NSB Speaker *PIC*

[unknownuser]

http://i19.photobucket.com/albums/b191/joes23/XoverforNSB.gif

Provided Link: http://i19.photobucket.com/albums/b191/joes23/XoverforNSB.gif


Ok guys... all input is welcome!!

Xover to the speaker layout.

What do you think?

Thanks


(Originally posted by: joes23)

[unknownuser]

http://i19.photobucket.com/albums/b191/joes23/XoverforNSBandOnkyoTweeter.gif

Provided Link: http://i19.photobucket.com/albums/b191/joes23/XoverforNSBandOnkyoTweeter.gif





(Originally posted by: joes23)

[Chris Roemer]

Well, without know anything about your drivers, it SEEMS like your tweets are coming on at 5k, and your woofs at 2k. Little gap there, but maybe not?

I DO think you'll have tons of lobing issues if you're planning on running those laying down like that.

[unknownuser]

cj thanks for the input...

> Well, without know anything about your
> drivers, it SEEMS like your tweets are
> coming on at 5k, and your woofs at 2k.
> Little gap there, but maybe not?

> I DO think you'll have tons of lobing issues
> if you're planning on running those laying
> down like that.

They will be on the celing/wall at a 45 degree angle aiming at the listner ... They will be used as home theater righ left and rear suround speakers.


(Originally posted by: joes23)

[Wolf]

> cj thanks for the input...

> They will be on the celing/wall at a 45
> degree angle aiming at the listner ... They
> will be used as home theater righ left and
> rear suround speakers.

He had an ARC around the seating area with taper, and 3 speaker arrays around the arc in one box for 6.1 surround duty. Not been implemented, just brainstormed.
FR,
Wolf

[Bruce]

http://www.billfitzmaurice.com/plans/images/SL%2001.jpg


Try Bill Fitzmaurice's "Short Line Array Stereo/Home Theatre Speaker". About 26"X7"X6". See it described here -
<A HREF="http://www.billfitzmaurice.com/plans/product_info.php/products_id/22">http://www.billfitzmaurice.com/plans/product_info.php/products_id/22</A>

[cjd]

Well...

I'm a bit confused by your low value inductor on the NSB's, and why you went zobel. :)

At any rate, this is the same drivers and same end impedance of my little open baffle project in the NSB page of the Project Showcase. I use a 1.1mH/10µF on the NSB and just the 8.2µF cap on the tweeter.

You will also meet a little comb filtering off-axis. For a surround, less critical I think. I have a 4 NSB MMTMM center and if dialogue is muddy (usually it sounds like they're mumbling with their head in a box or something) all I have to do is move my head six inches one way or the other and it'll clear right up. Quite interesting, actually.

C

[unknownuser]

Thanks for the input...

So the summary is The tweeter 8.2 uF cap is OK. The Resistor on the NSB Remove and up the L to 1.1mH. If this is what you think I am going to go with it.... Thanks Again

> Well...

> I'm a bit confused by your low value
> inductor on the NSB's, and why you went
> zobel. :)

> At any rate, this is the same drivers and
> same end impedance of my little open baffle
> project in the NSB page of the Project
> Showcase. I use a 1.1mH/10µF on the NSB and
> just the 8.2µF cap on the tweeter.

> You will also meet a little comb filtering
> off-axis. For a surround, less critical I
> think. I have a 4 NSB MMTMM center and if
> dialogue is muddy (usually it sounds like
> they're mumbling with their head in a box or
> something) all I have to do is move my head
> six inches one way or the other and it'll
> clear right up. Quite interesting, actually.

> C



(Originally posted by: joes23)

[cjd]

> Thanks for the input...

> So the summary is The tweeter 8.2 uF cap is
> OK. The Resistor on the NSB Remove and up
> the L to 1.1mH. If this is what you think I
> am going to go with it.... Thanks Again

Well. .6 is what I use on a pair of NSB's (4ohm load) and using it on an 8ohm makes me think the response will be honky sounding - excess output through the midrange/upper midrange. Taking the resistor out increases the slope (but also alters the general shape) and puts the breakup further down. How did you arrive at these values?

It's been a long time since I have modeled this particular driver combination. ;)

You are quite welcome to experiment - just asking questions based on my own experience.

C

[unknownuser]

http://i19.photobucket.com/albums/b191/joes23/NSBResponseGraph.gif

Provided Link: http://i19.photobucket.com/albums/b191/joes23/NSBResponseGraph.gif


I know this will make you shutter with greif but I looked at other designes and guessed.

I know, I know, but this is my first speaker project ( with an undesigned crossover ) and I have to start some where. I just want the NSB's to perform upto but not including the 7k spike....(see attached link) I dont know how to do it.




(Originally posted by: joes23)

[cjd]

Ok.

Then use the values I mentioned. :) 20ga inductors is just fine.

They work on an 8ohm load on the NSB's and a 4ohm on the Onkyo tweets.

C

[unknownuser]

Provided Link: http://i19.photobucket.com/albums/b191/joes23/XoverforNSBspeakerv2.swf


I upped the tweeters by two to now net a 6 Ohm load.... and to get more high end response based on some input. Is the 8.2 uF cap still OK? ( only one 8.2 uF cap on the + lead of the tweeters )

The NSB's I added a .5 mH inductor to my .6 mH inductor and removed the resistor.

How does all this look now?

By the way thanks for your time cjd!!


(Originally posted by: joes23)

[cjd]

> I upped the tweeters by two to now net a 6
> Ohm load.... and to get more high end
> response based on some input. Is the 8.2 uF
> cap still OK? ( only one 8.2 uF cap on the +
> lead of the tweeters )

Nuh uh. It's specific to impedance.

> The NSB's I added a .5 mH inductor to my .6
> mH inductor and removed the resistor.

Hmm. You may have to step to an 18ga inductor for 1.1mH - .6 + .5 just make sure they don't couple. A 1.2mH probably would work as well, just add a smidge of "BBC dip" to the works.

> By the way thanks for your time cjd!!

No problem. Gives me stuff to do at work. ;)

C

[unknownuser]

> Nuh uh. It's specific to impedance.

If it is speific to impedance what cap value should I use not that I am at 6 Ohm?

> Hmm. You may have to step to an 18ga
> inductor for 1.1mH - .6 + .5 just make sure
> they don't couple. A 1.2mH probably would
> work as well, just add a smidge of "BBC
> dip" to the works.

I have purchased a .6mH 18 ga. inductor. I will purchase a .5 mH 18ga. inductor to go with it. If I remember correctly I glue one flat and solder the other one to it standing up? right...?

> No problem. Gives me stuff to do at work. ;)

> C



(Originally posted by: joes23)

[cjd]

> If it is speific to impedance what cap value
> should I use not that I am at 6 Ohm?

Not absolutely sure, but I believe a 5.6µF.

> I have purchased a .6mH 18 ga. inductor. I
> will purchase a .5 mH 18ga. inductor to go
> with it. If I remember correctly I glue one
> flat and solder the other one to it standing
> up? right...?

Why not just grab a 1.1 or 1.2 and have some .6's for a different project? You could, for example, do a version with two NSB's using that .6mH. ;) For surrounds, you know?

C

[unknownuser]

Provided Link: http://i19.photobucket.com/albums/b191/joes23/XoverforNSBspeakerv3.swf


> Not absolutely sure, but I believe a 5.6µF.

I will replace with a 5.6 uF..

> Why not just grab a 1.1 or 1.2 and have some
> .6's for a different project? You could, for
> example, do a version with two NSB's using
> that .6mH. ;) For surrounds, you know?

I will use a 1.1 inductor and save the .6's...

Check out the link for the final final ( yes two finals ) version...

Thanks for your expertise

> C



(Originally posted by: joes23)

[unknownuser]

(Originally posted by: joes23)

[cjd]

You want me to commit?! no way man... nooooo. :P

Yeah, what you have drawn out looks good to me. :)

May still take some tweaking but I think it will do what you want it to do happily.

C

[unknownuser]

No commitment just a nod to say " I think you are on track." I know I will most likley have to play with it.

Thanks for your help Oh Jedi Master!!! :)

> You want me to commit?! no way man...
> nooooo. :P

> Yeah, what you have drawn out looks good to
> me. :)

> May still take some tweaking but I think it
> will do what you want it to do happily.

> C



(Originally posted by: joes23)