Go Back   Team-BHP > Under the Hood > In-Car Entertainment


Reply
 
Thread Tools Search this Thread
Old 8th July 2008, 12:58   #31
Team-BHP Support
 
navin's Avatar
 
Join Date: Mar 2004
Location: mumbai
Posts: 22,509
Thanked: 3,885 Times
Default

Quote:
Originally Posted by headers View Post
Ok sir, agreed. But if only one channel is connected to drive the sub as advised. I should not theoretically fry the HU!
no you wont but your sub will not be used fully.

Quote:
Originally Posted by greenhorn View Post
Personally, I've never had issues driving speakers with underpowered amps[Driven or Elegant for this installation
actually this is more true forspeaker systems involving tweeters. an amp that clips will produce a lot of HF energy (square wave) and this energy will damage the tweeter.

Last edited by navin : 8th July 2008 at 13:00.
navin is offline   Reply With Quote
Old 8th July 2008, 13:04   #32
BHPian
 
redfire's Avatar
 
Join Date: Jan 2008
Location: Chicago, The Windy City
Posts: 444
Thanked: 12 Times
Default

I am not a guru but have experienced this, even with well matched amps/speakers. A good quality amp though underpowered may play OK if you are very carefull with volume control. Gradually increasing the volume level and setting it to a moderate level before clipping may work and the setup may run for short/long according to the quality of components. But things will go kaput when a sudden volume level increase/something like that occurs. Last week I had to change two fuses in my home amp (100W RMS @ 8 ohms connected to matching speakers) because of my son who turned the volume control to 80% and I switched on the amp without noticing this. But I have turned the volume to 80% gradually without any problem (even he used to do it, then will get frightened by the volume/punch, cry and run to his mom ).
redfire is offline   Reply With Quote
Old 8th July 2008, 13:30   #33
Team-BHP Support
 
navin's Avatar
 
Join Date: Mar 2004
Location: mumbai
Posts: 22,509
Thanked: 3,885 Times
Default

Quote:
Originally Posted by redfire View Post
But things will go kaput when a sudden volume level increase/something like that occurs.
What you are experiencing is a blown fuse (atleast that is what should happen) not a blown amp.
navin is offline   Reply With Quote
Old 8th July 2008, 13:39   #34
BHPian
 
redfire's Avatar
 
Join Date: Jan 2008
Location: Chicago, The Windy City
Posts: 444
Thanked: 12 Times
Default

Yes Navin Ji, luckily I faced only a blown fuse. But as a whole, the equipment is blown and not playing (in layman's view) and it could be some other components if not fuse next time. Hope it never happens.
redfire is offline   Reply With Quote
Old 8th July 2008, 14:29   #35
Senior - BHPian
 
anujmishra's Avatar
 
Join Date: Jun 2008
Location: Bangalore
Posts: 1,271
Thanked: 338 Times
Default Separate SUB output

In my Sony HU I can see there are 4 channel normal output plus one sub output. In settings, I can see in the SUB setup that can be set in dB from 0 dB to 10 dB.

What, if I try to connect SUB without amplifier in dedicated SUB output of HU ?

If it is not recomended, then why Sony has provided separate SUB output in HU?
anujmishra is offline   Reply With Quote
Old 8th July 2008, 14:32   #36
Senior - BHPian
 
DerAlte's Avatar
 
Join Date: Mar 2007
Location: Bangalore
Posts: 8,076
Thanked: 2,876 Times
Default

Must have been a Fast-blow fuse (thin copper wire). Replace it with a Slow-blow fuse of the same rating. This will not blow on a surge current, yet protect the amp in continuous overload conditions, like lower than designed speaker impedance etc. This used to be a common problem with old CRT TVs - surge current while switching on (early Sunday morning auntie-ji comes running: "Beta, jaldi se kuchh kar de, Mahabharat / Ramayan miss ho jayega").

Your "rotating the knob in a flick" will do the same: produce a surge current. This will, as Navin explained, only blow the fuse by not fry the amp.
DerAlte is offline   Reply With Quote
Old 8th July 2008, 14:35   #37
Senior - BHPian
 
greenhorn's Avatar
 
Join Date: Apr 2007
Location: TN-14
Posts: 6,839
Thanked: 1,318 Times
Default

[A bit OT ] just a doubt. What if the amp had to reproduce a transient of the same magnitude ? will the fuse blow then also ?
greenhorn is offline   Reply With Quote
Old 8th July 2008, 18:15   #38
Senior - BHPian
 
DerAlte's Avatar
 
Join Date: Mar 2007
Location: Bangalore
Posts: 8,076
Thanked: 2,876 Times
Default

Depends on magnitude and duration of transient! The fuse blowing characteristic is a time-current relationship, so higher the current for a short duration, the faster it will blow.
DerAlte is offline   Reply With Quote
Old 9th July 2008, 00:10   #39
Newbie
 
Join Date: May 2008
Location: CHENNAI
Posts: 14
Thanked: 0 Times
Default

Quote:
Originally Posted by greenhorn View Post
yup, that was one way to get surround out of a 2 channel amp in the ye olde days. however , to get the difference signal, you need to connect the + and - of the speakers to either both the +'s of the amp, or both the -'s.

a good idea would be to connect the Right surround speakers + to the left channel +, and the speakers - to the right channel +
the Left surround's + can be connected to the left channel's - , and the speakers - to the right channel's minus ( I'm not entirely sure about the polarities, but i think this should work) And since equal currents will be drawn from all terminals , it should balance everything out .

in a car HU, the amp's ground (0V) terminals are not acessible , only the + and - are ....

Connecting a speakers to both the +'s or both the -'s should not be an issue , since there wont be a lot of current flowing , only the difference.

I only objected to shorting the + and - of the HU. everything else is fine
PS: I didnt get the ridicule bit. Have we ridiculed anyone ?


a bad automotive analogy would be to claim that if you drive around with your handbrake on , the tyres wont be damaged because you are driving slowly or because the engine is underpowered.

no matter how little current you supply, a shorted output is a shorted output ,and will eventually fry your IC's
Thanks for the green signal.
and the ridicule was not for you but for those who try to make the blog more interesting.
raajsree is offline   Reply With Quote
Old 9th July 2008, 00:51   #40
Newbie
 
Join Date: Apr 2006
Location: chennai
Posts: 15
Thanked: 0 Times
Default

Hmm, An Indigo One ton transport vehicle then a Sub with no Amp.
Someones really into destructive testing. But if it works - What the heck?!
Way to go Vikram. BTW I no see ,one Nitrous on this thread. How come? I thought you to go hand in hand in all threads. Fighting....
godseed1670 is offline   Reply With Quote
Old 9th July 2008, 08:27   #41
Senior - BHPian
 
headers's Avatar
 
Join Date: May 2006
Location: Greater Chennai
Posts: 4,589
Thanked: 454 Times
Default

Quote:
Originally Posted by godseed1670 View Post
Hmm, An Indigo One ton transport vehicle then a Sub with no Amp.
Someones really into destructive testing. But if it works - What the heck?!
Way to go Vikram. BTW I no see ,one Nitrous on this thread. How come? I thought you to go hand in hand in all threads. Fighting....
OT: Sir, thank you for actually coming online and browsing through the forum. You have improved!

BTW, what is destructive testing?

I am just exploring the limits! Thanks to you know who!
headers is offline   Reply With Quote
Old 23rd July 2008, 16:36   #42
Newbie
 
Join Date: Oct 2007
Location: Delhi
Posts: 6
Thanked: 0 Times
Default

Quote:
Originally Posted by anujmishra View Post
In my Sony HU I can see there are 4 channel normal output plus one sub output. In settings, I can see in the SUB setup that can be set in dB from 0 dB to 10 dB.

What, if I try to connect SUB without amplifier in dedicated SUB output of HU ?

If it is not recomended, then why Sony has provided separate SUB output in HU?
+1 i also have a similar output on my 7950.. What that output for?
kalpik is offline   Reply With Quote
Old 23rd July 2008, 17:39   #43
Senior - BHPian
 
esteem_lover's Avatar
 
Join Date: Jul 2006
Location: Madras/Py
Posts: 7,554
Thanked: 445 Times
Default

Quote:
Originally Posted by godseed1670 View Post
Hmm, An Indigo One ton transport vehicle then a Sub with no Amp.
Someones really into destructive testing. But if it works - What the heck?!
Way to go Vikram. BTW I no see ,one Nitrous on this thread. How come? I thought you to go hand in hand in all threads. Fighting....
haa! godseed, how is the seeding season this year ? Need any help to lug around your seeds, you know who to call.

Quote:
Originally Posted by headers View Post
OT: Sir, thank you for actually coming online and browsing through the forum. You have improved!

BTW, what is destructive testing?

I am just exploring the limits! Thanks to you know who!
Is there any limits left to explore ?

Sorry for going offtopic.

Last edited by esteem_lover : 23rd July 2008 at 17:41.
esteem_lover is offline   Reply With Quote
Old 23rd July 2008, 17:45   #44
Senior - BHPian
 
greenhorn's Avatar
 
Join Date: Apr 2007
Location: TN-14
Posts: 6,839
Thanked: 1,318 Times
Default

Quote:
Originally Posted by kalpik View Post
+1 i also have a similar output on my 7950.. What that output for?
to drive subs , maybe smaller ones. and definitely not in bridged mode
greenhorn is offline   Reply With Quote
Old 23rd July 2008, 19:06   #45
Awaiting Email Confirmation
 
Join Date: Apr 2007
Location: Gurgaon
Posts: 379
Thanked: 3 Times
Default

Quote:
Originally Posted by greenhorn View Post
to drive subs , maybe smaller ones. and definitely not in bridged mode
Smaller subs ?

Any examples ? Can I hook in my creative PC sub ?
nitin.dangayach is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Which Subwoofer and Amplifier ramie2400 In-Car Entertainment 86 14th April 2009 12:06
SubWoofer and Amplifier Query EDIT: now need only Amp under 8k nitin.dangayach In-Car Entertainment 122 12th February 2009 20:56
Help in selecting Amplifier and Subwoofer for my Wagon-R ravi@64bhp In-Car Entertainment 37 28th June 2008 20:40
Blaupunkt Subwoofer and Kenwood Amplifier for sale general_neo Shifting gears 7 25th December 2005 13:32
best subwoofer-amplifier combination for Rs.10-15k nitrous In-Car Entertainment 14 1st November 2004 13:21


All times are GMT +5.5. The time now is 08:35.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks