Bliesma M74D-6
Best box: 2.0 L bass reflex tuned to 126.0 Hz · F3 150.9 Hz
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Comparable 3.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Bliesma M74D-6 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
- Limited linear excursion (Xmax: 2.8 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) | 2.0 Liters |
| Tuning Frequency (Fb) | 126.0 Hz |
| F3 (-3 dB Cutoff) | 150.9 Hz |
| F6 / F10 Extension | 112.0 Hz / 95.8 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 15.0 cm |
| First Pipe Resonance | 1150.0 Hz |
| Estimated MOL @ F3 | 109.5 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 209.9 Hz |
| F3 (-3 dB Cutoff) | 212.2 Hz |
| F6 / F10 Extension | 160.6 Hz / 121.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 180.0 Hz |
| Total Q (Qts) | 0.58 |
| Electrical Q (Qes) | 0.618 |
| Mechanical Q (Qms) | 9.5 |
| Equivalent Volume (Vas) | 1.3 Liters |
| Diaphragm Area (Sd) | 43.0 cm² |
| DC Resistance (Re) | 5.7 Ω |
| Efficiency Bandwidth Product (EBP) | 291.4 |
| Linear Excursion (Xmax) | 2.8 mm |
| Thermal Power (Pe) | 90.0 W |
| Nominal Diameter | 3.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Bliesma M74D-6?
Load Forge's calculated alignment puts Bliesma M74D-6 in a 2.0 liter vented enclosure tuned to 126.0 Hz, reaching an F3 cutoff of approximately 150.9 Hz.
Can Bliesma M74D-6 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 212.2 Hz.
What port dimensions should be used for Bliesma M74D-6 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 15.0 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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