I love mis-information. The Sugden A21SE is rated and delivers 30wpc Class A. The A21a is its smaller brother and yes delivers 20wpc. I own the pairing of the Sudgen integrated and CD 21SE. The integrated is quite good reproducing well female vocal, acoustic piano and acoustic bass. It is lightening quick and makes nearly all other amps seem lethargic and veiled.
I've owned a plethra of high quality amps to include Onix, Luxman, GAS and VTL. I've also ran Reference 3A Integrale, English Mordaunt-Short and Dynaudio with the Sugden.
My current system as it stands is the aforementioned using an Audio Zone Blackgates upgraded DAC, with Poiema III digital cable, MAC silver/copper interconnects, LAT International speaker cables, Analysis Plus power cables all feeding Coincident UHS TRS Triumph monitors on Sound Organization massed stands.
The CD player is very respectable, however I would not put it up against a higher end transport only. I've owned a highly modified Parasound/CEC transport which to this day outperforms all that I've heard to include the Wadias. I no longer own it because it had difficulty with burned CDs and my wife did not like the top loader drawer and heavy puck.
The Coincidents are 94 db efficiency so in a smaller room the volume does not ever travel above 9:00 o'clock. Should power nearly anything you would want to pair with it unless you grab electrostatics or some very large floor stander.
Hope this has helped and dispelled any misunderstandings.