The V12 series of amplifiers are audio amplifiers produced by Alpine Electronics. Different models of the V12 series are available, such as the AccuClass-D and MRV, but the physical and technical specifications of all Alpine V12 amplifiers are designed with the intention that they be used in automobiles or with theatre surround sound. As of 2010, the V12 series of amps are no longer produced by Alpine Electronics.
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Body and Dimensions
All models of the V12 amplifiers have slight physical differences and their exact measurements vary, but most of the models are about 1-foot wide, 9 inches deep and 2.5 inches in tall. Some models, such as the MRV F357, are built with a more narrow but deeper body, measuring 10.2 inches wide and 15.7 inches deep. Depending on the size of the amp and the hardware installed on the amp, the weight of the V12 series amplifiers ranges anywhere between 3.63 and 5.9kg. Some models, such as the AccuClass-D MRD and the MRV F345, are constructed with black coloured steel casing and a stainless steel front panel that houses a light-emitting diode (LED) display screen. Other models, such as the MRV F357, are enclosed in a solid silver metal frame and contain no digital display screen. According to a company press release from January of 2006, during the time when the V12 series was still being produced, Alpine Electronics' suggested retail price (MSRP) for its V12 series of amplifiers ranged from £292 to £617 GBP.
Each individual model of V12 amplifier had its own unique audio output capabilities. The AccuClass-D stereo sound model amp output 700 watts of power, had a signal-to-noise ratio of 90 dba (a-weighted decibels) and low pass frequencies of 30 to 200 Hz (hertz--the speed of the electricity passing through the amp). The MRV F345 four-channel sound model output 150 watts of power, had a signal-to-noise ratio of 96 dB (decibels), low pass frequencies of 30 to 400 Hz, high pass frequencies of 30 to 400 Hz, a bass boost frequency of 45 Hz and a two-way active crossover with a 12 dB crossover slope. The MRV F357 model had a four-channel power output of 50 watts and a one channel output of 150 watts. It also had a signal-to-noise ratio of 100 dB, low pass frequencies of 50 to 200 Hz, high pass frequencies of 50 to 200 Hz, a bass boost frequency of 45 Hz (with a bass boost gain of + 0 to 12 dB), six input channels, five output channels and a five-channel crossover with a 12 dB crossover slope.
Connections and Power Supply
Models such as the MRD M1005 and the MRD M605 came with untreated RCA wiring, while other models, such as the MRV F345 and the MRV F545, came with gold-plated RCA input connectors and solid copper bus bars. Some models, such as the MRV F345, were equipped with over voltage protection and over current protection, which prevented power surges from damaging the equipment. Power to the amps was supplied by STAR circuitry, a direct current power supply and a metal oxide semiconductor field-effect transistor (MOSFET) power supply.
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