Could it be 4ohm?

[JL12W7INAGS300 10+ year member]

I am in the process of installing a new head unit for my 1998 Lexus GS300. The headunit is the JVC KD-AVX2. A few weeks ago I took of one of the rear door panels to see how many ohms the speaker is, and it said 4ohm. Since that meant I could use the headunit to amp to power it I ordered the head unit (I will upgrade to a new four channel amp and componets in the next month or so)

so my question is...

yesterday I took the front door panel off and the speaker said 2ohm. But... it looks like the tweeter is wired into the speaker somehow. I don't know if there is a cross over or not.. the tweeter wires plug into the housing that the speaker is in. So could it be that the tweeter is wired in series (or is it parallel?) to the stock speaker making the stock speaker 2ohm? Or should I just get a DMM to test it out? Thanks!

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[Prowler573 5,000+ posts]

yesterday I took the front door panel off and the speaker said 2ohm. But... it looks like the tweeter is wired into the speaker somehow. I don't know if there is a cross over or not.. the tweeter wires plug into the housing that the speaker is in. So could it be that the tweeter is wired in series (or is it parallel?) to the stock speaker making the stock speaker 2ohm? Or should I just get a DMM to test it out? Thanks!

There is likely no "crossover" as you would have like for a component set present but more likely simply a resistor that serves as a HP choke for the tweeter inline with the signal wire. It is most likely wired in parallel with the other driver with both the tweeter and the midwoofer being 2 Ohm drivers which makes a 4Ohm load wired parallel.
The safest best, however, would be to get a DMM out and check for yourself.

 

[JL12W7INAGS300 10+ year member]

It is most likely wired in parallel with the other driver with both the tweeter and the midwoofer being 2 Ohm drivers which makes a 4Ohm load wired parallel.

Does that mean that I could hook up the front speakers and still have the tweeters? With the DMM would I test how many ohms are at the tweeter or how many ohms are at the stock speaker. Thanks for the real quick reply

 

[JL12W7INAGS300 10+ year member]

hmm.. so why would they make the front two speakers 2ohm and the back two 4ohm? that doesn't make much sence to me.... grrr

anyone else have some iders?

 

[JL12W7INAGS300 10+ year member]

If I bought a really cheap four channel amp would that work for all of my stock speakers until I upgrade?

but I would much rather use the amp in the head unit for now.. grrrr

 

[Prowler573 5,000+ posts]

it would be a capacitor in series with the tweeter....

Ding, ding, ding! You're right. Capacitor is exactly what I meant.

if you wire in parallel, you halve the impedance... 2 ohm + 2 ohm in parallel = 1 ohm....

Right again - I'm typing faster than I am thinking today (a common affliction sadly) and I meant to say wired in series to make a 4 ohm load.

 

[Prowler573 5,000+ posts]

yeah, I assumed you werent thinking AT ALL, seeing as EVERYTHING you said was wrong //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif lol

My mind is centered on a young lady (who I will assume hasn't gotten out of bed yet) in Marleston. I really should proof what I type before I click the 'submit reply' button.

just spend the money on a half decent amp, you'll use it when you upgrade the cabin speakers anyway, don't be a tightass!!!

he has said repeatedly that he has no desire to upgrade the OEM speakers (though I haven't any idea why) so I think this suggestion is likely falling on deaf ears.

 

[JL12W7INAGS300 10+ year member]

So with the tweeter hooked up could the amp be seeing a 4ohm load?

 

[Prowler573 5,000+ posts]

If the front tweeter and midwoofer are both 2 Ohm drivers connected in series then yes, the internal HU amp would be seeing a 4 Ohm load.

But without checking it for myself I have no way of knowing for certain if this is the case with your particular car.

 

[JL12W7INAGS300 10+ year member]

Is there a way you could check it yourself with out a DMM? my car is a 1998 Lexus GS300 with the Pioneer sound system (not the nakamichi or the mark levinson)

 

[headless 10+ year member]

No, there isn't. Get a DMM and check your shit, then you'll know. YOU NEED ONE ANYWAY. Then go buy a 4channel amp for 100$ and stop worrying about making your deck do something it wasn't designed for. Jeez, i've got some old 2ch punch amps i'd practically give you if it would stop you asking the same questions in 4 threads.

 

[Ingleside 10+ year member]

jesus christ!

dude, hook the shit up. i already told you how to do it.

check the wires w/ a dmm and hook it up.

 

[JL12W7INAGS300 10+ year member]

My head unit will be comming in on Monday.... I will get a DMM soon and maybe a 4 channel amp, just don't really want to shell out the dough/rewire a bunch of shit to put in the amp.

 

[JL12W7INAGS300 10+ year member]

Ingle, you PM'd me and I tried to PM you back but your box is full....

The factory amp is pretty easy to access, it is behind the glove comparment.

 

[headless 10+ year member]

...Why not just run the outputs from your new deck to that?