Car Audio Advice from the Audio Gurus: Use "Search thread" before posting a new Q!

Sam Kapasi · 9th August 2005, 19:04

Quote:

Originally Posted by navin

good news esp for Sam.....
I will be AWOL from 15th August to 22nd August. Enjoy.

NAHEEE!!!

BTW how exactly is this good news for sam??

Just got back from Himachal, very nice place.

pranil · 9th August 2005, 19:20

Actually this one is for Navin-

I always wanted somebody for this answer
As I understand car batterires are 12 volts and car speakers are 4 ohms . That means max they can draw is 3 amps . This brings us to max 3 x 3 x 4= 36 wats RMS ( I2R rule).

So how does one pump up the sound more than that . and what is the use of having say 50 watt or even 80 watt speakers or 300 watt amplifiers do they actually draw this much.

Ok I know that bigger amps and sound systems have bigger and better capacitors to temporaryt bridge the power peaks but that is not the max capacity

also when U bridge the amplifier ( say for Sub woofer) does it mean it's current capacity is doubled or volatge is doubled -- in other words parrallel or series). I know that in any case the resultant peak power would go up.

navin · 9th August 2005, 19:53

Sam, i figured you like to advise and with me not around you'll have more opportunity.

pranil, this is simple esp. after SMPS became the vogue. Before SMPS we used to use inverters to get AC from DC then use a step up transformer to get higher AC voltage and rectify that to higher DC voltage. This used to cause a lot of heat (and hence energy wasted).

SMPS are far simpler and far more efficient.

When you bridge an amp it can deliver twice the current but it is still limited to the ability of it's power supply so if the amp delivers 3A per channel and 2 channels deliver 6A but the PS is only 5A you will be limited to 5A.

navin · 9th August 2005, 19:59

BTW pranil, is that an Octy L&K you have in your avatar?

nilesh111 · 9th August 2005, 20:35

Guys Just got a soundstream installed in my Swift nad i say it rocks...The car is not powerful enough to handle the sound....It simply starts to vibrate above the half volume ....got thye following

1. RMS 150W 6 " Front Door Compos
2. Back Door 6" 85 W RMS
3. Back Tray 6*9" 120W RMS
4. 360W RMS 4 channel
5. Sony 7810

IT beats just about everything reviewed her...Forget JBL and Sony and BOSS and etc....Just go for it guys...u wont be disappointed.

navin · 9th August 2005, 22:21

I assume you mean a soundstream power amp right? or do you mean speakers as well?

1. you managed to squeeze 6x9s into the rear parcel tray?
2. you got 6 speakers and only a 4 channel power amp how is it connected?
3. Do you feel the rear tray vibrate?

Buffetfan · 10th August 2005, 01:56

Hi, Sam,
thanks...will do it tomorrow...had already visited cartronics (the hyd distributor) earlier...they told me no discounts...

pranil · 10th August 2005, 13:59

Dear Navin,
I should have gussed that this is the case (SMPS).

The Avtar is Dashboard of New 3 Series BMW.

navin · 10th August 2005, 14:15

thats a nice car you got.

ntomer · 10th August 2005, 15:16

My Sony 7710 accepts Aux input. I was wondering whether I will be able to connect my iPod with it. I don't want the pod interface on my music system, only wants to play my play-lists thru my car system.

\N

navin · 10th August 2005, 16:30

yes and no (http://home.speedfactory.net/tcashin/ipodsony.htm)

I am not 100%sure but from what i understand you wont get the playlists to diplay on the sony HU but you will be able to listen tot he tunes. to see what is playing you'll have to refer to the ipod display.

I have seen Clarioin's, Pio's and Alpine's Ipod connectors but not Sonys so cant comment exactly.

navin · 10th August 2005, 16:33

obviously a universal way is to use either the line out of the ipod to the aux in (you will need something like the Pocket Line out from Send Station) or use an FM modulator but neither of these will allow you to use the HU to view the ipod's play list.

navin · 10th August 2005, 16:38

I would advise against using the headphone out of the ipod to the aux in as it will be a severe compromise in sound quality (ok before a bunch of you audiophiles jump me i will admit that MP3 and the FM modulator are compromises too) besides on 4G ipod it has been found that the output level (for using the phones out to the aux in) is quite low and one has to turn up the volume of th HU to get an acceptable volume levels. 3G ipods strangely do not suffer from this to the same extent. Apple giveth and Apple taketh away!

NC, what do you think?

navin · 10th August 2005, 16:41

Also using the headphones out of the ipod may be a source of ground loops esp if you are using external amplifers in your car stereo and this will be an invitation for alternator whine and other funny noises.

Sam, you AWOL?

ntomer · 10th August 2005, 17:58

hey navin, you scared the **** outta me man. i will leave this iPod connectivity for now. will wait till Sony starts building some standard connector.

\N

9th August 2005, 19:20	#392
pranil BHPian Join Date: Mar 2005 Location: Navi Mumbai Posts: 153 Thanked: 3 Times	Actually this one is for Navin- I always wanted somebody for this answer As I understand car batterires are 12 volts and car speakers are 4 ohms . That means max they can draw is 3 amps . This brings us to max 3 x 3 x 4= 36 wats RMS ( I2R rule). So how does one pump up the sound more than that . and what is the use of having say 50 watt or even 80 watt speakers or 300 watt amplifiers do they actually draw this much. Ok I know that bigger amps and sound systems have bigger and better capacitors to temporaryt bridge the power peaks but that is not the max capacity also when U bridge the amplifier ( say for Sub woofer) does it mean it's current capacity is doubled or volatge is doubled -- in other words parrallel or series). I know that in any case the resultant peak power would go up.
	() Thanks

9th August 2005, 19:53	#393
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,418 Thanked: 9,991 Times	Sam, i figured you like to advise and with me not around you'll have more opportunity. pranil, this is simple esp. after SMPS became the vogue. Before SMPS we used to use inverters to get AC from DC then use a step up transformer to get higher AC voltage and rectify that to higher DC voltage. This used to cause a lot of heat (and hence energy wasted). SMPS are far simpler and far more efficient. When you bridge an amp it can deliver twice the current but it is still limited to the ability of it's power supply so if the amp delivers 3A per channel and 2 channels deliver 6A but the PS is only 5A you will be limited to 5A.
	() Thanks

9th August 2005, 19:59	#394
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,418 Thanked: 9,991 Times	BTW pranil, is that an Octy L&K you have in your avatar?
	() Thanks

9th August 2005, 20:35	#395
nilesh111 BANNED Join Date: Jul 2005 Location: Dahanu Posts: 23 Thanked: 3 Times	Soundstream Rocks Guys Just got a soundstream installed in my Swift nad i say it rocks...The car is not powerful enough to handle the sound....It simply starts to vibrate above the half volume ....got thye following 1. RMS 150W 6 " Front Door Compos 2. Back Door 6" 85 W RMS 3. Back Tray 6*9" 120W RMS 4. 360W RMS 4 channel 5. Sony 7810 IT beats just about everything reviewed her...Forget JBL and Sony and BOSS and etc....Just go for it guys...u wont be disappointed.
	() Thanks

9th August 2005, 22:21	#396
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,418 Thanked: 9,991 Times	I assume you mean a soundstream power amp right? or do you mean speakers as well? 1. you managed to squeeze 6x9s into the rear parcel tray? 2. you got 6 speakers and only a 4 channel power amp how is it connected? 3. Do you feel the rear tray vibrate?
	() Thanks

10th August 2005, 01:56	#397
Buffetfan Senior - BHPian Join Date: May 2005 Location: Hyderabad Posts: 1,130 Thanked: 216 Times	Hi, Sam, thanks...will do it tomorrow...had already visited cartronics (the hyd distributor) earlier...they told me no discounts...
	() Thanks

10th August 2005, 13:59	#398
pranil BHPian Join Date: Mar 2005 Location: Navi Mumbai Posts: 153 Thanked: 3 Times	Dear Navin, I should have gussed that this is the case (SMPS). The Avtar is Dashboard of New 3 Series BMW.
	() Thanks

10th August 2005, 14:15	#399
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,418 Thanked: 9,991 Times	thats a nice car you got.
	() Thanks

10th August 2005, 15:16	#400
ntomer BHPian Join Date: Jun 2005 Location: Vancouver Posts: 647 Thanked: 144 Times	iPod connectivity My Sony 7710 accepts Aux input. I was wondering whether I will be able to connect my iPod with it. I don't want the pod interface on my music system, only wants to play my play-lists thru my car system. \N
	() Thanks

10th August 2005, 16:30	#401
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,418 Thanked: 9,991 Times	yes and no (http://home.speedfactory.net/tcashin/ipodsony.htm) I am not 100%sure but from what i understand you wont get the playlists to diplay on the sony HU but you will be able to listen tot he tunes. to see what is playing you'll have to refer to the ipod display. I have seen Clarioin's, Pio's and Alpine's Ipod connectors but not Sonys so cant comment exactly. Last edited by navin : 10th August 2005 at 16:33.
	() Thanks

10th August 2005, 16:33	#402
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,418 Thanked: 9,991 Times	obviously a universal way is to use either the line out of the ipod to the aux in (you will need something like the Pocket Line out from Send Station) or use an FM modulator but neither of these will allow you to use the HU to view the ipod's play list.
	() Thanks

10th August 2005, 16:38	#403
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,418 Thanked: 9,991 Times	I would advise against using the headphone out of the ipod to the aux in as it will be a severe compromise in sound quality (ok before a bunch of you audiophiles jump me i will admit that MP3 and the FM modulator are compromises too) besides on 4G ipod it has been found that the output level (for using the phones out to the aux in) is quite low and one has to turn up the volume of th HU to get an acceptable volume levels. 3G ipods strangely do not suffer from this to the same extent. Apple giveth and Apple taketh away! NC, what do you think? Last edited by navin : 10th August 2005 at 16:40.
	() Thanks

10th August 2005, 16:41	#404
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,418 Thanked: 9,991 Times	Also using the headphones out of the ipod may be a source of ground loops esp if you are using external amplifers in your car stereo and this will be an invitation for alternator whine and other funny noises. Sam, you AWOL? Last edited by navin : 10th August 2005 at 16:43.
	() Thanks

10th August 2005, 17:58	#405
ntomer BHPian Join Date: Jun 2005 Location: Vancouver Posts: 647 Thanked: 144 Times	hey navin, you scared the **** outta me man. i will leave this iPod connectivity for now. will wait till Sony starts building some standard connector. \N
	() Thanks