AudioTechnology 6_a_77_20_06_sd_flexunits_woofer
Best box: 25.1 L bass reflex tuned to 39.8 Hz · F3 42.0 Hz
Open and tweak this box live ↗
Will it fit your requirements?
Check the AudioTechnology 6_a_77_20_06_sd_flexunits_woofer against your space and targets — instant, no sign-up.
Free, no sign-up to simulate · a free account saves your design
Comparable 7.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the AudioTechnology 6_a_77_20_06_sd_flexunits_woofer does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 25.1 Liters |
| Tuning Frequency (Fb) | 39.8 Hz |
| F3 (-3 dB Cutoff) | 42.0 Hz |
| F6 / F10 Extension | 36.4 Hz / 31.5 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 22.5 cm |
| First Pipe Resonance | 764.0 Hz |
| Estimated MOL @ F3 | 107.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 11.3 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 73.0 Hz |
| F3 (-3 dB Cutoff) | 74.9 Hz |
| F6 / F10 Extension | 56.7 Hz / 42.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 34.0 Hz |
| Total Q (Qts) | 0.32 |
| Electrical Q (Qes) | 0.381 |
| Mechanical Q (Qms) | 2.0 |
| Equivalent Volume (Vas) | 44.0 Liters |
| Diaphragm Area (Sd) | 172.0 cm² |
| DC Resistance (Re) | 5.5 Ω |
| Efficiency Bandwidth Product (EBP) | 89.2 |
| Linear Excursion (Xmax) | 8.0 mm |
| Thermal Power (Pe) | 180.0 W |
| Nominal Diameter | 7.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for AudioTechnology 6_a_77_20_06_sd_flexunits_woofer?
Load Forge's calculated alignment puts AudioTechnology 6_a_77_20_06_sd_flexunits_woofer in a 25.1 liter vented enclosure tuned to 39.8 Hz, reaching an F3 cutoff of approximately 42.0 Hz.
Can AudioTechnology 6_a_77_20_06_sd_flexunits_woofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 11.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 74.9 Hz.
What port dimensions should be used for AudioTechnology 6_a_77_20_06_sd_flexunits_woofer to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 22.5 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.
Not sure if 6_a_77_20_06_sd_flexunits_woofer fits your physical space?
Don't force a driver into the wrong box. Use Bass Match to calculate which of 8,000+ catalog drivers delivers the highest SPL, lowest F3, and cleanest port air velocity for your exact trunk or room dimensions.
Run Bass Match for Your Space