揚聲器增強技術

N'Bass™ Virtual Back Volume Technology is a sound enhancing technology to increase the acoustic performance in consumer devices with small form factors. It stands for "enhanced bass" and enables the smallest possible acoustic designs in smart phones, tablets and other portable media devices. Knowles is the only supplier who offers this specific technology for miniaturized loudspeaker systems.

N'Bass is a custom-developed material which increases the back volume seen by the loudspeaker by up to 100 %. It provides either better acoustic performance – specifically more bass – or up to 50 % smaller loudspeaker box designs with the same performance. It also facilitates the usage of bigger loudspeakers, thus providing superior sound performance within the same gross application volume.

Acts like a sponge for the air in the box
Similar to a sponge, the N'Bass material adsorbs the air in the loudspeaker box. In this way, it virtually increases the available back volume for the loudspeaker.

Speaker design options
Due to the space gained by using N'Bass™, mobile phone and computing manufacturers have more flexibility to design solutions with superior sound and optimized space efficiency.

The N'Bass™ effect
11 x 15 x 3.5 speaker with 1cm³ back volume.

The difference in the resonance frequency is about 150Hz.

This means a sound pressure level-boost below resonance frequency of approximately 3dB.