The sub is and always has performed like its just came out of the box.
Grand Touring Series 15" Dual 4 ohms Subwoofer GTO 1504D
- 15" Dual 4 Ohms Grand Touring Series Subwoofer
- Power Handling:
- Peak: 1200 watts
- RMS: 300 watts
- Impedance: Dual 4 ohms
- Polypropylene cone woofer
- Hi-roll rubber surround
- Vented polepieces
- Progressive spider
- Frequency response: 23-400 Hz
- Sensitivity: 93 dB
- 1-year SonicElectronix.com warranty
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.
Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.
Recommended Enclosure Specifications
Sealed: These enclosures completely enclose the air inside the box. These boxes produce a tight bass.
Ported/Vented: These enclosures have a slot of air to escape from the box. The result is a sound that has more "boom".
Bandpass: These are a combination of both sealed and ported enclosures. They can be very efficient, but require tuning for the best response.
Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.
What is in the box?
Specials with this Item
Warranty and Return Policy
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Internal Product ID
Wiring Diagram Legend
Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.