audiiofilio123 - two thoughts come to mind. A: you like more bass than the CS.5 delivers or B: something is wrong.
Your room is appropriately sized and I'll presume your equipment is up to the task, with the caveat that the CS.5 has a low impedance requiring an amp that is comfortable driving 4 ohms. Insufficient current delivery can manifest as bass-starved.
Thiel speakers are often considered bass-lean. Their tuning has a Quality Factor of .707 which we think provides the 'best' compromise between bass quantity and quality. However, the CS.5's target market was Home Theater and its Q target was '1' - providing a 3dB hump before roll-off. So, it has more apparent bass than Thiel's music models.
You might play the same-channel or combined mono into each speaker separately to ascertain they both have the same bass output. Let us know what you learn. That speaker punches way over its weight!
