DS18 SRW8.4D Shallow 8" Subwoofer
Owner's Manual
Product Overview
This document provides detailed information for the DS18 SRW8.4D, an 8-inch shallow subwoofer designed and engineered in the USA. The subwoofer features a nominal impedance of 4+4 Ohms, RMS power handling of 150W, and a maximum power handling of 300W. It is designed for applications requiring a compact yet powerful bass solution.
Specifications
| Specification | Value |
|---|---|
| Nominal Diameter | 8" |
| Nominal Impedance | 4+4 Ohm |
| RMS Power Handling | 150W |
| MAX Power Handling | 300W |
| Sensitivity (1w/1m) | 86 dB |
| Frequency Response | 25-250Hz |
| Recommended Low Pass Crossover | 120Hz |
| Voice Coil Diameter | 1.5" / 38.6mm |
| VC Former Material | Aluminum |
| Winding Material | SV |
| Cone Material | Paper |
| Dust Cap Material | Paper |
| Surround Material | Rubber |
| Basket Material | Steel |
| Basket Color and Finish | Gloss Red |
| Magnet Material | Ferrite |
| Magnet Weight | 32 oz |
| Displacement Volume | 1.13L / 0.039 ft3 |
| Equivalent Volume (Vas) | 6.7L / 0.23ft3 |
| Free Air Resonance (Fs) | 66 Hz |
| Mechanical Factor (Qms) | 6.122 |
| Electrical Factor (Qes) | 0.9 |
| Total Factor (Qts) | 0.785 |
| Mechanical Mass (Mms) | 55.916g |
| Mechanical Compliance (Cms) | 0.104 mm/N |
| BL Factor (BL) | 12.954 |
| Voice Coil Inductance (Le) | 17.5 mH |
| Cone Area (Sd) | 213.82 Cm2 |
| DC Resistance (Re) | 3.4+3.4 Ohm |
| Efficiency Bandwidth Product (EBP) | 73.3 |
| Mechanical Mass Without Air (Mmd) | 52.383g |
Measurements
Key dimensions for the DS18 SRW8.4D subwoofer:
- Overall Diameter: 8.46" / 215mm
- Overall Depth: 3.46" / 88mm
- Front Mount Baffle Cutout: 7.12" / 181mm
- Mounting Depth: 2.95" / 75mm
- Motor Diameter: 4.72" / 120mm
Frequency Response
The frequency response graph illustrates the subwoofer's performance, showing Sound Pressure Level (SPL) in decibels (dBSPL) against frequency in Hertz (Hz). The output is strongest in the bass frequencies, peaking between 80Hz and 100Hz at approximately 95-100 dBSPL, with a gradual decline at higher frequencies. Phase response is also depicted.
Recommended Enclosure Dimensions
The following are recommended dimensions for building enclosures for the DS18 SRW8.4D subwoofer.
Single Subwoofer Sealed Box
Box External Dimensions: 23.62" (Width) x 9.84" (Height) x 5.26" (Depth)
Material Thickness: 0.51" / 13 mm
Net Internal Volume: 0.45 ft³
Wood Cuts (Qty 2 each):
- Top-Bottom (WxH): 23.62" x 5.26"
- Front-Rear (WxH): 23.62" x 8.82"
- Left-Right (WxH): 4.24" x 8.82"
Single Subwoofer Ported Box
Box External Dimensions: 31.50" (Width) x 11.81" (Height) x 5.59" (Depth)
Material Thickness: 0.51" / 13mm
Net Internal Volume: 0.80 ft³
Tuning Frequency: 50 Hz
Port Area: 7.06 inch²
Port Inner Diameter: 3.00"
Port Length: 6.55"
Wood Cuts (Qty 2 each):
- Top-Bottom (WxH): 31.50" x 5.59"
- Front-Rear (WxH): 31.50" x 10.79"
- Left-Right (WxH): 4.56" x 10.79"
Double Subwoofer Ported Box
Box External Dimensions: 33.46" (Width) x 11.81" (Height) x 6.44" (Depth)
Material Thickness: 0.51" / 13mm
Net Internal Volume: 1.00 ft³
Tuning Frequency: 50 Hz
Port Area: 7.06 inch²
Port Inner Diameter: 3.00"
Port Length: 4.67"
Wood Cuts (Qty 2 each):
- Top-Bottom (WxH): 33.46" x 6.44"
- Front-Rear (WxH): 33.46" x 10.79"
- Left-Right (WxH): 5.42" x 10.79"
