I'm a new owner of a D4. Finally I can listen to some music on my laptop with a DAC.
I bought the D4 from another head-fi'er so the unit is burnt-in.
DAC-performance is excellent, amp powered by USB is very good as well.
With my DDM's I prefer my Corda XXS, the XXS has punchier bass and is slightly warmer.
My Brainwavz M1 on the other hand sound better with the D4, must be the mids.
I would like to swap opamps. Any tips on a warmish, musical sound. I want punchy bass, but I was already happy with my RE0's and the iBasso T4 or XXS. DDM's are ofcourse bassheavier but miss the punch in the bass I get with my XXS.
HiFlights topkit LR module with stock buffers seem to be a good option, from what I am reading.
Anyone heard the ADH4841-2 and/or LMH6643? Those opamps should be supported and are for sale from iBasso as part of the D10/12 opamp kit.
Or is there some other place where I can get opamps and/or buffers?
I think you will really like the OPA1611 class-A boased opamps on a 2:1 that HiFlight sells. I like this with the stock buffers.