Jensen P 12 Q
Best box: 39.5 L sealed · Fc 128.0 Hz · F3 101.8 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Jensen P 12 Q 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.
Textbook Bass Reflex — not recommended (3.1 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 31.6 Liters |
| Tuning Frequency (Fb) | 76.9 Hz |
| F3 (-3 dB Cutoff) | 120.5 Hz |
| F6 / F10 Extension | 109.8 Hz / 95.2 Hz |
| Port Inner Diameter ESTIMATED | Ø 12.5 cm |
| Port Physical Length | 10.7 cm |
| First Pipe Resonance | 1600.0 Hz |
| Estimated MOL @ F3 | 115.2 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 2.03 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 2.871; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 39.5 Liters |
| System Q (Qtc) | 2.871 (above Butterworth: Qtc cannot fall below Qts (2.03)) |
| System Resonance (Fc) | 128.0 Hz |
| F3 (-3 dB Cutoff) | 101.8 Hz |
| F6 / F10 Extension | 92.6 Hz / 81.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 90.5 Hz |
| Total Q (Qts) | 2.03 |
| Electrical Q (Qes) | 2.462 |
| Mechanical Q (Qms) | 11.57 |
| Equivalent Volume (Vas) | 39.5 Liters |
| Diaphragm Area (Sd) | 490.9 cm² |
| DC Resistance (Re) | 5.6 Ω |
| Efficiency Bandwidth Product (EBP) | 36.8 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 40.0 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 P 12 Q?
A simple ported box is not recommended for Jensen P 12 Q: the textbook alignment (31.6 liters tuned to 76.9 Hz) needs a 10.7 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can Jensen P 12 Q be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 39.5 liters with a Qtc of 2.871 (above Butterworth: Qtc cannot fall below Qts (2.03)), the system exhibits an F3 of 101.8 Hz.
What port dimensions should be used for Jensen P 12 Q to avoid port chuffing?
A straight 12.5 cm port would need 10.7 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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