Blue Jeans Cable Audio Isolation Transformer/Ground Loop Hum Eliminator for Subwoofer or Full-Range Audio

I purchased a new powered subwoofer recently and hooked it to my existing receiver. When the receiver was powered on without audio content, and the subwoofer was in standby mode (no detectable audio content), the subwoofer was silent. And everything functioned well when playing music. However, when the receiver was turned off, and the subwoofer was in standby mode, it emitted an annoying hum. Various rearrangements of the power and audio cables failed to get rid of the hum. I also tried some alternative cables with the same result. When I removed the audio cable from the subwoofer, the hum went away. Various sources suggested this behavior was a symptom of a ground loop. I ordered a Blue Jeans Cable SWT1 which was delivered very quickly. I simply inserted it between the subwoofer and the receiver using quality audio cables with RCA-type connectors and the hum disappeared. I am not an audiophile, but I could not detect any adverse impact on the music played through the subwoofer. This product delivers when it comes to eliminating hum caused by ground loops. The device has the appearance of quality construction. The packaging also includes useful background information about various causes of hum, acknowledging that the SWT1 is designed specifically to eliminate hums from ground loops; but it will not necessarily eliminate hums from other sources. The packaging indicates the seller will take back the product and give you a refund if it does not solve your problem, so this eliminates risks to the buyer. Return labels are included and no return authorization is required. In terms of solving my problem, and the policy regarding returns, I give this product five stars.

I'm always skeptical of these kinds of products, and this one wasn't cheap, but I didn't want to buy one that was meant for a stereo signal and awkwardly only use half of the connections, and I certainly didn't want to buy a super cheap one that would just degrade the signal, so I found this, saw the reviews, saw the FANTASTIC return policy (if it doesn't work, you just return it, no questions asked... it COMES with a return shipping label in the package!), and bought it. When it arrived I recreated the hum conditions, nervously plugged it inline with my sub signal, and BOOM! No more hum! And there's absolutely 0 perceptible signal quality loss! This product PERFECTLY fixed my issue! Also, again, the return policy is fantastic and the included information sheet was incredibly informative! I don't write reviews often, but I just had to share how fantastic this whole product experience has been! Yay! No more hum when my CPU or GPU is under load! Woot!

I have a Dayton SPA500 amp that I've head for about 3 years. Recently I discovered that I had a C69 on PCB, a capacitor that was going bad. I replaced this with a new capacitor. This did help alleviate the humming from being all over the place. Then during my testing, I found out the hum went away on two occasions. 1) when the cable is unplugged from the LFE Direct port on the plate amp. 2) when the amp went idle. When the plate amp was active, the faint green would be bright green. Then I could turn the gain up and hear the 60 HZ cycle hum on the subwoofer speaker. It was also very apparent in some computer games. like Assassin's Creed III Remastered or Witcher 3. It was a constant hum that would not go away. I tried to turn up my subwoofer volume on the receiver and turn down the gain but it was a bandaid, not a fix. This device along with Blue Jeans LC-1 cable, This SWT1 module, MediaBridge 2FT RCA cable eliminated my hum completely. I even turned up my gain but I could not detect a thing. If your condition sounds like mine, I recommend this module. Best part is, I can't detect a different in the way it performs or sounds when bass is playing.

My subwoofer was generating lots of grinding static noise due to a poor power supply design on a home theater PC. Anytime the PC was connected by HDMI to the AVR, scratching/grinding noise. I tried all the standard tricks (all gadgets on the same outlet, Fiber HDMI cable, heavy duty short shielded RCA cable, etc.) to no avail. This little guy arrived, plugged it inline with the existing cheap RCA cable from the LFE output of the AVR to the sub input. PERFECT. No static/hum/grinding noise, just Boom-Boom. Sure, there's a huge markup on a few bucks worth of components, but totally worth it to avoid the frustration.

If you're unable to plug your subwoofer into the same outlet as the rest of your home theater system like I am, but your hum problem goes away if you do, chances are you have a ground loop hum that is likely to be solved using these isolation transformers. What's happening is a tiny amount of current is finding an alternative path back to ground through your speaker cable because the voltage at your subwoofer is not exactly the same as the voltage at your home theater system; due to the potential difference, a very small amount of current flows, and the amplifier in your subwoofer amplifies this as sound. Unfortunately if your subwoofer has three connections- one LFE and two Speaker level inputs- you probably need to isolate all three channels. In that case, you need three transformers. That gets expensive pretty quickly at a $50 price-point, though it's also the case that transformers which work at frequencies down to 20 Hz are a bit of a specialty item, thus the cost. Incidentally, if you DO need to isolate speaker connections, get yourself a pack of these RCA/phono to gated screw terminal adapters: https://www.amazon.com/gp/product/B01C5YGXB8 . The specs on these transformers allow for an input signal of up to about 12v, which is pretty dang loud; they should be able to handle most home theater applications that require speaker-level isolation. These solved my problem, though after about 4 months, one of them started decoding AM broadcast signals unexpectedly, which unfortunately is a thing that can happen if you have a nearby AM station and some component in the unit starts behaving like a diode- this can be a bad solder joint, a capacitor that goes bad, or even a bad winding in the transformer. I haven't tried to solve the problem any further; simply swapping the transformer made the problem go away, but if I'm feeling adventurous, I might try to peek inside and see what exactly went wrong. I'm giving 4 stars instead of 5 because of the high price point and because I had one go bad after just 4 months. Of the ones that work, however, they work very well and solved a vexing problem for me.

I have been using Blue Jeans shielded sub cable since 2008ish. It resolved a hum issue back then. Now I'm in a new house, new sub, new system. When my computer would pull a lot of current while gaming, my sub started humming in time to the frame rate the video card was outputting at. After eliminating any chance it was EMI into the cable, I started thinking ground loop since the AV receiver and the computer/sub are on different circuits. I read through the information over on Blue Jeans webpage, and ordered the Audio Isolation Transformer. It solved the issue! No more ground loop interference! I just finished putting the sub through testing and it is responding properly, just without the hum! Blue Jeans even included a return envelope just in case ground loop wasn't my issue. Great company, great product. If you suspect you have a ground loop hum on your sub or other speakers, try this product. If ground loop is actually your problem, this will fix it.

This is some kind of filter NOT a isolation transformer! Removed all the bass. Has loose connection in it, it kept going in and out of bass. Yes I have very good cables! Going to try another. This is very expensive for not working properly! Would never buy from Blue Jeans again!

I got this thinking my problems are solved due to all of the great reviews. Unfortunately it did not work for my subwoofer. I plugged it in, reversed it, played with the settings on the subwoofer itself, played with the settings in the receiver..... Still humming. At this point I do not know if it is something internally wrong with the subwoofer or if this thing does not work but It didn't work for me.

solved 90% of the buzzing so it's tolerable now. Nice quick solution

I had higher hopes for this product. It does reduce some low end hum noise, but I still get a fair bit when the system shuts down.