Discover the Power Tuned 9918b ESP from DD Audio, an 18-inch subwoofer packed with innovative features. Equipped with a CFB-Carbon Fiber Blend Cone and a Vario-Density Extended Range of Motion Surround, this subwoofer offers maximum control at high excursion for dynamic bass reproduction. Additionally, the unit features a Tuned Spider System for selected performance characteristics and a Super-Frame for maximum spider diameter and heat dissipation. It also includes a patented ferrite magnet system and the option for a SuperCharge upgrade. With a peak power handling of 10,000 watts and an RMS power handling of 2,500 watts, the Power Tuned 9918b ESP delivers powerful, crystal-clear sound that will please any music lover.

• 46cm (18 inch) Subwoofer
• Power Handling (RMS): 2500 Watts
• Peak Power Handling: 10000 Watts
• Impedance Options: Dual 1 Ohm or Dual 2 Ohm
• Patented Ferrite Magnet System
• Lossless Linear Suspension
• Ribbed Foam Surround
• Magnet Protection Cap including Grill over Pole Piece Vent
• Aluminum Die-Cast Basket

Specifications

• Frequency Response 10Hz - 500Hz
• DC Resistance (Re) 0.9 Ohm
• Resonant Frequency (Fs) 26.24 Hz
• Mechanical Q (Qms) 2.265
• Electrical Q (Qes) 0.51
• Total Q (Qts) 0.47
• Equivalent Volume (Vas) 161.9 L
• Xmax ±22mm
• Magnet Weight 1500 Oz
• Voice Coil Diameter 4 inch (101.6mm)

The SuperCharge Option

• With the SuperCharge option, you hear an even tighter and cleaner bass across the entire power range.
• What exactly happens during SuperCharging? By adding a specially shaped neodymium shorting ring on a flush-cut pole piece, with opposite polarity facing down, you redirect otherwise lost magnetic energy into the voice coil gap. This increases the usable motor strength by 20-25%, allowing smaller, lighter motors to have the same drive energy as larger motors.
• You cannot run a SuperCharged subwoofer at higher power, and the SPL value does not increase, but you hear a cleaner output at higher levels. SuperCharged subwoofers use the power you give them more efficiently, but you still have the same heat dissipation and the same voice coil area. This means the power handling is the same as the standard model.
• Note: SuperCharge subwoofers are made to order. Delivery time is 4-6 weeks in addition to the stated delivery time.

ESP Subwoofer Features

• Carbon Fiber Blend Cone (CFB) - The CFB composition uses an effective carbon fiber-based cocktail to provide you with the highest strength-to-weight ratio in the industry.
• Vario-Density Extended Range of Motion Surround (V-ROM) - Offers ultimate linear control at high excursion while enabling a dynamically sounding bass reproduction. The control ribs are compressed to a lower density than the main surround body to allow a seamless control system. The harder you control it, the more control you get.
• Tuned Spider System (TSS) - Each suspension is tuned for specific performance characteristics, e.g., High Definition, Power Handling, X-Stiff Control.
• Super-Frame (SFrame) - Maximizes spider diameter, cone diameter, suspension excursion, and acts as a secondary shorting ring, providing additional heat dissipation for better heat flow from the coil.
• SuperCharge Option available!