JBL D250 X Rev. 01 07 10 I Spec Sheet

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PROFESSIONAL LINE - Compression Driver

D250-X

LOUDSPEAKERS

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.

DRIVER x HORN CONNECTION

SPECIFICATIONS
Nominal impedance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Minimum impedance @ 615 Hz. . . . . . . . . . . . . . . . . . . . . . . 7.2

HC5625-SLF

W
W

POWER USING CROSSOVER (12dB/oct)
ACTIVE
PASSIVE
AES (HPF 500 Hz)5 . . . . . . . . . . . . . . . . . . . . . . . . . . . 40. . . . . . . -- W
5
AES (HPF 1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 . . . . . . .-- W
MUSICAL PORGRAM (HPF 500 Hz)1 . . . . . . . . . . . . . 80 . . . . .150 W
MUSICAL PROGRAM (HPF 1kHz)1 . . . . . . . . . . . . . . 86. . . . . 200 W

HC23-25

HM25-25

Sensitivity
On horn, 2.83V@1m, on axis2 . . . . . . . . . . . . . . . . . . 107 dB SPL
On plane-wave tube,0.0894V3 . . . . . . . . . . . . . . . . . . 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

HM17-25
D250-X

HM11-25
HL14-25

1
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.
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
Test with duration of 2h with pink noise (from 6dB crest factor) and filtered a decade of
often-cut.

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
Volume displaced by driver. . . . . . . . . . . . . . . . . . . . 0.5 (0.018) l (ft3)
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)

HL40-25

HL50-25

ø 112

76

W1 3/8" - 18TPI

ø 25

MOUNTING INFORMATION
Horn connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Screw-on 1 3/8” - 18 TPI
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Push terminals
Polarity . . . . . . . . . . . . . . . . . Positive voltage applied to the positive terminal
(red) gives diaphragm motion toward the throat

60

16

Dimensions in mm.

PROFESSIONAL LINE - Compression Driver

D250-X

LOUDSPEAKERS

HARMONIC DISTORTION CURVES W/ HL14-25 HORN, 5 W / 1 m.

RESPONSE AND IMPEDANCE CURVES W/ HL14-25 HORN INSIDE AN
ANECHOIC CHAMBER, 1 W / 1 m

110

20

100

15

140

120

dB
90

10

80

5

dB

25

ohms

120

100

80

70

60

0
200

500

1k

2k
Hz

5k

10k

Response Curve.
Impedance Curve.

B

500

200

20k

1k

2k
Hz

5k

10k

Response Curve.
Distortion Curve, 2nd harmonic.
Distortion Curve, 3rd harmonic.

K

20k
B

K

RESPONSE AND IMPEDANCE CURVES W/ PLANE-WAVE TUBE, 1 mW
1W 1mW
150 120

25

140 110

20

POLAR RESPONSE CURVES
500 Hz
30°

15

110

80

240°
150°

70

0
200

500

1k

2k
Hz

5k

10k

Response Curve.
Impedance Curve.

K

Frequency response and impedance curves measured with 25 mm
terminated plane-wave tube.

330°

30°
300°

300°

-20
dB

270°

240°

120°

210°

210°

0
-6

150°

180°

210°

330°

-10

60°

300°

-20
dB

270° 90°

240°
180°

330°

8 kHz

120°
150°

180°

0
-6
-10

60°

270° 90°

240°
150°

-20
dB

90°

30°
300°

120°

210°

-10

60°

20k
B

0
-6

2 kHz
330°

-20
dB

4 kHz

5
30°

100

180°

0
-6
-10

60°

270° 90°

120°

10

30°
300°

-20
dB

90°

ohms

dB

90

120

1 kHz
330°

-10

60°

130 100

0
-6

D250-X driver
coupled to a
HL14-25 horn

270°

240°

120°
150°

180°

210°

Polar Response Curve.

HARMONIC DISTORTION CURVES W/ HL14-25 HORN, 1 W / 1 m.
120

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.

dB

100

80

FINDING VOICE COIL TEMPERATURE
It is very important to avoid maximum voice coil temperature. Since moving
coil resistance (RE) varies with temperature according to a well known law,
we can calculate the temperature inside the voice coil by measuring the
voice coil DC resistance:

60

æR
öæ
1
TB = TA + çç B - 1÷÷ çç TA - 25 +
a 25
è RA
øè

40
200

500

1k

Response Curve.
Distortion Curve, 2nd harmonic.
Distortion Curve, 3rd harmonic.

2k
Hz

5k

10k

20k
B

K

TA , TB= voice coil temperatures in °C.
RA , RB= voice coil resistances at temperatures TA and TB, respectively.
a25= voice coil wire temperature coefficient at 25 °C.

®

Kapton : Du Pont trademark.

Specifications subject to change
without prior notice.
Code:N/A

Rev.: 01 - 07 / 10

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www.seleniumloudspeakers.com



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