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Originally Posted by nkk /img/forum/go_quote.gif
What is the difference between the Adcom Gfa-545 and the 5300? Other than power, is there a difference?
THanks,
Nkk
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The main difference is that the 545 uses bipolar output transistors and the 5300 uses mosfets. Both are Nelson Pass designs. If the models are MK II or SE, then they were modified from the original design, in house, by Adcom.
Another difference is that the original 545 had some 100 volt driver transistors that could fry when the fuses blew. This usually occurred when trying to drive speakers that regularly dip below 4 ohms. the MK II used 150 volt transistors. The 5300 is better for this type of speaker load.
They're both class AB amplifiers but the 5300 will run in class "A" for the first 10 watts IIRC.
The 5300 was one of the first American amplifiers to be completely manufactured in China. Quality control problems are common and assembly is a notch below the 545.
The GFA-545 runs warm. The 5300 runs hot and you can use it as a small room heater.
Both amps have a similar sound. I haven't listened to the 5300 for any period of time, but from what I've read it sounds warmer than the 545 with a more compressed soundstage. Less detailed in the highs than the 545, but smoother. The bass is a little tighter. The midrange a touch more recessed. Opinions are equally divided as to which amp is preferable.
The GFA-545 has many modifications and improvements available if you search the web. These are said to take it to a whole other level.