2009年1月22日星期四

Song Audio


Song Audio Ltd. is a specialist high-end audio equipment manufacturer, importer, and distributor based in Canada. Song Audio manufactures vacuum tube preamplifiers, power amplifiers, and loudspeakers and imports solid-state integrated amplifiers under the marque Vasant_K from Thailand. Song Audio also distributes and supports Loth-X loudspeakers in Canada, though the original manufacturer has since closed operations in Singapore.

History
In 2001, Song Audio was established by its eponymous founder, Song Kim, in Toronto, Canada. In North America, Song Audio was one of the first to source manufacture of high-end products from Thailand (esp. Vasant_K). Song Audio was also one of the first to import and distribute single-driver crossover-less high sensitivity loudspeakers from Asia (Loth-X from Singapore). Currently, the renaissance of low power triode output vacuum tube amplifiers and single-driver loudspeakers is more established in Asian and European markets, but interest is gradually increasing in North America.

Being a specialist company, Song Audio produces its products in limited quantities and distributes primarily in North America. The Company is recognised as decidedly non-mainstream, even within the high-end community; for example, it avoids parallel design in output tubes on purist grounds and does not provide remote control handsets in its products. The Company adopts a longevity approach to its products by not phasing any out of production (its earliest products are still in production) and supports their usage world-wide by having a user-adjustable internal voltage switch between 120V/60Hz (North America) and 220V/50Hz (Europe and Asia).

Research and Development
Pre/Power & Integrated Amplifiers
In Song Audio vacuum-tube amplification equipment, the model number prefix 'SA' refers to its corporate acronym; the suffix 'MB' indicates 'monoblock' amplifier and 'SB' indicates 'stereoblock' amplifier.

Though Song Audio produces a flagship preamplifier (SA-1) with separate power supply and single-ended triode zero negative feedback 300B output monoblock power amplifier (SA-300MB), the Company's primary contribution to the typology of vacuum-tube power amplification is the SA-34SB (2003-) integrated amplifier (upper right), now in 'Cecilia' edition (lower right) made in Canada. It is one of the first in absolute purist design consisting of single-ended triode operation with zero negative feedback utilising the EL34 output vacuum tube (which is especially difficult to operate in triode mode without negative feedback). Currently, the only other such similar design appears to be from Decware in U.S.A.

The SA-34SB is somewhat unusual in aspects of its construction, including: proprietary transformer winding, bronze chassis in the original SA-34SB integrated amplifier, high-density acrylic front plate in the 'Cecilia' edition (which frequently breaks drill bits during its construction), lavish use of 18K gold plating, and solid wood side panels instead of wood veneer. By contrast to conventional wisdom of using a single sub-woofer, the Company advises using a mono pair of sub-woofers since the source of bass is directional in a live performance (the bass tends to originate from the right side of stage in an orchestra). For this reason, the SA-34SB provides stereo variable RCA outputs to independently connect a pair of sub-woofers to augment the loudspeakers without the interference of a crossover to them.

For signal wiring, Song Audio has experimented with 98% pure solid-core silver and cryogenic-treated silver plated oxygen-free copper in its circuit wiring and AC power cords; presently, the Company uses both methods in its products. For connections to AC plugs, the Company uses both audio-grade and hospital-grade connectors together with a locking hospital-grade duplex outlet (as provided with Vasant_K).

NIMH 9V Battery


12V NIMH Battery


C Rechargeable Batteries


Cell Alkaline Battery


Rechargeable NiCd Battery


Manganese Lithium Battery


12V Sealed Battery


Rechargeable DVD Battery


Radio Clock Battery


electric scooters batteries


electric scooters battery


cr2032 coin battery


3.6V Lithium-Ion Battery


Rechargeable Laptop Battery


Solar Mini Panel


Golden Power Batteries


sf6 circuit breaker


12V Portable Battery


Power Pack Battery


V W Battery


cr2450 lithium battery

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