MTX Audio 3512-04S
Best box: 46.4 L bass reflex tuned to 25.2 Hz · F3 36.4 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the MTX Audio 3512-04S 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 (72.7 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 46.4 Liters |
| Tuning Frequency (Fb) | 25.2 Hz |
| F3 (-3 dB Cutoff) | 36.4 Hz |
| F6 / F10 Extension | 30.0 Hz / 22.9 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 72.7 cm |
| First Pipe Resonance | 236.0 Hz |
| Estimated MOL @ F3 | 108.9 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.69 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.976; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 58.0 Liters |
| System Q (Qtc) | 0.976 (above Butterworth) |
| System Resonance (Fc) | 41.9 Hz |
| F3 (-3 dB Cutoff) | 36.0 Hz |
| F6 / F10 Extension | 29.5 Hz / 23.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 29.6 Hz |
| Total Q (Qts) | 0.69 |
| Electrical Q (Qes) | 0.87 |
| Mechanical Q (Qms) | 3.33 |
| Equivalent Volume (Vas) | 58.0 Liters |
| Diaphragm Area (Sd) | 573.6 cm² |
| DC Resistance (Re) | 3.13 Ω |
| Efficiency Bandwidth Product (EBP) | 34.0 |
| Linear Excursion (Xmax) | 10.2 mm |
| Thermal Power (Pe) | 300.0 W |
| Nominal Diameter | 12.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for MTX Audio 3512-04S?
Load Forge's calculated alignment puts MTX Audio 3512-04S in a 46.4 liter vented enclosure tuned to 25.2 Hz, reaching an F3 cutoff of approximately 36.4 Hz.
Can MTX Audio 3512-04S be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 58.0 liters with a Qtc of 0.976 (above Butterworth), the system exhibits an F3 of 36.0 Hz.
What port dimensions should be used for MTX Audio 3512-04S to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 72.7 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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