There are three audible tail-only impulse respnses to audition in mono and binaurally.  They all have the same energy/time decay.  One uses conventional pseudo-random noise.  The images-based ones follow the Cremer-type image locations for a very simplified Musikvereinssaal; the two-level one (marked "Stage" here) limits the images to floor level and ceiling level as in a real concert hall.  They are subtley different, but the "Stage" option is physically the most realistic and is the most natural-sounding one I think.