Audio System Ground Loop Isolator

  1. Radioshack Audio System Ground Loop Isolator
  2. Audio Noise Filter Ground Loop Isolator
  3. Ground Loop Isolator Laptop
  4. 1 4 Ground Loop Isolator
  5. Stereo Audio Ground-loop Isolator & Filter With 3.5mm Connectors

  • 3.5mm Car RCA Amplifier Audio Noise Filter Ground Loop Isolator Suppressor N8H5

    Eliminates ground loop noise between audio source and radio. 1 x Car Audio Noise Filter. Can effectively solve the problem of car audio noise. Noise Canceling. Works with any portable device that has two 3.5mm audio jacks.
    From Hong Kong
    Free shipping
    Type: Noise Isolator

  • 2-Channel RCA Audio Noise Filter Suppressor Ground Loop Isolator Stereo 50W

    Eliminates humming and buzzing due to ground loop issues. Eliminate ground loop humming and buzzing noise between an audio source and an amplifier. Place between the head unit and the amp or EQ. Rated input: 50W.
    From Hong Kong
    Free shipping
    Type: Noise IsolatorBrand: Unbranded

  • Ground Loop Noise Filter Isolator 3.5mm Cable For Home Stereo Car Audio System

    The Ground Loop Isolator connect to the AUX Jack in car to eliminate noise.You will enjoy good quality sound when use it with Ground Loop Noise isolator. With interface design of Isolator,m can effectively protect the circuit.
    From China
    Trending at $5.14
    Type: Noise IsolatorBrand: Unbranded

  • Mpow Ground Loop Noise Isolator for Car Audio / Home Stereo System with 3.5mm

    500+Sold！ Top Quality！Fashion Appearance
    From China
    Was: Previous Price$4.99
    Type: Audio Jack CableChannels: 2
    or Best Offer
    Brand: Mpow

  • Mpow Ground Loop Noise Isolator Car Audio System/Home Stereo With Cable BEST

    <li> Mpow Ground Loop Noise Isolator for Car Audio / Home Stereo System with 3.5mm Audio Cable,Royalblue</li><li> </li><li>ELIMINATING BUZZING NOISE :</li><li>Completely eliminating the buzzing noise, caused by ground loops which happens when the audio source and the speaker use the same power source in some car speakers / home stereo systems when using the Bluetooth receiver.</li><li>WORKING PRINCIPLE : The working principle of this noise isolator is to achieve a clear speech/music by eliminating the current noise in some car speakers / home stereo systems.</li>.
    From China
    Free shipping
    Type: Noise IsolatorBrand: Unbranded

  • 3.5mm Aux Audio Noise Filter Ground Loop Isolator Eliminate Car Home Audio Noise

    When using a ground loop noise isolator you will enjoy high quality sound. Forget annoying noise! Easy to use : The Ground Loop Noise Isolator can be used with any portable device with a 3.5mm audio jack.
    From China
    Free shipping
    Type: Audio Jack CableBrand: Unbranded

  • Mpow Ground Loop Noise Isolator Eliminate Humming Car Audio System Stereo 3.5mm

    <li> </li><li>Title : Mpow Ground Loop Noise Isolator for Car Audio System/Home Stereo with 3.5mm Audio Cable (Black)</li><li>Bullet Points MPN Does Not Apply Channels 2 Brand MPOW Type Audio Jack Cable UPC Does not apply </li>.
    From China
    Was: Previous Price$4.99
    Type: Audio Jack CableChannels: 2
    or Best Offer
    Brand: Mpow

  • Ground Loop Noise Isolator for Car Audio Stereo System with 3.5mm Audio Cable

    When using a ground loop noise isolator you will enjoy high quality sound. Forget annoying noise! Easy to use : The Ground Loop Noise Isolator can be used with any portable device with a 3.5mm audio jack.
    From China
    Free shipping
    Type: Audio Jack CableBrand: Unbranded

  • RCA Audio Noise Filter Ground Loop Isolator Eliminate Car Electrical Noise

    Eliminate ground loop humming and buzzing noise between an audio source and an amplifier. Connectors: 2×RCA Male, 2×RCA Female. Summit Input: 60W. When used with car audio, this isolation circuit goes between the head unit and the amp or EQ.
    From China
    Was: Previous Price$5.95
    Type: Noise IsolatorBrand: Unbranded

  • Car Auto Home Stereos Mini Ground Loop Isolator Noise Reduction Filter A9W5

    This unit filters noise between the system and the amplifier thus eliminating hums, noise and alternator whine. Cable length:12cm. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.
    From Hong Kong
    $0.49 shipping
    Type: Noise Isolator

  • New Listing3.5mm Aux Audio Noise Filter Ground Loop Isolator Eliminate Car Electric NoiWCP

    The Ground Loop Isolator connect to the AUX Jack in car to eliminate noise.You will enjoy good quality sound when use it with Ground Loop Noise isolator. When using a ground loop noise isolator you will enjoy high quality sound.
    Type: Noise Isolator
    Was: Previous Price$6.41
    Brand: Unbranded

  • Coaxial Video Ground Loop Isolator Balun BNC Male to Female for CCTV Camera E8P6

    100% brand new and high qualityPassive, no power required.Prevents video-signal distortion caused by video ground loops.Eliminates picture tearing, cross talk and rolling.Prevents power cables laid by others interfering with the CCTV system.Insertion Loss: 0.5dBFrequency Response: 20Hz -10MHz (0～3dB)Coaxial Input/Output Resistance: 75 OhmGround Isolation : more than the 90dB more than the 50HzIsolation Voltage: DC 600V (Min)Insulation Resistance : 100M OhmTransient Voltage Suppressors: 12 VrmsDimensions: 68 x 28 x 21mm with 24cmcolor:blackMaterial: Plastic, MetalPackage included:1 x BNC Video Ground Loop Isolator1 x English Installation instructionsNote: Light shooting and different displays may cause the color of the item in the picture a little different.
    From Hong Kong
    $0.22 shipping
    Brand: Unbranded

  • 4-Channel RCA Audio Noise Filter Suppressor Ground Loop Isolator Car Stereo LA

    Eliminates humming and buzzing due to ground loop issues. Eliminate ground loop humming and buzzing noise between an audio source and an amplifier. Place between the head unit and the amp or EQ. Connectors: 4x RCA Male, 4x RCA Female.
    From China
    Free shipping
    Type: Noise IsolatorBrand: Unbranded

  • New Listing3.5Mm Audio Cable Ground Loop Noise Isolator for Car Audio System Home Q6R6

    When using a ground loop noise isolator you will enjoy high quality sound. 1 x Audio Isolator. Colour: Black. Audio port: Ф3.5 audio seat. Audio input: Stereo.
    From Hong Kong
    $0.49 shipping
    Type: Noise Isolator

  • Ground Loop Noise Isolator Eliminate Car Home 3.5mm Aux Audio System Stereo I6Y1

    1x Noise Isolator. The ground loop isolator can connect to the AUX jack in car to eliminate noise. Compact and lightweight, easy to use, you just need to plug in and it will work without battery.
    From Hong Kong
    $0.49 shipping
    Type: Noise Isolator

  • 3.5Mm Audio Cable Anti-Interference Ground Loop Noise Isolator Cancelling R W1I3

    The Ground Loop Isolator connect to the AUX Jack in car to eliminate noise.You will enjoy good quality sound when use it with Ground Loop Noise isolator. Model:Ground Loop Noise Isolator. Forget about the annoying noise!
    From Hong Kong
    $0.30 shipping
    Type: Noise Isolator

  • HOT Ground Loop Noise Isolator for Car Audio / Home Stereo System with 3.5mm

    The Ground Loop Isolator connect to the AUX Jack in car to eliminate noise.You will enjoy good quality sound when use it with Ground Loop Noise isolator. With interface design of Isolator,m can effectively protect the circuit.
    From China
    Was: Previous Price$3.86
    Type: Noise IsolatorBrand: Unbranded

  • Universal 4 Channel RCA Input Output Ground Loop Isolator Line Sound T4Z7

    Isolate and eliminate noise caused by a ground loop in an audio circuit with this Four-Channel Ground Loop Isolator. This device has four channels, composed of two pairs of stereo (L+R) inputs and outputs.
    From Hong Kong
    Free shipping

  • Ground Loop Noise Isolator Eliminate Car Home 3.5mm Aux Audio System Stereo

    The Ground Loop Isolator connect to the AUX Jack in car to eliminate noise.You will enjoy good quality sound when use it with Ground Loop Noise isolator. With interface design of Isolator,m can effectively protect the circuit.
    From China
    Was: Previous Price$3.85
    Type: Noise IsolatorBrand: Unbranded

  • Ground Loop Noise Isolator for Car Audio Stereo System with 3.5mm Audio Cable

    The Ground Loop Isolator connect to the AUX Jack in car to eliminate noise.You will enjoy good quality sound when use it with Ground Loop Noise isolator. With interface design of Isolator,m can effectively protect the circuit.
    From China
    Was: Previous Price$3.88
    Type: Noise IsolatorBrand: Unbranded

  • HKATOPS 3.5mm RCA Ground Loop Isolator AudioStereo Hum Noise Filter Audio JaNYF

    This item eliminates ground loop noise between audio source and radioWorks 4. 1 x NOISE FILTER. Noise Canceling. Works with any portable device that has two 3.5mm audio jacks. Two side Wire length: 13.5cm.
    Type: Noise Isolator
    Was: Previous Price$7.61
    Brand: Unbranded
    or Best Offer

  • Car Stereo 3.5mm AUX Audio Noise Filter Ground Loop Isolator Eliminate SNI1-3.5

    Eliminate ground loop humming and buzzing noise between an audio source and an amplifier. Eliminates ground loop noise between the audio source and radio. 1 x Noise Filter. May loose the noise, gain sound quality.
    Top Rated Plus
    Was: Previous Price$9.89
    From ChinaBrand: Unbranded
    or Best Offer

  • 3.5mm Aux Audio Noise Filter Ground Loop Isolator Eliminate Car Electrical Noise

    <li> </li><li>Description: Eliminating Humming Noise If you've got your radio, iPod, MP3 player, Bluetooth Receiver or similar audio equipment plugged into your car stereo with a audio cable and you're getting audio hum noise caused by ground loops, you need this isolator work together so that you can enjoy high quality music. Forget about the annoying noise! </li>.
    Top Rated Plus
    Free shipping
    Type: Noise IsolatorBrand: Mpow

  • 3.5mm Ground Loop Isolator AUX Audio Noise Filter Killer Reduce Noise

    Mpow Ground Loop Noise Isolator for Car Audio Systems / Home Stereo with 3.5mm Audio Cable Eliminate buzz: If your radio, iPod, MP3 player, Bluetooth receiver, or similar audio device is connected to your car stereo via an audio cable and you receive an audio buzz caused by the ground return loop, you will need the Mpow isolator to work together So that you can enjoy high quality music. Forget annoying noise! Easy to use: The Mpow can be used with any portable device with a 3.5mm audio jack. No battery needed, just plug in your Mpow and start enjoying the perfect audio Packing List : 1 pcs in one package.
    From China
    Free shipping
    Type: Noise IsolatorBrand: Unbranded

  • USEFUL Ground Loop Noise Filter Isolator&3.5mm Cable For Stereo Car Audio System

    The Ground Loop Isolator connect to the AUX Jack in car to eliminate noise.You will enjoy good quality sound when use it with Ground Loop Noise isolator. With interface design of Isolator,m can effectively protect the circuit.
    From China
    $0.35 shipping
    Type: Noise IsolatorBrand: Unbranded

Noise filter type: ground loop isolator. Connectors: 2x RCA Male, 2x RCA Female. For use with portable devices that have RCA audio outputs, including pre-amp outputs. 1 x RCA Noise Filter. Eliminates ground loop noise between the audio source and radio. When I connected the ground loop isolators last night, at the amp as suggested by the manufacturer, it made no difference. They had ground wires you could optionally ground so I did ground those as well at the same point where the HU is grounded and that actually made the noise much, much worse. Ground the ground loop isolator by screwing the terminal into a bare metal spot of the car or by plugging it in to the negative terminal of the amp. Some ground loop isolators are self-grounded while others require this step. If the ground loop isolator has additional wires - beside the RCA cables- they are for grounding.

The SNI-1 preamp noise filter plugs in between your receiver's preamp outputs and your amplifier.

What's in the box:

  • Noise filter w/ 11' RCA input leads
  • Instructions
MFR #SNI-1/50
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PAC SNI-1 reviews

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Veronica mars season 2 episode 22. 23 rows  List of Veronica Mars episodes. The first season's run of 22 episodes garnered an average of 2.5 million viewers per episode in the United States. The second season decreased to an average of 2.3 million viewers; however, it included the series' highest rated episode with 3.6 million viewers. Season Two of Veronica Mars has twenty-two episodes. The season revolves mainly around the Neptune High Bus Crash case and the Murder of Felix Toombs. It was released on DVD in August, 2006.

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Crutchfield asked: Why did you buy this?
To make sure there is no hum in my speakers [ Nicholas Aug 07, 2019 ]
Noise in the stereo [ David Mar 04, 2019 ]
I have motor like humm coming out my speakers [ VINCENT Jan 15, 2019 ]
To suppress ground loop nosie [ Carl Dec 17, 2018 ]
RCA connector on my existing filter broke internally and was intermittent. Cheaper to just replace whole unit than to solder on new rca connectors. No radio shack near me and getting this is cheaper and easier than ordering rca connectors from Amazon. [ Patrick Nov 16, 2018 ]
I don't want any noise coming from speakers, only good loud music! [ D Oct 29, 2018 ]
I have RFI and found this in the 'How to Diagnose and Eliminate Noise' Flow chart. [ Darrius D. Sep 22, 2018 ]
Getting feedback on my speakers and on DDx9905s monitor hoping this will eliminate the noise [ Joseph Sep 04, 2018 ]
Read the reviews and sounded like mine was doin as severl others and they were happy with your experience so I want to give it a shot, Thank You. [ Gary Aug 30, 2018 ]
I am hearing noise through my speakers coming from the alternator. Crutchfield support recommended I try this product to help eliminate the noise after I tried an active power filter which helped but didnt fix the problem completely. [ MICHAEL Aug 15, 2018 ]
Receiving Engine Noise through speakers. [ MARY Aug 13, 2018 ]
Want to eliminate unwanted noise [ Zachary Jul 25, 2018 ]
No matter where I grounded the amp rack, if the lead was longer than a few inches, which is not practical, there was ground loop noise. [ Eric Jul 06, 2018 ]
hopefully this will cancel out the noise at low volume [ Robert Jun 18, 2018 ]
I have motor noise in my truck stereo. I am hoping this will fix it. [ Kevin Jun 16, 2018 ]
Brand Name [ David A. Jun 13, 2018 ]
to eliminate line noise/ Pop from amplifers turning on. [ James Cody May 26, 2018 ]
experiencing subwoofer hum [ Harold Apr 30, 2018 ]
Well I needed supplies to reground all my wires so that I could get rid of this engine whining in my speakers. So I went to Crutchfield and saw they had what I needed. Plus they hooked me up with a 50 dollar gift card for doing a survey. So I went ahead and purchased what I needed and kept it pushing=] [ Carlos Apr 12, 2018 ]
Have a whine through my speakers [ Steven Mar 06, 2018 ]
Engine noise after installing new amp [ Harold Dec 19, 2017 ]

Radioshack Audio System Ground Loop Isolator

Shane in technical support recommendation [ William Nov 10, 2017 ]
Recommended by Xterra forum member for Fosgate Amp option [ Jefferson Oct 08, 2017 ]
Noise in my sound system. Recommended by Crutchfield associate. [ JAMES Sep 06, 2017 ]
Easy one stop shopping and support. MAny choices, styles and cost, Easy check out and quick service. Im trying to eliminate ground noise. [ F Jun 21, 2017 ]
Engine noise coming through the speakers after hooking up the Sound Ordinance M75-4 amplifier. Tried regrounding the amplifier and the HU. Reran the pwr cable also. Managed to minimize the engine noise significantly, but it's still there barely. I know it's there and it's driving me mad. I really hope this works. [ G Jun 03, 2017 ]
got some whine thats throttle dependent in my system. have 2 mids/high amps, and both have same noise. tried everything, so this is last resort [ Randall May 15, 2017 ]
Crutchfield had and info post about engine noise [ RJ Popham May 04, 2017 ]
To add axillary to factory car stereo so I can connect to my phone [ George May 01, 2017 ]
Spoke with a gentleman from technical support and after discussing my problem and doing some troubleshooting, this is what he recommended. [ Raymond Apr 28, 2017 ]
Ken recommended it because I was getting a buzzing sound from my Speakers that were coming from my Fusion Subwoofer. [ John Apr 23, 2017 ]
Didn't need it came with the kit [ Andrew Mar 23, 2017 ]
To hopefully remove hissing sound from my system [ Mike Feb 21, 2017 ]
New head unit, amp, sub and speakers. I have tried everything and cannot get rid of the whining noise, hope this works. [ David Jan 29, 2017 ]
Came with hthe kit. Isolates unequal ground values between chassis.. a good thing if you don't like whiny car audio [ Leonard Jan 16, 2017 ]
The PAC controller i ordered is causing noise in the factory sub [ Nick Dec 09, 2016 ]
I want to see if it actually works, im picking up a lot of alternator noise through my headunit, ive done everything from running all new grounds, using high shield RCA cables, checked the impedance between my headunit and amp, ive gone through everything I can and as a last resort im purchasing this to see if it will eliminate the alternator noise im hearing. [ Caleb Oct 02, 2016 ]
noise reduction in a HD Road Glide after market radio and amp [ Kevin Sep 23, 2016 ]
Works great. Clean sound. Easy to connect. Must reconnect every time it does not automatically connect when powered on. [ EDWARD H Sep 22, 2016 ]
I needed a ground fault eliminator and I wanted to buy it from Crutchfield. [ Scott Sep 12, 2016 ]
A Crutchfield expert recommended me this to end with my rainy static noise. [ Javier Sep 08, 2016 ]
Function [ ROBERT Sep 07, 2016 ]
Eliminate any possible whine or pop sound in the speakers [ Dale Aug 03, 2016 ]
PAC's reputation and Crutchfield's great customer support [ JESUS G Jul 16, 2016 ]
Good reveiws [ PHILLIP Jul 13, 2016 ]
I like the insallation method, and reviews [ PHILLIP Jun 15, 2016 ]
I have popping sound in my speakers when switching sources, on/off, changing tracks on cd's, etc. after new stereo installation. All research points to this item which has great reviews for stopping this type of noise due to a ground loop problem. After triple checking, all ground wires are properly connected. From what I have read harnesses that change regular wiring to RCA type connectors for the speakers/sub connection to the new head unit can cause this. [ Tim Apr 21, 2016 ]
I have alternator whine and the PAC will help alleviate this problem. [ Willard C. Apr 10, 2016 ]
Needed because there is noise in the radio. [ Corlett Apr 08, 2016 ]
the best I found also Crutchfield are great to deal with [ Gary Apr 05, 2016 ]
its the only thing you had to do the job i need [ denis Feb 27, 2016 ]
Used this to cancel any potential electrical noise from the chassis grounds. [ Josh S Feb 04, 2016 ]
i have used this product in earlier installation and it did the job. works great cured the problem I recommend it for any feed back noise [ NICHOLAS A Jan 09, 2016 ]
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11 questions already asked

will this stop alternator hum?
[ Tate Mar 24, 2019 ]
Yes. Had a terrible hum in my boat, and the Crutchfield advisor recommended this for me. I was skeptical, but man, did it do the trick!
This helped mine, it does slightly lower overall volume but compared to the hum it was a very acceptable trade off.
This says it works in the range of 20hz-to 20khz..is this going to limit my input then output to my speakers which are rated to 40khz?
[ Andrew Oct 02, 2018 ]
Hello, Andrew! My understanding is that 20k is the high end of human hearing, I think the only one who will hear any difference is a dog...:o) ! This part works great, sounds great.Steve
Yes, it will limit the frequency, but your not going to be able to hear the frequencies that will be filtered out, most people only hear in that 20hz to 20khz range anyway.
How big is this filter? I need to filter my front and rear speakers (only filtered the front and am still getting engine whine from rear doors) but I am running out of space in the dash behind the radio! Are these small or do you have dimensions? What I am hoping is that these are smaller than average--if so I will get 2!
[ Bryant Jun 14, 2017 ]
They are about an 1 inch thick and about 1 1/2 long I got two to fit behind the head unit. Good luck.
i installed an aux to my xm radio and can hear alot of engine rpm noise will this fix it? and how would i install it?
[ Connor Oct 11, 2016 ]
it worked for me. i installed an after market radio and ended up with alternator whine. this installs between you head unit and the speakers. i put phono plugs on my left. and right speaker outputs and plugged into this unit..
can I hook the pac SNI ground loop to my equalizer rca jack instead of the head unit rca jack? would that matter?
[ Goldie Sep 29, 2016 ]
Yes, you can also plug the PAC SNI-1 into your equalizer's RCA output instead of the head unit if ground loop noise is occurring from the EQ. I hope that helps! My bio: http://www.crutchfield.com/Support/Bio.aspx?bio=159
How to stop these from killing the bass and all of the sound clarity from my speakers?
[ Joel Sep 14, 2016 ]
This product does not have any audio controls other than weather you connect the brown wires or not. You may want to look into sound processors to help restore the bass. Those are good about reducing the noise floor in the audio itself so they should help with that part too. I recommend calling an advisor on 1-800-324-9695 to discuss those products. HTH!My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=101

Audio Noise Filter Ground Loop Isolator

I'm using this with a Bose sound system equipped with a Kicx KAP-29 amplifier. The role of this additional amp is this system is to have a more kicking bass in the trunk. The main problem was the start/stop popping noise which has been eliminated by this stuff. But i'm suffering from a considerable level drop in bass after installing this. What could cause this problem and in which cases do i have to use grounding wire on it? Radioshack audio system ground loop isolator (electrical hum noise reducer)
[ Tamas Mar 11, 2016 ]
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the 'My Orders' tab in the 'My Account' section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
I had two of these from metra which each had two grounds coming off of it. I use it for the popping noise which is created when my amp turns on from replacing the stereo in my saab 9-5 with the 9 speaker system. However, after a few months of use the speakers always start to have a buzzing noise coming from them, which gets worse and worse. The buzzing isn't constant, however, it picks and chooses when it wants to. about 60% of the time. Is this one of better quality and will not cause that to happen?
[ Patrick Mar 09, 2016 ]
Since we don't carry the Metra noise filter you're referring to, there's no way to know if this PAC noise filter would work better, worse or the same. However if you wanted to try this one out, keep in mind our 60-day money back guarantee that we include with every purchase. You can find more details about our return policy on our site here: http://www.crutchfield.com/support/returns.aspxI hope that helps. My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=159
Will sound quality be affected?
[ Calvis Dec 14, 2015 ]
When installed properly, no; not negatively anyway. Sound quality should only improve once the ground loop noise is eliminated.Hope that helps!

Ground Loop Isolator Laptop

Will this thing address loud popping sound heard from all speakers under the following conditions?1. changing of audio source2. changing volume from 1 to 0 or 0 to13. forward from one song/folder to next (both in CD and USB)4. powering HD on and off5. seeking up or down FM stations
[ Tony May 03, 2015 ]
I forwarded your question to an Advisor and they responded with the following: The PAC SNI-1 will eliminate interference and noise of all kinds that is created from a ground loop problem. If you are running an amplifier or amplifiers then this is the best solution in most cases for eliminating the noises that you have mentioned. Some cars with factory amps, like Mustangs for example need a 12V to 5V converter instead.If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat.

1 4 Ground Loop Isolator

If I have two sets of pre amps, can I use only one of these? Thanks for any info. Jon
[ Jonathan Mar 17, 2015 ]
I have a monoblock running my 12 and a 4channel running my door and rear deck I started by unplugging the RCAs from the amp to see which pair would eliminate the sound once I found it installed only one and all noise was gone hope this helps I know it helped me

Stereo Audio Ground-loop Isolator & Filter With 3.5mm Connectors

No you need two.
Sorry, I just realized what this was. You need one for each amp. In my case, the amp would sense no signal when I changed channels and would turn off. Then when the stereo started playing the new channel it would turn back on. Huge noise problem changing channels. This filter delays the the signal from disappearing so the amp doesn't turn off and you will want one for each amp. So yes, each amp needs it's own filter. Worth the money!
I had only one amp for two sub speakers. I would think you would need one for each amp with a red/white right/left for each amp But you could split it as a low input. My setup was for rear bass only. You may be able to use only one as a low input to two subs. I would refer to the wire diagram that came with your equipment.
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