GRS 8PF-8 8" Paper Cone Foam Surround Woofer
Best box: 21.5 L bass reflex tuned to 43.4 Hz · F3 66.1 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the GRS 8PF-8 8" Paper Cone Foam Surround Woofer 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
- Limited linear excursion (Xmax: 3.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 21.5 Liters |
| Tuning Frequency (Fb) | 43.4 Hz |
| F3 (-3 dB Cutoff) | 66.1 Hz |
| F6 / F10 Extension | 56.8 Hz / 45.4 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 11.0 cm |
| First Pipe Resonance | 1570.0 Hz |
| Estimated MOL @ F3 | 105.2 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.93 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.315; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 26.9 Liters |
| System Q (Qtc) | 1.315 (above Butterworth: Qtc cannot fall below Qts (0.93)) |
| System Resonance (Fc) | 72.1 Hz |
| F3 (-3 dB Cutoff) | 59.5 Hz |
| F6 / F10 Extension | 50.8 Hz / 41.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 51.0 Hz |
| Total Q (Qts) | 0.93 |
| Electrical Q (Qes) | 1.167 |
| Mechanical Q (Qms) | 4.58 |
| Equivalent Volume (Vas) | 26.9 Liters |
| Diaphragm Area (Sd) | 215.4 cm² |
| DC Resistance (Re) | 7.59 Ω |
| Efficiency Bandwidth Product (EBP) | 43.7 |
| Linear Excursion (Xmax) | 3.0 mm |
| Thermal Power (Pe) | 100.0 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 8PF-8 8" Paper Cone Foam Surround Woofer?
Load Forge's calculated alignment puts GRS 8PF-8 8" Paper Cone Foam Surround Woofer in a 21.5 liter vented enclosure tuned to 43.4 Hz, reaching an F3 cutoff of approximately 66.1 Hz.
Can GRS 8PF-8 8" Paper Cone Foam Surround Woofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 26.9 liters with a Qtc of 1.315 (above Butterworth: Qtc cannot fall below Qts (0.93)), the system exhibits an F3 of 59.5 Hz.
What port dimensions should be used for GRS 8PF-8 8" Paper Cone Foam Surround Woofer to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 11.0 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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