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


Reply
 
Thread Tools Search this Thread
Old 14th April 2008, 13:28   #1
BHPian
 
Gill's Avatar
 
Join Date: Aug 2007
Location: Mohali
Posts: 699
Thanked: 12 Times
Default Problem:-Sub playing the frequecies higher then LPF!!

I have a problem!I am running fronts+sub-woofer setup. Rear speakers are powered from HU but the internal amp of HU is turned off.With fader set to rear, one can hear the vocals and music played by sub-woofer.LPF is set at 80 hz.What could be the root of problem and what is the way out!
Gill is offline   Reply With Quote
Old 14th April 2008, 13:49   #2
Senior - BHPian
 
Join Date: Mar 2006
Location: Faridabad
Posts: 6,814
Thanked: 294 Times
Default

Music is heard from the sub some part but a very little. Do you feel the sub is playing full range try changing the RCA`s.
low_bass_makker is offline   Reply With Quote
Old 14th April 2008, 14:04   #3
Senior - BHPian
 
Bass&Trouble's Avatar
 
Join Date: Mar 2006
Location: Bombay
Posts: 2,744
Thanked: 71 Times
Default

Which head unit? If you have LPF on the head unit set to 80Hz and are using the correct channel (subwoofer out) to hook to the subwoofer amp, there's no way the sub can play mid band.

Try switching in the LPF on the amplifier and see if the mids go away. If it does, then you are using some incorrect pre-out for the sub.

If you have switched off the head unit's internal amp, how are rears running?
Bass&Trouble is offline   Reply With Quote
Old 14th April 2008, 15:20   #4
BHPian
 
Gill's Avatar
 
Join Date: Aug 2007
Location: Mohali
Posts: 699
Thanked: 12 Times
Default

Quote:
Originally Posted by low_bass_makker View Post
Music is heard from the sub some part but a very little. Do you feel the sub is playing full range try changing the RCA`s.
One can hear the Vocals and higher fequencies to an extent and one can hear it sitting in driver's seat.

Quote:
Originally Posted by Bass&Trouble View Post
Which head unit? If you have LPF on the head unit set to 80Hz and are using the correct channel (subwoofer out) to hook to the subwoofer amp, there's no way the sub can play mid band.

Try switching in the LPF on the amplifier and see if the mids go away. If it does, then you are using some incorrect pre-out for the sub.

If you have switched off the head unit's internal amp, how are rears running?
Head unit is Alpine 9887.RCA is conected thru sub pre-out to JBL bridged rear two channel.
Ajay bhai rears are not working, i am using fronts+sub only.Crossovers of HU are functional and AMP is running on flat settings.
Gill is offline   Reply With Quote
Old 14th April 2008, 15:21   #5
Team-BHP Support
 
navin's Avatar
 
Join Date: Mar 2004
Location: mumbai
Posts: 22,509
Thanked: 3,884 Times
Default

Quote:
Originally Posted by Gill View Post
I have a problem!I am running fronts+sub-woofer setup. Rear speakers are powered from HU but the internal amp of HU is turned off.
Quote:
Originally Posted by Bass&Trouble View Post
If you have switched off the head unit's internal amp, how are rears running?
I almost always prefer to use the LPF and HPF on the amp as it is less liable to be changed by my driver or when my car goes for service.

I think Gill has an ingenious idea. Using this set up, when the car engine is running one can fade the subwoofer and front levels up there by using the amp. when the car is stationary fade the front and rears down hence the amp is now just idling. With Class D and Class AB amps this really saves the battery and one can still listen to some music while waiting in the car.

Gill, just check if the XO freq. and the slope have both been set. if te XO freq has been set to 80hz but the slope is 0db/octave then you will still have fullrange coming from the subwoofer. Set your slope to atleast 12db/octave (2nd order).

Last edited by navin : 14th April 2008 at 15:24.
navin is offline   Reply With Quote
Old 14th April 2008, 15:27   #6
BHPian
 
Autophile's Avatar
 
Join Date: Sep 2005
Location: New Delhi
Posts: 930
Thanked: 0 Times
Default

Quote:
Originally Posted by Gill View Post
Head unit is Alpine 9887.RCA is conected thru sub pre-out to JBL bridged rear two channel.
Ajay bhai rears are not working, i am using fronts+sub only.Crossovers of HU are functional and AMP is running on flat settings.
Do the following steps:

1. Check the RCA Cable Connection, should be connected to Low RCA outputs on the HU.

2. Turn off the crossovers from the amplifiers.

3. Set the crossovers from the 9887 - Crossover Menu.

4. Check the slope setting of the subwoofer crossover. If it is 0 then the crossover is bypass. Set it to where ever it sounds better.

Start with 12dB (Second Order) and choose between 12, 18 & 24 which ever sounds better. After the selection of the slope flip the phase of the sub woofer and use the one where it sounds blended with your front speakers.
Autophile is offline   Reply With Quote
Old 14th April 2008, 16:18   #7
BHPian
 
ScarySkulls's Avatar
 
Join Date: Mar 2004
Location: Halifax, N.S.
Posts: 623
Thanked: 19 Times
Default

Quote:
Originally Posted by low_bass_makker View Post
Do you feel the sub is playing full range try changing the RCA`s.
You mean the RCA cable or how it's connected to the Pre-Outs?
ScarySkulls is offline   Reply With Quote
Old 14th April 2008, 16:25   #8
Senior - BHPian
 
Join Date: Mar 2006
Location: Faridabad
Posts: 6,814
Thanked: 294 Times
Default

Quote:
Originally Posted by ScarySkulls View Post
You mean the RCA cable or how it's connected to the Pre-Outs?
What do you suggest
low_bass_makker is offline   Reply With Quote
Old 14th April 2008, 16:49   #9
BHPian
 
Gill's Avatar
 
Join Date: Aug 2007
Location: Mohali
Posts: 699
Thanked: 12 Times
Default

Just Re-checked the RCA,all is fine at this end.
In 9887 there the four options in cross over menu which are like this:-
And these are the current settings too.
BAND Output level cut-off freq slope
High 0 80 12
Mid 0 80 12
Low 0 80 12

Even when i brought down the lows to 63hz n 50hz the voacals were audible with fader set to rear but when set at 50hz the level of vocals and music went down considerable yet they are audible.

Last edited by Gill : 14th April 2008 at 16:55.
Gill is offline   Reply With Quote
Old 14th April 2008, 16:57   #10
BHPian
 
ScarySkulls's Avatar
 
Join Date: Mar 2004
Location: Halifax, N.S.
Posts: 623
Thanked: 19 Times
Default

Quote:
Originally Posted by low_bass_makker View Post
What do you suggest
I believe the Cables used are good quality and connections were made perfectly well.
Now what would I suggest except asking you to please clarify the reply as it can mean either of the two things, the way it's written.
Isn't it?
ScarySkulls is offline   Reply With Quote
Old 14th April 2008, 17:14   #11
Senior - BHPian
 
Join Date: Mar 2006
Location: Faridabad
Posts: 6,814
Thanked: 294 Times
Default

Quote:
Originally Posted by ScarySkulls View Post
I believe the Cables used are good quality and connections were made perfectly well.
Now what would I suggest except asking you to please clarify the reply as it can mean either of the two things, the way it's written.
Isn't it?
I think Gill knows what I said. So I think there is no point discussing it further.
low_bass_makker is offline   Reply With Quote
Old 14th April 2008, 17:21   #12
Senior - BHPian
 
Join Date: Mar 2006
Location: Faridabad
Posts: 6,814
Thanked: 294 Times
Default

Quote:
Originally Posted by Gill View Post
BAND Output level cut-off freq slope
High 0 80 12
Mid 0 80 12
Low 0 80 12
In this the 0 is the level 80 is the cut off freq and 12 is the slope.

So according to this everything should be fine.
low_bass_makker is offline   Reply With Quote
Old 14th April 2008, 17:45   #13
BHPian
 
Gill's Avatar
 
Join Date: Aug 2007
Location: Mohali
Posts: 699
Thanked: 12 Times
Default

any other pointers!RCAs are working fine checked them both from HU end and Amp end!
I would love to learn what difference does high n mid crossovers make in my set up,when both are set at 80Hz.
Gill is offline   Reply With Quote
Old 14th April 2008, 18:40   #14
BHPian
 
Autophile's Avatar
 
Join Date: Sep 2005
Location: New Delhi
Posts: 930
Thanked: 0 Times
Default

Your subwoofer amplifier is running of the Rear preouts. Hence the subwoofer is playing 80Hz and above.

Switch the RCA to the Low output of the HU and it will be fine.
Autophile is offline   Reply With Quote
Old 14th April 2008, 19:35   #15
BHPian
 
ScarySkulls's Avatar
 
Join Date: Mar 2004
Location: Halifax, N.S.
Posts: 623
Thanked: 19 Times
Default

Quote:
Originally Posted by low_bass_makker View Post
I think Gill knows what I said. So I think there is no point discussing it further.
There is a difference between "Discussion" and a mere "Request for clarification", Raghhvinder.

Anyways, I guess you were pointing towards checking the connections. Didnt automatically assume that, because checking for the most likely errors would have been the first thing that would have come to your mind, when you met Gill and Auditioned his setup. Looks like you guys hardly met for 5 minutes or so. Out station travelling means a pretty hectic schedule, I'm sure.

Anyways, glad to know Gill did the needful now.

So, Gill sahab, the RCA cable, that connects to the rear channels of the amplifier at one end, is correctly connected to Sub Pre-out at the other end then?
ScarySkulls 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
HPF & LPF settings ? prashantk007 In-Car Entertainment 41 26th October 2017 16:11
Problem In Playing Videos In Jvc Mp3 Vcd Player torque.steer In-Car Entertainment 1 16th March 2010 19:49
Which one: Dual 8" sub V/s Single 10" sub? Invinsible In-Car Entertainment 53 28th May 2009 13:33
ground zero Sub vs image dynamics Sub rohanGT In-Car Entertainment 105 29th March 2009 05:01
Owner got 2 carried away playing holi /w his lambo _Crazi4Speed_ The International Automotive Scene 12 15th June 2005 16:44


All times are GMT +5.5. The time now is 04:16.

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