The GAN1 did not sound anything like this to me, but I only had 12 hours on mine. On my well broken in LS50 Meta speakers the sound was a little rolled off and not as clear as my Benchmark stack. The Benchmark stack is likely considered too neutral by a lot of people, but perfect for my ears, LA4 preamp | AHB2 monos | slightly warm Musetec 005 DAC | Audience FrontRow speaker cable | Audience AU24SE XLR and RCA | Fibre streaming.
On my much cleaner sounding RAAL SR1a earphone, via an RAAL adapter box, Audience AU24SX speaker cables, a brand new WyWire "Silver" SPDIF cable extending out the previously mentioned Fibre streaming, the GAN1 sound was amazing. The very best of 2-channel gear on these earphones which will show everything in the chain. This was better than the $30K warm system I sold that was the prior very best 2-channel with the SR1a, CODA 07x preamp | KRELL DUO 175XD amp or CODA #8 amp | Musetec 005 DAC | Audience FrontRow speaker cable | same streaming as before.
The current draw on the amp using this adapter box approach was more current usage than with my Thiel CS3.7 speakers (sold). The amp gets a workout. I know this because my old CODA #8 amp had meters and that showed the current draw between the SR1a and the Thiel CS3.7.
My 2-channel gear can only get you so far with the SR1a because of the adapter box. It can never approach the best dedicated SR1a amp. The GAN1 so far is the 2nd best sound I have on the SR1a. Hopefully it does not get bright with more break-in. Though I have never had an amp go from rolled off sounding (my opinion) to bright. I expect a bit more clarity on top and would be shocked it got beyond a neutral level.