I have an audio-gd compass that i use with some denon d5000's.
I believe it has the earth op amp in it.
I really like this amp and plan on keeping it. I figure it might be fun to do some customization to it.
Should I buy the opamps?
I was thinking the sun and moon versions.
Also I know they have a v.2 of the sun and moon, any input?
Also, cant these things be used on other amps as well?