Hi PP
Yes it is (but not before sending another email to Cyrus, more on that on a separate thread).
I have a day off so today I am comparing the amplifiers with each other. No lengthy plugging in/unplugging. Each one literally connected for perhaps 15 mins in quick succession after warming them all up for maybe an hour prior.
I simply compared them on a few reference tracks through Tidal Hifi and BBC Radio spoken word through their respective apps. - Having owned all the amplifiers except the Cyrus for some time I kinda know what they sound like ... . I also briefly switched in the Quad standmounts.
Source; CCA through amplifiers internal DAC's as well as direct to AUX.
Speakers; Mission 752 Freedom and Quad 11L Classic
So, very brief without going into specs etc. ... all that is available online;
Arcam SA20; Punchy with a round full bass/lower mids and good impact. Very clear mids/highs. A tad too bright for me in default flat so I turned the treble down a couple of notches. In summary, powerful, warm (and bright). very good detail. Engaging. Superbly built. Display not as nice as the one of the Hegel. Good Soundstage front to back. Average wide. Goes loud effortlessly but watch that bass. No problem if tone controls are used. The best built in DAC of all integrated's here on paper (ESS 9038 K2M)
Arcam SA20
Hegel H95: Controlled and a perceived flat frequency response. Nothing dominates. Bass is strong if there is some and not if not. Better low frequency control, more solid, slightly more forward mids than the Arcam. Not quite as punchy or forward sounding as the Arcam (but not far off) but it does control difficult speakers slightly better. Highs are just right to my ears. Rated at 60 watts/ch but sounding like more at higher volume. Quite a large power supply for size and power rating. - Very nicely built. Good transparency front to back, Average wide. Perhaps not quite a bargain at its full RRP (although I believe Hegel kept the price to roughly the same over the years where others have gone up hundreds!). Superb as a s/h find (as is the H90 which I had previously).
Hegel H95
Audiolab 6000A: Balanced, smooth. Not as powerful or quite as punchy as the Arcam nor quite as controlled in the bass or outright detailed as the Hegel. Nothing stands out in a bad way. Soundstage is very wide and average to good front to back. Although only rated at 50w/channel it can drive speakers to very high volume without changing its sound signature (ie getting bright and loose in the bass, within it's limitations compared to the Hegel). This is due to a substantial power supply with 60'000 uf of supply capacitance and a decent torroidal transformer. A grown up sound and a bargain for the money. Lacks the pinpoint imaging of the Hegel but is not that far off. An amp you can relax in to. May not impress compared to more bombastic products in a demonstration but all the better for it in the long run. Build is superb for the money.
Audiolab 6000A
Cyrus ONE Cast; Fun. Reasonably balanced with a full, driving bass similar to the Arcam but not quite as controlled as the Hegel. Mids are very clear and velvety and highs slightly toned down (but still very clear), similar to the Audiolab but not quite as resolved as the Arcams. Good rythm, very engaging without fatigue. Build is average/ok and interaction on the amplifier itself not as tactile/nice as the others but no issue as remote is used most of the time. SID (automatic impedance sensing) is cool and the front lights (once dimmed down) look very smart, as does the amp itself. Bargain at its current (discounted) price. Although this is classified as a Class D amplifier it has a substantial linear powersupply with heavy torroid and a 750W maximum power rating at the wall. (is this why it sounds so good?). - It is rated at 100w/ch at 6 ohm but this is at 0.1 THD whereas many other rate their products at 1%. To all intent and purpose this is a hundred watter, almost doubling into 4ohm, restricted only by the protection system into lower loads.
Cyrus ONE Cast
So, there you have it, judged by my own (large and ageing) ears. I've dabbled in Hifi many decades and think I know what to listen out for but that may well differ from what you value.
Everything above is influenced by source and speakers too so take it with a pinch of salt.
I have not tested the Headphone outs (yet) but I believe all the amps have dedicated circuits for that though I may be wrong there.
Thanks guys. Let me know if you need to know anything else.