Grave amplificado com muito pouco uso e tudo ok.

Specifications:
System Type:Self powered 18", bass-reflex designFrequency Range (-10 dB):36 Hz - 130 HzFrequency Response (±3 dB):42 Hz - 100 HzCrossover Frequency:120 Hz (HPF selectable on outputs)System Power Rating: 500 W continuous, 1000 W peakDistortion:Less than 0.1% at rated powerMaximum SPL:129 dBSignal indicators:Limit: Red LED indicates input overload conditionSignal: Green LED indicates signal presentInput Gain:- Infinity to +4 dBuInput Impedance:Nominal 20k Ohms (balanced)Polarity:0°or 180°phase shiftLF Driver:1 x JBL 268G 460 mm (18”) Differential Drive
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integrated woofer with dual voice coils, 4 ohm impedanceEnclosure:18 mm, plywoodSuspension / Mounting:36 mm pole socket on topFinish:DuraFlex™ finishGrille:Powder coated perforated steel with acoustically transparentblack screen backing.Input Connectors: Balanced XLRs with loop through (stereo) to balanced XLR satellite outputs.
Dimensions (H x W x D):617 mm x 569 mm x 652 mm (24.3 in x 22.4 in x 25.7 in)Net Weight:29.5 kg (65 lb)
JBL continually engages in research related to product improvement. Some materials, production methods and designrefinements are introduced into existing products without notice as a routine expression of that philosophy. For thisreason, any current JBL product may differ in some respect from its published description, but will always equal orexceed the original design specifications unless otherwise stated.
Portable Self-Powered 18",Bass-Reflex Design
Professional Series
EON518S