Yamaha NS 1000 Crossover Rebuild

[afs909]

Around a year or so ago I purchased the parts for multiple crossover rebuilds for a few sets of speakers I have. A couple of weeks ago I finally finished the rebuild for the pair of NS 1000.

I started with an old set of Sansui S50 that I bought new in 1982. Replacing the old electrolytic caps with new ones. They sounded louder but I'm not sure they were really that better. Then I rebuilt the crossovers on a set of Acoustic Research AR94 and replaced the foam surrounds. The improvement in clarity was worth the effort so I moved on to my two sets of Mission speakers, 753 and 753F. This time the results with mostly film caps was excellent. Now having completed the Yamaha NS1000 speakers I'm very much impressed with how the Mundorf film caps sound.

 

The first time I pulled the xover out of the Yamaha I though "Well, this is going to be interesting".

 

I did some research on how hard this would be and found it was going to be a fair amount of work. Pulling it apart wasn't easy at first until I thought of an easier way of removing those 6 x 3.5uf caps. I mounted the xover into the speaker upside down to hold it securely and then used vice grips to twist the cap as I was heating the base surround with a hair dryer.

 

 

 

 

I also decided to replace the old connectors with new banana terminals. I found that the old connectors weren't going to make it easy to use the old plastic plate. A search on the interwebs made it clear no one was making these without selling the banana plugs with them for like over $50 each. So I designed the plates and printed them.

 

 

Next I had to figure out how to fit all these rather large caps onto the board.

 

 

I finally decided that it could be done and a short time later...

 

Then it was time for a coffee and relax while listening to my favourite artist.

 

Thanks for reading this. Cheers.

[Cloth Ears]

What's the verdict?

[afs909]

Put it this way. I was thinking of selling them but now I'll keep them. They sound fantastic to me, not as much bass as my AR9s but very pleasant to listen to. Clear and distinct. Worth doing.

[oukouk]

Hi Adrian,

 

I went down the path of upgrading the crossover of the NS1000m as well.. and went a bit further than just replacing the capacitors.. Basically rebuilt the crossover from scratch with new parts..  I did remove the attenuators though.

 

From what I hear before the upgrade - I will not say that they are bass shy.

And after the upgrade - the SQ just jumps a few notches up. - completely worth the effort.

 

I'm glad that you are keeping them.. 

 

(My favorite speakers are AR9s..)

 

 

 

 

[petarst]

Hi,

 

I want to do the same. Is it possible to give me part list that i have to order? Thank you !

[Ian McP]

Troel Gravesen's redesign of the crossover, plenty of background info here

http://www.troelsgravesen.dk/Yamaha-NS1000.htm