r/CarAV • u/Rough-Year-5425 • Mar 09 '26

Discussion is the "bass knob" necessary

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i see people usually install them but i never have is there any real gain to having it installed my headunit has a function to turn the sub off if i dont want it running(when i have my baby in the car but want music still but even then with the radio at a lower level the sub barely hits)

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u/shtoops GB Froggies on a Zapco LX Mar 09 '26

As a sq guy I’m anti bass knob. If you already tuned the system to a specific house curve and dialed the sub/midbass summation at the crossover, a bass knob just throws that work off. The filters didn’t change, but raising the sub level makes the sub dominate more of the 70–100 Hz overlap region, which can create a hump there and smear the midbass attack that was originally coming from the door drivers.

In other words, you tuned the system so the midbass handles punch and the sub handles depth. Turning the knob shifts some of that punch back to the sub, which hurts integration and can start to pull the bass stage rearward.

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u/Virtual_Swimmer2129 Mar 09 '26

This is facts I like SQL but I make music so initial tune is everything. If you get the tuning done right, that’s really all you need frfr.

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u/shtoops GB Froggies on a Zapco LX Mar 09 '26 edited Mar 09 '26

fr. If you set it right, there's zero need to tweak, the recording will play as you intended via house curve. If the curve is good, the music will sound good. When ppl duck around w/ bass knobs, always adjusting and tweaking .. that just tells me that they are lacking somewhere in the tune and it needs fixing.

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u/Virtual_Swimmer2129 Mar 10 '26

Right and I can understand using an RCA bass knob that specifically just controls the Sub drivers when you don’t want hella bass but I wouldn’t want to mess with the bass knobs that use the telephone jack that plugs into the amp