MTX Audio RT12-44
Best box: 54.4 L bass reflex tuned to 23.8 Hz · F3 35.0 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the MTX Audio RT12-44 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 (69.3 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) | 54.4 Liters |
| Tuning Frequency (Fb) | 23.8 Hz |
| F3 (-3 dB Cutoff) | 35.0 Hz |
| F6 / F10 Extension | 28.8 Hz / 21.9 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 69.3 cm |
| First Pipe Resonance | 248.0 Hz |
| Estimated MOL @ F3 | 108.8 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.7 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.99; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 68.0 Liters |
| System Q (Qtc) | 0.99 (above Butterworth) |
| System Resonance (Fc) | 39.6 Hz |
| F3 (-3 dB Cutoff) | 34.5 Hz |
| F6 / F10 Extension | 28.3 Hz / 22.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 28.0 Hz |
| Total Q (Qts) | 0.7 |
| Electrical Q (Qes) | 0.783 |
| Mechanical Q (Qms) | 6.6 |
| Equivalent Volume (Vas) | 68.0 Liters |
| Diaphragm Area (Sd) | 510.0 cm² |
| DC Resistance (Re) | 1.6 Ω |
| Efficiency Bandwidth Product (EBP) | 35.8 |
| Linear Excursion (Xmax) | 16.0 mm |
| Thermal Power (Pe) | 250.0 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 RT12-44?
Load Forge's calculated alignment puts MTX Audio RT12-44 in a 54.4 liter vented enclosure tuned to 23.8 Hz, reaching an F3 cutoff of approximately 35.0 Hz.
Can MTX Audio RT12-44 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 68.0 liters with a Qtc of 0.99 (above Butterworth), the system exhibits an F3 of 34.5 Hz.
What port dimensions should be used for MTX Audio RT12-44 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 69.3 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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