By Mathilde Hamlin. Car Audio. Published at Wednesday, June 27th, 2018 - 19:08:39 PM.
A more economical way to upgrade your sound system without changing the factory receiver or speakers is to get a compact 4-channel amp to boost the power for your front and rear speakers. The Alpine KTP-445U Power Pack and the Clarion XC1410 4-channel amp are two examples of amplifiers that are small enough that they can be installed behind many dashboards and powerful enough to dramatically increase the quality and clarity of your sound. Both of these amps, as well as many others available at Crutchfield, feature inputs that can handle the high-level signal from the vehicle's factory speaker wiring. Look for an amplifier with "speaker-level inputs" as one of its features if you want to add it to a factory system.
External crossovers. Component systems typically use passive external crossovers to achieve clean separation between the frequencies sent to the woofer and tweeter. The woofer and tweeter don't waste energy by trying to reproduce frequencies they're not intended to reproduce. As a result, you'll enjoy cleaner, more efficient sound reproduction.
Bluetooth® usability. Bluetooth lets you enjoy hands-free conversation using your compatible phone. You’ll be able to see caller information instantly with a big screen in your dash, so you can keep your eyes on the road and your hands on the wheel. Some receivers also allow audio streaming from phones.
Ported boxes: For forceful bass. Ported boxes use a vent (called a port) to reinforce low bass response. You get more output than you would from a sealed box at any given amplifier wattage. Some people prefer the sound of ported boxes for rock, heavy metal, or any hard-driving music. Ported boxes can deliver deeper bass than sealed boxes, though they need to be much larger than sealed enclosures to accomplish that.
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