Gladen RS-X 6.5
Best box: 3.1 L bass reflex tuned to 63.0 Hz · F3 70.7 Hz
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Comparable 7.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Gladen RS-X 6.5 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 (3.1 L at 46.7 Hz) would need a 83.5 cm port; the recommendation is retuned to 3.1 L at 63.0 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.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 3.1 Liters |
| Tuning Frequency (Fb) | 63.0 Hz |
| F3 (-3 dB Cutoff) | 70.7 Hz |
| F6 / F10 Extension | 60.7 Hz / 50.6 Hz |
| Port Inner Diameter ESTIMATED | Ø 5.0 cm |
| Port Physical Length | 44.3 cm |
| First Pipe Resonance | 389.0 Hz |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.62 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.877; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 3.9 Liters |
| System Q (Qtc) | 0.877 (above Butterworth) |
| System Resonance (Fc) | 77.6 Hz |
| F3 (-3 dB Cutoff) | 68.6 Hz |
| F6 / F10 Extension | 55.1 Hz / 43.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 54.9 Hz |
| Total Q (Qts) | 0.62 |
| Electrical Q (Qes) | 0.697 |
| Mechanical Q (Qms) | 5.59 |
| Equivalent Volume (Vas) | 3.9 Liters |
| Diaphragm Area (Sd) | 143.0 cm² |
| DC Resistance (Re) | 3.3 Ω |
| Efficiency Bandwidth Product (EBP) | 78.7 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 7.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Gladen RS-X 6.5?
Load Forge's calculated alignment puts Gladen RS-X 6.5 in a 3.1 liter vented enclosure tuned to 63.0 Hz, reaching an F3 cutoff of approximately 70.7 Hz.
Can Gladen RS-X 6.5 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.9 liters with a Qtc of 0.877 (above Butterworth), the system exhibits an F3 of 68.6 Hz.
What port dimensions should be used for Gladen RS-X 6.5 to avoid port chuffing?
Xmax is not published for Gladen RS-X 6.5, so the port is an empirical estimate: a 5.0 cm diameter with a length of 44.3 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
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