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Old 11th April 2012, 04:49 PM   #1471
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Anybody see the 3015lf is back to $199 from PE? Picked up a few and will give this box a try.
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Old 12th April 2012, 02:44 AM   #1472
col is offline col  Australia
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That is interesting as I thought the previous price increase was a reflection of global neodymium prices.
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Old 12th April 2012, 07:22 AM   #1473
djk is offline djk
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Neo peaked in June of 2011 and the price has dropped a lot, 50% since November.
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Old 12th April 2012, 01:02 PM   #1474
jbell is offline jbell  United States
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There was also a bit of speculating going on... I don't think wholesale went above $179, when they were asking retail $299....

Now it's $160 wholesale with a PE retail of $199...

So the "speculation" of how high Neo is going to go -- is out of the market as well.
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Old 12th April 2012, 08:20 PM   #1475
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Quote:
Originally Posted by djk View Post
Neo peaked in June of 2011 and the price has dropped a lot, 50% since November.
Although neodymium has dropped, dysprosium, used to make neodymium magnets heat proof has gone way up in price, making the net cost for neo speaker magnets static.

Without dysprosium, the neo would loose it's magnetic strength at high drive (heat) levels.

Dysprosium is still going up, and is very difficult to extract.

We are not going to see cheap neo for some time (if ever), JBL has stopped making the neo SRX line and has replaced it with a ceramic magnet series.

Art
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Old 13th April 2012, 12:15 AM   #1476
col is offline col  Australia
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P.Audio have even put up some marketing blurb on their website:

"Got the Neodymium Blues?
We’ve got the Cure

No doubt about it, Neodymium is a great material for compression driver magnet structures. Low weight, extremely high energy and superior bandwidth all combine to make Neodymium based permanent magnets the material of choice. Unfortunately, the price of Neodymium has increased to the point where it’s even difficult to purchase.

At P Audio we saw this trend coming and invested many hours in optimized ferrite designs. We’ve even added alternate and lighter weight material in sections of the magnetic circuit where very little magnetic energy was focused."

blah....
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Old 13th April 2012, 02:46 PM   #1477
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Is marine ply worth the cost of upgrade?
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Old 13th April 2012, 02:50 PM   #1478
Mark Kravchenko --- www.kravchenko-audio.com
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Quote:
Is marine ply worth the cost of upgrade?
Intelligent use of bracing and construction methods are worth far more than a plywood with waterproof glue. That is the claim to fame of Marine grade plywood versus void free Baltic birch plywood.

But I have built many a cabinet out of poplar, and even OSB and they all work well when applied intelligently.
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Old 13th April 2012, 03:13 PM   #1479
tb46 is offline tb46  United States
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Hi paperman,

See this thread, Post #477.

Regards,
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Old 15th April 2012, 01:37 PM   #1480
Sjpaul is offline Sjpaul  Scotland
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Default PD154 suitability?

Hi all,
New here, so I have way less experience in the design and build side of things but have been looking for a project to use a pair of Precision Devices PD154 drivers that are awaiting reconing...

Does anyone have an opinion on the suitability of these drivers for the single sheet 15 box?

Here are the T/S parameters:

Fs 39Hz
Re 6.2 ohms
Qts 0.205
Qms 4.32
Qes 0.216
Vas 149 litres
Mms 125 grams
Sd 890 cm^2
Cms 133uM/N
Bl 29.65 T/m
Xmax 7.7mm
Vd 0.658 litres
Ref efficiency 3.94%

Thanks in advance....
Steven.
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