--- product_id: 3459241 title: "BOSS Audio Systems B25N Noise Filter for Car Sound Systems - Ground Loop Isolator for Crossover Stereo Equalizer Amplifier Subwoofer" brand: "boss audio systems" price: "188.15 DT" currency: TND in_stock: true reviews_count: 13 category: "Boss Audio Systems" url: https://www.desertcart.tn/products/3459241-boss-audio-systems-b25n-noise-filter-for-car-sound-systems store_origin: TN region: Tunisia --- # Compact 3.4x1.5x1.5 inch design Eliminates high-pitched alternator whine Ground loop isolator tech BOSS Audio Systems B25N Noise Filter for Car Sound Systems - Ground Loop Isolator for Crossover Stereo Equalizer Amplifier Subwoofer **Brand:** boss audio systems **Price:** 188.15 DT **Availability:** ✅ In Stock ## Summary > 🔊 Clear your ride’s soundtrack—silence the noise, amplify the vibe! ## Quick Answers - **What is this?** BOSS Audio Systems B25N Noise Filter for Car Sound Systems - Ground Loop Isolator for Crossover Stereo Equalizer Amplifier Subwoofer by boss audio systems - **How much does it cost?** 188.15 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/3459241-boss-audio-systems-b25n-noise-filter-for-car-sound-systems) ## Best For - boss audio systems enthusiasts ## Why This Product - Trusted boss audio systems brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Silence the Static:** Eradicates annoying alternator and electrical noise for crystal-clear sound. - • **Audiophile-Approved:** Preserves full audio fidelity with zero signal loss—hear every detail. - • **Drive with Confidence:** Trusted by car audio pros and home enthusiasts alike to banish buzz and hum. - • **Plug & Play Simplicity:** Compact, lightweight design installs in minutes—no tech headaches required. - • **Universal Compatibility:** Works seamlessly with crossovers, equalizers, amplifiers, and subwoofers. ## Overview The BOSS Audio Systems B25N Noise Filter is a compact ground loop isolator designed to eliminate high-pitched alternator whine and electrical interference in car audio setups. Compatible with crossovers, equalizers, amplifiers, and subwoofers, it ensures pristine sound quality without signal loss. Lightweight and easy to install, this device is a must-have for audiophiles and professionals seeking flawless in-car audio performance. ## Description Product description Noise Filters Noise Filter for Car Audio Systems - Ground Loop Isolator B25N Features Review: Listening to music is probably my favorite hobby. I went through three different home built ... - Listening to music is probably my favorite hobby. I went through three different home built PC's (have been building my own systems for a while now) to get rid of noise emanating from these builds i.e. Home entertainment PC based systems. This little box cleared up the noise completely. It does exactly what is was designed to do, i.e. get rid of input noise. For more details read on. I'm a PC enthusiast with audiophile taste but not their pocket. My previous system was an Amd FX-6350 CPU and a Sound Blaster X-Fi Platinum sound card for a 5.1 sound system. Two power amplifiers and 15" and 12" speakers for sub's and front and other smaller speakers for rear and centre. My FX-6350 System had no noise problems but I was dissatisfied with it's performance. I messed up my system striving to extract more performance from it. The system froze during a bios upgrade ending my MOBO's life hence the need for my new build, an FX-9590 PC. I went for an upgrade of my sound card as well. The first new system an AMD FX-9590 with a sabertooth 990fx and an upgraded Soundblaster Z sound card was working well with the exception of noise coming from the sub-woofers and to a lesser degree from the front full range speakers connected to the pyramid PA-1800X and PA-800X power amplifiers respectively. The whining static like in and out white noise morhed with a high pitched sound of a few kilohertz was unbearable especially since my new sound card was rated @ 116db S/N ratio. I tried a different power supply and video card which helped a little but the noise was still there. Bought another MOBO but the thermals of that board was too low for my new 220w tpd processor, but worked well my FX-6350. I then sold the first MOBO the sabertooth 990fx which locked up on the boot screen. I thus gave up the second MOBO which according to my research had a few successful builds with a FX9590 CPU. I sold it along with the FX-6350. I'm now down three MOBO's I have a powerful new CPU and no working system. I then purchase my final MOBO a Crosshair V formula Z and guess what the noise is back. I researched the problem on-line and tried sheilding the sound card with foil and cardboard - no significant difference. With my MOBO bios one could save various bios setting profiles, so I underclocked the machine significantly from 5.0ghz to 1.5 or 1.8 ghz. It helped but noise was still there but more tolerable but the machine's performance was significantly diminished.. Frustrated with performance I went back up in clock speed and turned off two of the eight cores, it helped but not enough. I was convinced that the problem was processor based I had no intentions of buying another MOBO. SInce Sub-woofer output is mono I used two ten band equalizers in series i.e. channel into channel and then equalizer into equalizer and attenuated everything from 300 hz and above. total attenuation 12db per channel times 4 - 48db this yielded the largest reduction in noise and I used this system for a while but in a quiet room, anyone with a keen ear could still hear the faint noise. While searching for a better solution on-line I came across a number of possible solutions and one of them took me to a device similar to this one on desertcart. I reviewed the specs and especially the reviews of devices similar to this one and despite a few negative reviews after careful consideration I decided on this one. That is a decision I will not regret. My noise problem persisted for several months and could be detected in a room from a distance of twenty feet or more feet even with the volume muted on my PC. I tried a number of possible solutions which had limited to no success at all. I went through three different motherboard at a cost of a couple hundred dollars and guess what the solution was this device available right there on desertcart for less than 10 bucks. I highly recommend this product it works. I experienced no audible signal loss as some reviewers claimed but I did experience full noise loss. I think it was designed for car audio but it certainly works for home audio. Now I can put my ear to the grill of my 15's and hear no noise whatsoever with the PC soundcard volume at one hundred percent while nothing is playing. Thanks Boss audio for a great product. Review: TEN STARS!!! - TEN STARS! TWENTY STARS! PERFECT FOR STUDIO USE! This comes from a professional audio engineer and music producer. Read on so you understand the miraculous level of goodness this little thing packs for $8 To give you an idea of the level of noise I was getting in my headphones, I have a 10 USB port hub, with a Roland Quad Capture, a Kaoss Pad, an Arturia Microbrute (ANALOG synth), Panorama P4 MIDI Controller (takes two USB ports), a Mininova, my typing keyboard, my mouse, and outside of the hub on the three remaining ports, an external hard drive, a laptop cooling pad and a Pioneer DJ Controller. Since my soundcard as amazing as it is only has two inputs, I have the Microbrute routed through the Mininova (unbalanced), the Mininova routed through the Kaoss Pad (unbalanced), and the output of the Kaoss Pad (unbalanced) to the two inputs of the soundcard for stereo. All three connected via USB with the rest of the stuff. Needless to say, the amount of hum I was getting was insane to the point I desisted from recording anything for a bit and stuck to soft synths, leaving the hardware for ornamental purposes and your occasional sound I had to filter the hell out of. I bought two of these BOSS things because I thought I could need more, and had all sorts of premium TRS cables, stereo DI Boxes and what have you saved for later on my cart, ready to buy them in case this didn't work, but since it was $8 I thought it wouldn't hurt to try. In short: with all that mess, ALL I DID WAS PLUG IT TO THE KAOSS PAD OUTPUT AND ALL THE HUM IS GONE. ALL OF IT. I even turned up all of the volume input and output knobs just to see if there was anything left. Nothing. Just pure, beautiful, analog hiss. No hum. Nothing. This thing saved me hundreds of dollars in USB filters, hum filters and cables, and all I've got is a bunch of cheap RCAs because all outputs and inputs between these synths are unbalanced. Also, don't fall for the RCA marketing hype. No matter how cool an RCA cable looks, granted some will last more than others, but all of them produce considerable noise. Thank you BOSS for such an amazing product! P.S. Just so you know, I didn't care, but maybe some of you would be concerned because the casing is not made of metal as it appears to be. It's plastic. But that was not a problem for me. Not sure how it would work in a car though. ## Features - Reduces High Pitched Whine Alternator Noise caused by the car's electrical system - Ground Loop Isolator Noise Filter - Always Use High Quality RCA Cables for your Audio System - Dimensions: 3.4 x 1.5 x 1.5, Unit Weight: .30 Lbs. Tips: Ground each amplifier independently. Same thing if you have added stiffening capacitors, go to a separate ground for the cap ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000LP4RMG | | Best Sellers Rank | #15 in Car Amplifier Noise Filters | | Brand | BOSS Audio Systems | | Brand Name | BOSS Audio Systems | | Customer Reviews | 3.8 out of 5 stars 2,645 Reviews | | Global Trade Identification Number | 00791489170055 | | Included Components | BOSS Audio Systems Ground Loop Isolator B25N noise Filter for Car Audio Systems | | Item Dimensions | 3.38 x 1.5 x 1.5 inches | | Item Weight | 0.25 Pounds | | Item dimensions L x W x H | 3.38 x 1.5 x 1.5 inches | | Manufacturer | BOSS Audio Systems | | Material Type | Metal, Plastic | | Model | B25N | | Mounting Type | Surface Mount | | Number of Channels | 2 | | Package Type Name | Standard_packaging | | Part Number | B25N | | UPC | 809187135679 163121368371 809386486756 019372806240 132018222775 804066817783 791489170055 807031767632 115971573498 808112581604 808112397250 978654254783 | | Unit Count | 1.0 Count | | Warranty Description | 3 Year Warranty | ## Product Details - **Brand:** BOSS Audio Systems - **Item dimensions L x W x H:** 3.38 x 1.5 x 1.5 inches - **Manufacturer:** BOSS Audio Systems - **Mounting Type:** Surface Mount - **Number of Channels:** 2 ## Images ![BOSS Audio Systems B25N Noise Filter for Car Sound Systems - Ground Loop Isolator for Crossover Stereo Equalizer Amplifier Subwoofer - Image 1](https://m.media-amazon.com/images/I/61TchapzvSL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: can someone explane to me what this does as if i were a complete idiot?** A: The ground isolator removes ground noise caused by other components in the power system of your audio devices, it does this by decoupling the amplifier from the audio source directly, wires wrapped around in a transformer allow the audio signal to pass through induction but leave the ground isolated. So any noise on the ground line is not sent to the audio input of the amplifier. **Q: Can I insert this filter between my power amp and preamp in my home audio system to fix the hum problem?** A: Your hum problem is likely between your preamp and one of its inputs. Disconnect each in turn to see which is the problem. Use this there. It breaks the earth loop. If you put it between the pre and power amp, the hum is already in the audio signal, so it would not be effective at that point. **Q: Will this eliminate the buzz between my record player and receiver?** A: You can usually eliminate hum between your record player and your phono stage input by grounding the two devices together with a dedicated wire, usually built-in to the record player, which attaches to a stud on the phono preamp or stereo. Hope this helps. **Q: Will this work for a CB radio?** A: sure, it filters out noise from the power wire ## Customer Reviews ### ⭐⭐⭐⭐⭐ Listening to music is probably my favorite hobby. I went through three different home built ... *by W***E on August 8, 2016* Listening to music is probably my favorite hobby. I went through three different home built PC's (have been building my own systems for a while now) to get rid of noise emanating from these builds i.e. Home entertainment PC based systems. This little box cleared up the noise completely. It does exactly what is was designed to do, i.e. get rid of input noise. For more details read on. I'm a PC enthusiast with audiophile taste but not their pocket. My previous system was an Amd FX-6350 CPU and a Sound Blaster X-Fi Platinum sound card for a 5.1 sound system. Two power amplifiers and 15" and 12" speakers for sub's and front and other smaller speakers for rear and centre. My FX-6350 System had no noise problems but I was dissatisfied with it's performance. I messed up my system striving to extract more performance from it. The system froze during a bios upgrade ending my MOBO's life hence the need for my new build, an FX-9590 PC. I went for an upgrade of my sound card as well. The first new system an AMD FX-9590 with a sabertooth 990fx and an upgraded Soundblaster Z sound card was working well with the exception of noise coming from the sub-woofers and to a lesser degree from the front full range speakers connected to the pyramid PA-1800X and PA-800X power amplifiers respectively. The whining static like in and out white noise morhed with a high pitched sound of a few kilohertz was unbearable especially since my new sound card was rated @ 116db S/N ratio. I tried a different power supply and video card which helped a little but the noise was still there. Bought another MOBO but the thermals of that board was too low for my new 220w tpd processor, but worked well my FX-6350. I then sold the first MOBO the sabertooth 990fx which locked up on the boot screen. I thus gave up the second MOBO which according to my research had a few successful builds with a FX9590 CPU. I sold it along with the FX-6350. I'm now down three MOBO's I have a powerful new CPU and no working system. I then purchase my final MOBO a Crosshair V formula Z and guess what the noise is back. I researched the problem on-line and tried sheilding the sound card with foil and cardboard - no significant difference. With my MOBO bios one could save various bios setting profiles, so I underclocked the machine significantly from 5.0ghz to 1.5 or 1.8 ghz. It helped but noise was still there but more tolerable but the machine's performance was significantly diminished.. Frustrated with performance I went back up in clock speed and turned off two of the eight cores, it helped but not enough. I was convinced that the problem was processor based I had no intentions of buying another MOBO. SInce Sub-woofer output is mono I used two ten band equalizers in series i.e. channel into channel and then equalizer into equalizer and attenuated everything from 300 hz and above. total attenuation 12db per channel times 4 - 48db this yielded the largest reduction in noise and I used this system for a while but in a quiet room, anyone with a keen ear could still hear the faint noise. While searching for a better solution on-line I came across a number of possible solutions and one of them took me to a device similar to this one on amazon. I reviewed the specs and especially the reviews of devices similar to this one and despite a few negative reviews after careful consideration I decided on this one. That is a decision I will not regret. My noise problem persisted for several months and could be detected in a room from a distance of twenty feet or more feet even with the volume muted on my PC. I tried a number of possible solutions which had limited to no success at all. I went through three different motherboard at a cost of a couple hundred dollars and guess what the solution was this device available right there on Amazon for less than 10 bucks. I highly recommend this product it works. I experienced no audible signal loss as some reviewers claimed but I did experience full noise loss. I think it was designed for car audio but it certainly works for home audio. Now I can put my ear to the grill of my 15's and hear no noise whatsoever with the PC soundcard volume at one hundred percent while nothing is playing. Thanks Boss audio for a great product. ### ⭐⭐⭐⭐⭐ TEN STARS!!! *by F***. on November 13, 2015* TEN STARS! TWENTY STARS! PERFECT FOR STUDIO USE! This comes from a professional audio engineer and music producer. Read on so you understand the miraculous level of goodness this little thing packs for $8 To give you an idea of the level of noise I was getting in my headphones, I have a 10 USB port hub, with a Roland Quad Capture, a Kaoss Pad, an Arturia Microbrute (ANALOG synth), Panorama P4 MIDI Controller (takes two USB ports), a Mininova, my typing keyboard, my mouse, and outside of the hub on the three remaining ports, an external hard drive, a laptop cooling pad and a Pioneer DJ Controller. Since my soundcard as amazing as it is only has two inputs, I have the Microbrute routed through the Mininova (unbalanced), the Mininova routed through the Kaoss Pad (unbalanced), and the output of the Kaoss Pad (unbalanced) to the two inputs of the soundcard for stereo. All three connected via USB with the rest of the stuff. Needless to say, the amount of hum I was getting was insane to the point I desisted from recording anything for a bit and stuck to soft synths, leaving the hardware for ornamental purposes and your occasional sound I had to filter the hell out of. I bought two of these BOSS things because I thought I could need more, and had all sorts of premium TRS cables, stereo DI Boxes and what have you saved for later on my cart, ready to buy them in case this didn't work, but since it was $8 I thought it wouldn't hurt to try. In short: with all that mess, ALL I DID WAS PLUG IT TO THE KAOSS PAD OUTPUT AND ALL THE HUM IS GONE. ALL OF IT. I even turned up all of the volume input and output knobs just to see if there was anything left. Nothing. Just pure, beautiful, analog hiss. No hum. Nothing. This thing saved me hundreds of dollars in USB filters, hum filters and cables, and all I've got is a bunch of cheap RCAs because all outputs and inputs between these synths are unbalanced. Also, don't fall for the RCA marketing hype. No matter how cool an RCA cable looks, granted some will last more than others, but all of them produce considerable noise. Thank you BOSS for such an amazing product! P.S. Just so you know, I didn't care, but maybe some of you would be concerned because the casing is not made of metal as it appears to be. It's plastic. But that was not a problem for me. Not sure how it would work in a car though. ### ⭐ Shorted wire or something *by T***I on May 4, 2013* Purchased to connect between Desktop and Mixing console to eliminate ground loop hum during occasional video playback. I did appear to cut out the hum. However it also cut out most of the middle frequencies as well. I was left with extremely deep reverb effect without the original sound, leaving almost no clear vocals or mid range sound. I found while moving the wires this would change somewhat. So, I will consider trying to replace with another one just to give them a second chance. Partially my fault for trying to take the cheap route. -Would like to compliment Amazon Customer service though as I contacted them and they immediately sent a new one out at no charge. Will wait to receive that before commenting on replacement product performance. Update: First, Amazon told me on the phone they would send me a new one to just toss the old one and don't worry about sending it back. Then I received an email telling me I must return it or be charged for it and the replacement. Second, the replacement arrived and upon connection it had the same reverb effect sound cutting out most of the vocals and mid range frequencies. However, no amount of wiggling the wires or checking the connection contact made a difference with this one. -Update: Amazon had completely refunded the purchase to me and has stated that they will check into these problems with the manufacturer. ## Frequently Bought Together - BOSS Audio Systems Ground Loop Isolator B25N noise Filter for Car Audio Systems - DteeDck RCA Splitter 1 Female to 2 Male, 2 Pack - RCA Audio Video Cable Splitter Adapter, Dark Blue - Monoprice 1.5ft Premium 2 RCA Plug/2 RCA Plug M/M 22AWG Cable - Black --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/3459241-boss-audio-systems-b25n-noise-filter-for-car-sound-systems](https://www.desertcart.tn/products/3459241-boss-audio-systems-b25n-noise-filter-for-car-sound-systems) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-15*