TR-1 Constant directivity horn and 1” compression driver set

Description
The D.A.S. TR-1 is a compact sized
mid-high frequency unit consisting of
the D/TR-1 horn coupled to an M-3
compression driver.

The D.A.S. M-3 is a 1" throat

compression driver featuring a 1.75"
titanium diaphragm. The copper-clad
aluminium voice coil is edge-wound
and thermal bonded to a Kapton
former, which ensures resistance to
high temperatures.

The D/TR-1 is small format CD horn,

delivering a 80° constant horizontal
and vertical coverage.

The high frequency rolloff shown in the

frequency response overleaf is a
caracteristic of constant directivity
horns that arises from the transducer's
FEATURES falling power response. When used as
part of a passive system, it may be
» 1" compression driver with 1.75” titanium diaphragm compensated at the input filter stage.
» 80° x 80° nominal dispersion When used fully active, generic
processors will normally feature CD
» 70W program power handling horn equalization.
» Compact size
Mounting
SPECIFICATIONS The unit can be mounted to enclosures
AES RMS (Average) Power HandlingR: 35 W by four 5 mm diameter screws.
Programme Power HandlingP: 70 W
Peak Power HandlingK: 140 W
Nominal ImpedanceNI, Minimum Impedance: 8 Ω, 8.6 Ω (at 3.3 kHz) The horn’s sturdy polypropylene
Nominal voice coil resistance: 7Ω
On-aaxis Nominal SPL 2.83V / 1mS: 103 dB SPL construction allows for mounting
Nominal Frequency Range: 2k Hz - 20 kHz
Minimum Recommended Xover Frequency: 1.5 kHz directly to an enclosure’s front, with no
-66 dB BeamwidthsB: 81° (+30,-24) Horizontal need for an additional support panel.
(average, 2 to 12.5 kHz) 78° (+35,-21) Vertical
Directivity: Q (Rθ)Q: 11.6 (+4.5,-5.7)
(average, 2 to 12.5 kHz) DiD: 10.7 dB (+1.4,-3.0)
Diaphragm Material and Thickness: Pure titanium / 0.03 mm (0.0012 in)
Voice Coil Material: Edge-wound, aluminium, copper-clad
Voice Coil Diameter: 44 mm (1.73 in)
Voice Coil Former Material: Kapton®
Phase Plug: Multi-radial slit
Magnetics: Anisotropic Barium Ferrite
Flux Density: 1.2 T
Input Connection: Push terminals, 4 mm diameter
Polarity: Positive voltage to red terminal moves diaphragm
away from phase plug
Horn material and colour: Pressure molded polypropylene, black
Dimensions (H x W x D): 130 x 160 x 145 mm (5.2 x 6.3 x 5.7 in)
Minimum Baffle Cutout: 105 x 105 mm (4.1 x 4.1 in)
Weight: 1.8 kg (4.0 lbs)
Shipping Weight: 2.0 kg (4.4 lbs)
R As per AES2-1984 (ANSI S4.26-1984), re. the minimum impedance, based on a 2 hour test using a 6 dB crest factor pink noise signal band-
limited to 2-20 kHz. Temperature rise 49°C, infra-red probe.
P Conventionally 3 dB higher than the RMS measure, although this already utilizes a programme signal. K Corresponds to the signal crests for
the test described inR.
NI Conventionally a 16 ohm transducer. However, a rating that complied with IEC 268-5 would be 10 ohms.
S IEC average 1.25 kHz to 8 kHz.
B Average of one-third octave band measures. One and one-third octave bands comply to ANSI S1.11-1986
Q Computed from two degree resolution vertical and horizontal one-third octave polars using sinusoidal weighting. D 10 log(Q).
Polars were measured at two degree angular and 1/24th octave frequency resolution.
AUTOPOL, a platform consisting of custom and customized hardware and software, was used for the automated high-resolution acquisition
and post-processing of directivity data. The digital storage of the data allows further processing and conversion to other software formats.
Modelling data can be found at http://www.dasaudio.com/.
Frequency Response
Figure 1 shows the frequency response at 1 m
of a unit radiating to an anechoic environment
and driven by a 2.83 V swept sine signal. Grey
curve shows response with filter network shown
below.

Impedance
Figure 2 shows impedance with frequency.

Distortion
Figure 3 shows the Second Harmonic Distortion
(grey) and Third Harmonic Distortion (dotted)
curves for a unit at 5.5 V.

Beamwidth
Figure 4 shows the -3, -6 and -10 dB horizontal
(solid) and vertical (dashed) beamwidth with
frequency curves. -6 dB ones are shown with
thicker traces for clarity.

Axial Directivity Q(Rθ) and Di

Figure 5 shows the above characteristics with
frequency. Thin continuous and dashed lines
show partial horizontal and vertical
characteristics, respectively.

NOTES. 1.Frequency response: referred to 1 m; low end

obtained through the use of near field techniques; one-third
octave smoothed for correlation with human hearing. 2.In
practice, cable and connector impedance need to be added.
3.Harmonic distortion components are not plotted beyond 20
kHz; near-field techniques used. 4.Directivity characteristics
plotted with respect to frequency are the average within the
one-third octave bands of center frequencies noted by the
marks at the bottom of the graphs, but are joined up for display
purposes. All other characteristics plotted vs. frequency use
1/24th octave resolution. Regions of less than 1 dB below goal
level and sharp notches may be ignored when calculating
beamwidths. 5.Directivity factor and index were computed from
two degree resolution vertical and horizontal polars using
sinusoidal weighting. 6.Polars were acquired by placing the unit
on a computer controlled turntable inside our anechoic
chamber. Measurement distance was 4 m.

Product improvement through research and development is a

continuous process at D.A.S. Audio. All specifications subject
to change without notice.

D.A.S. Audio, S.A.

TE/tr1-01
05/02

C/. Islas Baleares, 24 - 46988 Fuente del Jarro - Valencia, SPAIN

Tel. 96 134 0525 - Tel. Intl. +34 96 134 0860 - Fax. 96 134 0607 - Fax. Intl. +34 96 134 06 07
D.A.S. Audio of
America, Inc. Sunset Palmetto Park 6816 NW 77th Court, Miami, FL
33166, U.S.A. Tel. 305 436 0521 - Fax. 305 436 0528
http://www.dasaudio.com