LU-15 - Subwoofer Earthquake Sound - Free user manual and instructions
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| Product Type | Subwoofer |
| Brand | Earthquake Sound |
| Model | LU-15 |
| Speaker Size | 15 inches |
| Impedance | 4 ohms |
| Frequency Response | 20 - 200 Hz |
| Sensitivity | 92 dB 1W/1m |
| RMS Power Handling | 500 Watts |
| Peak Power Handling | 1000 Watts |
| Recommended Enclosure Volume | 2.5 cu ft (sealed) / 3.0 cu ft (ported) |
| Mounting Depth | 180 mm |
| Mounting Diameter | 355 mm |
| Overall Dimensions | 420 x 420 x 180 mm |
| Net Weight | 10 kg |
| Voice Coil | 2-inch high-temperature aluminum |
| Magnet Type | Ferrite magnet with 80 oz weight |
| Installation Type | Standard 15-inch subwoofer enclosure |
| Recommended Amplifier Power | 300 - 600 Watts RMS per channel |
| Maintenance | Wipe with a dry, soft cloth; avoid moisture |
| Spare Parts Availability | Replacement cones, surrounds, and voice coils available via authorized service centers |
| Warranty | 1 year manufacturer warranty |
Frequently Asked Questions - LU-15 Earthquake Sound
How do I properly break in my LU-15 subwoofer?
Play a low-frequency test tone at a moderate volume (around 25% of max power) for about 20 hours. This gradually loosens the spider and surround, ensuring optimal cone excursion and sound quality.
What is the recommended enclosure size for the LU-15?
For a sealed enclosure, use 2.5 cubic feet. For a ported enclosure, use 3.0 cubic feet with a 4-inch port tuned to 30 Hz. This offers a balance of low-frequency extension and power handling.
Can I use the LU-15 in a sealed enclosure?
Yes, the LU-15 works well in sealed boxes. A sealed enclosure provides tighter, more accurate bass and is generally more compact. Follow the recommended volume of 2.5 cubic feet for best results.
What is the optimal crossover frequency for the LU-15?
Set the low-pass crossover to around 80 Hz if running a full-range system, or up to 100 Hz if paired with small satellite speakers. Avoid frequencies above 120 Hz as they negatively affect directional bass and clarity.
How do I wire two LU-15 subwoofers to my amplifier?
The LU-15 has a single 4-ohm voice coil. With two subwoofers, you can wire them in parallel for a final load of 2 ohms, or in series for 8 ohms. Verify that your amplifier is stable at the resulting impedance to prevent overheating or clipping.
What is the RMS power handling of the LU-15?
The LU-15 is rated at 500 Watts RMS, meaning it can handle a continuous 500-watt signal. Peak power is 1000 Watts. For reliable performance, match it with an amplifier delivering 300–600 Watts RMS per channel.
How do I mount the LU-15 correctly?
Use all six mounting holes and secure the subwoofer with screws that are long enough to penetrate the enclosure at least 1 inch. Make sure the magnet and voice coil are centered in the cutout to avoid friction and distortion.
What is the impedance of the LU-15 and how does it affect amplifier selection?
The LU-15 has a single 4-ohm voice coil. This is a standard load that most mono subwoofer amplifiers support. When selecting an amplifier, ensure it is rated to deliver power at 4 ohms.
Can I use the LU-15 in a home theater system?
Yes, the LU-15 can be used in a home theater if you place it in a suitable enclosure and power it with a dedicated subwoofer amplifier. Its 20–200 Hz frequency response is well suited for movie effects and music.
How should I maintain and clean the LU-15?
Dust the dust cap and surround with a soft, dry microfiber cloth. Do not use any liquids or chemicals as they can damage the paper cone and foam surround. Periodically inspect the mounting screws and seal for air leaks.
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USER MANUAL LU-15 Earthquake Sound
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Product information
Brand : Earthquake Sound
Model : LU-15
Category : Subwoofer