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<\/p>\nThe First Watt M2 is a two channel audio power amplifier delivering 25 watts per channel. It uses JFET and MOSFET transistors operating in Class A mode without negative feedback so as to produce a more musically life-like sound.<\/p>\n
Negative feedback is a technique in which the input gain stage of an amplifier compares the input musical signal with the output of the amplifier and outputs a signal to the remainder of the amplifier which incorporates the original music mixed with corrections to reduce the errors made by the rest of the amplifier.<\/p>\n
If an amplifier has high distortion, then negative feedback is very helpful in cleaning up the output going to the loudspeaker. Nevertheless many audiophiles view it as a necessary evil, affecting the musical quality of the sound since it involves mixing output errors and re-amplifying them. Excessive use of negative feedback creates issues with stability and although it improves the measured performance, is often associated with \u201csterile\u201d sound character, and \u201csubtracted\u201d musical detail.<\/p>\n
The M2 is a simple circuit whose output stage consists of a pair of complementary power Mosfet followers biased into pure Class A mode. These devices are the current gain stage of the amplifier, very linearly following the musical signal produced by the voltage gain stage. The voltage amplification is created through an auto-former which magnetically multiplies the input voltage.<\/p>\n
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Great attention has been paid to the linearity of the gain stages of the M2, resulting in a power amplifier whose performance is good enough to avoid negative feedback altogether. This is rarely achieved at a reasonable cost, and at this time the M2 serves as one of the best examples of the benefits of an amplifier with passive voltage amplification and no feedback.<\/p>\n
The design is extremely reliable and will never need adjustment. It achieves a relaxed sound with a very organic character and dynamics well beyond the expectations of the power rating.<\/p>\n
The simplicity and performance of the circuit allows a unique sonic experience that is likely to make you go through your entire record collection all over again.<\/p>\n","protected":false},"excerpt":{"rendered":"