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Old 28th January 2007, 13:13   #1
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Default Strange query

hi guys , i was thinking whether if i cud get a HU with 2 pre outs ,a nd install a 800w woofer without any amplifier and all the stock speakers in my OHC , would it be better? or is it a must to get an amplifier with every subwoofer.
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Old 28th January 2007, 15:28   #2
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you need an amp for a woofer, otherwise buying a woofer is a waste of money.
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Old 28th January 2007, 16:05   #3
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unless its an active sub.. active subs arent too good anyway.
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Old 28th January 2007, 18:37   #4
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Hello!! Whether it is a 2 pre out or 10 pre outs, you can't do that!!
Never ever a SUB can be powered by the pre-am outputs from a HU unless there's some amplifying between.
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Old 28th January 2007, 20:52   #5
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zak! some pio HU's can but only 8inch subs or smaller... read a post by an audio guru here
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Old 28th January 2007, 22:46   #6
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Quote:
Originally Posted by jkdas View Post
zak! some pio HU's can but only 8inch subs or smaller... read a post by an audio guru here
A good pair of 6X9s will produce better bass connected directly to the head rather than preouts to however small sub it is.
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Old 28th January 2007, 23:38   #7
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thanks guys, u made it clear to me.i learnt a very good lesson tht no sub can ever be powered by the HU , without an Amp.
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Old 29th January 2007, 03:57   #8
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Quote:
Originally Posted by sankeerthreddy View Post
thanks guys, u made it clear to me.i learnt a very good lesson tht no sub can ever be powered by the HU , without an Amp.
For purely academic purposes -

I remember a discussion in the ICE section where there was a mention of a HU which had an inbuilt amp specifically for the subwoofers as well. A class D amp if i am not mistaken.... i tried looking buy could not find the link....maybe some regular ICErs can help you. I know Navin was part of that discussion.

cya
R

Last edited by Rehaan : 29th January 2007 at 03:59.
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Old 29th January 2007, 05:02   #9
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Quote:
Originally Posted by jkdas View Post
zak! some pio HU's can but only 8inch subs or smaller... read a post by an audio guru here
NO!!! pre-outs cannot power a SUB.
Yes, speaker outputs from the HU may power an 8incher or a 6"!!
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Old 29th January 2007, 08:40   #10
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rehaan and speedzak , can u guys tell me the HU with a built in Amp.
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Old 29th January 2007, 09:14   #11
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Quote:
Originally Posted by speedzak View Post
NO!!! pre-outs cannot power a SUB.
Exactly. They are Pre-Amplifier outs, so the output would be unamplified, even by the HU's internal amp.

I do remember a discussion about a Pio HU (6850? 6750?) that can power a very small sub from the rear channels of the HU. But I guess all that is just marketing stuff. No sub can be powered even close to "well enough" by a regular HU's internal amp.
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Old 29th January 2007, 11:40   #12
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Well even My HU(Pio 5750) has the option where in the rear two channels can be used to power a small sub. Even otherwise it has options which can convert the existing 6X9s into subs as in its gives only low frequencies through the rear & they do give a pretty decent bass
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Old 29th January 2007, 15:51   #13
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Quote:
Originally Posted by Rehaan View Post
... I know Navin was part of that discussion.
I remember this the HU was a Panasonic that claimed to put out 60W rms/ch but I have no idea where to find it. I have not heard this HU but someone else had put up a link to the advert that made that claim. I dont think this HU is available in India and that might be the reason why the thread died an un-eventful death.
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Old 30th January 2007, 14:19   #14
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No, Rehaan is correct. I clearly remember a Pioneer HU that could be used to drive a small subwoofer.
It was a useless proposition and AFAIK pioneer does not make this anymore.
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Old 30th January 2007, 18:44   #15
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Sankeerthareddy, you cannot drive four speakers AND a sub from a head unit. But you can do two speakers plus a sub. The sub will get low power, so no point using a 800W sub etc. Even this is not run off the pre-outs. The pre-outs cannot drive a speaker also, let alone a sub. The sub has to be driven off select leads of the rear speaker connection wires.

Here is the thread that I think people are referring. The relevant discussion starts at the bottom of the page and continues to the next one.
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