DS18 HYDRO NXL-F4 Flush Mount Class D Full-Range Marine 4-Channel Boat, ATV, UTV Amplifier with Voltmeter 1200 Watts The F4 is an exact duplicate of the very popular NXL-400.4 but now offered in flat mount configuration so you can keep a flush and clean look to your install. This 4 channel amplifier is the go to source to power all your DS18 marine speakers as all are an amazing fit with this sleek and powerful hydro amp. Highlights Flush / Flat mount design so you can keep your install looking clean and flush. Great to power all DS18 NXL series speakers with great loudness and efficiency. Full Range configuration so it can be used for virtually any speaker within its power recommendations. Technical Details NXL-F4 Product Manual Power Output @ 2 ohms 160Wx4CH Power Output @ 4 ohms 100Wx4CH Bridge Power Output @ 4 ohms 320Wx2CH Total Harmonic Distortion <0.1% S/N Ratio Red 1W @ 4 ohms 90dB Gain Range 0.2-6V Crossover Range 40 - 400Hz Frequency Range 20Hz - 20KHz Bass Boost 0-18dB (Rear CHs) Forced Cooling System N/A Bass Remote Control N/A Topology Operation Full Range Digital Dimensions (MM) 238 x 135 x 41