Reckhorn SW-300i
Best box: 8.1 L bass reflex tuned to 36.5 Hz · F3 39.0 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Reckhorn SW-300i 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 (8.1 L at 34.8 Hz) would need a 106.1 cm port; the recommendation is retuned to 8.1 L at 36.5 Hz so the port can be built.
- 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.
- Port length (96.0 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) | 8.1 Liters |
| Tuning Frequency (Fb) | 36.5 Hz |
| F3 (-3 dB Cutoff) | 39.0 Hz |
| F6 / F10 Extension | 33.7 Hz / 29.1 Hz |
| Port Inner Diameter ESTIMATED | Ø 6.8 cm |
| Port Physical Length | 96.0 cm |
| First Pipe Resonance | 179.0 Hz |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 3.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 65.4 Hz |
| F3 (-3 dB Cutoff) | 68.8 Hz |
| F6 / F10 Extension | 52.0 Hz / 39.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 28.0 Hz |
| Total Q (Qts) | 0.3 |
| Electrical Q (Qes) | 0.317 |
| Mechanical Q (Qms) | 5.69 |
| Equivalent Volume (Vas) | 17.0 Liters |
| Diaphragm Area (Sd) | 132.0 cm² |
| DC Resistance (Re) | 3.6 Ω |
| Efficiency Bandwidth Product (EBP) | 88.4 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 6.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Reckhorn SW-300i?
Load Forge's calculated alignment puts Reckhorn SW-300i in a 8.1 liter vented enclosure tuned to 36.5 Hz, reaching an F3 cutoff of approximately 39.0 Hz.
Can Reckhorn SW-300i be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 68.8 Hz.
What port dimensions should be used for Reckhorn SW-300i to avoid port chuffing?
Xmax is not published for Reckhorn SW-300i, so the port is an empirical estimate: a 6.8 cm diameter with a length of 96.0 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
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.
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