Pyramid NS12 12 Amp InLine Noise Suppressor

by Pyramid

Product Features

• Easily Installed 12 Amps
• Reduces and Eliminates Engine Interference
• Compatible w/Receiver, Equalizers & Amplifiers

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Product Description

Pyramid NS12 12 Amp InLine Noise Suppressor

Most Helpful Customer Reviews

19 of 20 people found the following review helpful

5.0 out of 5 stars Fixed my noise issue November 9, 2009

By K. Agar

Amazon Verified Purchase

I replaced my OEM stereo in my 2001 RAV4 with an HD radio (Dual XHD6425) about a year ago. Then I noticed my RAV seemed to have turned into a turbo-charged vehicle because of the noise coming from my speakers when I accelerated (it took me a while to figure out what it was, I thought it really was my engine since the pitch varied with engine rpm). Some on line investigation yielded the source of the problem--alternator noise was being picked up via the new stereo's 12V power input. I guess it is a common problem with more sensitive amplifiers, and also if you don't have a really solid ground to the vehicle frame. I installed this filter in series with the 12V supply to the receiver, into the adapter wiring harness supplied with the new stereo (I soldered the connections although a decent crimp job should do just as well). I also added a tap wire off the ground wire in the harness so that I could ground the stereo in close proximity, instead of relying on the vehicle wiring. The alternator whine noise is completely gone now.

This filter is larger than I expected, about 1" diameter, 1.75" long. I had no problem fitting it behind the new stereo, but others may have less available space.

12 of 12 people found the following review helpful

5.0 out of 5 stars It worked. February 9, 2010

By Andrew Hinson

Amazon Verified Purchase

2006 Toyota RAV4

We have a portable dvd player connected to the cigarette lighter dc power source and audio output through the stereo's aux input (1/8" headphone jack both in the center console). Before installing the filter, there was a whine that was synchronized with the rev of the engine.

The filter solved the problem without using the optional ground making this one simple install.

If you're experiencing ground loop noise, I recommend giving this a shot as a simple, inexpensive solution.

11 of 11 people found the following review helpful

5.0 out of 5 stars Works perfectly to remove all ignition noise at my accessory socket September 19, 2010

By EngrPaul

Amazon Verified Purchase

I have a Honda s2000, and always had noise thorugh the AUX input of my stereo while using a MP3 player plugged into the accessory socket. I would say it sounded like a buzzing or whistling... the pitch matches the RPM of the engine. It did not happen when not plugged into power or if the engine was not running. Therefore, I figured my alternator or ignition was sending noise through the 12V power line.

I installed this NS-12 directly behind the accessory (lighter) socket. I'm glad there was a lot of open space behind the panel, because this unit is rather large.

The noise is COMPLETELY gone. I'm very pleased that the solution was so inexpensive.

NOTE: Not everbody will have noise from their accessory socket, sometimes it's bad wiring at the stereo speaker wires, amplifiers, or poor ground connections. You may want to check these first. I personally had an experience on another car where my input cable from the mp3 player developed a bad connection from flexing the cable, and noise came into the head unit. Installing a new cable solved the problem on that car.

There are other types of noise filters, some people need filtering at the RCA connections. If this filter does not work for you, it's possible your noise is not coming from the power input. There is no harm installing this device, you might as well give it a try.

It's a shame people are giving it a low score because it did not solve all their problems. It's like giving a roof repairman a bad grade when the water is coming in through the basement!

2 of 2 people found the following review helpful

1.0 out of 5 stars Replaced alternator whine with loud ticking in speakers March 21, 2012

By subiedoo

Amazon Verified Purchase

I figured for $12 shipped it was worth giving this a try for getting rid of some alternator whine. The box states that you can install this with or without the ground. Without the ground, I heard no difference in the noise coming through my speakers at all. With the noise suppressor grounded, the volume of the alternator whine was reduced by about 80% (unnoticable unless volume was turned all the way down). The problem is that with the noise suppressor grounded (I tried multiple good grounding points on the vehicle and they all behaved the same way) it introduced a loud ticking noise through the speakers that increased with RPMs up to about 3000 RPM. I contacted Pyramid's support and never got a reply from them, it's been about 2 weeks now.

I ended up removing this unit since the noise it created was a lot more annoying and noticable than the alternator whine it got rid of. Aside from that, Pyramid's technical support was non existent and their instructions on the box were awful. If they're going to say you can hook it up without the ground, they should specify which situations you would want to ground or not ground it. Their web site doesn't have any more information about the unit than the Amazon product page either. Keep your $12 and buy a noise suppressor circuit from a company that actually lists the specs of the device and provides decent instructions/support.

2 of 2 people found the following review helpful

4.0 out of 5 stars Good Productto elimiate noise from power system. November 16, 2011

By S. Wild

After a week of troubleshooting this finally eliminated 95% of the alternator noise I was chasing. This is an excellent product if you have noise coming into your stereo from your vehicles power and charging system.
Most say that poor grounding is the source for most noise so i started by grounding my headunit to the same place as my amp. That didn't work so I tried grounding both directly to the frame. No improvement. I then tried a ground loop isolator. that didnt work so I tried this. The point is this is a good solution for the right kind of noise. If this doesn't work and a ground loop isolator does, its not because this is a bad product, it is because you had a ground loop, not a power problem.