Audio Nirvana 6.5" and notch filters

sackerman · 10th July 2009, 08:58 PM

Warning: I am a newb when it comes to speaker building. I just purchased a pair of Audio Nirvana super cast frames in 6.5" size. I did not use David's box plans as it seemed that the driver would have been underdamped. I designed my own box that was about 2/3's the size with a 3" port tube that is 6" long. I removed the tube to see what it would sound like if it were closer to his box design which confirmed my suspicions. Here is the rub, I have noticed that the response around 5-6K is very bright. Now in my simple way of thinking this would have nothing to do with my deviation from his box plans. I don't have an equalizer on my normal stereo so I have been using WinAMP. I have cut the 6K band by about 6db and the 3K about 3db and the 12K about 3db and that seems to 'tame the beast'. So I was contemplating a notch filter that would center around the 6K range but have also been reading about zobel filters that might help in impedance matching. But to be honest I am not sure what to do. Any suggestions? I thought the idea behind fullrange speakers was the simplicity (put em in a box and wire them up). I am discovering that it isn't quite that simple.

By the way the speakers do sound pretty awesome, very transparent, good imaging, just don't like the harshness that gets added as a result of the 'brightness'. Of course they don't compare with my Tannoy D900's but I am planning on selling those to fund several more speaker projects.

sackerman · 11th July 2009, 08:37 PM

Upon further reading I think what I might need is a baffle step correction circuit, but I am not sure how to tell. Any help?

tinitus · 12th July 2009, 04:47 PM

I do enough XO work to know I dont like notch filters

I would consider equaliser, analog or digital

PeteMcK · 13th July 2009, 12:10 AM

If this is the freq response, it's got a nasty peak, I'd try a notch filter: http://www.commonsenseaudio.com/an6.5superspecs.jpg

But the whole treble range is also elevated, which may sound 'very transparent' but will be tiring after a while.
A BSC filter should help with this.

I'd put a series inductor for BSC first, & then deal with the peak - the notch may not need to be so deep if the BSC filter has cut the level already

tinitus · 13th July 2009, 12:48 AM

Or cross it to a small fullrange around 500hz

Crossover?

well, is it different than notch filter

10th July 2009, 08:58 PM	#1
sackerman diyAudio Member Join Date: Jul 2009	Audio Nirvana 6.5" and notch filters Warning: I am a newb when it comes to speaker building. I just purchased a pair of Audio Nirvana super cast frames in 6.5" size. I did not use David's box plans as it seemed that the driver would have been underdamped. I designed my own box that was about 2/3's the size with a 3" port tube that is 6" long. I removed the tube to see what it would sound like if it were closer to his box design which confirmed my suspicions. Here is the rub, I have noticed that the response around 5-6K is very bright. Now in my simple way of thinking this would have nothing to do with my deviation from his box plans. I don't have an equalizer on my normal stereo so I have been using WinAMP. I have cut the 6K band by about 6db and the 3K about 3db and the 12K about 3db and that seems to 'tame the beast'. So I was contemplating a notch filter that would center around the 6K range but have also been reading about zobel filters that might help in impedance matching. But to be honest I am not sure what to do. Any suggestions? I thought the idea behind fullrange speakers was the simplicity (put em in a box and wire them up). I am discovering that it isn't quite that simple. By the way the speakers do sound pretty awesome, very transparent, good imaging, just don't like the harshness that gets added as a result of the 'brightness'. Of course they don't compare with my Tannoy D900's but I am planning on selling those to fund several more speaker projects.

13th July 2009, 12:10 AM	#4
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	If this is the freq response, it's got a nasty peak, I'd try a notch filter: http://www.commonsenseaudio.com/an6.5superspecs.jpg But the whole treble range is also elevated, which may sound 'very transparent' but will be tiring after a while. A BSC filter should help with this. I'd put a series inductor for BSC first, & then deal with the peak - the notch may not need to be so deep if the BSC filter has cut the level already __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

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11th July 2009, 08:37 PM	#2
sackerman diyAudio Member Join Date: Jul 2009	Upon further reading I think what I might need is a baffle step correction circuit, but I am not sure how to tell. Any help?

12th July 2009, 04:47 PM	#3
tinitus diyAudio Moderator Join Date: Nov 2005	I do enough XO work to know I dont like notch filters I would consider equaliser, analog or digital

13th July 2009, 12:48 AM	#5
tinitus diyAudio Moderator Join Date: Nov 2005	Or cross it to a small fullrange around 500hz Crossover? well, is it different than notch filter

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