CT Sounds Universal Bass Knob - Digital Voltmeter, Blue LED Display, Remote Gain Control, Power Switch, Durable, Pushable ON/Off for Amp
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Extended holiday returns
FREE refund/replacement until Jan 31, 2026 Learn more
FREE refund/replacement until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Nov 16 – Nov 17
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Features
- CT Sounds Universal Bass Knob with Digital Voltmeter
- Rotary Pushable ON/OFF & Gain Control Knob for Amp
- Digital Voltmeter (10V~15.9V) Blue LED Display (High Voltage/ Low Voltage/ Protect Mode)
- Compatible with Most Head Units/Amp Combinations
- In-dash/Under-dash mountable
Brand: CT Sounds
Color: Blue
Item Weight: 3.98 Ounces
Input Voltage: 1E+1 Volts
Output Voltage: 15 Volts (DC)
Package Dimensions: 6.46 x 4.09 x 1.26 inches
Item Weight: 3.98 ounces
Item model number: CTS-UMBK-1
Is Discontinued By Manufacturer: No
Date First Available: September 17, 2016
Manufacturer: CT Sounds
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Nov 16 – Nov 17
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I wanted to share my experience in case it helps anyone running into a similar issue. I’m running two amps — one for subs and one for mids and highs. Both amps were originally sharing the same remote wire coming directly from the stereo. When I installed a universal bass knob, I connected it to that same shared remote wire. However, the amps wouldn’t power on. At first, I thought the knob might be defective. After checking with a multimeter, I realized the wire was only sending about 3V back to the amps — not the 12V needed to power them up. To fix the issue, I ran separate remote wires from the stereo: • One wire goes from the stereo to the universal knob, then to one of the amps. • The other amp gets a direct remote wire connection from the stereo. After setting it up this way, everything worked perfectly — both amps are now getting a full 12V signal. So, heads up: it seems the universal knob doesn’t play well when sharing the remote wire between multiple amps.
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Reviewed in the United States on August 6, 2025 by Alfredo G. Vera
I was a somewhat skeptical the sound would reduce in volume or quality before I purchased but neither of those fears came true, this thing is great. The voltmeter seems accurate but the hole in the side has a pot to allow you to calibrate it, if needed. The knob is not loose, it has a "dead zone" where it doesn't turn the control its attached to. It will definitely not get turned by loud music or bumps. The power LED is ridiculously bright, and I knew that from the reviews, so I hid it inside of a 1-din pocket with a flip-up door, available from Subaru for Foresters but made to work in my WRX. I like that it says "On" when powering up and "Off" when powering down, either by ignition or by the button on the dial. I pulled it open and was surprised to see its chip controlled on a high quality PCB. The wires are tiny and the RCA's aren't the best in the world but they do what they need to do. All of the wires are on JST type connectors to attach them to the PCB so I could probably replace all of them if I wanted to. I got a 4 wire connector that had matching wire colors and put that on the end, soldered and shrink wrapped. The car side of the connector was soldered into the wiring harness and the remote wires were crimped, being assembled in the car. I used a short 1.5' RCA to go to the radio. Makes for a very slick knob that does everything its intended to very well.
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Reviewed in the United States on January 21, 2021 by Jeremy S. Lepel
Works good as a bass knob, I don’t have the voltmeter hooked up yet
Reviewed in the United States on July 4, 2025 by Andrew
Just got back into car audio after a 25 year break. Anyone that uses aftermarket amplification needs one of these things It's blue LED display matches my cluster lights and the product is heavier than I expected, meaning good quality. There is a tiny bit of play in the knob and the unit is sealed surprisingly well. Thought I would take it apart to attempt a fix but after repeated tries of pulling the knob off I was worried it would break before it came off. So I gave up. There's bass knobs for half the price on here and EBAY but they're junk.
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Reviewed in the United States on March 27, 2021 by HENRY T.
I decided to give this a try since my Alpine MRP-1000 does not have an RJ45 port and I am so glad I did. This CT Sounds Bass Knob does exactly what it stated it would do. Upon it's arrival, I scratched my head trying to figure out where I would install this on my 07 Scion tC; and at first I was going to screw it to the underside of my dash, but no, I wanted it to look professional. After taking some measurements, I decided to cut the devices screw tabs off so that it would fit perfectly in the center console pocket. After modifications to the underbelly of the pocket, this little guy fit like a glove. Unfortunately, the knob protrudes beyond the closing point of the cover, so it has a 1/4" rise to it when closed. Which isn't a big deal for me. Plus, when I want to turn the device on/off, all I have to do is push the cover when it's closed. BAM! It will be open most of the time anyway. And the best thing about it's location is that while driving, since my right arm is always resting on the console, I have super easy access to adjust the output. I have noticed (as other reviews have mentioned) that there is indeed a cutoff point where it doesn't really have much of an impact. Again, that is no big deal for me as the ease of use saves me the hassle of taking my eyes off the road while driving just so I can navigate through my head units touch screen functionality. The included wiring diagram on the back of the package was perfect for an easy install. I did however order the exact colors of the wires needed (18AWG) so that I could solder at the unit and made a custom wire harness just for extra pizzazz. Used quick connect ends for the remote wires in the event I ever have to remove it and piggy backed directly off the head units power and ground. Too easy! Overall, I am very happy with this purchase and I highly recommend this CT Sounds Bass Knob! Looks awesome - sounds awesome!
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Reviewed in the United States on July 23, 2023 by Hi-Yah Hi-Yah