Ground Zero GZPW 15XMAX-II
Best box: 14.2 L sealed · Fc 50.8 Hz · F3 52.2 Hz
Open and tweak this box live ↗
Will it fit your requirements?
Check the Ground Zero GZPW 15XMAX-II against your space and targets — instant, no sign-up.
Estimated retail 2899.00 EUR · Check price & availability ↗
Free, no sign-up to simulate · a free account saves your design
Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Ground Zero GZPW 15XMAX-II 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
- Straight vent would be 805.5 cm long: not physically buildable as a simple tube. Use a passive radiator, a folded slot port or model a 3D folded duct in Load Forge Studio.
Textbook Bass Reflex — not recommended
PORT NOT BUILDABLE| Net Box Volume (Vb) | 32.5 Liters |
| Tuning Frequency (Fb) | 27.8 Hz |
| F3 (-3 dB Cutoff) | 26.7 Hz |
| F6 / F10 Extension | 23.7 Hz / 21.0 Hz |
| Port Inner Diameter | Ø 29.7 cm |
| Port Physical Length | 805.5 cm |
| First Pipe Resonance | 21.0 Hz |
| Estimated MOL @ F3 | 118.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 14.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 50.8 Hz |
| F3 (-3 dB Cutoff) | 52.2 Hz |
| F6 / F10 Extension | 39.3 Hz / 29.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.0 Hz |
| Total Q (Qts) | 0.415 |
| Electrical Q (Qes) | 0.447 |
| Mechanical Q (Qms) | 5.8 |
| Equivalent Volume (Vas) | 27.0 Liters |
| Diaphragm Area (Sd) | 855.0 cm² |
| DC Resistance (Re) | 1.9 Ω |
| Efficiency Bandwidth Product (EBP) | 67.1 |
| Linear Excursion (Xmax) | 80.0 mm |
| Thermal Power (Pe) | 6000.0 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 Ground Zero GZPW 15XMAX-II?
A simple ported box is not recommended for Ground Zero GZPW 15XMAX-II: the textbook alignment (32.5 liters tuned to 27.8 Hz) needs a 805.5 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 Ground Zero GZPW 15XMAX-II be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 14.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 52.2 Hz.
What port dimensions should be used for Ground Zero GZPW 15XMAX-II to avoid port chuffing?
A straight 29.7 cm port would need 805.5 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
Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.
Not sure if GZPW 15XMAX-II fits your physical space?
Don't force a driver into the wrong box. Use Bass Match to calculate which of 8,000+ catalog drivers delivers the highest SPL, lowest F3, and cleanest port air velocity for your exact trunk or room dimensions.
Run Bass Match for Your Space