I'm building a boombox using some old parts from a old boombox from 1983 that went kaput, but still had many good components in it. The units only audio source will be a stereo line in though. The speakers I removed from the original boombox are JVC 8 ohm 15W main speakers and JVC 8 ohm 15W tweeters. I've been looking for a speaker amp circuit to use and I found this from a local store: http://sayalhobbies.com/CatalogDetail.asp?link=205537 They list the specifications as this: So according to this using 8 Ohm speakers will result in 12W of sound per channel. Since the speakers are 15W they won't blow and I don't need the ultra high volume anyway, however I guess I can't run the main and tweet on the same channel, right? I recall from engineering class that when two resistors are in parallel, their resistance becomes less than the lowest resistor, as calculated by Rtotal = 1/[(1/R1)+(1/R2)+(1/R3)...] So then does this law apply with 8 ohm speakers? Would putting the main and tweet in parallel on the 20W channel be 4 ohms of resistance rather than 16 ohms? If that stereo amp is not suitable for my project, would this one be better? http://sayalhobbies.com/CatalogDetail.asp?link=204270 But with 50W of power would I then be running the risk that if someone turns the volume to 10 that the speakers will blow? I'd rather be too quiet than blowing my speakers. Thanks for the help. EDIT im an idiot. this would be better suited to go in Modding instead of tech support.