GAS Audio Power MAX S1-18D1
Best box: 210.1 L bass reflex tuned to 22.0 Hz · F3 21.0 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the GAS Audio Power MAX S1-18D1 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
- The textbook alignment (210.1 L at 19.1 Hz) would need a 115.6 cm port; the recommendation is retuned to 210.1 L at 22.0 Hz so the port can be built.
- Port length (97.3 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
- Large enclosure volume (210.1 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 210.1 Liters |
| Tuning Frequency (Fb) | 22.0 Hz |
| F3 (-3 dB Cutoff) | 21.0 Hz |
| F6 / F10 Extension | 18.5 Hz / 16.3 Hz |
| Port Inner Diameter | Ø 22.1 cm |
| Port Physical Length | 97.3 cm |
| First Pipe Resonance | 177.0 Hz |
| Estimated MOL @ F3 | 118.3 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 140.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 33.9 Hz |
| F3 (-3 dB Cutoff) | 32.7 Hz |
| F6 / F10 Extension | 25.5 Hz / 19.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 24.4 Hz |
| Total Q (Qts) | 0.5 |
| Electrical Q (Qes) | 0.545 |
| Mechanical Q (Qms) | 6.01 |
| Equivalent Volume (Vas) | 140.1 Liters |
| Diaphragm Area (Sd) | 1194.0 cm² |
| DC Resistance (Re) | 1.8 Ω |
| Efficiency Bandwidth Product (EBP) | 44.7 |
| Linear Excursion (Xmax) | 40.0 mm |
| Thermal Power (Pe) | 1800.0 W |
| Nominal Diameter | 18.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for GAS Audio Power MAX S1-18D1?
Load Forge's calculated alignment puts GAS Audio Power MAX S1-18D1 in a 210.1 liter vented enclosure tuned to 22.0 Hz, reaching an F3 cutoff of approximately 21.0 Hz.
Can GAS Audio Power MAX S1-18D1 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 140.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 32.7 Hz.
What port dimensions should be used for GAS Audio Power MAX S1-18D1 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 22.1 cm with a length of 97.3 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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.
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