www.viawave.ru
It has closed rear chamber which correts the problems with distortion and ragged response. Sensitivity is a bit on the high side because of the waveguide, but is that a problem really?
Troels Gravesen has some units and has already tested them and made some speaker plans for it
"Overall frequency response is flat, for my measurements a bit flatter than suggested by Viawave. Measurements suggest 95-97 dB sensitivity in the 1-3 kHz range rising some 100-102 dB sensitivity from 4 kHz to 18 kHz. Quite impressive although I would prefer a higher impedance and lower sensitivity as most speaker constructions rarely require more than 88-92 dB sensitivity. This would also save quite some money in good capacitors for the crossover.
Distortion is very low, even down to 1 kHz @ 2.8V (100 dB) and suggest even an LR2 filter at 2 kHz may be possible, not a common feature of most smaller ribbons.
Impedance is fairly flat and makes crossover work easy. I have simulated the ribbon with four of my constructions and this suggests easy implementation. Due to depth of the ribbon, only modest stepped baffle may be necessary."
It has closed rear chamber which correts the problems with distortion and ragged response. Sensitivity is a bit on the high side because of the waveguide, but is that a problem really?
Troels Gravesen has some units and has already tested them and made some speaker plans for it
"Overall frequency response is flat, for my measurements a bit flatter than suggested by Viawave. Measurements suggest 95-97 dB sensitivity in the 1-3 kHz range rising some 100-102 dB sensitivity from 4 kHz to 18 kHz. Quite impressive although I would prefer a higher impedance and lower sensitivity as most speaker constructions rarely require more than 88-92 dB sensitivity. This would also save quite some money in good capacitors for the crossover.
Distortion is very low, even down to 1 kHz @ 2.8V (100 dB) and suggest even an LR2 filter at 2 kHz may be possible, not a common feature of most smaller ribbons.
Impedance is fairly flat and makes crossover work easy. I have simulated the ribbon with four of my constructions and this suggests easy implementation. Due to depth of the ribbon, only modest stepped baffle may be necessary."
I attached wrong picture, that is GR850 and it has just felt in rear chamber. The GRT145 is claimed to have mylar strips that are U-shape. Perhaps the service pdf just lacks them, patent pending?
This is GRT145 with flat front plate.
The earlier model GR850 has waveguide and the response is perhaps easier to implement in passive systems
This is GRT145 with flat front plate.
An externally hosted image should be here but it was not working when we last tested it.
The earlier model GR850 has waveguide and the response is perhaps easier to implement in passive systems
Hope this helps
In "VK" "FB" and the site itself, the only mentioning of the seal per say is:
"the gap between the magnets' poles and a ribbon is sealed by U-shape suspension made of PET film ..."
Claims are lower distortions higher efficacy and no acoustical "short circuit".
No insurance. Shipping from US to Canada is pricey. They are heavy tho. Like 3lb each or 1.3kilo.
Ok I wasnt sure if it was because of insurance or weight. They came pretty quick though.
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