Transcript
MOUNTING INFORMATION
PROFESSIONAL LINE - Super Tweeter
ST350 Super tweeter for outstanding detail and clarity in highfrequencies without harshness. The ST350 AUTO may be used individually in lower power systems or arrayed for increased coverage and SPL in higher power systems. The bullet-shape horn design offers a longer throw 50° x 50° dispersion. The plastic injected housing is stable and durable. The phenolic annular diaphragm is long-lasting, cost-effective and more natural-sounding than metallic diaphragms. The use of high-temperature materials and adhesives improves power handling and produces exceptionally high acoustic output. A precisely engineered diaphragm structure and alignment mechanism for easy, reliable, cost effective repair in case of diaphragm failure.
Number of bolt-holes: 8 Bolt-holes dimension: 4.4 x 5.5 (0.17 x 0.21) mm (in) Distande between bolt-holes (H x V): 80 x 104 (3.15 x 4.09) mm (in) Baffle cutout diameter (front mount): 106 (4.17) mm (in) Connectors: Push terminals Polarity: Positive voltage applied to the positive terminal (red) gives diaphragm motion toward the horn throat
SPECIFICATIONS Nominal impedance: Minimum impedance @ 6,700 Hz:
POWER USING CROSSOVER (12dB/oct) 5 AES (HPF -- Hz) AES (HPF -- Hz)5 6 RMS (NBR 10.303) (HPF 2.000 Hz) 6 RMS (NBR 10.303) (HPF 4.000 Hz) MUSICAL PROGRAM (HPF 2.000 Hz)1 MUSICAL PROGRAM (HPF 4.000 Hz)1
ACTIVE -------
8
Ω
6.5
Ω
PASSIVE W -W -W 75 100 W 150 W 200
Sensitivity On horn, 1W@1m, on axis2
111
Frequency response @ -10 dB:
2,500 to 20,000
Sound dispersion (H x V):
40° 50 x 50
Diaphragm material: Voice coil diameter:
dB SPL
Hz degress Phenolic
42 (1.6)
mm (in)
Re:
6.2
Ω
Flux density:
1.7
T
Minimum recommended crossover (12 dB / oct):
40°
--
Hz
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, 3,000 - 10,00 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. 6 Brazilian standard NBR 10.303, with pink noise during 2 uninterrupted hours.
121
98 4 x Ø5,5
Ø 104
104
Magnet material: Barium ferrite Magnet weight: 470 (16.5) g (oz) Magnet diameter x depth: 102 x 14 (4.02 x 0.55) mm (in) Magnetic assembly weight: 1,210 (2.66) g (lb) ABS X17 polymer Housing material: Housing finish: Black / Silver / Onix Magnetic assembly steel finish: Zinc-plated Voice coil material: CCAW ® Polyimide (Kapton ) Voice coil former material: Voice coil winding length: 2.2 (7.2) m (ft) Voice coil winding depth: 2.0 (0.08) mm (in) Wire temperature coefficient of resistance (a25): 0.00356 1/°C Volume displaced by driver: 0.7 (0.025) l (ft3) 1,420 (3.13) g (lb) Net weight: 1,520 (3.35) g (lb) Gross weight: Carton dimensions (W x D x H): 10.5 x 13.2 x 12.2 (4.1 x 5.2 x 4.8) cm (in)
130
ADDITIONAL INFORMATION
80
81
Dimensions in mm.
17
RESPONSE CURVE MENSURED IN ANECHOIC CHAMBER, 1 W / 1 m 120
HARMONIC DISTORTION CURVES, 7.5 W / 1 m. 120
110 100
dB
dB
100
90 80
80
60
70 2k
3k
5k
Hz
7k
10k B
3k
2k
20k
5k
Hz
7k
10k B
K
Response Curve. Distortion Curve, 2nd harmonic. Distortion Curve, 3rd harmonic.
Response Curve.
20k K
IMPEDANCE AND PHASE CURVES MEASURED IN FREE-AIR. 15
POLAR RESPONSE CURVES
20
2.5 kHz 30°
15
5
10
90°
240°
5 2k
3k
5k
Hz
7k
10k
240° 150°
180°
300°
-20 dB
270° 90°
120°
210°
330°
-10
60°
270°
240°
120°
210°
150°
180°
210°
Polar Response Curve.
K
HARMONIC DISTORTION CURVES, 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.
120
100
dB
300°
0 -6
20k B
Impedance Curve. Phase Curve.
180°
10 kHz 30°
330°
-20 dB
270° 90°
120°
0 -6 -10
60°
300°
-20 dB
150°
0
5 kHz 30°
330°
-10
60°
graus
ohms
10
0 -6
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:
80
öæ æR 1 ö ÷ TB = TA + çç B - 1÷÷ çç TA - 25 + a 25 ÷ø è RA øè
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.
60
40 2k
3k
5k
Hz
7k
10k
20k B
K
Response Curve. Distortion Curve, 2nd harmonic. Distortion Curve, 3rd harmonic.
Harman Consumer, Inc. 8500 Balboa Boulevard, Northridge, CA 91329 USA www.jbl.com
© 2011 HARMAN International Industries, Incorporated. All rights reserved. Harman do Brasil Indústria Eletrônica e Participações Ltda. is a trademark of Harman International Industries, registered in the United States and/or other countries. Features, specifications and appearance are subject to change without notice.
Code: NA - Rev.: 00 - 09/11
