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Old 22nd March 2013, 12:31 PM   #31
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Quote:
Originally Posted by Hibernator View Post
Howdy y'all,

I'm a little late to the party, but am finally getting around to unpacking the big box of drivers I bought around 2007 from somebody on the East Coast selling on eBay dirt cheap.

Recently I found all the NHT sale threads and Jack Hindley's spreadsheet, so I don't know whether I got lucky and part of the sale or what, but it seems I have the following laying around:

- 10 6.5" Foster woofers from the 3.3 and 2.9
- 10 4 inch shielded drivers, appear to be from AC2 and thus the same as in the 3.3 and 2.9
- 5 tweeters I thought were Superseries tweeters, but they look like the tweeter in my AC1 and have a sticker on the back that reads "050/1 2101 NORWAY".
- 1 NHT 1259 is in the mail right now, and I have 2 new 10 inch NHT woofers (might be VT-2 replacements, but the number is not-11-125-1 so it doesn't match Jack's spreadsheet)


I would like to build myself a 3.3 clone. Since NHT 1259s are a little, umm, "hard to find" and I only have 1, I was thinking of trying to make it more of a 3.3 sat with a single 1259 sub or maybe using the other 10 inch woofers if I can find out a little more about them.


I've seen the VR-3 threads and found the plans for them as well as a (partial?) cabinet drawing for the 3.3 and a XO schematic. I was planning to use a Behringer active XO, because I am a little out of my swimlane when it comes to electronics at the moment.

Has anybody else made a 3.3 or 2.9 mid/high sat and have any advice to offer?

Is there a 2nd page to the 3.3 cabinet schematic? There are references to detail drawings and the various measurements don't all add up (overall height is 48 inches, but I added it up to be 48.883). To be fair, reading schematics isn't my day job and I could be way wrong here. Do the two mid range woofers have separate chambers or share one open volume space (this may be a dumb question to a seasoned speaker builder, sorry if it is)?

If I build the sat/sub config, is the 21 degree angle on the front no longer relevant as long as I simply point the sats at the listening position using the correct angle?

And while helping out could also be offers to take the drivers off my hands and help me clean out my garage, I will have to ever so graciously decline ...
Just give me you P.M and I will send you pics ( step by step ) of the construction of the 2.9
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Old 22nd March 2013, 12:57 PM   #32
The Dastardly Dad of Three
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Folks, I know that this is not LS related BUT it is connected to the NHT surplus era. Does anyone here still have unused (but working) audiophysics class d amp modules from that time ? I have a NHT Deqx box that is short one working channel but no where to go !
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Old 7th April 2013, 05:22 AM   #33
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Sorry been away for a while, but stumbled into a great find the day I came back home. Knocked $100 off the asking price because one of the 6.5 inch woofers was silent, but I have spares and figured based on Sy's and Jack's comments it was likely in the crossover anyway. I've been waiting so long to get a pair, I wasn't going to let that stop me.

Sy, I know you'll recognize this picture in your sleep ... just wish I hadn't spent 45 minutes trying to get the 12 inch woofer out before wondering "how did Sy do that?" and re-reading your pages.

A 100uF, 50V capacitor from Radio Shack is connected in there temporarily until I can reach the NHT support folks (hopefully they still have some old stock parts) or someone else can point me to where I can find a 92.5 uF NP electrolytic capacitor. Bottom line though: The lower-mid is again functional!!! All I can say is thanks Jack and Ken and the rest of the team that created these beasts - unbelievable! I had no idea. I've never heard anything even remotely close to this good - and I don't mean to be knocking the two pairs of VT-2 speakers I own. Even with one dead low-mid woofer it was clear I had entered a new realm of sound quality.

I will still continue with the cloning project, but am finding out rather quickly that sourcing the XO components is only slightly harder than getting Mr Spock to be emotional ... or at least I'm obviously looking in all the wrong places. The only places I know to look at Mouser and Digikey and as a relative newby in electronic circuits I can't say for sure I'm right, but it seems like they don't carry even one single component that matches the 3.3 crossover spec sheet. I must be missing something here, but I have no idea. I might have to settle for an active XO approach in the end.
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Last edited by Hibernator; 7th April 2013 at 05:43 AM.
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Old 7th April 2013, 05:33 AM   #34
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Sorry, double post
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Old 7th April 2013, 05:45 AM   #35
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Originally Posted by cotinus0 View Post
Hi,

I've built the 2.9. If you send me your email address, I will send you pics ( step by step )

on how I built them; the hardest part being the cabinets of course. I'm now up for building the 3.3

Attachment 337757
WOW! Awesome!!!

Is that a wood veneer or did you use solid wood construction? It looks fantastic.
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Old 7th April 2013, 09:09 AM   #36
SY is offline SY  United States
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Quote:
Originally Posted by Hibernator View Post

A 100uF, 50V capacitor from Radio Shack is connected in there temporarily until I can reach the NHT support folks (hopefully they still have some old stock parts) or someone else can point me to where I can find a 92.5 uF NP electrolytic capacitor.
You can build it up out of smaller values- it will help to have a capacitance meter since electrolytic tolerances are, ummmm, generous.

These are truly great speakers, even before the mods. When I first got mine fired up, I spent a few hours playing with the setup and got them singing- it really is worth the time to really get all the distances and angles locked in. The dynamics and the precision of image and soundstage are what really hooked me.
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Old 7th April 2013, 11:13 AM   #37
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Quote:
Originally Posted by Hibernator View Post
WOW! Awesome!!!

Is that a wood veneer or did you use solid wood construction? It looks fantastic.
Thanks! Yes this is wood veneer. As I said, I'm up for cloning the 3.3 ( got all the original drivers and Xovers bought on Ebay ) However the cabinet drawing on SY site confuses me quite a bit. I can see on this pic that the side or part of it has a backer board just as well... Is it a 3/4 or 1 inch thick ? Same dimension of the one the one in the back ( 13.5 x 13.5 ) ? The separator boards should'nt the be 5 inch wide instead 7. Do both of these separators have 3 openings ? Would be very grateful if you could provide me with these informations ( while your cabinet is still opened ). Finally I replaced all my NP electrolytic capacitors and agree with SY have a capacitance meter handy when buying them. Yes their tolerances may sometimes exceed 10%...
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Old 31st May 2013, 03:12 PM   #38
PB2 is offline PB2  United States
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Quote:
Originally Posted by Hibernator View Post
A 100uF, 50V capacitor from Radio Shack is connected in there temporarily until I can reach the NHT support folks (hopefully they still have some old stock parts) or someone else can point me to where I can find a 92.5 uF NP electrolytic capacitor. Bottom line though: The lower-mid is again functional!!! All I can say is thanks Jack and Ken and the rest of the team that created these beasts - unbelievable! I had no idea. I've never heard anything even remotely close to this good - and I don't mean to be knocking the two pairs of VT-2 speakers I own. Even with one dead low-mid woofer it was clear I had entered a new realm of sound quality.

I will still continue with the cloning project, but am finding out rather quickly that sourcing the XO components is only slightly harder than getting Mr Spock to be emotional ... or at least I'm obviously looking in all the wrong places. The only places I know to look at Mouser and Digikey and as a relative newby in electronic circuits I can't say for sure I'm right, but it seems like they don't carry even one single component that matches the 3.3 crossover spec sheet. I must be missing something here, but I have no idea. I might have to settle for an active XO approach in the end.
You should use non-polar electrolytics or back to back polarized types of twice the value.

XO inductors from these sources:
Inductors for Speakers from Madisound

Crossover Inductors in the Speaker Components Department at Parts Express | 296

DIY Speaker Components | Replacement Speakers | and Speaker kits from Meniscus Audio Group

Those look like steel laminate from the inductors that I can see in your picture, try to use same type of same gauge.
These are probably heavier gauge than you need:
http://www.madisound.com/manufacture...edgehammer.php

Meniscus will custom wind and I don't think they charge much more than stock values.

Any updates, you were doing a nice job and I'd disagree that the baffle width is so critical.
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Last edited by PB2; 31st May 2013 at 03:19 PM.
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Old 22nd August 2013, 03:25 AM   #39
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Default NHT 3.3

i've got a pair of 3.3's that i'm looking to sell. there is cosmetic damage to the box, but they still sound great. I also have an extra adcom monoblock. anyone interested?
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Old 22nd August 2013, 04:44 AM   #40
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Quote:
Originally Posted by Hibernator View Post
Has anybody else made a 3.3 or 2.9 mid/high sat and have any advice to offer?

If I build the sat/sub config, is the 21 degree angle on the front no longer relevant as long as I simply point the sats at the listening position using the correct angle?
I got 2 1259 subs during the sale but later got 4 (actually bought 6) DV12 (2 for a friend) from Audio Concepts. This must have been around 1993-94-95.

I found the DV12s better than the 1259 at least for my room.

if you are not including the 21 deg angle make sure you increase the depth to compensate. I believe Ken Kantor is still around and maybe still lurks on diyaudio maybe you can email him.
Ken Kantor about
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