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c2020H Maximum Output 300 mm Midrange/Low Frequency Transducer
JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
A Harman International CompanySS 2020H
CRP 10M
9/98
TYPICAL RESPONSE and
IMPEDANCE CURVES
Frequency response contour of the 2020H taken in a hemispherical
free-field environment, a closed box of 280 liters (10 ft 3) internal
volume enclosing the rear of the driver. Input signal is 2.83 V @
1 m. Measured response of a typical production unit, including all
peaks and dips, does not deviate more than 2 dB from the above
curve. The dotted line represents measured 45 degree off-axis
response. The dashed curve represents the response when the dri-
ver is mounted in a 42.5 liter (1.5 ft
3) enclosure tuned to 40 Hz. The
impedance magnitude curve is measured in the 280 liter (10 ft 3)
sealed enclosure.
DISTORTION vs. FREQUENCY
Measurements taken with an input of 15.5 V @ 1 meter (30 watts at
8 ohms). Distortion levels shown have been raised by 20 dB. The
dashed line shows 2nd harmonic and the dotted line shows the 3rd
harmonic. Note the lack of 3rd harmonic at high frequencies.
JBL continually engages in research related to product improvement. Some materials,
production methods and design refinements are introduced into existing products
without notice as a routine expression of that philosophy. For this reason, any current
JBL product may differ in some respect from its published description, but will always
equal or exceed the original design specifications unless otherwise stated.
Specifications:
Nominal Diameter: 300 mm (12 in)Rated Impedance: 8 ohmsPower Capacity 1:300 W AES continuous pink noise Sensitivity 2: 103 dB, 1 W, 1 m (3.3 ft) Frequency Range 3: 50 Hz - 5.5 kHz
Power Compression4:
at -10 dB power (30 W): 0.5 dB
at -3 dB power (150 W): 1.7 dB
at rated power (300 W): 2.8 dB
Distortion 5:
2nd harmonic: <1%
3rd harmonic: <1% Highest Recommended Crossover: 5 kHzRecommended Enclosure Volume: 30 - 90 liters (1.05 - 3.2 ft 3) Effective Piston Diameter: 260 mm (10.2 in)
Maximum Excursion
Before Damage: 16 mm (0.65 in) Minimum Impedance: 7 ohms ± 10% @ 25° CVoice Coil Diameter: 76 mm (3 in)Voice Coil Material: Edgewound Aluminum Ribbon Voice Coil Winding Depth: 15.2 mm (0.6 in) Magnetic Gap Depth: 12.7 mm (0.5 in) Magnetic Assembly Weight:: 7.7 kg (17 lb) Bl Factor: 18.3 tesla meters Flux Density: 1.0 tesla Effective Moving Mass: 44 g
Polarity: EIA (Positive voltage to RED
terminal gives forward cone
motion) THIELE/SMALL PARAMETERS 6:fs: 60 HzRe: 4.8 ohms Qts: 0.23 Qms: 4.6 Qes: 0.24 Vas: 65 LSd: 0.053 m 2(82.2 in 2) Xmax (10 % THD): 5 mm (0.20 in) Vd: 265 cm 3(16.75 in 3) Le: N/A (Purely resistive at 1 kHz) h0(half-space): 5.32%Pe(Max) 1: 300 W continuous pink noise
MOUNTING INFORMATION: Overall Diameter: 311 mm (12.2 in) Bolt Circle Diameter: 294 mm (11.6 in)
Baffle Cutout Diameter:
Front Mount: 280 mm (11.0 in)
Rear Mount: 284 mm (11.2 in)
Depth: 152 mm (6 in) Volume Displaced by Driver: 4 liters (0.11 ft 3) Net Weight: 8.6 kg (19 lb) Shipping Weight: 9.5 kg (21 lb)
1AES standard (60 - 600 Hz pink noise)2Sensitivity is based on a swept 500 - 2500 Hz signal for an input of 2.83 V @ 8 ohms.3Frequency range is defined as the frequency extremes over which the response is
-10 dB relative to the rated sensitivity.
4Power compression is the sensitivity loss at the specified power, measured from 60 to
600 Hz, after a 5 minute AES standard pink noise preconditioning test at the specified
power.
5Distortion is measured at -10 dB rated power, from 100 to 500 Hz.6Thiele/Small parameters are measured after 2 hour exercise period using a 300 W AES
power test and reflect the expected long-term parameters once the driver has been
installed and operated for a short period of time.
Impedance (ohms)
