Not the prettiest little device, but definitely does the job it was purchased for. Super simple install (inline to the AUX jack) and instant results. For reference, this is being used on a 2009 Mazda 3 with the infamous whine induced by having a device (phone in this instance) plugged into AUX audio port and charging from a 12v car charger at the same time. The PAC SNI-1/3.5 has been in place for about a year now and still works like a champ. This is a must-have to eliminate alternator whine.

I bought this filter for hooking up my smartphone to my aux input in my car's stereo system. I was getting constant very bad noise when I listened to music on Pandora through my car system (I think the noise is from the processor in my phone). This filter took almost all of the noise away and I am able to enjoy my music. I do, still, however get these little high frequencies pitches of noise which aren't so bad and I can live with them.

This product works as advertised. Used to connect a DroidX to the stock radio in a Chevy Cruze. Small enough to fit in the center armrest with room to spare.

I bought this device as a hum elimitator between a computer and a sound board. Works pretty good as long as the volume from the sound board is up.

If you have an audio source that is being degraded by an ambient noise. This will do the trick. I have bought two of these for this application. It worked in both situations. It could be smaller, but that is a minor flaw.

I like this. It does what it is supposed to do equalize the harmonics in the sound system on my motorcycle.

This product works to clarify your listening enjoyment.. Simply installation too. just plug in.

This unit works very well to remove ground loop noise and whine, but it also decreases the volume slightly about 1.5 dB according to my measurements.

Just as many have said about this type of product ... works very well to cancel out "noise" (hiss) when connecting your satellite radio receiver to your head unit aux input. some have mentioned that these tend to filter out a lot of the highs and lows, but when you are listening to satellite broadcasts, the fidelity of the audio is somewhat muted anyway.

i give this unit a thumbs up for the removal of the hiss, for the quality of the filtered audio, and for the benefit of having to only use your existing audio patch cable. many other units are RCA-type female connectors. they would require larger and more cables to complete your setup.

even if you do not think this would improve your audio, or if you think that your xm/sirius sound is okay, get one of these and realize better sound with your system.

Product works as described.

Works as advertised.. No more iPhone noise through the aux input in my car stereo.

Works as advertised, reasonable cost. I still now and then get a low hum (I use it to connect my iPhone to the aux input in my Prius), but it's hardly noticeable and nothing like how it was without this device. Recommended.