DIY NS10

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Mr.Franky

Active member
Joined
Oct 10, 2011
Messages
36
Hey,


I am planning on building my own NS10 monitors. The woofers and tweeters are easy to find. But, since I don't know a lot about electronics, I'd love to get some help with building the crossovers. The building seems easy, but it's researching the components that I'm not too sure about.

You can see the schematic and a picture of the original (?) crossover in the links below :

http://forum.analogconsole.com/images/ns10_schematic.jpg

http://forum.analogconsole.com/images/ns10_crossover.jpg

Now, for capacitors i was thinking about these :

http://www.parts-express.com/pe/pshowdetl.cfm?&Partnumber=027-918&scqty=6

http://www.parts-express.com/pe/pshowdetl.cfm?&Partnumber=027-932&scqty=4

Now the hardest part for me is to find the correct crossover inductors..
Could anybody suggest me the correct inductors ? The schematics doesn't give much information. The only extra information I found about the inductors was this :

L1 40mm dia 25mm high core 1.715mH 0.6R DCR
L2 28mm dia 20mm high core 591.4uH 0.6R DCR


If there is any other advice, please feel free to reply !


Regards,
Mr.Franky
 
Well, I don't know a lot about electronics. I read several threads and websites where a majority of people agreed that higher quality caps and inductors would be better than the standard 'crappy' components as they called them. Even if it's theoretically better, the sonic difference would be the same or better they said. You seem to disagree ?


Cheers !
 
Indeed, I'm surprised there are no DIY NS10 kits available. But does anybody have any advice on the inductors ?
 
I was thinking about this inductor : http://www.parts-express.com/pe/pshowdetl.cfm?&Partnumber=255-106&scqty=2
as replacement for the original L1 40mm dia 25mm high core 1.715mH 0.6R DCR

Would that be a good inductor ?

For the second inductor (L2 28mm dia 20mm high core 591.4uH 0.6R DCR) I don't really find a matching inductor. I found a Jantzen Ferrite core inductor with an inductance value of 0.68 mH where the schematic says to use a 0.6 mH inductor. Is this close enough ? You can find more info about the seconds Jantzen inductor here : http://www.diyparadiso.com/price/jantzen%20p%20coils.htm

Do I only have to make sure the inductance value matches with the value on the schematic ? Or are the dimension, woundings, awgs, etc also very important ?


Greetings
 
hey , thanks for the reply.

What if I just bought this crossover : http://www.gotron.be/jb-systems-2-weg-scheidingsfilter-200w-2khz.html instead of making the crossover myself ? Wouldn't the results be the same ?


cheers
 
Are you set on the NS10s?  Look around and you will find very differing opinions about what a crappy speaker it is. Have you ever mixed on a pair? Here is the frequency response chart http://media.soundonsound.com/sos/sep08/images/yamahans10fig4_l.jpg  Not exactly the flattest thing in the world is it?  On the other hand that peak in the midrange makes you be very careful there.There was a mod available on the net to get rid of that nasty  peak but the page that it was on has disappeared. 

If you want to DIY a studio monitor and you can get any more info on the NS10, you might want to look at these.  I haven't heard these, but I have heard about 4 or 5 other designs that this guy has done.  They definitely have a much flatter frequency response than the NS10s  https://sites.google.com/site/undefinition/hitmakers
 
Mr.Franky said:
hey , thanks for the reply.

What if I just bought this crossover : http://www.gotron.be/jb-systems-2-weg-scheidingsfilter-200w-2khz.html instead of making the crossover myself ? Wouldn't the results be the same ?


cheers

The results would definitely NOT be the same. 
 
OK then.  The originals had pretty cheap components in the crossover.  The Capacitors were NPE (non polarized electrolytics)  The capacitors the you linked to would definitely be an upgrade.  You don't need them rated at 400v you would do fine at 250.  From the picture of the crossover they are rated at 160v.

Give me a minute and I will put together a parts list for you.
 
http://www.parts-express.com/pe/showdetl.cfm?partnumber=027-416

http://www.parts-express.com/pe/showdetl.cfm?partnumber=027-428

http://www.parts-express.com/pe/showdetl.cfm?partnumber=255-234

http://www.parts-express.com/pe/showdetl.cfm?partnumber=255-106

Those should do the trick, the dcr (direct current resistrance) might be off a little on the inductors, that might make a dB or so difference in the levels of the two drivers, but it shouldn't be enough to make that much of a difference.  I'm guessing that the inductor on the tweeter section would have been air core and the one on the woofer would have been iron core to keep the price down.  The air core inductors induce less distortion into the system, but in larger values they get pretty expensive and the distortion is less noticeable in the woofers.  Also having an iron core lowers the dcr because you need to use less wire.
 
Mr.Franky said:
:

L1 40mm dia 25mm high core 1.715mH 0.6R DCR
L2 28mm dia 20mm high core 591.4uH 0.6R DCR
\

Where did you get these numbers from? I just took the ones from the schematics.  Remember, originally this was a failed consumer speaker.  I'm guessing that those are the measurements that someone took from theirs?
 
Eric Best, are you saying to match the DCR of the two inductors as closely as possible to one another ? So it would be better if the ferrite core inductor had a higher DCR (which brings it closed to the air core inductor's DCR) thus a smaller AWG ?

EDIT: what I'm trying to ask is :

Should I get the AWG as big as possible (and the DCR as low as possible) or should I get the DCR as close to the 0.6DCr as possible or should I get both inductor's DCRs to be as close as possible to eachother (like O.26ohm on L1 and 0.23 on L2) ? Sorry for the bad explanation, my english is not very good.
 
Eric Best said:
Are you set on the NS10s?  Look around and you will find very differing opinions about what a crappy speaker it is. Have you ever mixed on a pair? Here is the frequency response chart

Blah, blah, blah.

Please send all those crappy NS10's my way.

The whole point of NS10's isn't to have great frequency response.

It puts a magnifying lense on the most important part of your mix, the mid-range.

Contrary to internets myth, they can sound quite good with the proper amplification.

It's a very useful tool in the toolbox.

Good luck with your build!

Regards,
Mark
 
With the amount those measurements differ from that schematics it shouldn't make that much of a difference.  The typical electrolytic capacitor they used in the original had at least a +/- 10% tolerance, going with the more expensive capacitors you cut that down to 5%, the inductors you are looking at have a +/- 5% tolerance which mnats measurements fall into.  The only thing that doesn't make sense to me is his dcr measurement.  Usually a solid core inductor will have a lower measurement than .6 it will usually be between .1 and .2.
 

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