Massive Audio B2000.4 Blade Series - 2000 Watt, 4 Channel, Full Range Car Amplifier with Bass Boost. HIGH PERFORMANCE CAR AUDIO AMPLIFIER | One of the best values you will find for a car amplifiers for cars in the market! This 12v car amplifier features: 2300W x 4 @ 4 Ohm / 500W x 4 MAX, Freq: 10Hz~35KHz, Built-In OEM Line Converter, Bass Boost 0~12dB (45Hz), and Ground Loop Isolator. 12 volt output. This multi-channel amplifier for cars provides a real punch for your cars speakers or subwoofers! PRODUCES POWERFUL, CLEAN, FULL SOUND | Don't settle for weak sounding or underperforming car amplifiers. Your car audio system would not be complete without our multi-channel Massive amplifier. This car audio amplifier features: Built-in OEM line converters with RCA inputs that can take a high-level speaker signal at up to 9 Volts directly in. Full MOSFET with High Grade Switching Devices. Input Level 0.2-9.0v QUALITY TESTED AND GUARANTEED TO ALWAYS REACH ITS RATED POWER | Get more wattage and quality sound for less money! That is our guarantee! You don't need to set the gains to low to avoid distortion. These car amplifiers provides high power with low efficiency. Also, by sensing the DC offset of a factory radio it can activate the ATO (Auto Turn On) feature and Next Generation Advanced 5 Way Protection Circuitry. GREAT QUALITY PRODUCTS THAT WILL LAST LONGER | With 5-Way Advanced Protection and custom high-grade components your investment will last! With our extra features like Built-in Noise Reduction Circuitry, Auto Sensing Turn On Function, 12V Remote Output for External Devices (Hi-Level Inputs), and Mil Spec PCB with SMD parts ensure you get your money's worth! MASSIVE AUDIO QUALITY GUARANTEED. Since 1999, Massive Audio has been an industry leader in high performance audio products. Massive Audio laid its roots in high quality audio reproduction through in-house engineering and a dedication to customers. Built-In OEM Line Converter HPF, LPF, Band PassCrossovers (12dB ~ 24dB) Up to 9 Volt Input via RCA or High Level Speaker Leads Bass Boost 0dB ~ 12dB @ 45Hz Built-in Noise Reduction Circuitry Full MOSFET with High Grade Switching Devices Built-In,DC Offset,Auto Sensing Turn On Function (Hi-Level Inputs) 12V Remote Output for External Devices (Hi-Level Inputs) Variable Hi or Low Pass Crossover Frequencies from 50Hz ~ 3KHz Ground Loop Isolator Illuminated Soft Blue Logo back-lit with precisely placed LED&#039;s Next Generation Advanced 5 Way Protection Circuitry RCB ~ 4 Farad Capacitor (Optional) (Except B2000.5) CH 1/2 &amp; CH 3/4 Crossover Select Switch High Output Power Supply &amp; Dual Output Voltage Mil Spec PCB with SMD parts World Wide Standards Compliant (RoHS, E-Mark, CTA-2006, CE)