BOSS Audio Systems B25N Noise Filter for Car Sound Systems, Ground Loop Isolator

Dorrough Enterprises
(4142)
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US $18.99
Condition:
New

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Free delivery - Arrives by Thanksgiving
Get it between Fri, Nov 14 and Thu, Nov 20 to 94104.
Located in: Tulsa, Oklahoma, United States
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Seller does not accept returns.
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eBay item number:277177910504
Last updated on Jun 26, 2025 17:16:40 PDTView all revisionsView all revisions

Item specifics

Condition
New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ...
Brand
BOSS Audio Systems
Type
Noise Filter
MPN
B25N
UPC
791489170055
Category

Item description from the seller

About this seller

Dorrough Enterprises

99.7% positive feedback•9.0K items sold

Joined May 2007
Usually responds within 24 hours
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Detailed seller ratings

Average for the last 12 months
Accurate description
4.9
Reasonable shipping cost
5.0
Shipping speed
5.0
Communication
5.0

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Product ratings and reviews

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4.2
96 product ratings
  • 65 users rated this 5 out of 5 stars
  • 11 users rated this 4 out of 5 stars
  • 5 users rated this 3 out of 5 stars
  • 6 users rated this 2 out of 5 stars
  • 9 users rated this 1 out of 5 stars

Easy to install

Easy to operate

Good value

Most relevant reviews

See all 71 reviews
  • by tbarb1345
    Aug 23, 2016Top favorable review

    Great Product

    My sound system sounded fine when the car was turned off, but when I started the car it would make this loud whining sound. If I revved the engine it would raise in pitch. I found out it was most likely being caused by noise from the alternator and that a noise suppressor could work. This was the cheapest one I could find and it matched the brand of the amp i bought so I said what the hell. I have to admit that I didnt believe it would work and I would end up still taking it to a shop. But I plugged it in and it worked like a charm. No noise at all! Great buy!

    Verified purchase: YesCondition: NewSold by: jb-tools

  • by WVnY4-QKT9S@Deleted
    Jan 28, 2016Top critical review

    Hooked item to same brand deck and had no difference, not happy with Boss nothing

    I hooked item up to same name brand cd tv deck, had no effect same engine noise, hum etc.

    Verified purchase: YesCondition: NewSold by: my_audio_empire

  • by wombatguy2789
    Jun 28, 2016

    Boss Audio Ground Loop Insulators

    I was having low "alternator whine" sounds coming out of my speakers with a 1600watt MOSFET installed in the trunk despite grounding both the MOSFET's to the chasis as well as the recievers ground. I plugged this in directly to the amp and the other end going to the reciver and I instantly the alternator noise was gone. I turn my speakers to the max as a stress test to see if there was much difference and clarity...and really....if there was any difference I sure couldn't tell but the fact of the matter it elimated that annoying buzzy alternator revving RPM sound and even the floor noise and everything sounds so much better. I especially like this because I mounted these in the trunk so they don't shake all over the place and stay put while driving.

    Verified purchase: YesCondition: NewSold by: jb-tools

  • by cellsandmore
    Feb 11, 2020

    Good buy

    Had whining and static coming through speakers from the alternator because of the 1,000 watt amp running my interior speakers. Connected the noise filter, and now it gone!! Only downside is it decreases music volume by a small percent but other than that it’s a great product if you have multiple subs and amps!!

    Verified purchase: YesCondition: NewSold by: jb-tools

  • by kev1mz
    Jul 15, 2017

    What a shame

    I bough a boss amp it was good then an 8 inch sub that works pretty good and then I got this worthless piece of plastic. I thought it was of good quality based on previous purchases but it's just plastic and the rcv attached to it had a bad connection and when it's close to ground the noise on the speakers is unbearable. Very dissapointed and will rethink future purchases from this brand now.

    Verified purchase: YesCondition: NewSold by: audiosavings

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