Troels NOMEX 164: any thoughts - diyAudio
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Old 9th November 2012, 07:18 PM   #1
satx is offline satx  United States
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Default Troels NOMEX 164: any thoughts

Hi,
This is my first post here even though I've been reading for a long time. I just wanted to get anyone's thoughts on the NOMEX 164 2.5 way by Troels Graveson. I am ready to buy all the pieces to build it, but now that I have really priced everything including all components with Jentzen air coils and standard-z caps, veneer, damping and odds and ends, the price has gotten pretty expensive. I'm guessing about $900 when I'm all said and done. So my question is, is it worth it?
I'm currently using kef iq5's with a Peachtree Nova and I want a noticeable upgrade in clarity, sound stage, ambiance and richness.
Am I barking up the wrong tree with these at this price? The price is OK, but not without noticeable improvements.

Thank you all in advance

Evan
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Old 9th November 2012, 10:10 PM   #2
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Hmm,
Its a solid enough design, by a solid designer, but it wouldn't be my first choice. Have a look at one of zaph's designs or some of the offerings on htforums. I somehow feel troels heart isn't in this one. Could just be cause he loves the high efficiency designs ( and rightly so in my humble opinion!)
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Old 9th November 2012, 10:30 PM   #3
satx is offline satx  United States
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I have looked at Zaph's designs and many, many others! I did wonder if his heart was in these also because he sometimes seems to have put a lot more effort into some others, but I have seen him recommend them for a reasonably priced, detailed speaker. I guess I picked them because I was interested in the 2.5's over a 2 or 3 way or mtm. Some of that is looks + sensitivity over the 2's.
Anyway's, I emailed him and he recommended them for my needs, but I just wanted to get some outside opinions. Plus his answers are very short and tuff to understand in the context of my original emails.
I guess I was wondering what I should shoot for to exceed the kef's in the areas I mentioned. They are not bad, but they are not very rich, sometimes a little grainy, sound stage just OK and sometimes shouty.
What level (price?) of diy speaker to look at to improve upon these.

Cheers,
Evan
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Old 9th November 2012, 10:30 PM   #4
cotdt is offline cotdt  United States
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Go ahead and build it. The Nomex units sound great. I've used them. If you have the right room for the way he tunes his crossovers, it will sound superb.
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Old 9th November 2012, 10:32 PM   #5
6L6 is offline 6L6  United States
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For those not familiar with the project, it can be found here -

PEERLESS-NOMEX-164

I don't think that his heart isn't in it -- I think he is a great engineer and this is a very good design within the paramaters he had. 2.5 way speakers are not for everybody due to their low impedance. However the Nova will drive them with gusto so that shouldn't be a concern for you.

The real question is this - are you wanting to build these for an improvement to your system, or to learn something along the way? (Or both??) If you are interested in the adventure, then it (or anything, actually) will be a fine project!

Also remember the 4 to 1 ratio of the DIY project. The finished project would probably cost 4x your parts if you were to purchase them at retail. You will be building a $4000 pair of speakers, designed by a very experienced engineer, using quality drivers and parts... They will sound great!!

Last edited by 6L6; 9th November 2012 at 10:40 PM.
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Old 9th November 2012, 11:23 PM   #6
satx is offline satx  United States
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cotdt-
By the way he tunes his crossovers, I assume you mean a bit laid back? My room is 22' X 14' X 9' with carpet and a lot of glass on the same wall as the speakers and a large window to the right and above the right hand speaker. I do sometimes put acoustical panels over the windows directly behind the speakers.

6L6-
I am wanting to build them for an improvement and for the experience. I could go buy a different pair of speakers and be done with it, but I will enjoy them more knowing that I built them. As for the improvement, I just don't want to spend a grand and all the time and not be happy. It's nice to hear that you think they will be nice either way.
I assume, based on the measurements he provides they should be at least decent? I know what the graphs mean and how to read them, just not how that correlates into how they will sound.

Evan
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Old 10th November 2012, 12:20 AM   #7
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I think Troels gets a little carried away with crossover parts sometimes. I wouldn't be afraid to use p-core or super Q inductors and much cheaper poly caps. I didn't do the math/shopping, but I think that would knock off quite a lot. Looks like the drivers are about $375.
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Old 10th November 2012, 12:29 AM   #8
satx is offline satx  United States
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Yes, that probably could knock-off a good amount. I did decide on standar-z over superior-z, that's about $120 right there. I was just afraid of losing smoothness. I would certainly be open to alternatives if make much difference. Can you name some brands I should look at.

Thanks
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Old 10th November 2012, 12:49 AM   #9
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For the time being, these are a bargain:
AXON True Cap Metallized Polypropylene Capacitors
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Old 10th November 2012, 01:17 AM   #10
cotdt is offline cotdt  United States
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Yeah your room seems large and dampened enough. Just keep the speakers away from the walls. His tuning does seem a little laid back based on the graphs, but most people prefer such sound. His crossover point is quite high. I've only tried these Nomex units crossed at 2kHz to the HDS tweeter (which has a rising response) while he uses 3.2kHz with a more laid-back tweeter. But you can tweak the crossover to get the balance that you like, by leaving out R1061 for a flatter frequency response.

I do think the crossover caps make a difference. I would use metal-core inductors to save space and cost. You don't need 10W resistors, more like 2W.
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