“focused on the customer, working to the future”
Built from the foundation of a company with decades of manufacturing experiences and partnered with an engineering group touted for their revolutionary designs
SB Acoustics was formed to bring an alternative to the hi-end transducer market. Marrying the design talents of Danesian Audio ( Denmark ), a company filled with industry veterans, responsible for many well known and revolutionary designs, and manufacturing partner Sinar Baja Electric ( Indonesia ), a vertically integrated company with more than 30 years of transducer manufacturing experience.
We feel we have been able to create an affordable line of products, without compromising acoustic performance for cost. Ultimately, we invite you to judge
Best Regards
David A Stephens
Director. SB Acoustics
We began the formation of the NRX line with the development of the 10” and 12” woofer. The goal has been to design fairly simple but yet optimized woofers at an affordable price - high performace / cost ratio. There will always be compromises of course, but we believe we have made the right ones.
The coil former material is fibre glass. It is fundamental to use a non-conducting former material to ensure a low mechanical loss/high Qms, which we believe is important. We prefer the damping to be electrical rather than mechanical, as this puts the amplifier in control, which is important if you want the driver to actually reproduce the input signal.
The woofers feature 3” copper wire voice coils for improved power handling. The large diameter voice coil also allows for efficient ventilation through the centre pole. The basket is also vented under the spider. This type of ventilation reduces compression to an absolute minimum, which is necessary to ensure good dynamics.
The motor structure is simple, but all dimension have been optimizes to ensure BL symmetry and good saturation of the iron in the coil region.
The surrounds are low damping SBR with a low shore hardness, which ensures good linearity. Stability is obtained by making the rolls just thick enough to withstand the high pressure in smaller cabinets without “collapsing”. The geometry of the strong Nomex type spider is designed to complement the surround and the overhang of the voice coil. The suspension allows for the top/bottom of the coil winding to reach the bottom/top of the top plate – but no more. The surround and spider start limiting at the same time with a linear region slightly exceeding that of the coil overhang (which is a much as ± 11 mm). This all ensures good linearity without hard clipping or mechanical damage to the cone at high levels.
The cone is made in house using a proprietary blended hard stiff natural materials we call NOREX.Cone stiffness is important to a woofer, as it should behave like a piston that moves air without flexing. This clearly improves bass reproduction.
The baskets are cast aluminium to insure a rigid open structure. This makes the optimum foundation for the moving parts and has been designed not only to look good but also to offer some unique mounting options.– They even come with gaskets pre-mounted.
The design considerations have been the same for the midwoofers. For the midwoofers we have selected the cone material we found to have the most natural sound character. For each of the midwoofers, we have carefully chosen the cone weight, as this is also a very important parameter in the pursuit of a natural and balanced sound character.
The 5” and 6” midwoofers use an extended copper cap on the pole piece, which controls variations in voice coil inductance, thereby lowering modulation distortion in the important midrange area. The copper cap also reduces the inductance. This results is increased bandwidth and improved transient response.
Best Regards
Ulrik Schmidt
VP of Engineering
