It works very well and stable here with 12V PSU.I replaced the Gold with the Premium.
Compared to the Gold, the Premium has more resolution (especially in the low frequencies) and better sound extraction.
The input DC voltage range has been changed from 18V to 27V DC, so those using an external DC power supply should be careful.
Mr. Iwamoto, the president of Telegaertner Japan, told me the imrpovements also come from integrating better vibration countermeasures.
Best regards,
Marcin