About: DS18 PRO-HY8.4B 8" Mid-Range Water Resistant Loudspeaker with Built-in Driver 250W RMS -  4 Ohm (Each) 

DS18's HYBRID speakers give you the best of both worlds of mids and highs combined into one pro audio combination speaker. This high powered pro audio mega speaker combines both a 8" high volume midrange speaker that also has a high wattage driver attached to the rear to give you a full range of frequencies at an amazingly loud volume. These Hybrids have water resistant cones to help battle elements and are perfect for people looking to place a high wattage, high volume loudspeaker together without having to separately mount am additional driver.

Product Highlights:

• Hybrid design combines high wattage midrange and driver together in one beautiful frame.
• High volume 8" and 1" driver rated at 250w RMS and 500 Max for crazy loud volume in a full range of frequencies.
• Water resistant cone to help battle elements and moisture making them great for motorcycles, boats, and regular vehicles too!

Specifications:

• Nominal Diameter: 8"
• Nominal Impedance: 4 Ohms
• RMS Power Handling: 250 Watts
• Peak Power Handling: 500 Watts
• Sensitivity: 97dB
• Frequency Response: 80Hz - 20KHz
• Recommended Hi Pass Crossover: 100 Hz
• Sold Individually 

Midrange Specifications: 

• Voice Coil Diameter: 1.5” (38.6 mm)
• Voice Coil Former Material: Glass Fiber
• Winding Material: CCAW
• Cone Material: Water Resistant Paper
• Surround Material: Cloth
• Basket Material: Aluminum
• Basket Color/Finish: Glossy Red
• Magnet Material: Ferrite
• Magnet Weight: 27 oz
• Displacement Volume: 0.051L

Thiele & Small Parameters

• Equivalent Volume (Vas): 10.048L
• Excursion (Xmax): 9.2 mm
• Free Air Resonance (Fs): 135 Hz
• Mechanical Factor (Qms): 5.96
• Electrical Factor (Qes): 1.321
• Total Factor (Qts): 1.011
• Mechanical Mass (Mms): 9.69g
• Mechanical Compliance (Cms): 137.345 mm/N
• BL Factor (BL): 4.58
• Voice Coil Inductance (Le): 4.22mH
• Cone Area (Sd): 226.98 Cm2
• DC Resistance (Re): 3.4 ohms
• Mechanical Mass w/o Air (Mmd): 7.724 g

Driver Specifications: 

• Voice Coil Diameter: 1” (25.4 mm)
• Voice Coil Former Material: Kapton
• Winding Material: CCAW
• Diaphragm Material: Titanium
• Magnet Material: Neodymium
• Horn Diameter: 3.26"

Measurements:

• Overall Diameter: 8.31" (211 mm)
• Overall Depth: 4.65" (118.2 mm)
• Front Mount Baffle Cutout: 7.1" (180.3 mm)
• Mounting Depth: 4.29" (109 mm)
• Motor Diameter: 4.59" (116.6 mm)