2 ohm speaker off HU?
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Joined: Aug 2005
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From: Tampa Bay
2 ohm speaker off HU? I'm looking at these speakers:
KAPPA62.7I
Specifications:
Power Handling, RMS: 75 Watts
Power Handling, Peak: 225 Watts
Sensitivity: 94dB
Frequency Response: 45Hz - 25kHz
Mounting Depth: 2-3/16"
Impedance: 2 Ohms
Can someone who knows about this stuff tell me what I can expect by running a 2 ohm tweet off the 4 ohm HU? There's been discussion about running the 4 ohm 6.5 off the amp, but not vice versa. Thanks a lot!
KAPPA62.7I
Specifications:
Power Handling, RMS: 75 Watts
Power Handling, Peak: 225 Watts
Sensitivity: 94dB
Frequency Response: 45Hz - 25kHz
Mounting Depth: 2-3/16"
Impedance: 2 Ohms
Can someone who knows about this stuff tell me what I can expect by running a 2 ohm tweet off the 4 ohm HU? There's been discussion about running the 4 ohm 6.5 off the amp, but not vice versa. Thanks a lot!
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Joined: Sep 2005
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From: Georgetown, DE
Unfortunately, I have no info on the output capabilities of the head unit. Going from 2 ohm to 4 ohm is no sweat, because your drawing less current from your signal source. Going the other way, you can burn up output transistors pretty fast if they can't handle the extra current.
Other than that, they should be decidedly louder than the stock tweeters were.
Have you looked at the Image Dynamics CXS62's? These components come with a 4 ohm Tweeter and a 2 ohm Midbass.
They are priced at $279 from these guys:
http://www.carmedia1.com/en-us/dept_19.html
Other than that, they should be decidedly louder than the stock tweeters were.
Have you looked at the Image Dynamics CXS62's? These components come with a 4 ohm Tweeter and a 2 ohm Midbass.
They are priced at $279 from these guys:
http://www.carmedia1.com/en-us/dept_19.html
Last edited by HiTechGent; Oct 19, 2005 at 12:26 AM.
I would not recommend hooking a 2 ohm woofer up to the h/u, that is asking for disaster.
In the arrangements that use the h/u channels... they are powering the 4 ohm tweeters. Hooking up a 2 ohm woofer and driving bass is a much different scenario.
It might work for a little bit but I wouldn't do it unless you are looking for a reason to upgrade your deck.
In the arrangements that use the h/u channels... they are powering the 4 ohm tweeters. Hooking up a 2 ohm woofer and driving bass is a much different scenario.
It might work for a little bit but I wouldn't do it unless you are looking for a reason to upgrade your deck.
when you go 2ohm it actually doubles the output power. it causes the source to work twice as hard which causes more heat and wears it out. an amp can handle this for the most part but a HU is not designed to run at this load. i would not recommend it.
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From: Tampa Bay
I must not have been clear, I'm not going to drive a 2 ohm woofer off the 4 ohm HU channel, I wanted to run the 2 ohm tweet off the HU. I guess I don't understand how having a 2 ohm tweet powered off the 4 ohm HU would make the HU work harder?!? Doesn't it put out the same amount of power no matter what the speaker it's trying to push?
if it is a 2 ohm tweeter only then no it wont make that much difference because it will only be playing higher frequencies which doesnt take much power to produce. if you are using the speaker leads off the HU then it doesnt matter what kind of speaker it is you will still be dropping those channels down to a lower ohm rating which a headunit is not really designed to play at anything below 4 ohms. when you run at 2ohms then the source has a higher load on it which caused it to work harder. most good amps at 2ohms doubles its power output a HU wont double but it will have to work a lot harder. but like i said, a set of two ohm tweeters may not hurt anything due to the limited higher frequencies they are designed to reproduce, but they will definitely be loud.
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Teching In
Joined: Jun 2005
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From: Land O Lakes/Tampa, Florida
I actually put a pair of those in my front doors on my 2001 vert.. That exact model infinity kappa 62.7i. They sound great. If you look at the stock door speakers they are 2 ohms from the factory, but get this the rear speakers are 4 ohms. I was a little confused, but after putting the 2 ohm's in front and some 4 ohm's in the rear. It was very easy and sounds a hell of a lot better than the stock speakers. The reason GM put two ohm speakers in the doors was to extract every last amp from the system to give you sound. hope this helps. my email is akania@tampabay.rr.com if you have any questions.
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From: Georgetown, DE
As Todd said, you are still trying to drive 2 ohms with a circuit that normally sees 4 ohms. It does not matter whether the speakers are tweeters or woofers. It still makes the output transistor(s) source twice the current at a given volume control setting. This may or may not cause an immediate failure, but it will shorten the life of the HU.
I'm glad to hear that Sunset has had good luck with these speakers so far. But head unit failure is a risk you take with this set-up.
I'm glad to hear that Sunset has had good luck with these speakers so far. But head unit failure is a risk you take with this set-up.
Originally Posted by HiTechGent
As Todd said, you are still trying to drive 2 ohms with a circuit that normally sees 4 ohms. It does not matter whether the speakers are tweeters or woofers. It still makes the output transistor(s) source twice the current at a given volume control setting. This may or may not cause an immediate failure, but it will shorten the life of the HU.
I'm glad to hear that Sunset has had good luck with these speakers so far. But head unit failure is a risk you take with this set-up.
I'm glad to hear that Sunset has had good luck with these speakers so far. But head unit failure is a risk you take with this set-up.
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Joined: Sep 2005
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From: Georgetown, DE
Originally Posted by Macon
The real answer is what Output IC is in the circuit...what is the HU .. I may have missed the model/mftr. You can probably get away with it although it isn't reccommended. Yea...I'm a tech that lives on the edge. I've made a lot of people mad doing the "impossible". If all else fails grab a fat white 1-2 ohm resistor and slap it in series...it might knock down output a tiny bit but not much...try it...only costs a 1$ or less.
If one of you is willing to send me your HU, I can disect it and analyze the capabilities of it's guts. Then we would know for sure what the HU can and can't do.
Originally Posted by 01 Sunset SS
I actually put a pair of those in my front doors on my 2001 vert.. That exact model infinity kappa 62.7i. They sound great. If you look at the stock door speakers they are 2 ohms from the factory, but get this the rear speakers are 4 ohms. I was a little confused, but after putting the 2 ohm's in front and some 4 ohm's in the rear. It was very easy and sounds a hell of a lot better than the stock speakers. The reason GM put two ohm speakers in the doors was to extract every last amp from the system to give you sound. hope this helps. my email is akania@tampabay.rr.com if you have any questions.
For ALL f-body Monsoon setups, there is not a single one where the h/u drives a 2ohm speaker, tweeter or otherwise.
The only thing the head unit ever drives are the 4 ohm tweeters. H/U power is good enough to make tweeters loud enough to keep up with the basic factory amp. In verts... the H/U actually powers no drivers at all.
In all honesty I would suspect that the amp section of the factory h/u isn't upgraded much if at all from a regular Delco. Most of which use a combination of 4 and 10 ohm speakers, or at max 4 4ohms.
As far as your 2ohm speakers working... if they are real 2 ohm speakers and you are sending a full range signal to them - I would say you are lucky that the h/u is still working. I also suspect if you crank it for an hour or so your CD's are coming out feeling like hotcakes.
However if you are using not driving bass, or the speakers aren't quite 2 ohm... then that might be ok. It's the heavy, sustained power drain of a 2ohm bass load that would kill it, for sure.
I guess in reality a factory h/u isn't that much of a gamble. But it seems like a bad long term plan.
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From: Tampa Bay
Originally Posted by Macon
If all else fails grab a fat white 1-2 ohm resistor and slap it in series...it might knock down output a tiny bit but not much...try it...only costs a 1$ or less.
Originally Posted by FL01SS
What is this? Is it like the "bass blockers" you can get at Best Buy or what? If not, what should I look for and would it make that much of a difference???
Thread Starter
TECH Regular
Joined: Aug 2005
Posts: 445
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From: Tampa Bay
Originally Posted by Macon
The real answer is what Output IC is in the circuit...what is the HU .. I may have missed the model/mftr. You can probably get away with it although it isn't reccommended. Yea...I'm a tech that lives on the edge. I've made a lot of people mad doing the "impossible". If all else fails grab a fat white 1-2 ohm resistor and slap it in series...it might knock down output a tiny bit but not much...try it...only costs a 1$ or less.