DS18 PRO-GM6SE
Best box: 0.48 L sealed · Fc 646.3 Hz · F3 542.9 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the DS18 PRO-GM6SE 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
- 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.
Textbook Bass Reflex — not recommended (15.0 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 388.4 Hz |
| F3 (-3 dB Cutoff) | 472.1 Hz |
| F6 / F10 Extension | 413.2 Hz / 295.2 Hz |
| Port Inner Diameter ESTIMATED | Ø 10.0 cm |
| Port Physical Length | 3.3 cm |
| First Pipe Resonance | 5286.0 Hz |
| Estimated MOL @ F3 | 124.4 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 2.454 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 3.47; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.48 Liters |
| System Q (Qtc) | 3.47 (above Butterworth: Qtc cannot fall below Qts (2.45)) |
| System Resonance (Fc) | 646.3 Hz |
| F3 (-3 dB Cutoff) | 542.9 Hz |
| F6 / F10 Extension | 499.1 Hz / 442.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 457.0 Hz |
| Total Q (Qts) | 2.454 |
| Electrical Q (Qes) | 3.592 |
| Mechanical Q (Qms) | 7.74 |
| Equivalent Volume (Vas) | 0.5 Liters |
| Diaphragm Area (Sd) | 132.7 cm² |
| DC Resistance (Re) | 6.2 Ω |
| Efficiency Bandwidth Product (EBP) | 127.2 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 140.0 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 DS18 PRO-GM6SE?
A simple ported box is not recommended for DS18 PRO-GM6SE: the textbook alignment (1.5 liters tuned to 388.4 Hz) needs a 3.3 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 DS18 PRO-GM6SE be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.48 liters with a Qtc of 3.47 (above Butterworth: Qtc cannot fall below Qts (2.45)), the system exhibits an F3 of 542.9 Hz.
What port dimensions should be used for DS18 PRO-GM6SE to avoid port chuffing?
A straight 10.0 cm port would need 3.3 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
Shareable Acoustic Card for Forums & Social Media
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