2 Subs - Dual Mono or Stereo - "Kb ka dB"

Autophile · 5th June 2006, 18:56

The frequency you choose in (HPF or LPF) is the point from where the cutof (shelving) above or below that frequency point takes place. The attenuation is dependent on slope which is represented in dB/oct, decibles attenuated per octave of frequency spectrum above or below the cut off point.

Even at 36db/oct slope at 100Hz your subwoofer is playing information above 100Hz.

6db/oct is the shallowest (first order) and the steepest can go upto 72dB/oct (12th order) though in car audio only upto 36 dB/oct (6th order) is used. Some reference equipment now alows to go even higher.

Slope plays very important in integration of drivers, also the phase alignment is dependent on the slope you choose.

kb100 · 5th June 2006, 19:01

IS that a sidestep??... or a request??

low_bass_makker · 5th June 2006, 19:02

It measn that in 24db or we can say 5th order how much information will above 100 hz ????????????

I did not meant that if the crossover point is 100 hx there will be no freq above 100hz they will be less.

If the subwoofer is installed in the rear tray, setting a high cut-off frequency of L.P.F. of the subwoofer separates the bass and gives the listener the feeling that the bass is coming from behind. The L.P.F. of the subwoofer is recommended to be set at 100 Hz or below.

kb100 · 5th June 2006, 19:04

**singing**

Here comes the side-steppa ..muuuurderer
I yam the SPL gangsta ..muuurderer
Pick up the subs in the area ... muuurderer
Still the slopes are like thaaat .. muuuurderer!!

am inspired by you know who!!

Autophile · 5th June 2006, 19:06

Quote:

Originally Posted by low_bass_makker

DETECTED !!!!!

IP Address : XXX.XXX.XXX.XXX originating from xxx has initiated Yahoo search for "Crossover Slopes Tutorials".

Way to long to answer man...........

Hahahhahahhahha...Get original....rather than fading your Ctrl, C, V keys of your keyboard.

low_bass_makker · 5th June 2006, 19:14

Quote:

Originally Posted by Autophile

Slope plays very important in integration of drivers, also the phase alignment is dependent on the slope you choose.

Sir shed some light .................

kb100 · 5th June 2006, 19:22

... LBM... When using extracts from other places pls mention the source... You can get the forum into serious trouble if you dont!

And if that is a downloadable resource will be grateful if you could PM me the link...

low_bass_makker · 5th June 2006, 19:35

I will give the source here it self that everbody will get the benifit.
It is from the Pioneer Site there Premium EQ DEX-P90RS manual link is below......
http://www.pioneer.eu/eur/product_de...onomy_id=25-29

U can download the manual from the above site..........

http://www.pioneer.eu/eur/content/su...t/manuals.html

here is the link for the manual as it will be difficult for some people to find how to download the manual as it is no directly linked on the above page..............

kb100 · 5th June 2006, 20:09

Thank you very much LBM! ...

Yes... now my understanding is muddy - despite reading what you had posted... all I could understand was the slopes are different for a parcel tray and a box in the boot install ... Wonder if I am right on that... Yes a simpler explanation would be most welcome!

Bass&Trouble · 5th June 2006, 20:31

My suggestion is let's all wait for a while till Navin dives in head-first with some Linkwitz-Riley, Bessels and some Butterworth for good measure. I somehow have a feeling he's going to enjoy this one.

Autophile · 5th June 2006, 21:51

B&T to make the discussion even more interesting...can you please include the 4th type too

Bass&Trouble · 5th June 2006, 22:24

I don't like the fourth type because I can't pronounce it properly.

philipreji · 5th June 2006, 22:38

Quote:

Originally Posted by santosh.s

When you are saying Low E is 42Hz, that makes sense only if it is a sine wave. In practice no instrument produce pure sine waves, they produce a spectrum of frequencis. As per my knowledge, flute is the instrument which comes close to producing sine waves. Is that the case with guitars also?? I guess not.

My 2 cents: That 42 Hz will be the fundamental frequency. The note will also contain higher harmonics (Fourier components), but not lower frequencies. The sum total of this fundamental plus the harmonics is sometimes referred to as the "timbre" of the instrument. Different instruments (eg. A violin and a harmonium) playing the same note sounds different (ie, have different timbres) because the relative strengths of the high harmonics are different in them.
In the same vein, it is easy to understand why the high frequency cut-off of hi-fi amps are often extended upto 100 kHz or more. Suppose our hearing limit is 20 kHz. But a 20 kHz note from an instrument will definitely contain 40 kHz, 60 kHz etc, in different amounts. A faithful amp should reproduce these frequencies too: otherwise it is distortion (whether this distortion can be "heard" or not is a subject vast enough for another never-ending thread

)
cheers
Reji

low_bass_makker · 5th June 2006, 22:39

Please use the edit feature usefully, It means I never wrote the above statment.............
Mods If u can Plz see to it................

Sam Kapasi · 5th June 2006, 22:47

hmmm.... Honestly LBM, I mean you no ill-will, but you have to understand the first role of a forum, there's no place for an ego here.

I understand you mean well and love audio greatly. There are a lot of people here that love audio too, as much as you do. Of these people, a few are more knowledgeable that the others, simply because it is their business, or others because it is their eccentricity and they have years of that behind them.
You know what I do for a living don't you, my friend? And yet i learn from everyone here, without trying to prove that what i feel is right.

This is audio, LBM, there is no right or wrong. It's a matter of taste and there's no accounting for taste is there? So really, I agree with you in priniciple and so does B&T and we are happy to not entirely agree with Autophile and Gunbir and we're all cool with it.

There will always be an opinion that will differ with yours. Enjoy it. It's no fun if everyone thinks the way you do.

I meant this as good advice and mean no offense to you. In fact I like your enthusiasm, sometimes.

5th June 2006, 18:56	#106
Autophile BHPian Join Date: Sep 2005 Location: New Delhi Posts: 931 Thanked: 4 Times	The frequency you choose in (HPF or LPF) is the point from where the cutof (shelving) above or below that frequency point takes place. The attenuation is dependent on slope which is represented in dB/oct, decibles attenuated per octave of frequency spectrum above or below the cut off point. Even at 36db/oct slope at 100Hz your subwoofer is playing information above 100Hz. 6db/oct is the shallowest (first order) and the steepest can go upto 72dB/oct (12th order) though in car audio only upto 36 dB/oct (6th order) is used. Some reference equipment now alows to go even higher. Slope plays very important in integration of drivers, also the phase alignment is dependent on the slope you choose. Last edited by Autophile : 5th June 2006 at 18:57.
	() Thanks

5th June 2006, 19:01	#107
kb100 Senior - BHPian Join Date: Feb 2006 Location: Bangy Boy! Posts: 1,556 Thanked: 23 Times	IS that a sidestep??... or a request?? Last edited by kb100 : 5th June 2006 at 19:03.
	() Thanks

5th June 2006, 19:02	#108
low_bass_makker Senior - BHPian Join Date: Mar 2006 Location: Faridabad Posts: 6,813 Thanked: 306 Times View My Garage	It measn that in 24db or we can say 5th order how much information will above 100 hz ???????????? I did not meant that if the crossover point is 100 hx there will be no freq above 100hz they will be less. If the subwoofer is installed in the rear tray, setting a high cut-off frequency of L.P.F. of the subwoofer separates the bass and gives the listener the feeling that the bass is coming from behind. The L.P.F. of the subwoofer is recommended to be set at 100 Hz or below. Last edited by low_bass_makker : 5th June 2006 at 19:10.
	() Thanks

5th June 2006, 19:04	#109
kb100 Senior - BHPian Join Date: Feb 2006 Location: Bangy Boy! Posts: 1,556 Thanked: 23 Times	singing Here comes the side-steppa ..muuuurderer I yam the SPL gangsta ..muuurderer Pick up the subs in the area ... muuurderer Still the slopes are like thaaat .. muuuurderer!! am inspired by you know who!! Last edited by kb100 : 5th June 2006 at 19:10.
	() Thanks

5th June 2006, 19:22	#112
kb100 Senior - BHPian Join Date: Feb 2006 Location: Bangy Boy! Posts: 1,556 Thanked: 23 Times	... LBM... When using extracts from other places pls mention the source... You can get the forum into serious trouble if you dont! And if that is a downloadable resource will be grateful if you could PM me the link... Last edited by kb100 : 5th June 2006 at 19:24.
	() Thanks

5th June 2006, 19:35	#113
low_bass_makker Senior - BHPian Join Date: Mar 2006 Location: Faridabad Posts: 6,813 Thanked: 306 Times View My Garage	I will give the source here it self that everbody will get the benifit. It is from the Pioneer Site there Premium EQ DEX-P90RS manual link is below...... http://www.pioneer.eu/eur/product_de...onomy_id=25-29 U can download the manual from the above site.......... http://www.pioneer.eu/eur/content/su...t/manuals.html here is the link for the manual as it will be difficult for some people to find how to download the manual as it is no directly linked on the above page.............. Last edited by low_bass_makker : 5th June 2006 at 19:38.
	() Thanks

5th June 2006, 20:09	#114
kb100 Senior - BHPian Join Date: Feb 2006 Location: Bangy Boy! Posts: 1,556 Thanked: 23 Times	Thank you very much LBM! ... Yes... now my understanding is muddy - despite reading what you had posted... all I could understand was the slopes are different for a parcel tray and a box in the boot install ... Wonder if I am right on that... Yes a simpler explanation would be most welcome!
	() Thanks

5th June 2006, 20:31	#115
Bass&Trouble Senior - BHPian Join Date: Mar 2006 Location: Bombay Posts: 2,756 Thanked: 137 Times	My suggestion is let's all wait for a while till Navin dives in head-first with some Linkwitz-Riley, Bessels and some Butterworth for good measure. I somehow have a feeling he's going to enjoy this one.
	() Thanks

5th June 2006, 21:51	#116
Autophile BHPian Join Date: Sep 2005 Location: New Delhi Posts: 931 Thanked: 4 Times	B&T to make the discussion even more interesting...can you please include the 4th type too
	() Thanks

5th June 2006, 22:24	#117
Bass&Trouble Senior - BHPian Join Date: Mar 2006 Location: Bombay Posts: 2,756 Thanked: 137 Times	I don't like the fourth type because I can't pronounce it properly.
	() Thanks

5th June 2006, 22:39	#119
low_bass_makker Senior - BHPian Join Date: Mar 2006 Location: Faridabad Posts: 6,813 Thanked: 306 Times View My Garage	Please use the edit feature usefully, It means I never wrote the above statment............. Mods If u can Plz see to it................ Last edited by low_bass_makker : 5th June 2006 at 22:44.
	() Thanks

5th June 2006, 22:47	#120
Sam Kapasi Distinguished - BHPian Join Date: Jul 2005 Location: Mumbai (but wat Posts: 6,935 Thanked: 2,480 Times View My Garage	hmmm.... Honestly LBM, I mean you no ill-will, but you have to understand the first role of a forum, there's no place for an ego here. I understand you mean well and love audio greatly. There are a lot of people here that love audio too, as much as you do. Of these people, a few are more knowledgeable that the others, simply because it is their business, or others because it is their eccentricity and they have years of that behind them. You know what I do for a living don't you, my friend? And yet i learn from everyone here, without trying to prove that what i feel is right. This is audio, LBM, there is no right or wrong. It's a matter of taste and there's no accounting for taste is there? So really, I agree with you in priniciple and so does B&T and we are happy to not entirely agree with Autophile and Gunbir and we're all cool with it. There will always be an opinion that will differ with yours. Enjoy it. It's no fun if everyone thinks the way you do. I meant this as good advice and mean no offense to you. In fact I like your enthusiasm, sometimes.
	() Thanks