HPF & LPF settings ?

prashantk007 · 7th June 2007, 17:23

How do one go about and determine which is the best optimal HPF and LPF setting for car audio setup. What are the factors affecting this ? .while tuning this what all factors or other settings should be taken in to consideration?
I know listening and trying out diffent setting is the best way but any guide lines ,suggestions before doing this task would be help ful ..
I tried searching the old threads but all says different settings ...

I have the following setup for my wagonr.
HU -6950 ib
front- boston 4.25" compos.
amp - jbl 60.4
rear - jbl 937
sub- jbl

Mugen_Power · 7th June 2007, 18:25

prashantk007,

Check out this post and this thread. Might be helpful to you.

navin · 7th June 2007, 18:41

4" drivers would be limited to 100Hz at best. The 6x9 can be run down to 40Hz snce you have a sub.

gunbir · 7th June 2007, 19:08

prashant, I'm assuming you have gone through the glossary and know what HPF/LPF means.

Now, your HU has one HPF setting for front AND Rear speakers. That poses an issue. Your front speakers are 4" while your rears are 6x9s. The problem is that the rears can take more bass then the fronts. So if you set HPF considering the rears (say 80Hz) the fronts might distort. And if you set HPF considering the fronts (say 100 or 125Hz), you will get no usable low bass output from your rears.

I suggest you run the 4" components off the amp. If you are already doing this, then set the HPF at the HU to 80Hz and the LPF to 80Hz as well. On your amp, the channels used for the front comps will have a HPF as well. Enable that (may be set to bypass/off) and set it at 100Hz or so.
On the other set of channels that are running the sub, let the filter be on bypass/off.

low_bass_makker · 7th June 2007, 20:11

since your is a 695O you can indepenedtly cross the speakers as you wish...for the 4 inch driver I would choose 100 or 125Hz and for the oval I would go for 80Hz ...and for the sub 80 hz is good one.....

these are ideal settings which works good for nearly maJor setups......

gunbir · 7th June 2007, 22:00

Quote:

Originally Posted by low_bass_makker

since your is a 695O you can indepenedtly cross the speakers as you wish...for the 4 inch driver I would choose 100 or 125Hz and for the oval I would go for 80Hz ...and for the sub 80 hz is good one.....

LBM, do you have a special edition 6950 with you that has separate HPF for front and rear? Cuz the regular 6950 that us mere mortals buy, doesn't!!! Please read the other posts...

prashantk007 · 8th June 2007, 00:08

Gunbir bhai .....thanks for the explanation ....I have a 5.25 " boston component speakers on the front door really apologize for the giving the worng data initially (was kinda absent minded while composing the post)

For 5.25" also you suggest the same ? My jbl 60.4 amp is driving the front compos and the sub.

gunbir · 8th June 2007, 00:43

Quote:

Originally Posted by prashantk007

Gunbir bhai .....thanks for the explanation ....I have a 5.25 " boston component speakers on the front door really apologize for the giving the worng data initially (was kinda absent minded while composing the post)

For 5.25" also you suggest the same ? My jbl 60.4 amp is driving the front compos and the sub.

5.25" compos can be HPF'd at 80 Hz too... they should be fine with that much power. I suggest you keep your amp's HPF and LPF set to OFF/BYPASS. And set HPF and LPF both at 80Hz from your HU.

If you know what the amp gains (level knobs) are, please ensure they are set somewhere under 50% level.

Cheers.

low_bass_makker · 8th June 2007, 02:57

Quote:

Originally Posted by gunbir

LBM, do you have a special edition 6950 with you that has separate HPF for front and rear? Cuz the regular 6950 that us mere mortals buy, doesn't!!! Please read the other posts...

My bad sir...I overlooked...

prashantk007 · 8th June 2007, 10:41

okies... Thanks gunbir bhai and all for the inputs i will try this out :-).

gopz · 8th June 2007, 10:49

Can someone let me know the best settings for my amp too..I have a M800 with Alpine 690A (6x9, 3-way coaxials) on the rear hatch. Front RF tweeters connected to HU (Alpine 9846E). Amp is JBL CS60.4. Sub is 8" Polk Audio.

Y splitter is used to connect inputs to the amp since my HU has one pre out only.

navin · 8th June 2007, 13:02

Quote:

Originally Posted by gopz

...Front RF tweeters connected to HU (Alpine 9846E....

no midbass in the front. I thnk that is the first thing you shoudl do. add a pair of midbass drivers in the front.

low_bass_makker · 8th June 2007, 14:07

Quote:

Originally Posted by gopz

Can someone let me know the best settings for my amp too..I have a M800 with Alpine 690A (6x9, 3-way coaxials) on the rear hatch. Front RF tweeters connected to HU (Alpine 9846E). Amp is JBL CS60.4. Sub is 8" Polk Audio.

Y splitter is used to connect inputs to the amp since my HU has one pre out only.

as Navin Ji suggested get a pair of components in the front and wire the ovals with the HU and then tune the setup and also remove the tweeter as a matching pair will be coming with the component kit

ported_head · 8th June 2007, 14:10

Can somebody please tell me how to tune my system? I have Pio 4950 and JBL compos in the front and coaxials in the back. I like clarity, moderate bass and not too much ching ching from the tweeters. Please help. I like various genres of Rock, occasional Rap. Atleast where to start? There must be a method to the madness, no?

low_bass_makker · 8th June 2007, 14:32

Quote:

Originally Posted by ported_head

Can somebody please tell me how to tune my system? I have Pio 4950 and JBL compos in the front and coaxials in the back. I like clarity, moderate bass and not too much ching ching from the tweeters. Please help. I like various genres of Rock, occasional Rap. Atleast where to start? There must be a method to the madness, no?

Sir I would suggest to drop down to sealords tomm for the meet and we can adjust the setting to make it sound better.....

7th June 2007, 17:23	#1
prashantk007 BHPian Join Date: Dec 2006 Location: bangalore Posts: 27 Thanked: Once	HPF & LPF settings ? How do one go about and determine which is the best optimal HPF and LPF setting for car audio setup. What are the factors affecting this ? .while tuning this what all factors or other settings should be taken in to consideration? I know listening and trying out diffent setting is the best way but any guide lines ,suggestions before doing this task would be help ful .. I tried searching the old threads but all says different settings ... I have the following setup for my wagonr. HU -6950 ib front- boston 4.25" compos. amp - jbl 60.4 rear - jbl 937 sub- jbl
	() Thanks

7th June 2007, 18:25	#2
Mugen_Power Senior - BHPian Join Date: Oct 2005 Location: Gujarat 03 Posts: 1,302 Thanked: 18 Times	prashantk007, Check out this post and this thread. Might be helpful to you.
	() Thanks

7th June 2007, 18:41	#3
navin Team-BHP Support Join Date: Mar 2004 Location: Mumbai Posts: 25,326 Thanked: 9,518 Times	4" drivers would be limited to 100Hz at best. The 6x9 can be run down to 40Hz snce you have a sub.
	() Thanks

7th June 2007, 19:08	#4
gunbir Senior - BHPian Join Date: Sep 2005 Location: New Delhi Posts: 2,465 Thanked: 33 Times	prashant, I'm assuming you have gone through the glossary and know what HPF/LPF means. Now, your HU has one HPF setting for front AND Rear speakers. That poses an issue. Your front speakers are 4" while your rears are 6x9s. The problem is that the rears can take more bass then the fronts. So if you set HPF considering the rears (say 80Hz) the fronts might distort. And if you set HPF considering the fronts (say 100 or 125Hz), you will get no usable low bass output from your rears. I suggest you run the 4" components off the amp. If you are already doing this, then set the HPF at the HU to 80Hz and the LPF to 80Hz as well. On your amp, the channels used for the front comps will have a HPF as well. Enable that (may be set to bypass/off) and set it at 100Hz or so. On the other set of channels that are running the sub, let the filter be on bypass/off.
	() Thanks

7th June 2007, 20:11	#5
low_bass_makker Senior - BHPian Join Date: Mar 2006 Location: Faridabad Posts: 6,815 Thanked: 305 Times View My Garage	since your is a 695O you can indepenedtly cross the speakers as you wish...for the 4 inch driver I would choose 100 or 125Hz and for the oval I would go for 80Hz ...and for the sub 80 hz is good one..... these are ideal settings which works good for nearly maJor setups......
	() Thanks

8th June 2007, 00:08	#7
prashantk007 BHPian Join Date: Dec 2006 Location: bangalore Posts: 27 Thanked: Once	Gunbir bhai .....thanks for the explanation ....I have a 5.25 " boston component speakers on the front door really apologize for the giving the worng data initially (was kinda absent minded while composing the post) For 5.25" also you suggest the same ? My jbl 60.4 amp is driving the front compos and the sub.
	() Thanks

8th June 2007, 10:41	#10
prashantk007 BHPian Join Date: Dec 2006 Location: bangalore Posts: 27 Thanked: Once	okies... Thanks gunbir bhai and all for the inputs i will try this out :-).
	() Thanks

8th June 2007, 10:49	#11
gopz BHPian Join Date: Apr 2007 Location: India Posts: 452 Thanked: 6 Times View My Garage	Help me too! Can someone let me know the best settings for my amp too..I have a M800 with Alpine 690A (6x9, 3-way coaxials) on the rear hatch. Front RF tweeters connected to HU (Alpine 9846E). Amp is JBL CS60.4. Sub is 8" Polk Audio. Y splitter is used to connect inputs to the amp since my HU has one pre out only.
	() Thanks

8th June 2007, 14:10	#14
ported_head Senior - BHPian Join Date: Mar 2004 Location: Mumbai, India Posts: 2,387 Thanked: 20 Times	Can somebody please tell me how to tune my system? I have Pio 4950 and JBL compos in the front and coaxials in the back. I like clarity, moderate bass and not too much ching ching from the tweeters. Please help. I like various genres of Rock, occasional Rap. Atleast where to start? There must be a method to the madness, no?
	() Thanks