Jensen C 12/70 EL
Best box: 25.6 L bass reflex tuned to 80.8 Hz · F3 107.6 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Jensen C 12/70 EL 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
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 25.6 Liters |
| Tuning Frequency (Fb) | 80.8 Hz |
| F3 (-3 dB Cutoff) | 107.6 Hz |
| F6 / F10 Extension | 88.9 Hz / 69.1 Hz |
| Port Inner Diameter ESTIMATED | Ø 10.0 cm |
| Port Physical Length | 6.9 cm |
| First Pipe Resonance | 2480.0 Hz |
| Estimated MOL @ F3 | 115.3 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.67 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.948; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 32.0 Liters |
| System Q (Qtc) | 0.948 (above Butterworth) |
| System Resonance (Fc) | 134.4 Hz |
| F3 (-3 dB Cutoff) | 107.3 Hz |
| F6 / F10 Extension | 87.4 Hz / 69.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 95.0 Hz |
| Total Q (Qts) | 0.67 |
| Electrical Q (Qes) | 0.702 |
| Mechanical Q (Qms) | 14.77 |
| Equivalent Volume (Vas) | 32.0 Liters |
| Diaphragm Area (Sd) | 490.9 cm² |
| DC Resistance (Re) | 6.33 Ω |
| Efficiency Bandwidth Product (EBP) | 135.4 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 70.0 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 Jensen C 12/70 EL?
Load Forge's calculated alignment puts Jensen C 12/70 EL in a 25.6 liter vented enclosure tuned to 80.8 Hz, reaching an F3 cutoff of approximately 107.6 Hz.
Can Jensen C 12/70 EL be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 32.0 liters with a Qtc of 0.948 (above Butterworth), the system exhibits an F3 of 107.3 Hz.
What port dimensions should be used for Jensen C 12/70 EL to avoid port chuffing?
Xmax is not published for Jensen C 12/70 EL, so the port is an empirical estimate: a 10.0 cm diameter with a length of 6.9 cm (area at least 12 in² per ft³ of net volume). Check the air velocity at your power level in Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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