Yes..a full spec sheet is an absolute must..There is a claim that the 12″ VR is 100. SPL but really cannot confirm that. Because on that blog there is no proof. So there is no way of knowing what frequency ranges are or the SPL’s are..buying a speaker with a 94 SPL for guitar is a bad choice.. 97. To 101. is what you want..In order to not waste money on less desirable speakers the customer needs these spec charts..SO PLEASE MAKE THEM AVAILABLE !