Spirit 4 - Powerful and dynamic sound

The Spirit 4 is a very flexible and versatile bookshelf speaker which can be either used as an excellent stereo setup or integrated into a thrilling surround system. As the Spirit 4 uses the same tweeter and mid/bass driver like the Spirit 11, it is a perfect match and able to perform with highest precision and accuracy. Despite the handy size of its cabinet, the deep bass qualities are astonishing. The usage as a stereo system is especially recommended in rooms where powerful and dynamic sound is desired but where there is not enough space for larger speakers.

Drivers
Drivers

The tweeter which is used for Spirit 4 is a 25 mm silk dome which has been developed and adjusted especially for this application over years. It has been designed together with its waveguide to achieve a perfect match concerning precision and dynamics. As mid/bass driver, a customized long-stroke woofer is used which has proven its capabilities concerning the reproduction of deep yet dry bass. It harmonizes perfect with the tweeter which leads to a natural and balanced sound.

Sound Tuning
Sound Tuning

The backside of Spirit 4 offers several possibilities to adjust the sound to the room acoustics and your personal preferences. The jumper at the speaker terminal can be used to adjust the tweeter level which is very helpful in modern reverberant surroundings. Furthermore it is possible to alter the basic characteristics of the speaker by using the attached plug to close the bass reflex port. If the speakers is placed near a wall, this possibility helps to optimize the sound.

Cabinet
Cabinet

A 25 mm thick front baffle out of MDF ensures maximum stability and best working conditions for the drivers to act precisely. The side walls of the cabinet are made out of 18 mm strong MDF and additionally stiffened which leads to the high weight of 6.8 kg per speaker. These efforts to reduce internal resonances are furthermore supported by the special damping material which is used inside the cabinet. As a result, the construction avoids vibrations and thus improves the precision even further.

Surface
Surface

Spirit 4 is available in two colours to ensure a good integration into any surrounding. Both, the matte black as well as the matte white multi layer paint are applied in a complex procedure which leads to a high class finish which is probably unique in its price range and makes the Spirit 4 a real ornament.



Terminal
Terminal

The gold plated screw terminal guarantees an optimum lock for your speaker cables. Thus a safe connection and best signal transmission can be ensured. In addition the terminal contains the jumper for the adjustment of the tweeter.

Front Cover
Front Cover

The pluggable cover protects the drivers on the one hand from dust and on the other from possible damage. To ensure perfect sound transmisssion, the cover is sound transparent and does not have any influence on the sound of the speaker.

Further Information

Tweeter

The tweeter of the Spirit series is a 25mm silk dome which has already proven its great abilities concerning its power handling and impulse response. It is driven by a high performance magnet system to optimize the sensitivity, dynamics and power handling. The cooling is provided by a low viscosity ferro fluid and a high power alloy voice coil made of aluminum and copper. Due to the waveguide technology the relative SPL capacity and sensitivity increases which leads to a minimized distortion both in high and low playback volume. The waveguide helps further to balance the dispersion in a perfect way to give a similar sound character independent of the angle. Furthermore, the waveguide allows a lower crossover frequency which makes the dispersion pattern of the mid/bass driver match the pattern of the tweeter. Thus, the overall dispersion is perfectly balanced and controlled. The dome itself has a built-in protection against damages and finds back to its original shape after a gentle push. To ensure a stiff and stable connection to the cabinet, the front is made out of 5mm thick massive aluminium covered with rubber to dampen resonances.


Midrange / Woofer Driver

The mid/bass driver originates our own development laboratory and is customized to fit the Spirit speakers perfectly. Its membrane consists of acrylonitrile butadiene styrene (ABS) and a long fiber pulp mixture in a special sandwich construction to even further increase its stiffness. Due to the lightweight materials, the cone provides an extraordinary stiffness-weight ratio and reduces resonances effectively. The spider is made of a mixture of cotton with nomex fiber. To ensure a nearly perfect impulse response, a specially developed and extremely strong magnet system is used. Its linearity provides a long stroke without compression and enables the speaker to handle a wide frequency range. Thus, the speaker can perform any stroke with highest accuracy. The voicecoil wire is made of a high temperature alloy of aluminium and copper to ensure an effective heat dissipation. To further avoid any edge resonances, a specially customized butylrubber surround is used.


Crossover


The ornate frequency crossover ensures a perfect transition between the drivers. Thus the frequency crossover as well as the phase transition are optimized to provide maximum listening pleasure. The high class capacitors and low impedance coils ensure a perfect signal transmission. To further minimize any unintended influences, the internal cables consist of high purity copper which reduces the transmission resistance.

Sound Tuning


Since every room is unique from an acoustical point of view, the speakers of the Spirit series are equipped with several room tuning possibilities. The bassreflex port on the backside can be closed with the attached plugs which alters the basic characteristics of the speaker. It is for example possible to place the speaker near a wall and drive it in closed mode to compensate the bass increase due to the walls. Furthermore there is a jumper located at the terminal of the speaker which can be used to adjust the tweeter level to the prevailing acoustics and the personal preferences.