Thread: Tweater,Midrange,Midbase + a Sub!

Yes you could hook up both front a back speakers as long as you have passive crossovers on the front and rear sets of speakers separating frequencies for the tweeter, midrange, and midbass. With passive crossovers, your amp will effectively see 4 ohms at each channel.

Originally Posted by ijwalla

Thanks, for your reply, as you can tell I dont know much about this.
Where would I buy a passive crossover device?

Usually the crossovers are designed specifically for the speakers, but since I am assuming these are stock speakres, you have no idea what the specs are let alone any idea on how to design the crossovers.

I am a big fan of www.partsexpress.com
For your rear speakers you need a 2-way. See here.
for your fronts you need a 3-way. See here.

Another option is to look around on ebay and buy a pair of component speakers and use the crossovers from those instead. Plus then you have soem backup speakers if your stock ones can't handle the power.

From my understanding, it is bad to have lower ohm speakers than the stated minimum for the amp (4 ohms on mine), something about impedance matching. Having a highter ohm speaker is ok, lower ohms speaker is bad, right? Or is it the other way around?

You do not want to go lower than what your amp is rated for. 4 ohms is typical, most car audio amps will allow 2 ohms in stereo mode but it increases heat and distortion because your amp has to work harder. Look at it like this, the closer you get to 0 ohms (a piece of wire), that is like a dead short across your amp.

I was thinking, I could use the 2 front Tweeters @ 8ohms plus the 2 back midrange speakers @ 8 ohms.

That would sound weird to only have your front tweeters playing and your rear midranges playing.

The passive crossovers help to keep your amp seeing 8 ohms from each of your front and rear speakers by separating the frequencies going to each speaker. THen when you connect your front speaker in parallel with your rear speakers on your amp 8 and 8 ohms now becomes 4 ohms. (See Ohm's law)

Just be careful if you are using your stock speakers. They might not be able to handle the power output from your amp. Go easy when adjusting the gains on the amp.

You can use all of them. That's what I am trying to tell you.

I suggest doing a little bit of research because I would be here all day explaining.

Things to search for
Passive crossover
2-way passive crossover
3-way passive crossover

Wikipedia or even google will give you tons of results. I was looking for a good diagram but this all I found at the moment.

http://www.trueaudio.com/st_xov_1.htm

Here's another diagram I drew up quickly.

He'll get a 2Ohm load, that way.... I hope the amp can handle that.... Also he won't be able to tune the volue of front and rear separatly....

Not if they are 8 ohm speakers, he gets 4 ohms. EIther way the Sony amp SHOULD be able to handle it.

Good point I forgot to mention, you will not be able to control front and rear separately.

Clearly I(m missing something.... Good thing I'm building an active system