Goldwood GW-215/40/8 15" OEM Woofer 40 oz.
Best box: 261.1 L sealed · Fc 43.2 Hz · F3 34.5 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Goldwood GW-215/40/8 15" OEM Woofer 40 oz. 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
- Large enclosure volume (208.9 L) requires extensive internal matrix bracing to prevent panel resonance.
- Limited linear excursion (Xmax: 3.5 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (5.6 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 208.9 Liters |
| Tuning Frequency (Fb) | 26.0 Hz |
| F3 (-3 dB Cutoff) | 39.1 Hz |
| F6 / F10 Extension | 34.1 Hz / 27.6 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 2.8 cm |
| First Pipe Resonance | 6042.0 Hz |
| Estimated MOL @ F3 | 109.2 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.09 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.541; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 261.1 Liters |
| System Q (Qtc) | 1.541 (above Butterworth: Qtc cannot fall below Qts (1.09)) |
| System Resonance (Fc) | 43.2 Hz |
| F3 (-3 dB Cutoff) | 34.5 Hz |
| F6 / F10 Extension | 29.9 Hz / 24.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.5 Hz |
| Total Q (Qts) | 1.09 |
| Electrical Q (Qes) | 1.383 |
| Mechanical Q (Qms) | 5.15 |
| Equivalent Volume (Vas) | 261.1 Liters |
| Diaphragm Area (Sd) | 823.4 cm² |
| DC Resistance (Re) | 7.15 Ω |
| Efficiency Bandwidth Product (EBP) | 22.1 |
| Linear Excursion (Xmax) | 3.5 mm |
| Thermal Power (Pe) | 150.0 W |
| Nominal Diameter | 15.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Goldwood GW-215/40/8 15" OEM Woofer 40 oz.?
A simple ported box is not recommended for Goldwood GW-215/40/8 15" OEM Woofer 40 oz.: the textbook alignment (208.9 liters tuned to 26.0 Hz) needs a 2.8 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 Goldwood GW-215/40/8 15" OEM Woofer 40 oz. be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 261.1 liters with a Qtc of 1.541 (above Butterworth: Qtc cannot fall below Qts (1.09)), the system exhibits an F3 of 34.5 Hz.
What port dimensions should be used for Goldwood GW-215/40/8 15" OEM Woofer 40 oz. to avoid port chuffing?
A straight 6.8 cm port would need 2.8 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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