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Yamaha NS 1000 woofer issue

lewtex

lewtex

"Remember the Armadillo"
I scored a pair of Ebony NS 1000's this weekend in very good condition with the exception of one woofer.....it does not move at all, not even a micro-inch. I searched this site and got a lot of useful information. After pulling the woofer, I noticed some rust but not too bad.

I need to decide to either try to get it repaired (if feasible), or get a replacement. I was not too impressed with the local speaker repair shop's knowledge (or lack thereof) of this particular speaker and the inherent woofer issues. They suggested a replacement with an Eminence speaker! I understand there is a fellow forum member GordonW that has skill in this type of repair. Any referrals?

As far as replacements, the speaker I have is stamped JA-3058 with 7X0414 also stamped on the back. I did an internet search and found a replacement part number JA 305820 from Yamaha, TigerDirect, Partsolver and PartsStore.
Is this replacement the same as the original? Has anyone used this as a replacement with good results?

My preference is to keep it original, if possible, but I don't want to downgrade the speakers with an inferior replacement.

Recommendations and suggestions will be greatly appreciated.
 
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I'll be watching this thread, I have a pair of NS-1000Ms with a bad woofer as well. I threw a pair of organ speakers in & they sound great, but I really should get them back to stock.
 
The NS-1000's are an acoustic suspension type speaker. You need a replacement driver that was designed for that application. IMHO you really want to replace it with a direct replacement for best results.

Does it look like the magnet has slipped? This seems to be fairly common from what I've read over the years although I have 2 pairs and they're just fine.
 
That peerless is an excellent woofer and would appear to be a good match for the specs of the NS-1000 woofer. However, they are worth a good deal of money, especially the ebony NS-1000s so a replacement woofer might not be the best idea financially, even if you found one that was technically superior.
 
If the magnet has not shifted and a multimeter measurement shows close to 8 ohms of resistance and if you see some rust there is chance you might be able to work the voice coil free from the magnet.
 
Vint Age said:
The NS-1000's are an acoustic suspension type speaker. You need a replacement driver that was designed for that application. IMHO you really want to replace it with a direct replacement for best results.

Does it look like the magnet has slipped? This seems to be fairly common from what I've read over the years although I have 2 pairs and they're just fine.
Click to expand...

What is acoutic suspension?
It can well be that the peerless woofer is superior to the old original Yamaha type. But we will never know.:scratch2:
 
Thanks, folks.

I guess I better re-state my question. I definitely want to keep it original by either fixing the speaker in it or replacing it with an OEM. The part number on the existing speaker is JA-3058, but I have not been able to find a replacement with that exact number. I have found a replacement with the number JA 305820. Is that the same?
 
I would call Yamaha USA or shoot them and e-mail. The ( 20 ) on the end of the part number may be a inhouse addition to the original part number.
 
Helmuth said:
What is acoutic suspension?
It can well be that the peerless woofer is superior to the old original Yamaha type. But we will never know.:scratch2:
Click to expand...

Sealed cabinet. Always replace with original driver. If the bass is lacking, replace your amp.
 
I have no direct proof but I have read it here before that the JA305820 is the Yamaha replacement woofer for the JA3058.

Smart choice to stay with the original woofer. Why change an already excellent speaker. Besides, if you changed one you'd have to change the other as well.

lewtex said:
I have found a replacement with the number JA 305820. Is that the same?
Click to expand...
 
SoCal Sam said:
Sealed cabinet. Always replace with original driver. If the bass is lacking, replace your amp.
Click to expand...

An amp will not "fix" the lack of bass extension on any of the NS-1000 variants. Smallish sealed box with decent efficiency makes deep bass extension an impossibility. It's not an indictment on the quality of the NS-1000, btw, simply a fact that may or may not have to be dealt with depending on your preferences.
 
Well, I took a closer look at the woofer last night. It has definitely shifted off center.....most likely the cause of the problem. I hope it can be repaired, that's the direction I'm heading. Fortunately for me, there is a fellow forum member in the same locale who has experience in this type of repair. Stay tuned..............
 
Sorry to hear that. From your description I sort of thought that's what might have happened. There are some fairly detailed magnet re-centering threads complete with pictures out there if you do a search.

Here's a good one from a fellow AKer. (thank you scootchu and Ray W.! :thmbsp:)

http://www.audiokarma.org/forums/showthread.php?t=202963

The problem is obviously not unique to Yamaha woofers.

lewtex said:
It has definitely shifted off center.....most likely the cause of the problem.
Click to expand...
 
Thanks, Vint Age.

I did a search, but did not come across the one in your link. Excellent DIY on magnet shift.
 
SoCal Sam said:
Sealed cabinet. Always replace with original driver. If the bass is lacking, replace your amp.
Click to expand...

Good advice. Those acoustic suspension woofers need an amp with strong bass to move them correctly, but once you have a good match, the bass is excellent. We get so used to hearing cabinet resonances and such that it takes a bit of getting used to accurate, tight bass. But that is what the NS-1000s give you. There is NO bass, until the bass is there in the music; then there is BASS, but only as much as, and for as long as, there should be.

dnewma04 said:
An amp will not "fix" the lack of bass extension on any of the NS-1000 variants. Smallish sealed box with decent efficiency makes deep bass extension an impossibility. It's not an indictment on the quality of the NS-1000, btw, simply a fact that may or may not have to be dealt with depending on your preferences.
Click to expand...

Deep bass EXTENSION, perhaps... but not tight, accurate bass sound. But producing that bass with that kind of monitor requires an amp with enough "oomph" in the bass.

lewtex said:
Well, I took a closer look at the woofer last night. It has definitely shifted off center.....most likely the cause of the problem. I hope it can be repaired, that's the direction I'm heading. Fortunately for me, there is a fellow forum member in the same locale who has experience in this type of repair. Stay tuned..............
Click to expand...

Glad to hear you found the source of the problem. It seems to be the most common breakdown/flaw with these speakers: the glue used to hold on the woofer magnets dries over time, making them susceptible to magnet shift if dropped, etc... I've thought of pulling the woofers on mine and adding some epoxy as a preventive step (while the magnets are still in alignment!), but it seems that as long as the speakers just sit there, the risk of a shift is minimal. Magnets usually shift during transport/shipping of the speakers.
 
I agree, it's probably the right thing to do but like you I haven't done it yet. Hopefully we won't live to regret it. :D

Arkay said:
I've thought of pulling the woofers on mine and adding some epoxy as a preventive step (while the magnets are still in alignment!), but it seems that as long as the speakers just sit there, the risk of a shift is minimal. Magnets usually shift during transport/shipping of the speakers.
Click to expand...
 
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