If you need low-end and lots of it for your performances, you already know there's nothing like a subwoofer. You probably also know that buying a sub and a crossover and another amp to power it means you'll need to spend a lot to get that bass. The MP255S changes all that.
First, the MP255S is among the most affordable subs in its class. But there's more to the story than just great value in a high-performance subwoofer. You see, the MP255S is a bandpass design. This means that it uses 2 tuned chambers to shift its energy down into the low frequency region where you really need it.
And it's also got a low-pass filter to get rid of the remaining mid-range output. So all you hear from the MP255S is bass, with no mid-range output to interfere with your main speaker system. So you can simply plug the MP255S into your existing amplifier* and get immediate gratification without buying another amp and crossover.
Then when you and your finances are ready, add an amp and crossover to take your system to the next level.
Features
Dual 15 in. band-pass design puts the energy in the bass region where it's needed for "punch" and power.
Dual Neutrik¬ Speakon¬ NL-4 input connectors provided for secure connection and loop-through capability. Input connections may be reconfigured for pin 1± or pin 2± for compatibility with any cabling scheme.
Enclosure constructed of 7-ply, 18mm plywood using tongue-and-groove joint detail for durability and years of service.
Covered in premium grade, 12 oz. carpet — the most durable and attractive carpet covering available.
4 heavy-duty casters mounted on the rear of the enclosure for easy transport.
35mm pole mount receptacle. 24 in. (610mm) steel pole included for Sub/Satellite systems.
Empowering Music Professionals
In developing the MPro line, JBL looked at the way music professionals are using live sound speakers today. Many MPro attributes such as extended frequency response, compact size, and easy handling are a direct result. The MPro 200 Series offers unique, professional appearance, superb acoustical performance, cutting edge configurations, buyer confidence that goes with the JBL brand Carpet covered, plywood enclosures, and 250 watt power ratings (500 watts for dual woofer models). MPro 200 Series models are covered in the highest grade, 12 oz. carpet. Note that the edges of the carpet on all 2-way models are captured by the joint detail. This means you won't see the carpet seams and the carpet won't peel back.
Cabinet Construction
All MPro models are constructed of 7-ply, 18mm plywood — not lower cost "engineered wood" products. Plywood construction assures a tough enclosure and robust joints that hold together through a tough life on the road. Carefully fitted rabbet joints and tongue-and-groove construction techniques are used throughout the line. State-of-the-art adhesives are used for glue joints that are actually far stronger than the plywood.
Laminar Flow Baffle
Used on all 2-way models, the Laminar Flow Baffle integrates horn, ports, baffle and woofer mounting. The term "Laminar Flow" is used by aerospace engineers to describe the smooth flow of air over a surface — the opposite of turbulent flow. In aircraft design, turbulence produces unwanted drag and unpredictable handling. In a speaker system, turbulence and diffraction create distortion and undesirable phase cancellations. The smooth, rounded contours of the baffle and seamless one-piece structure reduce the effects of turbulence and diffraction. The result is lower distortion and smoother frequency response.
Laminar Flow Baffle Benefits
Smooth ports with rounded edges reduce distortion caused by turbulence.
Concave shape and recessed woofer mounting reduce diffraction effects that harm frequency response.
Molded baffle allows for large horn mouth without growing the size of the system. The result is improved performance in the critical mid-range.
The Laminar Flow Baffle is constructed of SMC (Sheet Molding Compound). A tough, polymer used extensively in the auto industry for body panels and other parts.
Hardware
Only the most rugged hardware is used on MPro products.
Large, ergonomically positioned steel handles
16-gauge, hexagonally perforated steel grills
Cast aluminum pole mount sockets (MP418 models use steel cup)
Heavy-duty, rattle-resistant, 3 in. casters on selected subwoofer models
Technical Info
System Type: Dual 15 in., band-pass subwoofer
Frequency Range (-10 dB): 34 Hz - 200 Hz
Frequency Response (±3 dB): 40 Hz - 180 Hz
Sensitivity (1w/1m): 98 dB SPL
Nominal Impedance: 4 ohms
Rated Maximum SPL: 131 dB peak, @ 1 m (3.3 ft)
Power Capacity:* 500 watts (IEC filtered noise, 100 hours)
Peak Power Capacity:* 2,000 watts
Low Pass Filter: 300 Hz, 6 dB / octave
Dimensions (H x W x D): 950.2 x 527.1 x 940.2mm (37.4 x 20.75 x 37.0 in.)
Net Weight: 52.2 kg (115 lbs.)
Drivers: 2 x JBL M115-8A
Input Connectors: Neutrik ¬ Speakon ¬ NL-4 (x2); factory wired for pins 1± operation, user configurable for 2± operation
Enclosure Construction: Dark gray carpet covered, 7 ply, 18mm plywood using tongue-and-groove joint detail
Transportability: 2 swivel and 2 fixed 3 in. casters; 4 steel handles
Included Accessories: 24 in. (610mm), 35mm (diameter) steel pole
* "Power Capacity" and "Peak Power Capacity" ratings are based on the average and peak power handling capacity of product samples subjected to a 100-hour power test of the system design using IEC filtered random noise with a crest factor of 6 dB.
