A new Hi Quality Headphone Amp HM1 by Zähl has been introduced shortly before the SuperBooth, where the manufacturer will be present in the wonderful „Puppenbühne“ this year together with HEDD audio, what could fit perfectly.
Their HM1 seems to be a superb preamp also for simple and small installations (like) in my living room e.g. too, for german language readers it is very well presented on ProAudio.de here.