GRS 12SW-4 Subwoofer
Best box: 69.2 L sealed · Fc 45.3 Hz · F3 36.9 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the GRS 12SW-4 Subwoofer does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Textbook Bass Reflex — not recommended (4.6 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 55.4 Liters |
| Tuning Frequency (Fb) | 27.2 Hz |
| F3 (-3 dB Cutoff) | 41.2 Hz |
| F6 / F10 Extension | 35.4 Hz / 28.4 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 10.8 cm |
| First Pipe Resonance | 1595.0 Hz |
| Estimated MOL @ F3 | 106.3 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.98 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.386; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 69.2 Liters |
| System Q (Qtc) | 1.386 (above Butterworth: Qtc cannot fall below Qts (0.98)) |
| System Resonance (Fc) | 45.3 Hz |
| F3 (-3 dB Cutoff) | 36.9 Hz |
| F6 / F10 Extension | 31.6 Hz / 26.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 32.0 Hz |
| Total Q (Qts) | 0.98 |
| Electrical Q (Qes) | 1.252 |
| Mechanical Q (Qms) | 4.51 |
| Equivalent Volume (Vas) | 69.2 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 3.7 Ω |
| Efficiency Bandwidth Product (EBP) | 25.6 |
| Linear Excursion (Xmax) | 8.5 mm |
| Thermal Power (Pe) | 120.0 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 12SW-4 Subwoofer?
A simple ported box is not recommended for GRS 12SW-4 Subwoofer: the textbook alignment (55.4 liters tuned to 27.2 Hz) needs a 10.8 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can GRS 12SW-4 Subwoofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 69.2 liters with a Qtc of 1.386 (above Butterworth: Qtc cannot fall below Qts (0.98)), the system exhibits an F3 of 36.9 Hz.
What port dimensions should be used for GRS 12SW-4 Subwoofer to avoid port chuffing?
A straight 5.0 cm port would need 10.8 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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