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USB-powered speaker kit boasts 15W audio power

Posted: 14 Sep 2010     Print Version  Bookmark and Share

Keywords:USB-powered  stereo speaker  audio 

NXT plc presents a USB-powered stereo speaker reference kit that boasts of delivering boost audio power of 15W per channel in personal computer audio. The speakers are intended to enable consumer product developers to evaluate NXT's DyadUSB amplifier module and matched drive units known as Balanced Mode Radiators (BMR).

NXT003(A) Speakers

NXT explains that a combination of patented technologies has made it possible to produce high-quality, high-power audio from a USB port that can only deliver a maximum power supply of 2.5W (5V at 500mA) to the speakers.

The first is an Audium silicon chip that is at the heart of NXT's DyadUSB amplifier module. This integrated circuit claims to be up to 20x more efficient than other amplifier chips. It exploits the high peak-to-average ratio of typical speech and music signals, operating efficiently from a low supply voltage most of the time but delivering a higher voltage to the amplifier's output transistors when they need it to handle peak sound levels.

Other patented techniques are used to cut circuit losses, minimising the power supply requirements of the amplifier. The amplifier module is closely matched to the BMR drivers. The drivers, which are already widely used in consumer electronic products, operate differently from conventional loudspeaker coils. They harness resonances in simple panel shapes to create speakers with a very flat frequency response, and wide directivity, even at high frequencies.

The evaluation speakers will be demonstrated to major consumer electronics companies from early September 2010, and are expected to be available to design engineers by the end of this year. They will be supplied with a software utility that enables the amplifier chip's on-board filters to be set up to evaluate voicing, stereo effects and other equalisation capabilities.

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