NSB Speaker *PIC*

[unknownuser]

Provided Link: http://i19.photobucket.com/albums/b1...overforNSB.gif


Ok guys... all input is welcome!!

Xover to the speaker layout.

What do you think?

Thanks


(Originally posted by: joes23)

[unknownuser]

Provided Link: http://i19.photobucket.com/albums/b1...kyoTweeter.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]

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...products_id/22">http://www.billfitzmaurice.com/plans...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]

Provided Link: http://i19.photobucket.com/albums/b1...ponseGraph.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/b1...Bspeakerv2.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/b1...Bspeakerv3.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)