No worries here ….. it’s is a very beefy, muscular, yet refined and holistic performer.
Go read the articles highlighting its premium internal components and superior build quality in a dual-mono design. Each channel has its own dedicated custom-made toroid transformer and the quad of Sanken 200W output transistors per channel means this 58 lb behemoth has no problems driving any kind of load.
” …. You know what every great system needs to make it exceptional? Great bass response. It’s not enough to have a system capable of reaching down to 30 Hz. It requires an amplifier capable of controlling the drivers. It’s not wattage that allows an amplifier great control of the low-end. It’s current, and lots of it.
In most cases, you can recognize an amplifier with ample current delivery by looking at its wattage output as impedance decreases. A great amplifier will double down, so 100 watts at 8 ohms becomes 200 at 4 ohms. There are exceptions to this rule, but it is a great rule of thumb.
The Osiris is one of these exceptions. While it doesn’t double down, it has the current. This is provided by those four Sanken output transistors per channel. They insure that no speaker is too hard to drive.…”
i listen at 8 - 9 o’clock on the volume dial to fully fill a large room for my relatively lowly and inefficient 85db HARBETH speakers.. At 11 o’clock it was a very brief clean and fun experiment but requiring a quick volume scale back to “normal” listening levels .
It has most Impressive power reserves …full,stop. WPC in isolation is meaningless : it’s the very high current grunt ( think amperes,,,,) that provides the oodles of headroom .