Just got my LP G109A about an hour ago. I am running it from Macbook to Dacport Slim (line out setting) and listening with some HE-500s. I have it at default gain setting, and I have to keep the volume at about 2 o'clock for my ears. Maybe I need to open her up and set it to high gain?
I have to say it does sound better than just using the Dacport Slim by itself. No matter what, it is time to A B some headphones with the double jack ports! I will write down some layman impressions about this amp as I notice things.
Edit: Two hours into owning the G109A. I don't know all these fancy audio terms, but my random music mix struck some Joplin's "Down on Me" and the hairs on my arm stood up. Afterwards, some of Ray's "I've Got a Woman" started playing, and I was hopping around in my office chair. Was it the amp that made a difference? I don't know, but i'm still listening, and I'm still having a good time.
Edit: I have been running the G109A for about 8 or 9 hours, and I have listened to it for about 5 hours total. Compared to my only other amp, the Dacport Slim, things sound fuller and smoother-- much to my enjoyment. I like that there seems to be a bit more reverberation in some of my music that I didn't notice before. However, there is a pristine ring from some female vocals, Genevieve from Company of Thieves comes to mind, that I can't decide if I prefer. Sometimes I really like that clean soaring sound that is produced, and other times I miss that tiny touch of gritty raspiness that I'm not hearing as much of with this amp. Also, unlike the Dacport Slim the G109A does not run warm. It has stayed cool to the touch throughout. Overall, I would say I am enjoying this amp greatly. It's giving me upgrade fever for a new DAC!