GRS 12SW-4HE 12" Paper Cone Rubber Surround High Excursion Subwoofer 4 Ohm
Best box: 107.0 L bass reflex tuned to 20.7 Hz · F3 19.0 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the GRS 12SW-4HE 12" Paper Cone Rubber Surround 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.
⚠️ Engineering Notice for Builders
- The textbook alignment (107.0 L at 19.7 Hz) would need a 49.5 cm port; the recommendation is retuned to 107.0 L at 20.7 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 107.0 Liters |
| Tuning Frequency (Fb) | 20.7 Hz |
| F3 (-3 dB Cutoff) | 19.0 Hz |
| F6 / F10 Extension | 17.2 Hz / 15.3 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 44.2 cm |
| First Pipe Resonance | 389.0 Hz |
| Estimated MOL @ F3 | 105.2 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 47.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 35.7 Hz |
| F3 (-3 dB Cutoff) | 36.4 Hz |
| F6 / F10 Extension | 27.4 Hz / 20.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 22.0 Hz |
| Total Q (Qts) | 0.43 |
| Electrical Q (Qes) | 0.481 |
| Mechanical Q (Qms) | 4.08 |
| Equivalent Volume (Vas) | 80.4 Liters |
| Diaphragm Area (Sd) | 507.3 cm² |
| DC Resistance (Re) | 3.9 Ω |
| Efficiency Bandwidth Product (EBP) | 45.8 |
| Linear Excursion (Xmax) | 12.5 mm |
| Thermal Power (Pe) | 250.0 W |
| Nominal Diameter | 12.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for GRS 12SW-4HE 12" Paper Cone Rubber Surround High Excursion Subwoofer 4 Ohm?
Load Forge's calculated alignment puts GRS 12SW-4HE 12" Paper Cone Rubber Surround High Excursion Subwoofer 4 Ohm in a 107.0 liter vented enclosure tuned to 20.7 Hz, reaching an F3 cutoff of approximately 19.0 Hz.
Can GRS 12SW-4HE 12" Paper Cone Rubber Surround High Excursion Subwoofer 4 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 47.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 36.4 Hz.
What port dimensions should be used for GRS 12SW-4HE 12" Paper Cone Rubber Surround High Excursion Subwoofer 4 Ohm to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 44.2 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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