[Guy 13]

Hi Danny and all Audio Circle members.
Please click on the link, read
and tell me what you think of this extremely simple notch filter?
(I am not sure if it should be called a notch filter or something else.)
Do you think it can work with only an inductor and rehostat?

http://www.transcendentsound.com/Transcendent/DIY_Speakers.html

Guy 13

[rjbond3rd]

Yes, in general, it will work just as described.

The inductor allows low frequencies to pass, but inhibits higher frequencies.  If there's no adjustable resistor (L-Pad), then the higher frequencies are cut off entirely.

But the adjustable resistor (L-Pad) allows treble frequencies to "sneak around" the inductor.  Adjust the amount of resistance, and you adjust the amount of cut.  So you can really shape the result.  The values for the two components can be calculated easily.  Usually, the resistance needs a bit of fine-tuning by ear. 

(I usually add too much, then play some music and reduce the resistance until it sounds right.  If it's still too dull, add a capacitor which lets all high frequencies above a certain point to pass through without attenuation).

[Quiet Earth]

Guy,
Look up baffle step on google. You will find many examples and explanations of baffle step compensation, which is what that circuit is.

I found out that the quality of the inductor seems to matter the most. Have fun with it.

[Guy 13]

Hi all Audio Circle members.

According to my research and findings,
Which are in no way words of God,
I think this is (For me) a simple way to remove the bump of the full range (Or if you prefer: extended range) driver that is usually around 2-5 KHz.
I will be buying a pair of Dayton PS220-8 (Parts Express)
because of the good reviews of everyone.



A question for my Audio Circle friends…
What kill the best and unique sound quality of a full range driver?
The peak in the 2-5 KHz?
Or the peak in the impedance around the Fs?

Guy 13

[FullRangeMan]

Hi all Audio Circle members.

According to my research and findings,
Which are in no way words of God,
I think this is (For me) a simple way to remove the bump of the full range (Or if you prefer: extended range) driver that is usually around 2-5 KHz.
I will be buying a pair of Dayton PS220-8 (Parts Express)
because of the good reviews of everyone.



A question for my Audio Circle friends…
What kill the best and unique sound quality of a full range driver?
The peak in the 2-5 KHz?
Or the peak in the impedance around the Fs?

Guy 13

Hi,
 think this is (For me) a simple way to remove the bump of the full range (Or if you prefer: extended range) driver that is usually around 2-5 KHz.
Yes it is, unfortunately it also will remove the precious fine detail from the music & recording venue, which are the harmonics from the musical notes.
I dont like to say it, but there is no free lunch in electronics, so I would use a filter just after these passive procedures: (specially post #18)
http://www.audiocircle.com/index.php?topic=100689.msg1016047#msg1016047

What kill the best and unique sound quality of a full range driver?
Surely the peak in the 2-5 range.
The Impedance Chart is a by product from the moving parts(cone,suspension, VC) it is not correlated directly to the sound quality, as a peaky Freq Chart.
If the bass freq impedance peak is low or hi, it will had low inpact in the sound quality.
The Impedance & Inductance graphics are a photo from the moving parts in action.
This is how I see the issue, maybe others may disagree.

[Bob_Brines]

A parallel RC filter will work better. Get a simulator program and try some values. 8Ω-6.8μf is usually a good start. Note: you either have a hi-Z amp or a BSC filter in place.

Bob

[hdspeakerman]

http://speakerdesignworks.com/Singularity_1.html
You might want to check this out.  This guy knows what he is doing.  Howard

[Guy 13]

Hi all Audio Circle members.
Look like there are several ways of taming that bump around 2KHz
of most wide range drivers.
(I am interested only with the Dayton PS220-8)
Since the many different experimental ways only involve inexpensive resistors, capacitors and coils,
I might try all of them,
which is up to now, three different ways.
Unless someone that did conclusive experimenting,
then I might go his way,
if it involve a minimalist parts count.
The more parts in the circuit,
the more you kill the benefits
or should I say the magic of the extended range drive.

Guy 13