Mjcmt, sorry for the late response. I have been out of the hobby for awhile. Unfortunely I had to sell my Adcom amp and pre. To answer your question, I think the 5300 sounded very detail with a good soundstage. I had a 545II also and both model sounded similar. Compare to the 545II, I think the 5300 had a better bass control and definition. The midrange and high sound pretty much the same, smooth with no harshness. Dean Man, thanks! I really like my Dayton Audio DIY speakers. It sounds much more then what is worth.
System edited: Hi Audiogoner. I have been out of the hobby for awhile due to financial problems which I had to sell my Adcom pre and amp. Meanwhile, I have been starting over somewhat since I have not sold my speakers. Right now, I have bought a SCS Model 2150A amp and a Behringer Xenyz 502 mixer( using as a preamp). Although the Behringer 502 is a pro audio unit, it does the job nicely as a preamp. I dont intend to keep this unit in my system in the future as I will be using it for gigs. Hopefully I will be saving up for a preamp.
When you settled on your GFA5300 did you compare it to other amps? Years ago I had a GFA545 II and it was just so-so. Are the newer Adcom's with 4 digit model numbers better? I'm curious about trying one of these newer ones.
On another note I likewise have have built 3 prs of diy speakers. I sold the first 2 and I'm not using my current floorstander in my spare room rig. And I also have a 10x13 room.
I do use a computer as a source. The only problem is that I do not have a DAC and that I am using the headphone out. I know it does not sound the same as the DAC that is why Im looking into getting a DAC.
The Adcom amp sound great with great bass response, very articulate and clean. The highs is very detail and smooth without being grainy.