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Author Topic: Wanted: Yamaha NS1000 tweeters & midrange drivers  (Read 2955 times)

Shonver

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Wanted: Yamaha NS1000 tweeters & midrange drivers
« on: October 22, 2007, 03:41:43 pm »
I'm looking for drivers for this model (tweeters & mids), and any other parts you may have.
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Timber_MG

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #1 on: October 22, 2007, 03:54:43 pm »
Someone bitten the berylium bug? Perhaps hennie might know.
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Shonver

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #2 on: October 22, 2007, 03:59:20 pm »
Hehe. Yes, I want to play...
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Hennie

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #3 on: October 22, 2007, 04:33:59 pm »
I'm sure you just want to build a new speaker with those drivers...

I read somewhere that restrictions on the export of Beryllium from Japan due to toxicity concerns eventually sunk the NS1000. These restrictions apparently do not apply to replacement drivers for the NS1000. These should still be available from your friendly local Yamaha agent....

I also once saw a pair in working condition advertised by a studio for R5k which is a bargain.

PS: When I sold mine the L-pads for level adjustment were not making solid contact anymore.
« Last Edit: October 22, 2007, 04:36:52 pm by Hennie »
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Shonver

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #4 on: October 22, 2007, 08:51:54 pm »
I am restoring a pair right now. Got new tweeters on order, but can't afford new tweeter & mids for a DIY project. Basically want to make an NS1000 that images well, with some LF extension. Will require new enclosure with low diffraction baffle, acoustically aligned, symmetrically mounted drivers and transient perfect crossovers. Also will probably go with 2 x Extremis 6.8 drivers IPO the 12" Yamaha driver....

...if I can find the drivers....

PS- the pots in these speakers are also not at their best.
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Hennie

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #5 on: October 22, 2007, 10:23:59 pm »
I think you are on the right track. I experimented with mine before restoring it to its original condition and selling it.

Some worthwhile changes I can recommend:

Much narrower front baffle with roundover on the edges - W.r.t the width of the original baffle - speakers with that baffle width do not image well - the image does not detach from the box, not sure why. A narrow baffle imaged much better and was also smoother presumably due to reduced difraction. Here the image did detach from the box and hung in space.

BSC - It has no BSC and needs placement against a wall. BSC allows more space around it and gives better imaging.

Paper cone bass driver - really stiff, tight alignment (fast bass!!!!) but some upper bass colouration from the undoped paper cone. I did not do that at the time, but I would seriously contemplate metal cone bass drivers for a timbre match with the Be.

Although it has a very substantial cab some cab colouration was evident, probably due to the neutrality of the Be drivers. I think one can do better here. Because of the quality of the Be drivers, a dual layer sand filled cab may bring pleasant surprises....if u can live with it. I used 30mm marine grade ply with vinyl tile damping and heavy bracing for some improvement. But with choral works you could still hear the cab sing...

PS: I also tried an open baffle which was sublime. Ultimately I did not have the space for it.


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Shonver

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #6 on: October 23, 2007, 09:43:58 am »
Quote from: Hennie on October 22, 2007, 10:23:59 pm
Paper cone bass driver - really stiff, tight alignment (fast bass!!!!) but some upper bass colouration from the undoped paper cone. I did not do that at the time, but I would seriously contemplate metal cone bass drivers for a timbre match with the Be.

I have long been eyeing the drivers from Lambda->Stryke Audio-> Acoustic Elegance/AE Speakers. Lambda designed some drivers that had very low distortion and wide bandwidth. When they dissolved, John Janowitz bought the balance of their stock (and I assume the IP). But he has been struggling to get things going. If he gets it right, I'm bound to be one of his customers. Not sure if the line will include metal-coned drivers, though.

Thanks for the tips.
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Timber_MG

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #7 on: October 23, 2007, 12:49:11 pm »
Personally I'd put in some really nice pro-sound 8" drivers, the kind with a stiff paper cone, very low distortion and resonable damping for the frequency range involved.

For that kind of driver compliment I would also stronly considder a sand-filled cab construction or something completely tricked out.
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Hennie

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #8 on: October 23, 2007, 01:15:08 pm »
Overall system sensitivity was about 91-92 dB/2,83V with the L-pad attenuators in centre position. I guess naked Be driver sensitivity should be about 2-3dB more.

Stiff paper cones? BMS? Triple shorting ring motor...

With most pro 8's a sub is needed. But that's a good idea, since the woof must be good up to about 700Hz, and burdening it with high excursion @ 30Hz may muddy the midrange. The Be drivers are actually of very low distortion, i.e. < 0.3% @ 1W (if that is important at all..)

For the wider cab that an 8 requires, maybe foam absorption on the sides of the mids and tweets? I found that definitely makes a difference. As for aesthetics, blindfold the wife.

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Shonver

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #9 on: October 23, 2007, 01:17:36 pm »
Gents, I appreciate your input. But do you reckon you can ask around about those Yamaha drivers for me? I need that first. I'd really appreciate it if I could find them somehow. The NS1000 seems to be such a well-revered speaker that I came up against a lot of resistance on another forum where I dared to suggest that it could be improved. With such staunch fans, I don't expect to find the parts easily.
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Shonver

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #10 on: October 23, 2007, 01:20:49 pm »
Quote from: Hennie on October 23, 2007, 01:15:08 pm
Overall system sensitivity was about 91-92 dB/2,83V with the L-pad attenuators in centre position. I guess naked Be driver sensitivity should be about 2-3dB more.

Quote from: Hennie on October 23, 2007, 01:15:08 pm
With most pro 8's a sub is needed. But that's a good idea, since the woof must be good up to about 700Hz, and burdening it with high excursion @ 30Hz may muddy the midrange. The Be drivers are actually of very low distortion, i.e. < 0.3% @ 1W (if that is important at all.

Yup. A driver that extends lower is bound to be less efficient as well.

Edit:

Not to contradict the pro sound driver proposal, but now those Dayton RS drivers are stating to look tempting...
« Last Edit: October 23, 2007, 01:23:33 pm by Shonver »
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Timber_MG

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #11 on: October 23, 2007, 01:46:34 pm »
They may well  work, but remember the cost of crossover for something with low impedance that has to be tamed a bit lower.

There are a couple of nice 8" pro-drivers around at the moment from both sides of the atlantic.
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Hennie

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #12 on: October 23, 2007, 02:07:52 pm »
« Last Edit: October 23, 2007, 02:13:09 pm by Hennie »
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Shonver

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #13 on: October 23, 2007, 02:47:07 pm »
Hennie

That's where I got the new tweeters from for the restoration project. I need to get some used units for lower cost for the project under discussion, though (did you see the price of new mids?).
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Timber_MG

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Re: Wanted: Yamaha NS1000 tweeters & midrange drivers
« Reply #14 on: October 23, 2007, 02:58:29 pm »
I was expecting much worse. Compared to Be compression drivers this thing is comparatively reasonably priced. I mean what does a Scan mid cost thesedays?
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