I too heard the Concertos amped by a Glow 5-Watt amp and found their sound to be very pleasant. They were sweet and musical but lacked drive in the setup I heard them in.
I've been meaning to go back to the dealer's place that I heard them out to give a listen with my own amp as I heard a lot of potential and am looking for a high efficiency successor for my Abbys, but I put that on hold to check out the new Zus.
I've been meaning to go back to the dealer's place that I heard them out to give a listen with my own amp as I heard a lot of potential and am looking for a high efficiency successor for my Abbys, but I put that on hold to check out the new Zus.