So, that's why you have the earplugs in?
No doubt the earplugs must be prerequisite to enhance the non-distraction to derive pertinant formulae such as shown:
Inversely proportional, (weight of amp) ≈ (k/(age)) ...
To establish paramaters by which a musician may derive a basis upon which to conduct endeavors of music such that the variable (age) may not be restricitve or prohitibitive on the basis of known guitar amplification equipment constants, such as (available wattage per lb. of amplification weight), or w/A.
Actually, the amp I was interested in, but probaly won't get has wheels on it, but then again its getting it into and out of the car, & up the steps into the pub that might just be the clincher on going for a 40 watt, or so amp.
-Craig