GRS 8SW-4HE 8" High Excursion Subwoofer 4 Ohm
Best box: 48.1 L bass reflex tuned to 21.5 Hz · F3 19.9 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the GRS 8SW-4HE 8" High Excursion Subwoofer 4 Ohm does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 48.1 Liters |
| Tuning Frequency (Fb) | 21.5 Hz |
| F3 (-3 dB Cutoff) | 19.9 Hz |
| F6 / F10 Extension | 18.0 Hz / 16.1 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 22.9 cm |
| First Pipe Resonance | 751.0 Hz |
| Estimated MOL @ F3 | 100.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 21.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 38.8 Hz |
| F3 (-3 dB Cutoff) | 39.5 Hz |
| F6 / F10 Extension | 29.8 Hz / 22.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 24.9 Hz |
| Total Q (Qts) | 0.45 |
| Electrical Q (Qes) | 0.501 |
| Mechanical Q (Qms) | 4.42 |
| Equivalent Volume (Vas) | 31.7 Liters |
| Diaphragm Area (Sd) | 227.0 cm² |
| DC Resistance (Re) | 3.8 Ω |
| Efficiency Bandwidth Product (EBP) | 49.7 |
| Linear Excursion (Xmax) | 10.8 mm |
| Thermal Power (Pe) | 150.0 W |
| Nominal Diameter | 8.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for GRS 8SW-4HE 8" High Excursion Subwoofer 4 Ohm?
Load Forge's calculated alignment puts GRS 8SW-4HE 8" High Excursion Subwoofer 4 Ohm in a 48.1 liter vented enclosure tuned to 21.5 Hz, reaching an F3 cutoff of approximately 19.9 Hz.
Can GRS 8SW-4HE 8" High Excursion Subwoofer 4 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 21.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 39.5 Hz.
What port dimensions should be used for GRS 8SW-4HE 8" High Excursion Subwoofer 4 Ohm to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 22.9 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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