GRS S115V-LF-8 Replacement 15" Woofer for Yamaha Club Series S115V Speakers
Best box: 251.7 L bass reflex tuned to 36.3 Hz · F3 34.2 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the GRS S115V-LF-8 Replacement 15" Woofer for Yamaha Club Series S115V Speakers 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 (251.7 L) requires extensive internal matrix bracing to prevent panel resonance.
- Limited linear excursion (Xmax: 3.25 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) | 251.7 Liters |
| Tuning Frequency (Fb) | 36.3 Hz |
| F3 (-3 dB Cutoff) | 34.2 Hz |
| F6 / F10 Extension | 30.8 Hz / 27.3 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 2.2 cm |
| First Pipe Resonance | 7987.0 Hz |
| Estimated MOL @ F3 | 115.9 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 109.5 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 62.1 Hz |
| F3 (-3 dB Cutoff) | 63.4 Hz |
| F6 / F10 Extension | 47.6 Hz / 35.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 37.4 Hz |
| Total Q (Qts) | 0.394 |
| Electrical Q (Qes) | 0.405 |
| Mechanical Q (Qms) | 14.02 |
| Equivalent Volume (Vas) | 243.1 Liters |
| Diaphragm Area (Sd) | 829.6 cm² |
| DC Resistance (Re) | 6.15 Ω |
| Efficiency Bandwidth Product (EBP) | 92.1 |
| Linear Excursion (Xmax) | 3.2 mm |
| Thermal Power (Pe) | 350.0 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 GRS S115V-LF-8 Replacement 15" Woofer for Yamaha Club Series S115V Speakers?
Load Forge's calculated alignment puts GRS S115V-LF-8 Replacement 15" Woofer for Yamaha Club Series S115V Speakers in a 251.7 liter vented enclosure tuned to 36.3 Hz, reaching an F3 cutoff of approximately 34.2 Hz.
Can GRS S115V-LF-8 Replacement 15" Woofer for Yamaha Club Series S115V Speakers be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 109.5 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 63.4 Hz.
What port dimensions should be used for GRS S115V-LF-8 Replacement 15" Woofer for Yamaha Club Series S115V Speakers to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 2.2 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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