Traditional linear amplifiers such as Class-A and Class-A/B amplifiers are bulky and inefficient. The inefficiency compromises the reproduction of music signal's full dynamic range. Its resulting higher operating temperature also shortens the useful life of the electrolytic capacitors used in abundance in these amplifiers. To get around that problem, today's better amplifiers employ bulky heatsinks and costly linear power supplies to provide enough headroom to handle the full dynamics. These huge power supplies are unregulated and could add noise and ripples at low volume. Besides being inefficient, linear amplifier depends on transistors or MOSFET devices to generate power. Big (high-power) bipolar transistors or MOSFETs have inherently low bandwidth and do not provide adequate audio performance. Therefore, smaller (up to 20+) MOSFETs with decent audio bandwidth performance are paralleled to provide sufficient power. Each MOSFET has an inherent junction noise - actually worse audio low frequency noise than bipolar transistors - and the aggregated noise corrupts music reproduction. What you hear is haziness and a lack of clarity in music reproduction. MOSFETs are used in parallel because technically, they are easier to drive although they have inherently higher distortion than bipolar transistors, which are much harder to drive when they are paralleled. Class-AB amplifiers - the most popular amplifier circuit - have to overcome the inherent crossover distortion that occurs when the audio signal goes from negative to positive and vice-versa, crossing the zero region where gains of transistors are much reduced. They are actually down to zero when the transistors stop conducting current. Close-loop system designers know that lower gain means higher inaccuracy of the amplification loop.
The privacy statement on Optoma (hereinafter referred as “We”)’s website（http://http://nuforce.optoma.com）(hereinafter referred as “Website””) is the declaration of personal information protection. Due to the property of internet, We will inevitably interact directly or indirectly with visitor to our Website; therefore this declaration hereby explains what personal information we collect from Website visitors, the utilization of personal information and protection measures. Please ensure to read it carefully:
We may not collect your personal information without your consent or law’s permission. We obtain your personal information such as your contact, billing and shipping information from forms, in formats of electronic or paper, you fill in and submit on our Website for account registration, log in our Website by linking other social networking websites, customer service or personal information update.
We’ll collect your non-personal information, such as browser type, operation system and Internet Service Provider (ISP) from your IP address, and use the information to enhance your display performance. We’ll also calculate the visitor stream to improve the service and management of our Website.
We use information about you necessary to fulfill your requests, e.g. to process an order and we will send emails of our new products, exhibitions, newsletters, the latest activities and messages updated online to visitors that have registered on our Website or logged in our Website by linking other social networking websites and expressed consent to receive newsletters or promotional emails from us.
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This TOU shall be governed by and construed in accordance with the laws of the State of California, United States of America, without regard to the conflict of laws principles thereof. Any controversy, claim or dispute arising out of or relating to this TOU shall be settled by arbitration in accordance with the rules of the International Chamber of Commerce. The place of arbitration shall be in the State of California, United States of America.
The failure to enforce any part of these TOU shall not constitute a waiver of any of our rights hereunder for past or future actions.
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We may suspend or terminate your account or your use of the Website at any time, for any or no reason, without any notice, and without liability to you or anyone else. You may terminate your account at anytime. However, you are personally liable for any orders placed or charges incurred through your account prior to termination.
The Coretronic Corporation is the world's largest manufacturer of optical projectors. In 2000, the company established the Optoma brand in England. Coretronic sales locations span the world and are prominent in the US, Europe,China, and Asia. Coretronic is the prime Taiwanese projector solution.
NuForce was a company of Hi-End speakers started in Milpitas, California. It owns the technology of developing Class D amplifiers and has received many awards from audiophile magazines in the US and Japan, which has made NuForce a leading brand in the audio systems market.
Audio is essential for a successful video. Optoma, a leading brand in DLP projectors, accomplished the integration of audio-visual entertainment systems when it acquired the US audio brand, NuForce, in 2014, giving Optoma the capability to provide music lovers a comprehensive experience of audio-visual entertainment.
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