I've been mixing up the DACs while listening to the AC. Yesterday I received a fully burned in Merason DAC1, an esoteric D/S DAC from Switzerland.
Using the DAC1, the sub bass of the AC was tightened up considerably, but still very strong vs. my Atlantic TRP. The detail retrieval was enhanced as well as a tighter focus on the imaging of the AC.
Like all great headphones, the AC is influenced by the upstream gear being used. The Atlantic TRP is a bass monster of a DAC and without careful consideration of what tubes are being used, the bass can get overwhelming on the AC
If you love acoustic guitars, bluegrass, or both... this recently released wonderful track, partnering the always wonderful Tommy Emmanuel with bluegrass phenom Molly Tuttle, will put a smile on your face.
Enjoying it now on my AC with wonderful tube magic...: