Vented Specialist

DS18 PRO-GM6B

Best box: 5.5 L bass reflex tuned to 89.2 Hz · F3 127.4 Hz

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Comparable 6.5" Drivers

Drivers with similar piston area, resonance and Qts — useful alternatives when the DS18 PRO-GM6B does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.

DS18

PRO-GM6

6.5" · Fs 113.0 Hz · Qts 0.988 · Vas 5.6 L

DS18

PRO-NEO6R

6.5" · Fs 99.5 Hz · Qts 0.231 · Vas 5.1 L

DS18

PRO-X6.4BMSL

6.5" · Fs 140.0 Hz · Qts 0.72 · Vas 4.5 L

Dayton Audio

MB620-8

6.5" · Fs 104.0 Hz · Qts 0.59 · Vas 6.8 L

PRV Audio

6CX380-4 SLIM 6.5" Professional 2-Way Full-Range Coaxial Speaker

6.5" · Fs 111.7 Hz · Qts 0.77 · Vas 6.6 L

DB Drive

QPRO6M-8:

6.5" · Fs 97.6 Hz · Qts 0.64 · Vas 7.3 L

Compare them in the same box → Browse all 6.5" drivers → All DS18 drivers →

⚠️ 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.

Recommended Bass Reflex (Vented)

PORT BUILDABLE

Net Box Volume (Vb)	5.5 Liters
Tuning Frequency (Fb)	89.2 Hz
F3 (-3 dB Cutoff)	127.4 Hz
F6 / F10 Extension	106.6 Hz / 82.6 Hz
Port Inner Diameter ESTIMATED	Ø 5.0 cm
Port Physical Length	9.9 cm
First Pipe Resonance	1742.0 Hz
Estimated MOL @ F3	113.6 dB SPL

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Sealed (Acoustic Suspension) — compromise

SUITS INFINITE / OPEN BAFFLE

With Qts 0.724 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.024; for a flat response this driver is better used on an infinite (IB) or open baffle.

Net Box Volume (Vb)	6.9 Liters
System Q (Qtc)	1.024 (above Butterworth: Qtc cannot fall below Qts (0.72))
System Resonance (Fc)	148.5 Hz
F3 (-3 dB Cutoff)	120.6 Hz
F6 / F10 Extension	100.2 Hz / 80.8 Hz
Air Spring Linearity	High (Zero port compression)

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Thiele/Small Parameters

Resonance (Fs)	105.0 Hz
Total Q (Qts)	0.724
Electrical Q (Qes)	0.78
Mechanical Q (Qms)	10.09

Equivalent Volume (Vas)	6.9 Liters
Diaphragm Area (Sd)	132.7 cm²
DC Resistance (Re)	6.4 Ω
Efficiency Bandwidth Product (EBP)	134.6

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-GM6B?

Load Forge's calculated alignment puts DS18 PRO-GM6B in a 5.5 liter vented enclosure tuned to 89.2 Hz, reaching an F3 cutoff of approximately 127.4 Hz.

Can DS18 PRO-GM6B be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 6.9 liters with a Qtc of 1.024 (above Butterworth: Qtc cannot fall below Qts (0.72)), the system exhibits an F3 of 120.6 Hz.

What port dimensions should be used for DS18 PRO-GM6B to avoid port chuffing?

Xmax is not published for DS18 PRO-GM6B, so the port is an empirical estimate: a 5.0 cm diameter with a length of 9.9 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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