Negatron ii HT

[NBPK402]

I am assuming the screw terminals are for the speakers and for power (for the VU Meter)... the there is a single cable that plugs into one of the white terminals in the 3rd picture, no idea where the other end goes

 

[NBPK402]

New horn stands...right channel in place, just needs to be wired up tomorrow we will do the left channel. Sometime in the near future the rears will be completed, center made, and to finish off the setup...horns will either be wrapped with carbon fiber or painted. This fall I will be putting the Denafrips Athena up and the Lujin U1 mini. The Marantz av8805a is doing a pretty good job, and the front channels go through the Pontus and then active crossovers. All lower base channels will be room tuned with Dirac. Sorry for the blurry pictures. I will retake some after we get the left side done in better lighting.

Plate amp is on top of the f20...still need to wire up the VU Meters, and fab a support brace for them.

Below the horn in the amp stand is the temporary amp for the mids and compression driver. A new dual channel amp with meters ids currently being made of Mesquite, and carbon fiber.

 

[NBPK402]

Better pics...

 

[NBPK402]

Question...does it make a difference what color a speaker is behind a acoustically transparent projection screen?
Is it better to paint a speaker with a satin or matt finish or is a gloss finish ok (behind a AT screen)?

I am asking this as I plan to get a projection setup down the road and it is about time to paint the k402 horns.

 

[NBPK402]

I am asking this to find out if the color will affect the image seen on the screen. I know theaters use flat black, and in the past I did the same, but I would like a nice colorful speaker when the screen gets up...without affecting the image on the scrreen.

 

[NBPK402]

Update: I decide to try out the Fosi v3 monoblocks in my setup...what the heck they are so inexpensive and raved about everywhere.

They arrived very well packed and shipped fast from Amazon. I also ordered a 2nd 48v power brick since they are about 10' apart. I hooked them up to my Celestion axi2050s (replaced the Icepower 50asx2BTLs), and gave them a nice listening too. First thing I noticed was there was zero hiss from the compression drivers...even with my ear at the horn mouth! Now this was something I def wanted...as the Icepower does have hiss although you had to put your ear at the horn mouth to even detect it. Next I notice a brighter, clearer mids and HFs. When I purchased these...I figured if they were not good for the horns...they would go to the atmos channels, but it looks like they will stay on the compression drivers.
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Now the only downside to these bad boys is they run hot. I have searched and this is normal, mine are actually cooler than when the posted tests were posted. I still would like these to be cooler and found one guy who added a silicone pad to each amp and then put a large heatsink on each amp. The guy claims luke warm now, so that is my next mod! I have copper heatsinks for the bottom of each amp and a 50mm high fan style aluminum fan for the top of each amp coming.

I also purchased a Teradak Linear Power Supply from Aliexpress for my Roon. I am still burning it in, and it is a little improvement to my ears on my system over the stock brick. So far I am hearing a little bit clearer and tighter sound. I also am hearing low level cymbals and brushes that I have not heard before on certain tracks.

I am waiting on a few new allenhead bolts (the ones I ordered were to short for the wood inserts as the threads are not flush with the top of the inserts), which should be here soon. Then I will be assembling the 2 amps. Each amp will have 2 125asx2btl amps in it connected to its own VU meter. One amp will be for the heights,, and the other for the 15" mids. The cabinets were not made the way I specified, but look good...so I am still going to be using them. Once I get them assembled..I will post some pics and explain what is not as I requested. The cabinets have carbon fiber front and rear panels and a Mesquite cabinet stained to match the subs, rack, and horn stands.

On the MEHs, and my acoustic panels...my wife said the look was to dark, so I ordered some off white speaker grill material (the color I think looks better now as it lightens up the room...my wife was right). I am waiting on some small pieces of aluminum to guide and hold the grills on the top and sides, and the magnets will be used for the bottoms of the grills.


I am using what was left of my off white duck cloth material (acoustic panels), for recovering the acoustic panels and have ordered some more to finish the rest of the panels..

The rack is now fully assembled, and the next item will be making doors with white grills (same as the horns). I hope to have these done sometime soon.

 

[NBPK402]

Today I finished the 2nd acoustic panel stands. I have a bunch of parts arriving this next week, so I should have more pics next weekend. The curtains on the left side will be coming down and one of the upper acoustic panels will be placed there. In addition my height channel speakers will be mounted just below the acoustic panels hanging on the front wall.

 

[Sonnie Parker]

Love the new amp cases... Lol... Your the only guy I know that will have horns for surrounds... That is just so cool... Hey, if Sonnie can have ML ESLs for surrounds you can certainly have horns...

Uh... I have all horns now with my JTR speakers. I'll be posting a new video as soon as I can get our painter over here to repaint our entranceway, where I've patched the walls.

Question...does it make a difference what color a speaker is behind a acoustically transparent projection screen?
Is it better to paint a speaker with a satin or matt finish or is a gloss finish ok (behind a AT screen)?

I am asking this as I plan to get a projection setup down the road and it is about time to paint the k402 horns.

I don't think you can see through the acoustic screens, although I could be wrong.

You know, with horns, being they are more directional, you shouldn't get too many reflections off the side walls. I'd really only be concerned with reflections for two-channel music, as it probably won't make too much difference for movies. Of course, that's just my opinion.

 

[NBPK402]

Uh... I have all horns now with my JTR speakers. I'll be posting a new video as soon as I can get our painter over here to repaint our entranceway, where I've patched the walls.


I don't think you can see through the acoustic screens, although I could be wrong.

You know, with horns, being they are more directional, you shouldn't get too many reflections off the side walls. I'd really only be concerned with reflections for two-channel music, as it probably won't make too much difference for movies. Of course, that's just my opinion.

Congrats on your new horns! I Have had horns several times and MLs once. At tines I wish I had a simpler setup and electrostatic again. There was a magic with my Classe Audio, Mitchell, MLs. So very different from all my previous and current horns.

On being able to see the speakers behind the screen...I have seen others with lighting behind a AT screen, and you could se the speakers (Not like without a screen though). I am really just curious if the speakers were sayna gloss red, yellow or other color that pops...would the projector cause a reflection toward the screen.

 

[NBPK402]

I removed one horn from its cabinet today...it will be going cabinetless to match the fronts. The 2nd cabinet I am going to pay someone to remove the horn...as I have been unable to figure out what is still holding it in the cabinet, besides silicone, and I have been unable to get the silicone removed..

First cabinet took me 4 hours to remove the horn, and this was after the drivers and wiring were already removed! On this horn I used silicone caulk adheasive plus dual layers of a dynamat type substance. This I think is the cabinet that dialed in the easiest and best...I think the dynamat was the reason. Now the pain with dynamat is the removal...way harder than installing...as it really sticks to mdf!

 

[Sonnie Parker]

Four hours... wow... I bet that was tedious, to say the least. I believe I'd hire someone to do it too.

 

[ddude003]

I have found, IMHO, that horns sound best with a tubed preamp and/or tubed amp... And the mids and bass sound best with solid state amps... Which complicates things with bi or tri amping... Where electrostatic usually handle the highs and mids with one panel, tubes sound great here, and then manage the lows with an solid state amp... I guess this may be just my preference... Stats just seem faster to me... Creating great leading edge transitions... Yea, tubes are harmonic generators for more air and sparkle...

 

[JStewart]

On being able to see the speakers behind the screen...I have seen others with lighting behind a AT screen, and you could se the speakers (Not like without a screen though). I am really just curious if the speakers were sayna gloss red, yellow or other color that pops...would the projector cause a reflection toward the screen.

Seymour AV has a black AT backing available for their AT screens. They might be good folks to ask.
Contact info on this page:

Seymour AV | About Seymour AV

Seymour AV is the premier manufacturer of acoustically transparent home theater projection screens in the world, maintaining the highest standards in projection screen innovation, design and craftsmanship

seymourav.com

 

[NBPK402]

Seymour AV has a black AT backing available for their AT screens. They might be good folks to ask.
Contact info on this page:

Seymour AV | About Seymour AV

Seymour AV is the premier manufacturer of acoustically transparent home theater projection screens in the world, maintaining the highest standards in projection screen innovation, design and craftsmanship

seymourav.com

That might be the solution, thanks!

 

[NBPK402]

I have found, IMHO, that horns sound best with a tubed preamp and/or tubed amp... And the mids and bass sound best with solid state amps... Which complicates things with bi or tri amping... Where electrostatic usually handle the highs and mids with one panel, tubes sound great here, and then manage the lows with an solid state amp... I guess this may be just my preference... Stats just seem faster to me... Creating great leading edge transitions... Yea, tubes are harmonic generators for more air and sparkle...

It has crossed my mind to try and find the old Classe dr6 preamp that I used to have...or the Audible Illusions Modulus 6 tube preamp (except the modulus is not balanced)....both were while I had Martin Logans.

Currently I am in awe of the Fosi v3 on the Celestion axi2051s.