Video of MS40:

 What's In the Box:

• 2 Speakers
• Installation Hardware: (8 Stainless Steel Screws + 8 Stainless Steel Speed Clips)
• Mounting Template
• Owner's Manual
• Warranty Card

Features:

• Pair Rockville MS40B 4" 200 Watt Waterproof Marine Boat Speakers
• Peak Power: 200 Watts per pair / 100 Watts each
• RMS Power: 50 Watts per pair / 25 Watts each
• Color: Black
• Injection Molded Polypropylene Cone
• Aluminum voice coil with ASV winding
• Cloth surrounds
• Impedance: 4 Ohm
• Frequency Response: 122Hz – 20 Khz
• Sensitivity: 85dB @1w/1m
• High quality magnet: 3.5 Oz Y30 Ferrite magnet
• 1” inch ASV voice coil
• IP56 waterproof rating
• Fully Marinized Against Salt & Fresh Water Conditions
• Completely Waterproof and rustproof at level IP56
• Anti-UV molded ABS plastic basket & grill
• Pre-installed mounting screws included
• Perfect for marine, outdoor, and car use
• 1” inch Tweeter: (Mylar Diaphragm with NdFeB magnet)
• Injection Molded Polypropylene Dust Cap
• SPL: 85dB ± 2dB (at 1M / 1W)
• Resonant Frequency (F0) 122Hz + or – 20% at 1V
• 3MM plate and 3 MM T-yoke
• Total Diameter: 5.12”
• Cutout Diameter in Inches for Mounting: 3.66”
• Total Height: 2.36”
• Mounting Depth in inches:1.57’’
• Shipping weight: 1.76 Lbs
• Shipping Dimensions:6” x 6” x 5.7”

T/S Parameters:

• Magnet details: F60*F24*8 Y30
• Fs:154.7 Hz
• Re:3.2 ohms
• Qes:2.57
• Qts:1.611
• Qms:4.315
• Vas:0.847L
• Cms:210.222UM/N
• Bl:2.468T
• MMS:5.029g
• XMAX:1.5 mm
• SD:54 cm2