Dayton Audio SIG120-4 Mid-range Woofer
Best box: 0.059 L sealed · Fc 122.6 Hz · F3 123.5 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Dayton Audio SIG120-4 Mid-range Woofer 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
- The textbook alignment (1.5 L at 67.0 Hz) would need a 156.8 cm port; the recommendation is retuned to 1.5 L at 103.9 Hz so the port can be built.
- Port length (62.4 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Textbook Bass Reflex — not recommended (8.1 dB bass hump)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 103.9 Hz |
| F3 (-3 dB Cutoff) | 98.2 Hz |
| F6 / F10 Extension | 94.2 Hz / 88.6 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 62.4 cm |
| First Pipe Resonance | 276.0 Hz |
| Estimated MOL @ F3 | 95.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.059 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 122.6 Hz |
| F3 (-3 dB Cutoff) | 123.5 Hz |
| F6 / F10 Extension | 93.5 Hz / 70.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 74.6 Hz |
| Total Q (Qts) | 0.43 |
| Electrical Q (Qes) | 0.472 |
| Mechanical Q (Qms) | 4.84 |
| Equivalent Volume (Vas) | 0.1 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 3.7 Ω |
| Efficiency Bandwidth Product (EBP) | 158.1 |
| Linear Excursion (Xmax) | 4.0 mm |
| Thermal Power (Pe) | 40.0 W |
| Nominal Diameter | 8.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Dayton Audio SIG120-4 Mid-range Woofer?
A simple ported box is not recommended for Dayton Audio SIG120-4 Mid-range Woofer: the textbook alignment (1.5 liters tuned to 103.9 Hz) needs a 62.4 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 Dayton Audio SIG120-4 Mid-range Woofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.059 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 123.5 Hz.
What port dimensions should be used for Dayton Audio SIG120-4 Mid-range Woofer to avoid port chuffing?
A straight 6.8 cm port would need 62.4 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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