When I was younger, I used to play a fair bit with car speakers and connect them to my home Pioneer hifi separates. I blew a couple of speakers in this way (as you do) and when I discussed it with an installer a while later was told that this was due to the impedance on the car speakers being 4 ohm and the house speakers being 8 Ohm. He suggested 'wiring the speakers as a pair' in parallel or series - I forget which, but basically I think he meant splitting the source wire into two sources and then feed to a speaker each one. This should in theory bring the total impedance to 8Ohm. Now I am all grown up (36) I am looking to install a home AV system around several rooms in the house and am wondering whether or not I could use something like this to utilise car speakers in the ceiling in place of very expensive house speakers which are fitted into the roof (they all seem to be over £100 \ £150 a pair!!) I'd like some common sense advice here please, is there a way I can wire a pair of car speakers to provide some sound around the house (cheaply) or do I HAVE to go with dedicated 8Ohm house speakers for the job. Aside from anything else, it seems as though there is an awful lot more choice when it comes to car speakers than there is for in-ceiling house speakers. Is it bad for the speakers, or amp or what? I'm looking for background to medium type noise levels etc, I'm not turning the house into a nightclub!! Thanks in advance guys!! Jag
If you wire the speakers as a pair in parallel; (For two 4ohms car speakers) 1/R=1/4 + 1/4 1/R=2/4=1/2 R=2 ohms (the resistance value you'll get) (don't even think of trying it!) in serial; R=4+4 R=8 ohms (this mostly fits to home amplifiers, however, they provide 6ohms as well) I recommend that you use reasonable 8ohms speakers for the home theater amplifier you have. Despite the fact that the impedance value fits to 8ohms when you wire two car speakers as a pair in serial, this type of connection will tire your amp as well as the capacitors of the car speakers. Furthermore, you can get unwanted peak sounds from car speakers.
Question: Although you can get good sound with the car stereo speakers using EQ (and maybe a notch filter or two in the crossover), will you get good dispersion? Car speakers are designed to operate in an enclosed air space in front of the cone (the car's cabin), while the back air enclosure is either very limited in size (a door, for example) or VERY spacious (a trunk). Those considerations make me wonder if the dispersion will be less than optimal.
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