NHT 3.3 Modifications

SY · 7th June 2008, 01:44 PM

I've written up some (I think) worthwhile modifications to the NHT 3.3. If anyone is thinking about cloning them, there's enough info there for you to do so.

http://syclotron.com/?page_id=9

After I get back from camping this weekend, I'll see how many mistakes people found.

I'm pretty happy with this setup.

nickmckinney · 7th June 2008, 04:14 PM

Those were good speakers. I remember repairing a set from a recording studio that had the crossovers fried.

SY · 8th June 2008, 11:47 PM

Apparently, it's almost impossible to kill the drivers. The ones I got had some crossover capacitors spectacularly exploded. It took about 15 minutes to get them singing.

PB2 · 9th June 2008, 01:01 AM

Did you consider an LT to improve the bass extension? The peaked filter provides some subsonic filtering of course.

Oh, I'd say that you can kill them if you try hard enough.
I don't think that tweeter has tinsel lead in wires. At least higher order crossover networks are used.

Which caps exploded, just curious?

Pete B.

SY · 9th June 2008, 01:26 AM

An LT is a good alternative. But it won't be very different- flat is flat. At an f3 of 18Hz, the extension is pretty good.

To show how truly sick I am, I'm currently running the 1259s to 32Hz, 4th order Linkwitz-Riley high pass, then crossing over to a pair of eq'd JBL 2245H in 10 cu ft cabinets. A pair of 500W Sunfire mono amps run the JBLs, with the 1259s powered by a stereo 250Wpc Sunfire.

Dynamic range is not a problem.

edit: The blown cap in all four speakers was C2, but one speaker had a bad C3.

PB2 · 9th June 2008, 01:59 AM

Do you have those JBLs in vented cabinets? Where are they tuned if so?

These are 1259s, 2 on each side, and they are vented:
http://members.aol.com/basconsultants/spkrs.jpg

Pete B.

SY · 9th June 2008, 02:02 AM

Sealed and equalized flat to about 14-15 Hz. Without eq, it's close to a Bessel at an fc of about 55 Hz.

PB2 · 9th June 2008, 03:58 AM

Impressive!

Did NHT have anymore blown 3.3s?

SY · 9th June 2008, 04:22 AM

They had four, now I have four.

They still do have the upper bass and midrange drivers at ACS, I think Madisound has the 1259,and I have the drawings for the cabinets. Just in case you're a good woodworker and are ambitious.

PB2 · 9th June 2008, 12:11 PM

Do you happen to know if the tweeters have rear chambers or not? I have the chambered version of that tweeter and the 1259s. I would like to see the plans for the cabinet, what's the best way, email or download?

Pete B.

7th June 2008, 01:44 PM	#1
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	NHT 3.3 Modifications I've written up some (I think) worthwhile modifications to the NHT 3.3. If anyone is thinking about cloning them, there's enough info there for you to do so. http://syclotron.com/?page_id=9 After I get back from camping this weekend, I'll see how many mistakes people found. I'm pretty happy with this setup. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

8th June 2008, 11:47 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Apparently, it's almost impossible to kill the drivers. The ones I got had some crossover capacitors spectacularly exploded. It took about 15 minutes to get them singing. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

9th June 2008, 01:26 AM	#5
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	An LT is a good alternative. But it won't be very different- flat is flat. At an f3 of 18Hz, the extension is pretty good. To show how truly sick I am, I'm currently running the 1259s to 32Hz, 4th order Linkwitz-Riley high pass, then crossing over to a pair of eq'd JBL 2245H in 10 cu ft cabinets. A pair of 500W Sunfire mono amps run the JBLs, with the 1259s powered by a stereo 250Wpc Sunfire. Dynamic range is not a problem. edit: The blown cap in all four speakers was C2, but one speaker had a bad C3. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

9th June 2008, 02:02 AM	#7
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Sealed and equalized flat to about 14-15 Hz. Without eq, it's close to a Bessel at an fc of about 55 Hz. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

9th June 2008, 04:22 AM	#9
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	They had four, now I have four. They still do have the upper bass and midrange drivers at ACS, I think Madisound has the 1259,and I have the drawings for the cabinets. Just in case you're a good woodworker and are ambitious. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache


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7th June 2008, 04:14 PM	#2
nickmckinney diyAudio Member Join Date: May 2008	Those were good speakers. I remember repairing a set from a recording studio that had the crossovers fried.

9th June 2008, 01:01 AM	#4
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	Did you consider an LT to improve the bass extension? The peaked filter provides some subsonic filtering of course. Oh, I'd say that you can kill them if you try hard enough. I don't think that tweeter has tinsel lead in wires. At least higher order crossover networks are used. Which caps exploded, just curious? Pete B.

9th June 2008, 01:59 AM	#6
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	Do you have those JBLs in vented cabinets? Where are they tuned if so? These are 1259s, 2 on each side, and they are vented: http://members.aol.com/basconsultants/spkrs.jpg Pete B.

9th June 2008, 03:58 AM	#8
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	Impressive! Did NHT have anymore blown 3.3s?

9th June 2008, 12:11 PM	#10
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	Do you happen to know if the tweeters have rear chambers or not? I have the chambered version of that tweeter and the 1259s. I would like to see the plans for the cabinet, what's the best way, email or download? Pete B.

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