View Full Version : replacing speakers with 8 ohm in a 2 way component set

01-24-2010, 11:30 PM
i have a set of alpine components with crossover
they are 4 ohm

according to a calculator on the12volt.com:
when i hook up 2 speakers 4 ohm each to the crossover(woofer and tweeter)
the crossover point would be around 8500hz
since most of the crossovers use the 4.75mf capacitor.

so if i hook up an 8 ohm woofer and an 8 ohm mid given same crossover specs
the crossover point would drop to 4200.
am i correct?

01-24-2010, 11:40 PM
i also have another pair of infinity crossovers
can someone decypher it for me?
it has
1 capacitor
3 resistors
5w1Ωj 5w2Ωj 5w3Ωj
2 coils
0.4mh 0.2mh

01-25-2010, 03:27 AM
btw, how are typical car components set up?
theres some pages saying that they use a hybrid 1st/2nd order crossover
and 4 ohm woofer with 8 ohm tweeter.
is that a fact?

01-27-2010, 03:07 AM
can anyone help before i blow my speakers or the ampor my ears?

01-27-2010, 12:39 PM
lol how would you blow your speakers? your fine, hook them up.

01-27-2010, 07:43 PM
if the crossover point for mids is too low it will blow them up.
and if the crossover point for woofer is too high it will sound like sht.

01-28-2010, 01:25 AM
what are you even talking about. what speakers did you buy. give us a link.

01-28-2010, 01:00 PM
crossovers are from alpine sps-171a
woofers are stryke audio 7" 8ohm
mids are factory BMW 8ohm
tweets are infinity emit( which probably will be replaced because they re damaged (im not worried about tweets for now)

01-28-2010, 02:25 PM
why would you leave factor midbass? i understand is a bmw but even then its nothing compare to a cheap set of midbass.

and so what is you quesiton that youre worried about. hook the midbass to the crossovers and tweeters and go. ive never heard of any problems with ohmage befor.

01-28-2010, 04:54 PM
look man no offence but u dont seem to know what im asking.

im not asking you to tell me how i can replace something.
this is what i got and i want to make it work. im asking a specific question

its not a bmw btw its 2 door integra with mids mounted in place of tweeters ( bmw mids are because they are only ones that fit without making custom pods)

im asking if the typical 2 way component setup uses an 8 ohm tweeter or 4 ohm tweeter

01-28-2010, 05:04 PM
Depends on the design of the crossover in the system itself. there are a few floating around in some vehicles that are 6 ohm. According to the calculator your xover point in your first post is correct. :)

01-28-2010, 05:06 PM
But your xover point being to low won't blow anything up persay. You just run the risk of bottoming out the mids. That can still be a problem with those alpine or infinity crossovers. THey aren't band pass, they are simple two way crossover. Everything above the xover point goes to tweeter, everything below to the mid :)

01-29-2010, 01:18 AM
i know my infinity and most other 2 way passives are corssed at 3.5khz. the hertz hsk is 3.2khz iirc. I'm sure it might change the slope maybe not enough to be audible.