation pattern and wide operating frequency range make the Carbon MK IV less critical of positioning in the room than conventional loudspeakers, so they are usually very quick and easy to set up. In addition, because the Carbon MK IV is omnidirectional, there is no toe-in adjustment to worry about, which is one less variable to deal with on set-up.

The Carbon MK IV will drive rooms up to 90 square metres  (950 sq ft) in size, yet the footprint is a modest 404mm x 404mm (15.9” x 15.9”). It can also work well in smaller rooms. We have successfully used them at shows in rooms as small as 285 sq ft (27 square metres), but as with any loudspeaker, we always recommend a home demonstration before you make a final choice.

High quality Input Terminals

Two sets of high quality WBT nextgen™ loudspeaker terminals are fitted allowing the Carbon MK IV to be bi-wired or bi-amped. High quality jumpers are supplied to enable the loudspeaker to be used with just one set of loudspeaker cables.

Adjustable High Frequency Output

Jumpers on the rear panel allow the high frequency output level to be adjusted in 4 steps: -2dB, flat, +2dB and +4dB. This allows the user to easily compensate for the variations in the absorption of high frequencies that occur due to different types of furnishings and room constructions.

Low Resonance Cabinet Design Enhances Transparency

The Carbon MK IV uses an octagonal cross-section cabinet constructed from heavy panels of MDF, with re-enforcements fitted to critical points within the structure. The use of an octagonal cross-section allows the individual panels to be made smaller and therefore stiffer than they would be if a conventional square or rectangular cross-section were used. This construction minimises the colouration caused by cabinet resonances, which would otherwise degrade the loudspeaker’s ability to resolve fine detail and so reduce its ability to produce a sense of realism.

Residual resonances are minimised by applying a special damping material called Hawaphon® to the inside of each panel. 

Hawaphon® is a polymer sheet containing a matrix of small cells filled with very fine steel shot and was originally developed as an anti-surveillance measure for use in military and government buildings. It adds mass to the panel to reduce the resonant frequency and the ability of the shot in each cell to move against each other provides a very effective way of converting vibration energy into heat. Hawaphon® achieves a broadband attenuation of structure-borne sound of more than 50dB, which is a remarkably high figure. 

Finally, to damp resonances of the air within the cabinet, the whole of the inside of the cabinet is lined with a thick layer of high-density felt.

Designed for a Lifetime of Listening Pleasure

As you would expect from a German product, the quality of construction and reliability are first class. We use the same quality of parts in the Carbon MK IV as in our reference products, where we design for a minimum life expectancy of 25 years.

For this reason we have selected highly corrosion resistant V4 grade stainless steel for the DDD driver support pillars, terminal mounting plates and all the screws.

Meticulous care and attention is paid during the manufacture of the Carbon MK IV. Prior to assembly all components and materials are subject to a rigorous inspection. We also carry out detailed inspections at each stage of the manufacturing process. We can afford to do this as we build our products by hand in small batches. After assembly, the performance of each loudspeaker is measured. Then it is burnt in for at least 12 hours and measured again. Once the burn process is complete each loudspeaker is given a final detailed physical inspection before being packed.

Product Finish

The sides of the Carbon MK IV’s loudspeaker cabinet are covered with several layers of bi-directional, resin impregnated carbon fibre, which are applied using techniques originally developed for the aircraft industry. Several layers of clear lacquer are then applied on top of this. Each layer has to be allowed to fully harden before it is hand polished and the next layer applied. This has to be done with great care and is a time consuming process, but the end result is a truly luxurious finish. All other parts of the Carbon Mk IV are finished in high polish black polyester.

Hand Finished For Ultimate Quality

Because the look of our products is as important as the sound, all cabinets are hand built and finished in Germany by skilled cabinet makers for the best possible furniture grade finish.

They are built in small batches, so that they can maintain a consistently high level of quality. Nothing is rushed.

Product Specifications

4 ohms

Frequency Response
28 – 24,000Hz

Power Handling
Nominal 300W
Short term 600W

Amplification required
Minimum 160W/4 ohm

Crossover frequency

Crossover slopes
DDD section
12dB/octave electronic & 18dB/octave acoustic
Woofer section 12dB/octave electronic & 18dB/octave acoustic

High frequency adjustment
-2dB, flat, +2dB and +4dB centred at 8,000Hz

86.1dB for 1W at 1m

Operating principle
2-way loudspeaker with 360° surround radiation
using the German Physiks DDD driver

Input connectors
2 sets of WBT nextgen™ binding posts

1 x carbon fibre DDD driver
1 x 12-inch woofer

Recommended room size
15 - 90 square metres
160 – 950 square feet

Carbon Fibre

404mm W x 1,229mm H x 404mm D
15.9" W x 48.4" H x 15.9" D

54kg / 119lbs

5 years

As part of our process of continually improving our products, we reserve the right to change specifications without notice.

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