DC Audio M4-6.5" Subwoofer
Key features
- Subwoofer size: 6.5 inches
- RMS power per subwoofer: 300 W
- Voice-coil options: D2, D4
- Mounting depth: 5 inches
- Mounting cutout diameter: 6.02 inches
- Voice-coil diameter: 2 inches
DC Audio M4-6.5" Subwoofer - Dual 2 Ohm is backordered and will ship as soon as it is back in stock.
Description
Description
Product Overview
The DC Audio M4 6.5-inch subwoofer brings bass to compact car audio installations where enclosure space is limited. Its dual voice coil design, 300 W RMS power handling, and small-box recommendations give you options for planning a space-conscious build.
Key Features & Benefits
- Compact enclosure recommendations: A 0.15 ft³ sealed box or suggested 0.3 ft³ ported box per speaker can help preserve usable cabin or cargo space.
- Reinforced cone and surround: The rigid non-pressed paper cone and multilayer polymer foam surround support controlled cone movement.
- Stable suspension: Laminated Nomex spiders help maintain consistent suspension characteristics under load.
- Dual voice coil: The 2.0-inch copper voice coil is available in D2 and D4 versions for different wiring requirements.
- Rigid construction: The die-cast aluminum frame and fully CNC-machined, FEA-optimized motor assembly support precise mounting and alignment.
- High-excursion connections: Sewn flat heavy-duty tinsel leads provide electrical connections during cone movement.
Technical Specifications
The specifications below retain the D2 and D4 values as listed. Box volumes are per speaker.
| Specification | D2 | D4 |
|---|---|---|
| Mounting depth | 5" | 5" |
| Mounting hole diameter | 6.08" | 6.08" |
| Outside driver diameter | 7.16" | 7.16" |
| Voice coil diameter | 2.0" | 2.0" |
| Displacement | 0.05 ft³ | 0.05 ft³ |
| Power handling, RMS/peak | 300/600 W | 300/600 W |
| Ohm option | D2 | D4 |
| Sd | 132.734 cm² | 132.73 cm² |
| Vas | 1.933 L | 2.029 L |
| Cms | 0.077 mm/N | 0.081 mm/N |
| Mms | 109.52 g | 84.98 g |
| Fs | 54.70 Hz | 60.65 Hz |
| Bl | 16.85 N | 19.10 N |
| Re | 4 Ω | 8 Ω |
| Le | 0.00 mH | 0.00 mH |
| Qms | 3.729 | 4.671 |
| Qes | 0.530 | 0.705 |
| Qts | 0.464 | 0.613 |
| Xmax | 16 mm | 16 mm |
| Reference SPL @ 1 watt | 79.6 dB | 79.9 dB |
| Suggested sealed box | 0.15 ft³ | 0.15 ft³ |
| Suggested ported box | 0.3 ft³ | 0.3 ft³ |
Construction details include a custom-tooled motor boot and rubber mounting gasket. The product also has a die-cast DC aluminum black frame with no-invert mount design. The DVC 2.0-inch copper voice coil is paired with a fully CNC-machined motor assembly.
Why Choose This Product?
The M4 is designed for builds that need a subwoofer in a tight space. Its suggested enclosure volumes offer a clear starting point when you are planning around a compact trunk or cabin installation.
The two voice coil versions have different resistance and Thiele/Small values, so choose the version that matches your system plan. Its 300 W RMS and 600 W peak ratings help you assess the subwoofer alongside the other components in your audio system.
Installation & Compatibility Notes
Allow for a 5-inch mounting depth, a 6.08-inch mounting hole, and a 7.16-inch outside driver diameter. Check the available mounting area and enclosure space before selecting a location.
The recommended enclosure volume is 0.15 ft³ sealed or 0.3 ft³ ported per speaker. Confirm the selected D2 or D4 version suits your amplifier and planned wiring. The supplied product details do not specify a wiring configuration.
Frequently Asked Questions
What is the difference between the D2 and D4 versions?
The versions have different voice coil resistance values: 4 Ω for D2 and 8 Ω for D4. Their listed Thiele/Small parameters also differ. Choose according to your system’s requirements.
What enclosure size is recommended?
The suggested volume is 0.15 ft³ for a sealed box or 0.3 ft³ for a ported box, per speaker.
How much power does the M4 handle?
Power handling is rated at 300 W RMS and 600 W peak. Match the subwoofer to your system using the rating and the selected voice coil version.
What mounting space does it need?
Plan for a 5-inch mounting depth, a 6.08-inch mounting hole, and a 7.16-inch outside driver diameter.
Explore More
Shop the DC Audio M4 subwoofer at 12 Volt Outlet and plan your compact bass installation around the space and system you have. Explore the brands we sell through our brand directory.
| M4 6.5" Subwoofer | D2 | D4 |
|---|---|---|
| Mounting Depth | 5" | 5" |
| Mounting Hole Diameter | 6.08" | 6.08" |
| Outside Driver Diameter | 7.16" | 7.16" |
| VC Diameter | 2.0" | 2.0" |
| Displacement | .05 ft³ | .05 ft³ |
| Power Handling rms/peak | 300/600 | 300/600 |
| Ohm Options | d2/d4 | d2/d4 |
| Sd | 132.734 cm² | 132.73 cm² |
| Vas | 1.933 L | 2.029 L |
| Cms | 0.077 Mm/n | 0.081 Mm/n |
| Mms | 109.52 g | 84.98 g |
| Fs | 54.70 Hz | 60.65 Hz |
| Bl | 16.85 N/A | 19.10 N/A |
| Re | 4 Ohm | 8 Ohm |
| Le | 0.00 mH | 0.00 mH |
| Qms | 3.729 | 4.671 |
| Qes | 0.530 | 0.705 |
| Qts | 0.464 | 0.613 |
| Xmax | 16mm | 16mm |
| Ref SPL @1 watt | 79.6 db | 79.9 db |
| Suggest Sealed Box | 0.15 ft³ | 0.15 ft³ |
| Suggested Ported Box | 0.3 ft³ | 0.3 ft³ |
Recommended Monoblock Amplifiers
Power-matched options for one subwoofer or one complete loaded enclosure. We aim to include same-brand choices when their ratings qualify.
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Suggestions use 75–125% of the subwoofer’s RMS rating at the wiring load shown. Check wiring, enclosure needs, electrical capacity and installation space. Set gain and filters correctly to avoid overpowering the subwoofer. Buying more than one subwoofer changes the match.
