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A really good amp doesn’t just provide power. It also offers options for customizing the sound in your vehicle. The 2-channel GM-5100T provides a selectable 50Hz bass boost and a built-in crossover for fine-tuning your tunes. Plus, it comes with speaker level inputs for easy connection to an OEM headunit. Selectable 50Hz Bass Boost. Bass boost gives you more control over how your music sounds. It lets you set the optimal bass level for each speaker/sub connected to the GM-5100T, so the tone controls from your headunit can do what they do best. And because this is selectable bass boost, you can set the level at 0dB, 6dB, or 12dB, whichever sounds best to you. Built-In Crossover (80Hz Low-Pass Filter). Built into the GM-5100T is a very smart crossover network. It works like a gateway, routing the big bass signals (80Hz or lower, at -12dB/octave) to the speaker that handles them best, filtering out higher-frequency signals to that speaker. This optimizes your system’s efficiency and deliv