Dear hifirose support,
As far as i have view the back of the RA280, unlike the 180, there is no any way to add a preamp in front, to operate it in pure poweramp mode. I wonder if the preamp section of the 280 was actually passive?! If so, adding my favourite tube preamp in front wasn’t be an issue?! Could i do it in this way so as to let them pre & power separated?
Many thanks!
…No feedback?
Forget it…
Sorry for the late reply.
Unlike the RA180, the RA280 does not have a separate Bypass mode function.
The RA280 also has a Bypass switch, but it cannot fix the volume to max like the RA180.
In other words, it is different from operating the RA280 like a normal power amplifier.
If you activate the Bypass switch on the RA280, the EQ is not applied, but it passes through the preamp.