Speaker upgrade

Looking for advice on new speakers for use in a 18' x 30' room. Listen to female vocals, classic rock. Current system includes newly acquired Mac 501 mono blocks, Musical Fidelity 308 CD player and 308 preamp. Speakers are Thiel 2.3. Cables are Harmonic Tech.

Anyone heard the VonSchwiekert VR4 SR, also looking forward to the Thiel 3.7's. Looking for more bass and room filling impact without boom. Appreciate your input.