I have the REGA OSIRIS integrated amp and it’s stablemate REGA ISIS VALVE cdp/dac
My experience:
- INITIAL RUN-IN FROM NEW: ~ 300 hrs for the first 90%. Progressive small steps after that. ( NOTE: this is an ad-hoc timeline with a series of steps and plateaus …)
- DAILY USE: I first warm them up for a minimum of 2-3 hrs to get the max performance quotient. It’s not a linear curve timeline,…. patience …..
I’ve not seen any need to leave it on 24/7 .
Your disappointment with your midrange and indicated 85% threshold on performance : I’ll take a swing here and guesstimate two things:
Your current power cord and the house power line may be lacking
(1);. A dedicated 20A armoured cable line is begging IMO.
(2) I upgraded my PCs to CARDAS CLEAR / CARDAS CLEAR REFLECTION….. immediate step up in dynamics, slam overall and more presence in the midrange
Your current speakers may no longer be an optimal match to the new integrated amp choice. (System synergy matters … big-time …..)
REGA electronics can develop a bespoke and very special, sweet, and ethereal system synergy with certain limited speaker brands… all British .
My recommendations for the top synergy matches: REGA’s own and HARBETH ( at two different price points )
I have both .
At the lower budget point: the matching of an all-REGA system is a REGA top-match at its pricepoint ( the current REGA RX models.., well worth an audition as a litmus test)