One of the best sounding cinema systems I have ever heard for a smaller room (only about 14 feet square) was at a Meridian dealer and it consisted of 4 3200s with a 3300 centre BUT with a DSW subwoofer so the other speakers were all designated small and did not have to handle much bass.

If you do not have a sub (how do you designate your existing speakers?) then I think you will be disappointed in going as small as a DSP33.

Cinema/Music: Trinnov Altitude32 8-16,218,Cloud 4 channel, Marantz UD5007,DSP5200SE(2+C),DSP3300(4),DSW(2),271,MShort Ceilings,AppleTV 4K
TV: Marantz SR7013 Wharfedale Diamond 9x4+Celestion(C)
Music: Roon,i7NUC8gen,QNAP TS253A, Sony Scala, MS200, Garrard DDQ650,Wharfedale Diamond 12.3
Kitchen: AD88 (bluetooth via i80).