JBL D250 X Rev. 01 07 10 I Spec Sheet

User Manual: JBL JBL - Manuals+

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The D250-X is a cost-effective compression driver
with a light-weight and strong phenolic diaphragm designed
for medium band (voice) reproduction in indoor sound
systems and small PA systems.
The 1" (25 mm) exit fits all Selenium horns with a 25
model number ending (HL14-25, HC23-25, and so on).
Its high density magnetic assembly.
The voice coil is made of high temperature wire
®
wound on Kapton former to withstand high operating
temperatures.
Its precisely engineered diaphragm structure and
alignment mechanism allows for easy, reliable and cost
effective repair in case of diaphragm failure.
SPECIFICATIONS
Nominal impedance..................................8 W
Minimum impedance @ 615 Hz. . . . . . . . . . . . . . . . . . . . . . . 7.2 W
POWER USING CROSSOVER (12dB/oct) ACTIVE PASSIVE
5
AES (HPF 500 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . 40. . . . . . . -- W
5
AES (HPF 1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 . . . . . . .-- W
1
MUSICAL PORGRAM (HPF 500 Hz) . . . . . . . . . . . . . 80 . . . . .150 W
1
MUSICAL PROGRAM (HPF 1kHz) . . . . . . . . . . . . . . 86. . . . . 200 W
Sensitivity
2
On horn, 2.83V@1m, on axis . . . . . . . . . . . . . . . . . . 107 dB SPL
3
On plane-wave tube,0.0894V . . . . . . . . . . . . . . . . . . 116 dB SPL
Frequency response @ -10 dB . . . . . . . . . . . . . . . 400 to 9,000 Hz
Throat diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 (1) mm (in)
Diaphragm material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Phenolic
Voice coil diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 (2) mm (in)
Re..............................................6.0 W
Flux density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.10 T
Minimum recommended crossover (12 dB / oct). . . . . . . . . 500 Hz
1
Musical Program= 2 x W RMS.
2 Measured with HL14-25 horn, 1,000 - 3,500 Hz average.
3 The sensitivity represents the SPL in a 25 mm terminated tube, 600 - 1,500 Hz average.
5
ADDITIONAL INFORMATION
Magnet material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barium ferrite
Magnet weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332 (11.7) g (oz)
Magnet diameter x depth . . . . . . . . . . . . . . 102 x 12 (4.02 x 0.47) mm (in)
Magnetic assembly weight . . . . . . . . . . . . . . . . . . . . . . 978 (2.15) g (lb)
Housing material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum
Housing finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Silver epoxy
Magnetic assembly steel finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Zinc-plated
Voice coil material. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Copper
®
Voice coil former material . . . . . . . . . . . . . . . . . . . . . . . . . Polyimide (Kapton )
Voice coil winding length. . . . . . . . . . . . . . . . . . . . . . 5.7 (18.70) m (ft)
Voice coil winding depth . . . . . . . . . . . . . . . . . . . . . . . 3.0 (0.12) mm (in)
Wire temperature coefficient of resistance (a25). . . . . 0.00404 1/°C
3
Volume displaced by driver. . . . . . . . . . . . . . . . . . . . 0.5 (0.018) l (ft )
Net weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,290 (2.84) g (lb)
Gross weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,360 (2.99) g (lb)
Carton dimensions (W x D x H) . . 41 x 30.5 x 10 (16.1 x12 x 4) cm (in)
MOUNTING INFORMATION
3
Horn connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Screw-on 1 / ” - 18 TPI
8
Connectors.........................................Push terminals
Polarity . . . . . . . . . . . . . . . . . Positive voltage applied to the positive terminal
(red) gives diaphragm motion toward the throat
Power handling specifications refer to normal speech and/or music program material,
reproduced by an amplifier producing no more than 5% distortion. Power is calculated as
true RMS voltage squared divided by the nominal impedance of the loudspeaker. This
voltage is measured at the input of the recommended passive crossover when placed
between the power amplifier and loudspeaker.
Test with duration of 2h with pink noise (from 6dB crest factor) and filtered a decade of
often-cut.
PROFESSIONAL LINE - Compression Driver
D250-X
Dimensions in mm.
DRIVER x HORN CONNECTION
L O U D S P E A K E R S
HC5625-SLF
D250-X HM11-25
HM17-25
HM25-25
HC23-25
HL50-25
HL40-25
HL14-25
W1 3/8" - 18TPI
76
60 16
ø 112
ø 25
HARMONIC DISTORTION CURVES W/ HL14-25 HORN, 5 W / 1 m.
POLAR RESPONSE CURVES
RESPONSE AND IMPEDANCE CURVES W/ HL14-25 HORN INSIDE AN
ANECHOIC CHAMBER, 1 W / 1 m
HOW TO CHOOSE THE RIGHT AMPLIFIER
The power amplifier must be able to supply twice the RMS driver power. This
3 dB headroom is necessary to handle the peaks that are common to
musical programs. When the amplifier clips those peaks, high distortion
arises and this may damage the transducer due to excessive heat. The use
of compressors is a good practice to reduce music dynamics to safe levels.
FINDING VOICE COIL TEMPERATURE
It is very important to avoid maximum voice coil temperature. Since moving
coil resistance (R ) varies with temperature according to a well known law,
E
we can calculate the temperature inside the voice coil by measuring the
voice coil DC resistance:
T , T = voice coil temperatures in °C.
A B
R , R = voice coil resistances at temperatures T and T , respectively.
A B A B
a= voice coil wire temperature coefficient at 25 °C.
25
÷
÷
ø
ö
ç
ç
è
æ
a
+-
÷
÷
ø
ö
ç
ç
è
æ-+=
25
A
A
B
AB
1
25T1
R
R
TT
HARMONIC DISTORTION CURVES W/ HL14-25 HORN, 1 W / 1 m.
RESPONSE AND IMPEDANCE CURVES W/ PLANE-WAVE TUBE, 1 mW
Frequency response and impedance curves measured with 25 mm
terminated plane-wave tube.
®
Kapton : Du Pont trademark.
L O U D S P E A K E R S
D250-X driver
coupled to a
HL14-25 horn
Response Curve.
Impedance Curve.
Response Curve.
Distortion Curve, 2nd harmonic.
Distortion Curve, 3rd harmonic.
Response Curve.
Impedance Curve.
PROFESSIONAL LINE - Compression Driver
D250-X
60
80
100
140
dB
BB
KK
500 20k
Hz
200
120
1k 2k 5k 10k
BB
KK
500 20k
Hz
200 1k 2k 5k 10k
70
80
90
100
110
120
dB
0
5
10
20
25
ohms
15
BB
KK
500 20k
Hz
200 1k 2k 5k 10k
70
80
90
100
110
120
dB
0
5
15
20
25
ohms
130
140
150
120
110
100
1mW
1W
10
1 kHz
8 kHz
2 kHz500 Hz
4 kHz
30°
210°
60°
240°
90° 270°
120°
300°
150°
330°
180°
0
-6
-10
-20
dB
30°
210°
60°
240°
90° 270°
120°
300°
150°
330°
180°
0
-6
-10
-20
dB
30°
210°
60°
240°
90° 270°
120°
300°
150°
330°
180°
0
-6
-10
-20
dB
30°
210°
60°
240°
90° 270°
120°
300°
150°
330°
180°
0
-6
-10
-20
dB
30°
210°
60°
240°
90° 270°
120°
300°
150°
330°
180°
0
-6
-10
-20
dB
Polar Response Curve.
Response Curve.
Distortion Curve, 2nd harmonic.
Distortion Curve, 3rd harmonic.
40
60
80
120
dB
BB
KK
500 20k
Hz
200
100
1k 2k 5k 10k
www.seleniumloudspeakers.com
Specifications subject to change
without prior notice.
Code: Rev.: - /
01 07 10
N/A

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