Best current price£134.98from eBay
Shopping.co.uk recommended and popular offers
eBay£134.98Visit shop In Phase XTB-8A 8"" Active Subwoofer 600W Powered Bass Box Amp + Remote & Quick
Visit shop4 offers from £134.98 - £149.99
View price history by clicking the chart icon.
The In Phase XTB-8A is designed for car audio enthusiasts seeking to enhance their vehicle's soundstage with deep, resonant bass without sacrificing significant trunk space. By integrating a powerful 300W RMS Class D amplifier into a compact 8-inch enclosure, it provides an efficient way to achieve professional-grade low-frequency output. While it delivers impressive power for its size, users should note that as an 8-inch driver, it is optimized for musical accuracy and punch rather than extreme high-volume SPL competition-level sound pressure.
| Model Part Number | XTB-8A |
|---|---|
| Brand | In Phase |
No, a dedicated car audio amplifier wiring kit must be purchased separately.
Yes, but you will need a line output converter (LOC) if your factory head unit lacks dedicated RCA subwoofer outputs.
The phase switch aligns the subwoofer output with your cabin speakers to ensure they are pushing and pulling air in unison, which improves bass impact.
Start with the LPF at 80Hz and adjust upward or downward until the bass transition between your door speakers and the subwoofer sounds smooth.
It is recommended for convenience, but the subwoofer will function without it if you prefer to keep your settings static.
Verify the power status LED on the unit. Check the remote turn-on wire and ensure the fuse on the power cable is intact.
Reduce the input gain on the subwoofer and ensure your head unit's bass EQ settings are not overly boosted.
Check your ground connection for a tight, metal-to-metal contact and ensure the battery voltage is sufficient.
Installation requires a standard car audio wiring kit including a fused power lead, ground cable, and RCA signal cables.
To maintain the unit, keep the enclosure free of heavy objects that could dent the driver or restrict the port airflow. Periodically check the quick-release terminals to ensure they remain snug and corrosion-free.
