Originally Posted by sniperviper21
who has the degree in Electronics here?
Me, thats who.
let's have a look at what you said.
2 8Ohm speakers in parallel give a total (nominal) impedance of 4Ohms. (FACT)
This is too little to get the full sound (ASSUMPTION -not necessarily fact).
that'd rather depend on the amplifier. if his amplifier is designed to drive a 4 ohm load then it'll work best when the load is 4 ohms (1 4 ohm speaker, 2 8 ohm speakers, 4 16 ohm speakers etc).. if it's designed to drive 8 ohms then it'll work best at 8 ohms as you asserted above.
Sorry I know you have all explained this to me before but I still don't understand. Ok, the current speaker situation is 3x 8 Ohm surround speakers connected to my amp's 3 surround sockets (these can be ignored for now), but then my 2 Sony XB80AV speakers and my 2 ProSound 200W speakers. These 4 larger speakers are connected to the amplifier's stereo sockets (2 speakers per socket). I know this is overloaded but I can't afford a new amp. Each speaker says on the back of it that it is 8 Ohms but I have no idea is this is per speaker or per set of 2. The amplifer says it can take 8-16ohms in these sockets and doesnt appear to be getting hot even at full volume, but I think the speakers are greatly underpowered, I'm sure the amp is only 100W per channel. So I was wondering if anyone could help me work out the resistance and how badly underpowered the speakers are? Thanks
the rated impedance is per enclosure written on the back.
if the speaker says 8 ohms, then that cabinet/box is 8 ohms, whether that's 2 16 ohm speakers in parallel, or 2 4 ohm speakers in series, of even 2 8 ohm speakers wired through a cross over to split up the frequencies so that the apparent impedance to a given frequency is 8 ohms.
if it says 8 ohms on the back of a box, that box is 8 ohms, when it's wired as the manufacturer first wired it with the original speaker, (if you've changed the internals about then it'll be as you;re re-wired it), but we'll assume that you haven't.
I'd suggest that if your amp can drive 8 - 16 ohms that you either only wire one of the set of speakers into the sockets on the back.
you wire the two 8 ohm speakers in series to make 16 ohms rather than in parallel to give 4 ohms.
the amp might not get hot, there might be some thermal protection circuits working and limiting the output and that might be why it's not as loud as you expect it to be.
does the amp sound better with only 2 speakers, rather than loading it with 4 speakers wired up to give a 4 ohm load?