GRS 46AS-4
Best box: 6.8 L bass reflex tuned to 71.4 Hz · F3 132.8 Hz
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Comparable 5.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the GRS 46AS-4 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 (1.7 L at 119.0 Hz) would need a 20.9 cm port; the recommendation is retuned to 6.8 L at 71.4 Hz so the port can be built.
- Limited linear excursion (Xmax: 1.5 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 6.8 Liters |
| Tuning Frequency (Fb) | 71.4 Hz |
| F3 (-3 dB Cutoff) | 132.8 Hz |
| F6 / F10 Extension | 116.5 Hz / 59.4 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 13.4 cm |
| First Pipe Resonance | 1283.0 Hz |
| Estimated MOL @ F3 | 100.9 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.97 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 2.786; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 2.1 Liters |
| System Q (Qtc) | 2.786 (above Butterworth: Qtc cannot fall below Qts (1.97)) |
| System Resonance (Fc) | 198.0 Hz |
| F3 (-3 dB Cutoff) | 166.2 Hz |
| F6 / F10 Extension | 150.9 Hz / 132.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 140.0 Hz |
| Total Q (Qts) | 1.97 |
| Electrical Q (Qes) | 2.894 |
| Mechanical Q (Qms) | 6.17 |
| Equivalent Volume (Vas) | 2.1 Liters |
| Diaphragm Area (Sd) | 81.0 cm² |
| DC Resistance (Re) | 3.7 Ω |
| Efficiency Bandwidth Product (EBP) | 48.4 |
| Linear Excursion (Xmax) | 1.5 mm |
| Thermal Power (Pe) | 25.0 W |
| Nominal Diameter | 5.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for GRS 46AS-4?
Load Forge's calculated alignment puts GRS 46AS-4 in a 6.8 liter vented enclosure tuned to 71.4 Hz, reaching an F3 cutoff of approximately 132.8 Hz.
Can GRS 46AS-4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.1 liters with a Qtc of 2.786 (above Butterworth: Qtc cannot fall below Qts (1.97)), the system exhibits an F3 of 166.2 Hz.
What port dimensions should be used for GRS 46AS-4 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 13.4 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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