Originally Posted by purrin
That was certainly a design consideration of the 2A3mk4 and 4-45: better performance with orthos. Still, the 4-45 is less powerful (it's still a few watts) and has higher output impedance than some of those monster solid-state amps. With traditional dynamic headphones, especially those with higher nominal impedance, it's hands down 4-45. With orthos, it can still go either way between full tubes or solid-state (or hybrid with solid-state output stage) with each bringing something different to the table. However, the 4-45 does sort of swing things more in favor of tubes, at least on an overall basis, this according to my preferences.
The difference between the 4-45 production and the 445 proto are the transformers. The proto uses Lundahl OPTs. The production uses custom Cinemags. The production 4-45 is better sounding.
Well, thanks Purrin, now I am convinced, and... I just sent to Cutrus my order form for a 4-45 "in a BA case"
But, with "higher output impedance than some of those monster solid-state amps" as you said, is the 4-45 still Super-OK with some very low impedance (around 25 ohms) headphones like the Fostex TH-900 for example ?
--> Please, could you provide me ( PM if you prefer) with a list of very few headphone that you believe are particularly good with the 4-45 ? Headphones which offer exceptional synergy with the 4-45.
( I have already a TH-900; an AlphaDOG and a Roxane IEM, and now I want to get a fully-open cam: I am considering the LCD-X that is said to pair very well with my Chord HUGO Portable DAC/AMP.)
Edited by bmichels - 5/4/14 at 4:42am