Hello bass players! I have a question for those of you who are engineer types. I'm attempting to calculate the average difference in SPL between a 100 watt amplifier into an 8 ohm cab and the same amp into a 2 ohm load. I know that the dB in relation to power is a logarithmic relationship and I have a book that goes through the formula's, but it's confusing. Using the book, it seems that I have to convert my units to volts in order to get to dB. But I get confused between dBu, dBm, dBV. . I've come up with the voltage for each scenario (8 ohms gets 28 volts and some change, 2 ohm gets half of that). I used OHMS LAW to get the voltage but now I'm stuck. I understand that I would be coming up with an approximation due to all the other "real world" factors. I just want to get a grip on the conversions. If anyone could help me out, I'd appreciate it.