NXT.......rubbish??....THINK AGAIN!

FullRangeMan · « **Reply #40 on:** 24 Aug 2009, 03:22 pm »

Quote from: Russell Dawkins on 24 Aug 2009, 06:11 am

Quote from: zygadr on 23 Aug 2009, 11:40 am
This is the link I got from NXT :http://en.billionsound.com.
Look under'' PRODUCTS'' and you will see a picture of a yellow exciter on the right. Click on that to see the range.
This link doesn't work for me.

Try the regular Site URL here http://www.billionsound.com

FullRangeMan · « **Reply #41 on:** 25 Aug 2009, 07:33 am »

I was think the panel could have a better performance without a frame, just suspended by two thin nylon lines blew up in the ceiling of the room?? It is very simple and inexpensive.
Just a idea

P.S.: A interesting feature of the Podium is the very rounded corners of the panel, Huuumm

FullRangeMan · « **Reply #42 on:** 25 Aug 2009, 09:49 am »

Quote from: zygadr on 25 Aug 2009, 07:21 am

This is all theory at the moment, but I can't see that 4 small areas of adhesion will alter the sound enough to be noticeable......I hope

Try to position the 4 supporters by the Golden rule! Should be less spurious vibrations.

Angaria · « **Reply #43 on:** 25 Aug 2009, 04:23 pm »

Based on reading through several patents, you'll have better performance via reducing edge reflections when mounted to a frame with an absorbent material.

Russell Dawkins · « **Reply #44 on:** 26 Aug 2009, 08:08 am »

Quote from: FULLRANGEMAN on 24 Aug 2009, 03:22 pm

Quote from: Russell Dawkins on 24 Aug 2009, 06:11 am

Quote from: zygadr on 23 Aug 2009, 11:40 am
This is the link I got from NXT :http://en.billionsound.com.
Look under'' PRODUCTS'' and you will see a picture of a yellow exciter on the right. Click on that to see the range.
This link doesn't work for me.
Try the regular Site URL here http://www.billionsound.com

I still get:
HTTP 404 - File not found

gilbodavid · « **Reply #45 on:** 26 Aug 2009, 09:37 am »

I'm interested. i presume these panels are dipole and so have to be away from rear wall? Also has anyone tried say 10-12 exciters per panel arranged non linierly, on a panel the size of a quad esl57? What sort of base response can one expect in this kind of instance? thanks

FullRangeMan · « **Reply #46 on:** 26 Aug 2009, 12:31 pm »

Try the regular Site URL here http://www.billionsound.com
I still get:
HTTP 404 - File not found

Better made a search in the Google!!

FullRangeMan · « **Reply #47 on:** 26 Aug 2009, 12:41 pm »

Quote from: gilbodavid on 26 Aug 2009, 09:37 am

I'm interested. i presume these panels are dipole and so have to be away from rear wall? Also has anyone tried say 10-12 exciters per panel arranged non linierly, on a panel the size of a quad esl57? What sort of base response can one expect in this kind of instance? thanks

NXT Panels are bipolar panels!! For this reason I have great interest in this project!! It do not have the usual 5dB of attenuation of the DIPOLES panels, nor need full space around. As I never listen a NXP panel, I will let this detail to ZYGADR inform you.
Also has anyone tried say 10-12 exciters per panel >> Interesting, I would like to know this too!!

Angaria · « **Reply #48 on:** 26 Aug 2009, 10:50 pm »

If someone could get ahold of this, or much better, their code, that would be helpful with the multiple exciter case. http://www.aes.org/e-lib/browse.cfm?elib=13645

Russell Dawkins · « **Reply #49 on:** 26 Aug 2009, 11:15 pm »

Quote from: FULLRANGEMAN on 26 Aug 2009, 12:41 pm

NXT Panels are bipolar panels!! For this reason I have great interest in this project!! It do not have the usual 5dB of attenuation of the DIPOLES panels, nor need full space around.

I can't get my head around the notion of a panel being bipolar and not dipolar, especially in the "lower" frequencies (below about 300 Hz). Can you supply a reference, Fullrangeman?
Link still doesn't work, by the way - does it for you?

optic · « **Reply #50 on:** 26 Aug 2009, 11:23 pm »

This Patent describes some information on size ratios of panels sizes and location of the exciter. http://www.google.com/patents/about?id=jaYIAAAAEBAJ&dq=dml+speaker

From my very quick reading. It looks like there are some ratios for the height / width for the panel. Looks like a ratio of 3/7, 4/9, 5/13 are good and similar for the position of the exciter.

If someone with more experience at reading patents could confirm?

Cheers

O

FullRangeMan · « **Reply #51 on:** 27 Aug 2009, 03:58 am »

Quote from: Russell Dawkins on 26 Aug 2009, 11:15 pm

Quote from: FULLRANGEMAN on 26 Aug 2009, 12:41 pm
NXT Panels are bipolar panels!! For this reason I have great interest in this project!! It do not have the usual 5dB of attenuation of the DIPOLES panels, nor need full space around.
I can't get my head around the notion of a panel being bipolar and not dipolar, especially in the "lower" frequencies (below about 300 Hz). Can you supply a reference, Fullrangeman?
Link still doesn't work, by the way - does it for you?

For me works fine in both address names, I use Explorer 7 and MozilaFireFox 3.2.1
In a old NXT Company doc(mayne in paper, I dont remember) I read they said it is Bipolar, but in this WIKI Link http://en.wikipedia.org/wiki/Distributed_mode_loudspeaker they report it is bipolar too, in the paragraph ADVANTAGES.
This other Link http://www.vxm.com/NXT.html supplied by ZYGADR show a nice 3D figure (figure 3) showing Polar Response.
NXT Company should boast Presses that his panels are Bipolar, the today NXT Site do not say a word about it.
Sincerely
P.S.: In this VMX Link above they say it is Bipolar in the topic The Benefits I would love to read this AES doc
P.P.S.: This 5/13 panel size informed by Optic is Golden Ratio 2.6, for our Hi-End use here it is the best(larger),
the others sizes are too small, unless you prefer few exciters.

Russell Dawkins · « **Reply #52 on:** 27 Aug 2009, 04:22 am »

thanks, fullrangeman for the link.
I am using Firefox 3.5.2 and Safari and get the HTTP 404 - File not found on either, but it's OK, you have gone out of your way enough on this trivial matter.
Russell

FullRangeMan · « **Reply #53 on:** 27 Aug 2009, 04:46 am »

Thankyou ZYGADR I will no need the AES doc anymore!! I choose NYLON/FISHING line for it is invisible, real cheap, and have almost zero mass, so it do not have resonances. Iam just afraid if they will moving front to back when panel in use???
Iam planing a panel 72cm x 188cm or 77cm x 201cm with 8 or 10 exciters in serie-parallel.
How could I to calculate the SPL with the DAYTON exciters??
Thanks
P.S.: If you could inform us about the FISHING line results in the future could be great!!
P.P.S.: I do not know if a panel fixed in a frame could make a better sound!! than the nylon line. Surely should be a difference!!
That I loved to know right now... My choice is the one made better sound!!

FullRangeMan · « **Reply #54 on:** 27 Aug 2009, 06:35 am »

THANKYOU for this Link ZYGADR.

FullRangeMan · « **Reply #55 on:** 27 Aug 2009, 05:38 pm »

The Dayton DAEX25 Sound Exciter is in stock again at PartsExpress, same price $16,90/16,00 earch
http://www.parts-express.com/pe/pshowdetl.cfm?Partnumber=300-375

gilbodavid · « **Reply #56 on:** 28 Aug 2009, 01:25 pm »

Zygy, what are the panels like leaning quite vertically against the wall? in my listenin room they'd have to be as close to the wall as possible. what distance from the wall can you get away with. i've owned 4 pairs of quad esl's and i'm wondering if these are as fussy. also, i've only just realised that the exiters are on the back and the whole gatorfoam panel is the membrane at the front that produces the sound. Amazing! no wonder the panel material is vital. I read the other thread, u've put immense amounts of work into this, thank you for sharing. Lastly do you think the $5 exciters will be as high quality as the Daytons? if not, how different (its a big jump in expenditure for me.) I've read the Podium review, and have realised that the designer put huge amounts of time in getting his design rights so copying it's a no-brainer. smart work, thanks again,

David

doug s. · « **Reply #57 on:** 28 Aug 2009, 06:18 pm »

Quote from: FULLRANGEMAN on 27 Aug 2009, 05:38 pm

The Dayton DAEX25 Sound Exciter is in stock again at PartsExpress, same price $16,90/16,00 earch
http://www.parts-express.com/pe/pshowdetl.cfm?Partnumber=300-375

why not get the cheaper ones?

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=309-148

doug s.

FullRangeMan · « **Reply #58 on:** 28 Aug 2009, 06:35 pm »

Quote from: doug s. on 28 Aug 2009, 06:18 pm

Quote from: FULLRANGEMAN on 27 Aug 2009, 05:38 pm
The Dayton DAEX25 Sound Exciter is in stock again at PartsExpress, same price $16,90/16,00 earch
http://www.parts-express.com/pe/pshowdetl.cfm?Partnumber=300-375
why not get the cheaper ones?
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=309-148
doug s.

I afraid of cheap products, maybe he feels so. I would like to know what is the best? The dayton or the other white cap exciter? Before buy anything.
Regards

longdrive55 · « **Reply #59 on:** 28 Aug 2009, 07:07 pm »

Quote from: FULLRANGEMAN on 28 Aug 2009, 06:35 pm

Quote from: doug s. on 28 Aug 2009, 06:18 pm
Quote from: FULLRANGEMAN on 27 Aug 2009, 05:38 pm
The Dayton DAEX25 Sound Exciter is in stock again at PartsExpress, same price $16,90/16,00 earch
http://www.parts-express.com/pe/pshowdetl.cfm?Partnumber=300-375
why not get the cheaper ones?
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=309-148
doug s.
I afraid of cheap products, maybe he feels so. I would like to know whait is the best? The dayton or the other white cap exciter? Before buy anything.
Regards

In my opinion the cheap ones look just like the ones that Zygadr used. The numbers by the voice coils are similar, but not exact too. The only concern I have about the cheaper ones is that they are 4 ohm, which means a lower amp load if you try to parallel multiples of them together.

Of course I really don't know how much parallel vs. series connections affect sensitivity with this kind of panel driver. Does anyone know if parallel connections increase sensitivity as they do with pistonic drivers sharing a baffle? Also, if you parallel some together, but then have to series connect a couple of paralleled groups together, does that diminish any sensitivity gains you might have gotten from the paralleled exciters?