Strange query

sankeerthreddy · 28th January 2007, 13:13

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.

blueraven316 · 28th January 2007, 15:28

you need an amp for a woofer, otherwise buying a woofer is a waste of money.

Akshay1234 · 28th January 2007, 16:05

unless its an active sub.. active subs arent too good anyway.

speedzak · 28th January 2007, 18:37

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.

jkdas · 28th January 2007, 20:52

zak! some pio HU's can but only 8inch subs or smaller... read a post by an audio guru here

blueraven316 · 28th January 2007, 22:46

Quote:

Originally Posted by jkdas

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.

sankeerthreddy · 28th January 2007, 23:38

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.

Rehaan · 29th January 2007, 03:57

Quote:

Originally Posted by sankeerthreddy

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

speedzak · 29th January 2007, 05:02

Quote:

Originally Posted by jkdas

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"!!

sankeerthreddy · 29th January 2007, 08:40

rehaan and speedzak , can u guys tell me the HU with a built in Amp.

hydrashok · 29th January 2007, 09:14

Quote:

Originally Posted by speedzak

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.

Technocrat · 29th January 2007, 11:40

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

navin · 29th January 2007, 15:51

Quote:

Originally Posted by Rehaan

... 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.

Sam Kapasi · 30th January 2007, 14:19

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.

Bass&Trouble · 30th January 2007, 18:44

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.

28th January 2007, 13:13	#1
sankeerthreddy BHPian Join Date: Oct 2005 Location: hyderabad Posts: 79 Thanked: 0 Times	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.
	() Thanks

28th January 2007, 15:28	#2
blueraven316 Senior - BHPian Join Date: May 2006 Location: Bangalore Posts: 1,110 Thanked: 19 Times View My Garage	you need an amp for a woofer, otherwise buying a woofer is a waste of money.
	() Thanks

28th January 2007, 16:05	#3
Akshay1234 Team-BHP Support Join Date: Dec 2006 Location: Mumbai Posts: 10,265 Thanked: 12,317 Times	unless its an active sub.. active subs arent too good anyway.
	() Thanks

28th January 2007, 18:37	#4
speedzak BANNED Join Date: Mar 2006 Location: India Posts: 4,347 Thanked: 27 Times	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.
	() Thanks

28th January 2007, 20:52	#5
jkdas Senior - BHPian Join Date: Sep 2005 Location: Thiruvananthapu Posts: 9,687 Thanked: 1,492 Times View My Garage	zak! some pio HU's can but only 8inch subs or smaller... read a post by an audio guru here
	() Thanks

28th January 2007, 23:38	#7
sankeerthreddy BHPian Join Date: Oct 2005 Location: hyderabad Posts: 79 Thanked: 0 Times	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.
	() Thanks

29th January 2007, 08:40	#10
sankeerthreddy BHPian Join Date: Oct 2005 Location: hyderabad Posts: 79 Thanked: 0 Times	rehaan and speedzak , can u guys tell me the HU with a built in Amp.
	() Thanks

29th January 2007, 11:40	#12
Technocrat Senior - BHPian Join Date: Feb 2004 Location: GTA Posts: 14,813 Thanked: 2,700 Times	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
	() Thanks

30th January 2007, 14:19	#14
Sam Kapasi Distinguished - BHPian Join Date: Jul 2005 Location: Mumbai (but wat Posts: 6,997 Thanked: 2,378 Times View My Garage	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.
	() Thanks

30th January 2007, 18:44	#15
Bass&Trouble Senior - BHPian Join Date: Mar 2006 Location: Bombay Posts: 2,754 Thanked: 124 Times	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.
	() Thanks