The JBL Control 31 delivers high-fidelity performance with a compact design, featuring advanced components and a computer-optimized horn for smooth and powerful sound. Its 250 mm (10 inch) low-frequency driver includes a woven fiberglass cone for weather resistance and a pure butyl rubber surround that ensures clean sound quality. The high-temperature fiberglass voice coil former enhances sensitivity and output capability, ensuring stable performance even under prolonged high-power use. The driver’s optimized cone geometry provides a smooth frequency response and excellent off-axis performance, while the linear suspension spider and FEA-optimized motor construction minimize distortion. An aluminum coupler ring further reduces harmonic distortion and increases sensitivity.
The high-frequency compression driver features a patented design with a high-temperature polymer diaphragm and fluid-cooling, delivering high output with low distortion. JBL’s ImageControl™ process has optimized the high-frequency waveguide for accurate control, smooth frequency response, and consistent sound quality across the listening area. The speaker offers 110° x 110° symmetrical coverage, ensuring uniform sound dispersion whether installed vertically or horizontally.
For installation, the Control 31 includes the InvisiBall mounting system, allowing up to 41° horizontal and 36° or 23° vertical rotation, depending on orientation. It also features an 8-ohm impedance setting in the Thru position, accommodating up to two speakers per 4-ohm amplifier channel. The speaker’s weather resistance is enhanced with a rear-loaded basket, weather-capable polymer diaphragm, and a thermoset composite coated grille that withstands UV and humidity. The grille is backed with WeatherMax™ foam and tight-weave screening to prevent water intrusion, while nickel/zinc rust-resistant terminals ensure a secure connection. The included MTC-PC2 cover provides additional protection for the terminals. The white version of the Control 31 is painted with a UV-resistant finish to prevent yellowing.
Specifications
Here are the revised specifications in a concise, bullet-point format:
– **Frequency Range**:
– -10 dB: 33 Hz – 19 kHz
– ±3 dB: 42 Hz – 14 kHz
– **Power Ratings**:
– 250 W (1000 W peak) for 2 hours
– 200 W (800 W peak) for 100 hours
– **Maximum SPL @ 1m**:
– 116 dB continuous
– 123 dB peak
– **Nominal Sensitivity**: 92 dB
– **Coverage Angle**:
– 110° x 110°
– **Directivity Factor (Q)**: 5.7 (averaged 500 Hz to 10 kHz)
– **Directivity Index (DI)**: 7.3 dB (averaged 500 Hz to 10 kHz)
– **Nominal Impedance**: 8 ohms
– **Crossover Type**:
– 2nd order low-pass
– 2nd order high-pass
– Conjugate shaping circuitry
– **Transformer Taps**:
– 70V: 150W, 75W, 38W, 19W
– 100V: 150W, 75W, 38W
– **Insertion Loss**: <0.65 dB at any tap setting
– **Thru Setting**: 8Ω nominal
– **Recommended High-Pass Filter**: 40 Hz, 24 dB/oct for any transformer tap and 8Ω operation
– **Transducers**:
– **Low Frequency**:
– 250 mm (10 in) woven fiberglass cone
– Pure butyl rubber surround
– 52 mm (2 in) voice coil
– High-temperature fiberglass voice coil former
– Optimized cone geometry
– Linear suspension spider
– FEA-optimized motor construction
– Aluminum ring on pole piece
– **High Frequency**:
– JBL 2414H-C compression driver
– 25 mm (1 in) diaphragm and voice coil
– High-temperature polymer diaphragm
– JBL-patented design
– Fluid-cooled
– **Physical**:
– **Enclosure Material**: High impact Polystyrene (HIPS) with 10% glass fill, patent-pending internal 5 mm foamed polyurethane secondary mold
– **Grille**: Zinc-plated, thermoset-composite coated steel with WeatherMax™ multi-layer foam and tight-weave mesh vapor barrier
– **Installation**: InvisiBall wall-mounting system included, ten 6 mm attachment points, optional U-bracket, one 6 mm secondary safety attachment point
– **Environmental**: IP-55 per IEC529, exceeds MilSpec 810 for humidity, salt-spray, temperature & UV, passes Mil-Std-202F for salt spray
– **Termination**: Screw-down terminal strip, accepts up to 9 mm outside, 4 mm inside open lugs, plus bare wire (up to 12 AWG / 2.5 mm²)
– **Agency Rating**: Transformer is listed per UL1876
– **Colors**: Black (RAL9004) or White (-WH, RAL9003)
– **Dimensions**: 593 x 372 x 345 mm (23.3 x 14.6 x 13.5 in)
– **Weight**: 18.8 kg (41.5 lb)
– **Shipping Weight**: 22.0 kg (48.5 lb)
– **Included Accessories**:
– 1 pc MTC-PC2 input panel cover
– InvisiBall wall-mounting system
– 6 mm x 305 mm InvisiBall hex wrench
– **Optional Accessories**:
– MTC-30MK Marine-Kit Grille (black or white)
– MTC-30CM Ceiling-Mount Adapter
– MTC-30UB U-Bracket
– **Transformer Taps**:
– 70V: 300W, 150W, 75W, 38W
– 100V: 300W, 150W, 75W
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