GRS 6PF-8 Bass-midwoofer
Best box: 0.2 L sealed · Fc 116.0 Hz · F3 97.5 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the GRS 6PF-8 Bass-midwoofer 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
- Port length (77.2 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
- Limited linear excursion (Xmax: 3.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (5.5 dB bass hump)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 69.7 Hz |
| F3 (-3 dB Cutoff) | 63.0 Hz |
| F6 / F10 Extension | 59.5 Hz / 55.5 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 77.2 cm |
| First Pipe Resonance | 223.0 Hz |
| Estimated MOL @ F3 | 97.0 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.95 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.344; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.2 Liters |
| System Q (Qtc) | 1.344 (above Butterworth: Qtc cannot fall below Qts (0.95)) |
| System Resonance (Fc) | 116.0 Hz |
| F3 (-3 dB Cutoff) | 97.5 Hz |
| F6 / F10 Extension | 83.3 Hz / 68.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 82.0 Hz |
| Total Q (Qts) | 0.95 |
| Electrical Q (Qes) | 1.282 |
| Mechanical Q (Qms) | 3.67 |
| Equivalent Volume (Vas) | 0.2 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 7.59 Ω |
| Efficiency Bandwidth Product (EBP) | 64.0 |
| Linear Excursion (Xmax) | 3.0 mm |
| Thermal Power (Pe) | 90.0 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 6PF-8 Bass-midwoofer?
A simple ported box is not recommended for GRS 6PF-8 Bass-midwoofer: the textbook alignment (1.5 liters tuned to 69.7 Hz) needs a 77.2 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 6PF-8 Bass-midwoofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.2 liters with a Qtc of 1.344 (above Butterworth: Qtc cannot fall below Qts (0.95)), the system exhibits an F3 of 97.5 Hz.
What port dimensions should be used for GRS 6PF-8 Bass-midwoofer to avoid port chuffing?
A straight 5.0 cm port would need 77.2 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
Shareable Acoustic Card for Forums & Social Media
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