I would like to come across a good comprehensive web-site for steel equivalent cross-referance. I am working with cold rolled steel box section, mainly 40x40x4 mm and it is very confusing to visit various sites that give a biased list of standards. My background is not mechanical so I can spend...
I have to connect loudspeakers in a seater coach. Each double seat has an 8 ohm 20W speaker. There are 7 such speakers on each side,each side being connected into an amplifier with 20 per channel, 4 ohms impedance.
There are many combinations of series/parallel arrangements to get close to 4...
