Will 9 volts hurt an amplifier with rca inputs rated at 4 volts? do you just lower the gain on the amps? the amps are alpine 50 watts x 4 channels.

This will not hurt the amplifier. The output voltage is not a full time constant 9v.

does this come with as bass knob

No, but you can adjust the signal level going into your subs from this crossover.

este producto es chino?

Es chino pero la verdad es de muy buena calidad es muy buena marca reconocida en latino america

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🎵 Elevate your ride’s soundstage — because your car deserves concert-level clarity!

CUSTOM BASS BOOST - Adjustable 0-12dB boost at 45Hz for that deep, punchy low end
SLEEK COMPACT DESIGN - Fits seamlessly into any car audio setup without clutter
USER FRIENDLY CONTROLS - Quick on/off switches and individual level adjustments for effortless tuning
POWERFUL SIGNAL DELIVERY - Up to 9 volts RMS output ensures crystal-clear audio clarity
PRECISION SOUND SCULPTING - 4 RCA inputs & 6 outputs for ultimate multi-way control

The PRV Audio EX4.6 PRO is a versatile 3 or 4-way electronic crossover designed for car audio enthusiasts seeking precise control. Featuring 4 RCA inputs and 6 outputs, it delivers up to 9V RMS output with adjustable high-pass/low-pass filters and a bass boost of up to 12dB at 45Hz. Compact and easy to install, it offers individual channel on/off switches and level controls for a perfectly balanced, professional-grade sound experience.

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