R2SD2/D4-10

The Rockford Fosgate R2SD2-10 and R2SD4-10 from the PRIME R2S Series are high-performance 25 cm (10") subwoofers with an exceptionally shallow mounting depth. Thanks to their slim design, they are ideal for vehicles with limited space, without sacrificing powerful and precise bass reproduction.

The mineral-reinforced polypropylene diaphragm ensures high stability and controlled bass reproduction. The robust steel basket with ventilation openings helps cool the driver system, while the 50-mm voice coil mounted on an anodized aluminum carrier ensures reliable power handling.

Thanks to the dual voice coil, both models offer flexible connection options for a variety of amplifiers. The flat motor design allows for an installation depth of just 87 mm. The subwoofers are specifically optimized for sealed enclosures but can also be used in tuned bass-reflex enclosures.

Technical Specifications

General Characteristics

• Subwoofer diameter: 25 cm (10 inches)

• Series: Rockford Fosgate PRIME R2S Shallow

• Design: Passive flat subwoofer

• RMS Power Handling: 200 watts

• Maximum power handling: 400 watts

• Frequency range: 45–250 Hz

• Voice coils: 2 × 50 mm (dual voice coil)

• Voice coil former: Anodized aluminum

• Voice coil winding: 4 layers

• Diaphragm material: Mineral-reinforced polypropylene

• Bead: Foam

• Dust-proof cap: polypropylene

• Basket material: Stamped steel

• Centering: Single centering spider

• Terminals: Screw terminals up to 12 AWG

• Drive: Space-saving shallow motor design

• Magnet weight: approx. 1.28 kg
  
  

Model R2SD2-10 – 2 × 2 ohms

• Impedance: 2 × 2 ohms

• Parallel termination impedance: 1 ohm

• Series impedance: 4 ohms

• DC resistance (Re): 2 × 1.9 ohms

• Resonance frequency (Fs): 38.1 Hz

• Mechanical Grade (Qms): 8.00

• Electrical quality (Qes): 0.74

• Overall Quality (Qts): 0.68

• Equivalent volume (Vas): 20.4 liters

• Mass in motion (Mms): 134.2 g

• Force factor (BL): 12.8 N/A

• Voice coil inductance (Le): 4.2 mH

• Sensitivity (SPL): 83 dB (1 W/1 m)
  
  

Model R2SD4-10 – 2 × 4 ohms

• Impedance: 2 × 4 ohms

• Parallel termination impedance: 2 ohms

• Series impedance: 8 ohms

• DC resistance (Re): 2 × 3.3 ohms

• Resonance frequency (Fs): 39.3 Hz

• Mechanical Quality (Qms): 7.00

• Electrical Quality (Qes): 0.81

• Overall Quality (Qts): 0.73

• Equivalent volume (Vas): 21.7 liters

• Mass in motion (Mms): 126.1 g

• Force factor (BL): 15.6 N/A

• Voice coil inductance (Le): 4.2 mH

• Sensitivity (SPL): 82.5 dB (1 W/1 m)
  
  

Diaphragm and Mechanical Properties

• Effective membrane area (Sd): 333 cm²

• Linear displacement (Xmax): ±4 mm

• Maximum mechanical deflection: ±20 mm

• Voice coil winding height R2SD2-10: 22.5 mm

• Voice coil winding height R2SD4-10: 22.2 mm
  
  

Recommended Enclosure – Enclosed

• Recommended net volume: 19.8 liters

• Lower cutoff frequency (F3) R2SD2-10: 45 Hz

• Lower cutoff frequency (F3) R2SD4-10: 46 Hz
  
  

Enclosure Recommendation – Bass Reflex

• Recommended net volume: 39.6 liters

• Bass reflex port diameter: 100 mm

• Bass reflex port cross-sectional area: 80 cm²

• Bass reflex port length: 35 cm

• Tuning frequency (Fb): 42 Hz

• Lower cutoff frequency (F3): 33 Hz
  
  

Dimensions and Weight

• Outer diameter: 276 mm

• Installation diameter: 232 mm

• Installation depth: 87 mm

• Mounting hole pattern: approx. 258 mm

• Displacement: approx. 1.05 liters

• Shipping weight: approx. 4.9 kg
  
  

What's Included

• 1 × Rockford Fosgate R2SD2-10 or R2SD4-10 subwoofer (depending on the selected model)

• 1 × User and Installation Manual