CT Sounds Universal Bass Knob - Digital Voltmeter, Blue LED Display, Remote Gain Control, Power Switch, Durable, Pushable ON/Off for Amp
Condition: New
$39.99
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Extended holiday returns
FREE refund/replacement until Jan 31, 2027 Learn more
FREE refund/replacement until Jan 31, 2027 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027
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
Saturday, Nov 14
At a glance
- Condition
- New
- Model
- CTS-UMBK-1
- Weight
- 3.98 oz
- Color
- Blue
- Part Number
- Universal Bass Knob
- Style Name
- Digital,Durable,Universal
Features 5
- 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
Specs 9
| Brand Name | CT Sounds |
|---|---|
| Model | CTS-UMBK-1 |
| Global Trade Identification Number | 47 |
| UPC | 850021258047 |
| Manufacturer | CT Sounds |
| Item Weight | 3.98 ounces |
| Part Number | Universal Bass Knob |
| Color | Blue |
| Style Name | Digital,Durable,Universal |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Nov 14
Yes, absolutely! This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027.
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
Awesome!
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 Average consumer
Better than your amps Boost knob
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
This will elevate your experience
Bought this alongside CT sounds wiring kit. Absolutely the best combination of sound equipment I’ve ever owned. This 3 wire set up works great. I tied into my stereo wiring harness and it’s been just fine! I think it’s a great value for something so amazing.
Reviewed in the United States on December 29, 2025 by Camilo
Good upgrade
Good product I really like the blue display base knob works as it should. What highly recommend for someone looking to upgrade their base knob.
Reviewed in the United States on February 27, 2026 by Roberto g huerta
Works great. Durable and easy to set up
I have had this for a few months, it has been working great and was pretty straightforward to install. I’ve also accidentally kneed it a couple times getting out of the car and it has survived so that’s a bonus too UPDATE: after I hit it with my knee again for the 10th time the knob broke off but I bought a new one and replaced it and have been extra careful since. I still love this thing and it’s super convenient for adjusting my sub without having to touch the amp and it’s a big bonus seeing the battery voltage
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Reviewed in the United States on April 8, 2023 by Austin B.
its just an amp gain.
..with that being said. lets start wit the good . 1- it works and it has a voltage gauge on it if you need it. 2- it works like you think it does. it just decreases/increases the gain control to the amp. that's all, no more no less. ok and on to the bad. the rca leads are about 2 inches. yes ,2 INCHES. that's so dang short for something like this. 6 inches is the norm for something of this type but they skipped on that part. 2- you have to set the guage with a very small screwdriver or it will be off. the voltage is adjustable on the unit but if you do not have a screwdriver with a Very fine point on it, you will not adjust it. it ONLY matters if you care about the voltage gauge on it. there is an on off button on the doohickey that's the actual gain knob. press it in and it send voltage to the remote wire on the amp. did i use that? nope, not needed for me But its helpful for ...somebody somewhere. so to make it short. there's a voltage guage on it that's adjustable and has no effect on anything other than the display on the unit ,short rca leads and a side screw for voltage adjustment that requires a VERY fine point screwdriver. even the pointy end of a wire tie wont fit it. over all i give it a 7-8 out of 10. i removed 2 stars for the short rca ( not that big of a deal BUT IS A big deal if you are mounting it where 2 panels meet inside the car. it makes it bulge out a bit. and for the adjustment screw. side note. the voltage adjustment is NOT for GAIN control. its ONLY TO MATCH THE VOLTAGE OF YOUR CA AND NOT FOR RCA VOLTAGE. just had to say that part.
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Reviewed in the United States on December 29, 2023 by x infektid x
Cannot share remote wire
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
Not Impressed. Great Idea Poorly Executed.
Would not buy again. Switched from a Skar Audio bass knob and will be switching back. The Skar Audio knob is metal and the know itself feels tight when turned. This one however feels plastic and cheap. The knob turns very easy, not tight like the other one. This may be a matter of personal taste though. Also the knob does not seem to be fully linear. The first half of the knobs range barely makes any audible difference while the second half of the knob makes a lot of difference. The Skar audio knob was completely linear across the knobs entire range. Biggest issue is the voltmeter, which is the whole reason I got this knob in the first place. It is off by almost 1V. My voltage will read 14.1v on my head unit, my multi-meter, and my cars ECU. But this will display anywhere from 13.1 to 13.5. Odd thing is I have it connected to the same line as the head unit. I assumed the head unit was wrong but after further testing everything reads the same except this bass knob. Complete waste of $30. Also have had issues where it gets stuck displaying "Off" or "On". or the voltmeter just wont turn on at all at times. I know I may have just received a defective unit being my first experience with CT Sounds I will stay away in the future. *Update* Voltmeter starting working normally again, still wrong but working. Worked for maybe a week and is now completely dead. This thing is garbage. Will be removing once the heat lets up... *Second Update* Voltmeter started working again and then stopped. It now will not turn off and displays random characters. Knob also came off. Easy fix, I know. But should not have to be fixing anything. Thing is garbage. Get a quality bass knob and voltmeter. Was a nice concept but they either use garbage components or employ terrible engineers. Avoid this garbage and save some money.
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Reviewed in the United States on March 22, 2017 by shaun blackman