I had a later Mission X space, sub + 2 small satellites,
as a portable system whilst I was working abroad.
(With a portable CD player)
Not bad for music, vocal intelligibility was good and
imaging not too bad, but weak in the treble and
overall weight and solidity.
But absolutely excellent for watching DVD's from
my laptop with a LCD projector borrowed from work.
The 6" x 4" NXT drivers appears to be formed from corrugated
plastic sheet (exactly like cardboard sheet), the stuff they make
lightweight plastic file holders from with two magnetic exciters
and what can only be described as cheap stick on rubber feet
strategically placed on the sheet, (10mm, 3 of them I think)
attached by double sided sticky foam around the edge.
IMO for HiFi, close but no cigar. The little system impressed
those that heard it, its best trait was a seamless unfatiguing
vocal range, but excepting this not great in any other area.
As an active system I'm sure some EQ was used on the satellites.
If I was going to get interested in NXT it would be for AV use.
sreten.
as a portable system whilst I was working abroad.
(With a portable CD player)
Not bad for music, vocal intelligibility was good and
imaging not too bad, but weak in the treble and
overall weight and solidity.
But absolutely excellent for watching DVD's from
my laptop with a LCD projector borrowed from work.
The 6" x 4" NXT drivers appears to be formed from corrugated
plastic sheet (exactly like cardboard sheet), the stuff they make
lightweight plastic file holders from with two magnetic exciters
and what can only be described as cheap stick on rubber feet
strategically placed on the sheet, (10mm, 3 of them I think)
attached by double sided sticky foam around the edge.
IMO for HiFi, close but no cigar. The little system impressed
those that heard it, its best trait was a seamless unfatiguing
vocal range, but excepting this not great in any other area.
As an active system I'm sure some EQ was used on the satellites.
If I was going to get interested in NXT it would be for AV use.
sreten.I'd concur with Sreten on his verdict. I bought an end-of-line X-Space after HiFi World raved about it, but found problems with transients eg. from piano music distorting. Later products are supposedly improved, but the one high-end product that has tried it (Cyrus) seems to have disappeared...
Ian
Ian
I've heard some NXT panels too and concur with your findings.
My intended application is non conventional but, unfortunately, I can't give any details yet (but I will later).
I understand that you can buy the exciters and then use them on whatever panels you like. The panels I've seen so far have been variations on the corrugated plastic sheet described by Sretin. You can actually use cardboard and, I'm sure, plenty of other materials. You can make them any size you want, which will affect the bass extension, SPL and efficiency (I think). If you use one exciter it should be placed non-centrally (on a rectangular panel) - presumably for the usual reasons. You can use more than one exciter per sheet.
I thought that, as this is a very cheap and easy system for DIYers to experiment with, folks here might have made their own panels and could report back with their findings. I'd expect that diyAudio members, with their creativity and knowledge, could take this further than the commercial manufacturers have managed so far.
My intended application is non conventional but, unfortunately, I can't give any details yet (but I will later).
I understand that you can buy the exciters and then use them on whatever panels you like. The panels I've seen so far have been variations on the corrugated plastic sheet described by Sretin. You can actually use cardboard and, I'm sure, plenty of other materials. You can make them any size you want, which will affect the bass extension, SPL and efficiency (I think). If you use one exciter it should be placed non-centrally (on a rectangular panel) - presumably for the usual reasons. You can use more than one exciter per sheet.
I thought that, as this is a very cheap and easy system for DIYers to experiment with, folks here might have made their own panels and could report back with their findings. I'd expect that diyAudio members, with their creativity and knowledge, could take this further than the commercial manufacturers have managed so far.
One things for sure, all the debates on coatings for speakers
could easily be applied to corrugated cardboard NXT speakers.
However AFAIK finite element analysis is used to determine
acoustic output, element placement and damping / mass
loading placement, and the edge termination characteristics.
None of these to me are designable by the usual methods.
I'd also say most of us are deeply suspicious of a technology
depending on approximately controlling the chaotic break up
modes of a flat diaphragm, however well you can get it to
work it will still be rubbish, its surprising they are half decent.
I'd like to see a waterfall plot of an NXT diaphragm.
sreten.
could easily be applied to corrugated cardboard NXT speakers.
However AFAIK finite element analysis is used to determine
acoustic output, element placement and damping / mass
loading placement, and the edge termination characteristics.
None of these to me are designable by the usual methods.
I'd also say most of us are deeply suspicious of a technology
depending on approximately controlling the chaotic break up
modes of a flat diaphragm, however well you can get it to
work it will still be rubbish, its surprising they are half decent.
I'd like to see a waterfall plot of an NXT diaphragm.
sreten.
Its a licensing company, which means selling "expertise" and
the right to use whatever "buzzword" they have coined for
the technology, in the same way NXT don't sell NXT panels.
However having no product as such to sell, the need to "big
up" the technology they license I'd of thought was obvious.
For an excellent example of licensing guff over substance visit here :
http://diaural.com
sreten.
the right to use whatever "buzzword" they have coined for
the technology, in the same way NXT don't sell NXT panels.
However having no product as such to sell, the need to "big
up" the technology they license I'd of thought was obvious.
For an excellent example of licensing guff over substance visit here :
http://diaural.com
sreten.
I'm not quite sure of the relevance. Are you saying that no licensed technology can be worthwhile?sreten said:
As far as I can tell, Diaural are selling some sort of crossover technology. I've never heard it and I don't use the things anyway so it's not of much interest to me. There doesn't seem to be much information on their web site so I can't even offer an intellectual critique.
However, you've obviously listened to speakers designed using this technology. What are their main failings in your view?
That's quite clever.Nisbeth said:
Sound reproduction using both conventional loudspeakers and bending-wave loudspeakers
Patent number: GB2387500
Publication date: 2003-10-15
Inventor: KATZ SHELLEY (GB)
Abstract of GB2387500
The sound reproduction method and apparatus utilises both distributed mode and pistonic loudspeakers which are simultaneously driven over frequency ranges which at least partially overlap, for enhancing the spaciousness of the sound produced. The disclosure includes monophonic, stereophonic and multi channel sound reproduction systems and electronic musical instruments such as digital pianos.
The patent is available Here
hope this helps
James
Patent number: GB2387500
Publication date: 2003-10-15
Inventor: KATZ SHELLEY (GB)
Abstract of GB2387500
The sound reproduction method and apparatus utilises both distributed mode and pistonic loudspeakers which are simultaneously driven over frequency ranges which at least partially overlap, for enhancing the spaciousness of the sound produced. The disclosure includes monophonic, stereophonic and multi channel sound reproduction systems and electronic musical instruments such as digital pianos.
The patent is available Here
hope this helps
James
I find the NXT speaker quite interresting. I belive that German Intertechnik ( hope i spelled it right ) sells exciters for diy purpouse ( seen it in their catalog ). Could be fun to play with.
Im going to get a test of this tecnique myself when my "cardboard speakers" arrive in the mail. Bought them dirt cheap and i guess their main purpouse is for computer/advertisment or something like that.
http://www.nxtsound.com/soundpax/release.php
Regards // Mattias S
Im going to get a test of this tecnique myself when my "cardboard speakers" arrive in the mail. Bought them dirt cheap and i guess their main purpouse is for computer/advertisment or something like that.
http://www.nxtsound.com/soundpax/release.php
Regards // Mattias S
I read that if you buy a license from NXT, you get CAD software with it so that you can design speakers. It's probably difficult to design a flat(ish) response speaker without it, finite element maths & other such stuff. Theile & Small won't help you. 
I have some TDK NXT computer speakers, and they sound good for the price and compared to other computer speakers. They aren't as good as conventional ones though, which becomes apparent when you change from one to the other.
One thing that I find troublesome is the dipole nature of the device, position is very important, so they can sound very good in one place, but confused in another.
I have some TDK NXT computer speakers, and they sound good for the price and compared to other computer speakers. They aren't as good as conventional ones though, which becomes apparent when you change from one to the other.
One thing that I find troublesome is the dipole nature of the device, position is very important, so they can sound very good in one place, but confused in another.
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