C16N001/F E0051
C16N001/F
E0051-04/06
Precision cast, machined and surface treated magnesium cone acts as a piston
through the audible frequency band without any sign of midrange resonances.
A unique radial reinforced rubber surround reduces resonances and prevents surround break up at large excursions.
Heavy copper rings mounted above and below the T-shaped pole piece reduce non
linear and modulation distortion and increase overload margin.
The coaxially arranged precoated fabric dome high frequency unit has a low resonance frequency, and integrates with the cone driver to form a point source.
The extremely stiff and stable injection moulded metal basket keeps the critical components in perfect alignment.
Large windows in the basket both above and below the spider reduce sound reflection, air flow noise and cavity resonances to a minimum.
100
50
95
90
40
85
SPL [dB]
30
75
70
20
65
60
Impedance [ohm]
80
10
55
50
10
100
1 000
10 000
0
Frequency [Hz]
The frequency responses above show measured free field sound pressure in 0, 30, and 60 degrees angle using a 10L closed box. Input
2.83 VRMS, microphone distance 0.5m, normalized to SPL 1m.The dotted line is a calculated response in infinite baffle
based on the parameters given for this specific driver. The impedance is measured in free air without baffle using a 2V
sine signal.
Woofer
Tweeter
Woofer
Tweeter
Nominal Impedance
4 Ohms
6 Ohms
Recommended Frequency Range
30-3000 Hz
2000-25000
Voice Coil Resistance
3.2 Ohms
4.8 Ohms
Voice Coil Inductance
0.27 mH
0.05 mH
Short Term Power Handling *
250 W
220 W
Force Factor
4.4 N/A
2.3 N/A
Long Term Power Handling *
80 W
90 W
Free Air Resonance
37 Hz
1200 Hz
Characteristic Sensitivity (2.83V, 1m) 85 dB
90 dB
Moving Mass
14.6 g
0.3 g
Voice Coil Diameter
39 mm
26 mm
Air Load Mass In IEC Baffle
0.56 g
-
Voice Coil Height
20 mm
1.5 mm
Suspension Compliance
1.3 mm/N
-
Air Gap Height
6 mm
2.0 mm
Suspension Mechanical Resistance 1.09 Ns/m
-
Linear Coil Travel (p-p)
14 mm
Maximum Coil Travel (p-p)
22 mm
Magnetic Gap Flux Density
0.87 T
Magnet Weight
0.42 kg
Total Weight
1.55 kg
Aut 2008-1
RoHS compliant product
0.5 mm
2
7 cm2
Effective Piston Area
94 cm
VAS
15 Litres
-
QMS
3.24
-
-
QES
0.58
-
-
QTS
0.49
-
1.2 T
EC16-001
www.seas.no
Application note for
C16N001/F
This document will present to you a possible way of utilizing the SEAS C16N001/F
coax-unit. The goal of the project was
to make a small as possible loudspeaker
without sacrificing the overall sound quality. For this reason we chose to use a closed
box, as it normally gives a smaller box volume than bass-reflex or transmission line
designs. It also makes it easy to integrate
with a subwoofer.
Box-volume was chosen on the basis
of what sounded best, but still gave a
reasonably small enclosure, without being constrained by the classic theoretical
Thiele/Small-alignments. The chosen box
volume is 5 litre and is loosely filled with Acousto-Q damping material.
The small enclosure gives the bass response a small bump in the low end
that gives a pleasant fullness to the bass. This is desirable because the overall sound pressure capabilities is limited from such a small driver, and thus
keeping you from turning up the volume to try to get some more bass, resulting in higher distortion and an unpleasant listening experience. The
box drawing is attached at the end of this note.
The cross-over for the coax-unit was derived from the goal of getting a
reasonably flat frequency response, a smooth power response and keeping the tweeter and woofer in-phase across the cross-over region. The
schematic for the cross-over and measurements is shown on the next page.
The SPL is measured at 1m 15◦ off-axis to avoid the inevitable coax on-axis
nulls. This measurement also correlates very well to the averaged off-axis
measurements from 0◦ − 45◦ . The coils should be air-cored when possible,
with low internal resistance. The dcr of the L3 coil should be included
when selecting the resistance R3. All caps should be of polypropylene foil,
or better, and the resistors should be metal oxide resistors.
To achieve a deeper bass response and higher maximum SPL capabilities,
the loudspeaker should be teamed up with a high quality subwoofer, like
the SEAS L26ROY. The coax-monitor should then be rolled off around
80Hz with a 24dB/oct high-pass filter. An active filter is highly recommended for this task. The added bonus of using a subwofer is that the
midrange gets even better, because of reduced intermodulation distortion
in the woofer.
SEAS, October 31, 2008
Figure 1: Measurements
Figure 2: Crossover schematics
A
80,0
200,0
5,0
176,0
A-A ( 1 : 4 )
B
100,0
B
,0
n 12
A
7
14
n
bidland
Designed by
7,0
160,0
Checked by
Date
31.10.2007
Date
Edition
Front: 19mm MDF
1/1
Sheet
Topp/Bunn/Sider: 12mm MDF
16cm coax box_5liter
230,0
261,0
B-B ( 1 : 4 )
Approved by
136,0
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