About: DS18 PRO-X6.4BMSL 6.5" Shallow-Mount Midrange Speaker 250 Watts RMS - 4 Ohm (Each) 

The PRO-X6.4BMSL is a slim mid-range designed to take your sound system to EXTREME levels of performance. Featuring a 1.5" Kapton Voice Coil, the PRO-X6.4BMSL is built to withstand the most intense jam sessions without compromising on quality, so you can play your music as long as you want. Engineered for compatibility, the PRO-X6.4BMSL has a reduced mounting depth and an RMS Power Rating of 200W allowing it to effortlessly integrate into any build.

Equipped with an innovative Bullet Resonator, the PRO-X6.4BMSL is insanely versatile. From deep and powerful bass at 80Hz to crystal-clear highs reaching 5KHz, the PRO-X6.4BMSL delivers a complete audio experience. Its high 93dB sensitivity ensures accurate tonal reproduction even at extreme volumes. The PRO-X6.4BMSL strikes the perfect balance between size and performance. Redesigned with meticulous attention to detail, it features a sturdy steel basket with a vibrant red gloss finish so you can get LOUD in style. Complete your sound system today with DS18’s PRO-X6.4BMSL.

Product Highlights:  

• 6.5" Shallow Mid-Range w/Bullet
• MAX Power: 400 Watts
• RMS Power: 200 Watts
• Impedance: 4-Ohm
• Ferrite Magnet
• 95dB

Specifications:

• Nominal Diameter: 6.5" (165 mm)
• Nominal Impedance: 4 ohms
• RMS Power Handling: 200W
• MAX Power Handling: 400W
• Sensitivity (1w/1m): 95db
• Frequency Response: 80Hz - 5KHz
• Recommended HI Pass Crossover: 130Hz
• Sold in Pair or Single:Single
• Grill Included: No

Motor:

• Voice Coil Diameter: 1.5" (38.1 mm)
• Voice Coil Former Material: Kapton
• Winding Material: CCAW
• Cone Material: Non-Pressed
• Bullet Material: Aluminum
• Bullet Color/Finish: Glossy Red
• Surround Material: Cloth
• Basket Material: Steel
• Basket Finish / Color: Glossy Red
• Magnet Material: Ferrite 

Thiele & Small Parameters:  

• Equivalent Volume (Vas): 4.51L / 0.159ft3
• Excursion (one way) (Xmax): 6.4 mm
• Free Air Resonance (Fs): 140Hz
• Mechanical Factor (Qms): 6.59
• Electrical Factor (Qes): 0.81
• Total Factor (Qts): 0.72
• Moving Mass (Mms): 6.92g
• Compliance (Cms): 0.19mm/N
• BL Factor (BL): 4.99
• Voice Coil Inductance (Le): 0.03mH
• Cone Area (Sd): 130.7Cm2
• DC Resistance (Re): 3.3 ohms

Measurements:

• Overall Diameter: 6.65" (169 mm)
• Front Mount Baffle Cutout: 5.63" (143 mm)
• Mounting Depth: 2.15" (54.5 mm)
• Overall Depth: 2.36" (60 mm)
• Motor Diameter: 4.3" (110 mm)
• Product Weight: 4 lbs
• Product Dimensions: 7 x 7 x 2.75