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We are very pleased to announce that PR Audio has acquired a small quantity of the very well respected Vifa D26NC-55-06 1″ soft dome tweeter.  This is an excellent performing tweeter, and has gained an exceptional reputation on various audio DIY websites, etc.  It combines a very good response curve with low distortion and a very clean waterfall plot (lack of energy storage / resonances) in it’s operating range.  The small form factor allows close placement to the driver(s) it is crossed over to, which reduces lobing effects in the system dispersion pattern.  This tweeter (and it’s predecessor, the D26NC-15-06) have been used by many manufacturers, including Meadowlark Audio (Vireo model) and M & K.  In short, if you like a tweeter that simply reproduces what is in the signal fed to it, this tweeter is hard to beat, in this price range.

The Tymphany specification sheet on the D26NC-55-06 is here:

Features:

Compact size.
Neodymium magnet.
Smooth response to over 30 kHz.
Low distortion.
Ferrofluid cooled.
Double rear chamber.
Low distortion.
Ferrofluid cooled.
Heat sink for increased power handling and lower thermal compression.
Truncated face plate.
Flange 70mm (54Trun.)

Cut-out 49.2mm
Depth 23mm

D26NC55-06 Specifications (per Vifa):

Znom = 6 ohm
Re = 4.6 ohm
fs = 1390 Hz
Qms = 2.09
Qes = 3.67
Qts = 1.33
Mms = 0.31 g
Cms = NA
Sd = 7.1 cm2
BL = 1.85 Tm
Vas – NA
Le @ 1kHz  = 0.05 mH
VC ht. = 1.5mm
Gap Ht. = 2.0mm
Xmax = 0.25 mm peak
VC diameter = Ø 25 mm
Sensitivity @ 2.83V / 1m = 91 dB (very conservative – see curve)
Frequency Range = 3 kHz – 30 Khz (but see note 1).
Nom. Power DIN = 50 W
Long term max. power handling (IEC 18.3) = 100w (See note 1)
Short term max. power handling (IEC 18.3) = 400w (See note 1)
Magnet weight =  0.011 kg, Neodymium.

Price:

$43.00 ea. 
Matched pairs, +/- 1 dB, 2500 Hz – 20,000 Hz, $100/pair.
Matched pairs, +/- 1/2 dB, 2500 Hz – 20,000 Hz, $115/pair.
Matched pairs, +/- 1/4 dB, 2500 Hz – 20,000 Hz, $130/pair. (Very limited supply.)
Order # D26NC-55-06.

Additional Info. – we have several pieces that are slight blems.  These are $5 less, each.  Due to the small qty. on hand, closely matched pairs may not be available.  (We have a few more to test, but at the moment (4/6/10), in the blems the best we have is a +/- 1 dB matched pair.)

  All units are tested for proper operation before shipment.

For additional Ordering Information please click here.

Notes:

1)  Lowest recommended crossover for full power handling = 4.5 kHz, 18 dB / octave min. slope.  This unit has std. single strand lead out wires, ie., NOT tinsel leads, and is therefor not a good choice for lower frequency or slower slope crossovers.  (This is true for the D26NC55-06, D26NC15-06, D26NC67-06, and all similar Vifa models that we know of.)
   

Drawing (From Tymphany Spec Sheet on D25NC55):

More Pics (Click to enlarge):