--- product_id: 3459241 title: "BOSS Audio Systems B25N Car Sound Noise Filter, Ground Loop Isolator" brand: "boss audio systems" price: "HK$353" currency: HKD in_stock: true category: "Boss Audio Systems" url: https://www.desertcart.hk/products/3459241-boss-audio-systems-b25n-car-sound-noise-filter-ground-loop store_origin: HK region: Hong Kong --- # Compact 3.4x1.5x1.5 inch design Eliminates high-pitched alternator whine Ground loop isolator for clean signal BOSS Audio Systems B25N Car Sound Noise Filter, Ground Loop Isolator **Brand:** boss audio systems **Price:** HK$353 **Availability:** ✅ In Stock ## Summary > 🎧 Clear sound, zero noise—because your music deserves the spotlight. ## Quick Answers - **What is this?** BOSS Audio Systems B25N Car Sound Noise Filter, Ground Loop Isolator by boss audio systems - **How much does it cost?** HK$353 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/3459241-boss-audio-systems-b25n-car-sound-noise-filter-ground-loop) ## 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 - • **Multi-Use Magic:** Perfect for car audio or home studio setups—your secret weapon against hum and buzz. - • **Plug & Play Peace:** Effortless installation with universal RCA compatibility—no tech degree required. - • **Compact Powerhouse:** Small footprint fits anywhere, delivering big noise reduction without bulk. - • **Silence the Static:** Say goodbye to that annoying alternator whine ruining your drive or studio session. - • **Audiophile Approved:** Trusted by pros and enthusiasts alike to preserve pure sound clarity. ## Overview The BOSS Audio Systems B25N Noise Filter is a compact ground loop isolator designed to eliminate high-pitched alternator noise and electrical hum from car audio systems and home setups. Featuring a durable build and easy RCA connectivity, it ensures crystal-clear sound by isolating and filtering unwanted interference, backed by a 3-year warranty and trusted by both audiophiles and professionals. ## Description desertcart.com: BOSS Audio Systems B25N Car Sound Noise Filter, Ground Loop Isolator : Electronics ## 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 Name | BOSS Audio Systems | | Customer Reviews | 3.8 3.8 out of 5 stars (2,657) | | 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 | 4 ounces | | 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 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 Car Sound Noise Filter, Ground Loop Isolator - Image 1](https://m.media-amazon.com/images/I/61TchapzvSL.jpg) ![BOSS Audio Systems B25N Car Sound Noise Filter, Ground Loop Isolator - Image 2](https://m.media-amazon.com/images/I/61c+qWyURVL.jpg) ![BOSS Audio Systems B25N Car Sound Noise Filter, Ground Loop Isolator - Image 3](https://m.media-amazon.com/images/I/61zglGUTucL.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 ## 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.hk/products/3459241-boss-audio-systems-b25n-car-sound-noise-filter-ground-loop](https://www.desertcart.hk/products/3459241-boss-audio-systems-b25n-car-sound-noise-filter-ground-loop) --- *Product available on Desertcart Hong Kong* *Store origin: HK* *Last updated: 2026-08-02*