Hi, not new to home theater video, but definitely new to speakers. I bought a pair of Yamaha NS-515Fs from Craigslist for 100 bucks, he said that he used them and they were good to go, I didn’t have the opportunity to test them, seemed like a decent deal and they both looked good. Got them home and it seems as if one of the tweeters is busted. I switched the tweeters and the other works fine in the enclosure, so I’m guessing it’s nothing with the board. Anyway, I’m kind of out of luck trying to find tweeter replacements. I found NS-525 tweeters that look the same on the front, but they look to be just the diaphram? (I don’t know what I’m talking about there) The tweeter I have is a full enclosed module. Not sure where to start... any help is appreciated. The stamp on the back of the tweeter is x3470A0. Thanks
Yes, called them today and they couldn’t really help. It must be an oversees model. I did find a site that listed it as backordered and am rolling the dice by buying one to see if it ships, I doubt it though.
I guess next step is to repair or buy another similar sized set. I know that I need to look at frequency range; but other than impedance and wattage is their anything else I need to know to make sure it’s compatible with the existing crossover board?
Going a little crazy trying to fix this. I’m determined. I have taken it apart and there is a break in the voice coil. Trying to find a 1” coil that is 6 ohms. What would be the impact using an 8 ohm coil? Thanks
Hi, I know that this is quite a while ago, but how did you go with this repair?
I bought a NS-C515 with dead tweeter and also noted that the NS-C525 looks very similar, but the tweeter on this is quite expensive so do not want to throw good money after bad money.
The tweeter for the NS-525F is still available new, but these are very expensive when compared to the value of the speaker itself - they are around AU$130 each.
In my case, I managed to repair the tweeter on the NS-C515 performing some micro surgery in repairing the voice coil and even after quite a bit of testing it was still perfect.
That tweeter looks a lot different to the unit on the NS-515 - on the NS-515 the shielded magnet was bigger than that on the NS-555 tweeters. This seem to have almost no magnet at all? The part number is correct though.
Unfortunately with no tweeter dome, there is no point in repairing the voicecoil if it was in fact open circuit, as the dome is the part that reproduces the sound. Whoever said these tweeters were sounding fine at time of sale must have hearing in a range where other mere mortals do not.
For the benefit of others who might be considering using the NS-555 tweeter as a retrofit, herewith some pictures of the original tweeter front with the protective part of the front cover being removed, exposing the tweeter dome which will allow the tweeter to be fitted flush against the back of the original tweeter's mounting plate.
As this was just for illustration purposed, the cutting process has not been finished, but one should be able to get the idea.
Also, make sure that the hole in the cabinet will accomodate the front plate of the tweeter. The diameter of the circular section is 105mm and the two straight parallel sections are 82.5mm apart and 65mm long each.
The suspension on the tweeter is fixed to the tweeter body and so are the connections to the voicecoil, so you would have to attach the bulk of the tweeter to the back face of the original body. Also remember that there is quite a big shielded magnet behind the tweeter, something which you do not seem to have on the original.
I am not sure whether the hole in the cabinet is big enough to allow the magnet to fit through that. The magnet has a diameter of 79mm and is 30mm high from the back of the NS555 tweeter.
Hey all, interestingly enough, I just was going to try a 2nd revision of my repair on this and found my old original post.
My repair was to get a tweeter dome and coil off of eBay. It had an 8 ohm resistance, so it definitely wasn't ideal. However, the coil fit the magnet so I swapped it out. Unfortunately there is distortion on the tweeter now. I'm guessing it was the right approach but the cheap Chinese come/coil is the problem. I also had to glue the tweeter to the mounting plate which also might be the issue, I've put up with it for the last 3 years but still would like to get a better solution. Tweeter Dome
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