Gately Audio AD2108 D4 100-500w 8"
Best box: 3.9 L bass reflex tuned to 58.0 Hz · F3 63.7 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Gately Audio AD2108 D4 100-500w 8" 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 (3.4 L at 44.6 Hz) would need a 156.1 cm port; the recommendation is retuned to 3.9 L at 58.0 Hz so the port can be built.
- Port length (95.6 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) | 3.9 Liters |
| Tuning Frequency (Fb) | 58.0 Hz |
| F3 (-3 dB Cutoff) | 63.7 Hz |
| F6 / F10 Extension | 54.6 Hz / 45.6 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 95.6 cm |
| First Pipe Resonance | 180.0 Hz |
| Estimated MOL @ F3 | 107.1 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.63 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.891; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 4.2 Liters |
| System Q (Qtc) | 0.891 (above Butterworth) |
| System Resonance (Fc) | 74.2 Hz |
| F3 (-3 dB Cutoff) | 65.5 Hz |
| F6 / F10 Extension | 52.8 Hz / 41.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 52.5 Hz |
| Total Q (Qts) | 0.63 |
| Electrical Q (Qes) | 0.721 |
| Mechanical Q (Qms) | 4.97 |
| Equivalent Volume (Vas) | 4.2 Liters |
| Diaphragm Area (Sd) | 208.0 cm² |
| DC Resistance (Re) | 7.24 Ω |
| Efficiency Bandwidth Product (EBP) | 72.8 |
| Linear Excursion (Xmax) | 10.0 mm |
| Thermal Power (Pe) | 300.0 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 Gately Audio AD2108 D4 100-500w 8"?
Load Forge's calculated alignment puts Gately Audio AD2108 D4 100-500w 8" in a 3.9 liter vented enclosure tuned to 58.0 Hz, reaching an F3 cutoff of approximately 63.7 Hz.
Can Gately Audio AD2108 D4 100-500w 8" be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 4.2 liters with a Qtc of 0.891 (above Butterworth), the system exhibits an F3 of 65.5 Hz.
What port dimensions should be used for Gately Audio AD2108 D4 100-500w 8" to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 7.5 cm with a length of 95.6 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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