Using Rochelle salt to absorb EMI from your homes AC line to supercharge your audio system performance
For ones that have been following this thread and have tried any of the tweaks, cable mods or DIY Ground Box knows how effective they are. This entire thread is devoted to "
lowering noise" within an audio system to "
hear more". With the obvious goal of improving the sonic capabilities of our audio systems. Well, I have found a way to systematically lower the EMI noise in our home AC wiring. I will share in this post what the tweak is, how to apply the tweak, and how to tune your system with the tweak.
This tweak is a doozy, the potential sonic performance upgrade is astounding. I can easily say that the tweak is a AC line upgrade. And absolutely the lowest effort, lowest cost to highest performance tweak I have experienced in 25+ years in this hobby. The cost is about $20 or less to treat your entire home! I do not believe there is a retail offering or solution that accomplishes what this tweak does, so it is DIY only. Also, as presented is for US home wiring. If your part of the world has different junction points, you will have to use the concepts shared here and apply to your wiring.
What does the tweak do?
It is apparent after a lot of experimenting, our AC home wiring is acting like an antenna for EMI from airborne and appliances. Even AC wiring from circuits other than the one powering our audio systems effect the circuit powering the audio system. Noise is likely transferred at the main breaker junction. The tweak absorbs EMI systematically at AC line junctions we can easily access. By doing this I can easily and immediately hear the effect on my system. I have treated 28 such junctions within a 1100 square foot apartment. Would have been interesting to do this in my previous 3600 square foot home. Every junction treated causes a slightly different effect. Also gives an opportunity to tune which I will get into soon.
The performance increase I received by installing across the 28 junctions in my residence:
* increased speed and impact of macro and micro dynamics
* increased ultra fine micro detail retrieval across the entire note or sounds being heard. This is across the whole note or sound(s) from attack to decay and effects the entire frequency spectrum.
* Blacker/quieter background
* improves timbre, probably because of the first two benefits noted above
* separation and space within the sound stage is also improved
* Bass slam and bass detail retrieval of ultra fine detail is improved. Bass performance was already very good, now it is better!
What is the tweak and how to apply the Tweak?
Before getting into the tweak, let me share that I like a warmish, dynamic and lush presentation. I am sensitive to tonal imbalance, peaky and sharp or weird high frequencies. Take this in consideration when tuning. You may want a more spicy top end or not as weighty mid bass or less body, or less bass slam in the presentation. The amount or weight of the Rochelle salt I am going to recommend as a starting point, is for my taste and system setup. The tuning section will explain how to tune to your tastes.
We are going to use Rochelle salt to absorb EMI from every AC outlet and light switch junction in the house. You can also use the Rochelle salt to absorb EMI at the breaker panel which I will address in the tuning section. We want to filter the Hot line and at the ground. Leave the Neutral side alone. You could try also on Neutral but all my tests show there are negatives filtering the Neutral line. We are going to make what I call Rochelle mini wraps. Which is simply Rochelle salt in a small plastic zip lock baggy. I will post links for the Rochelle salt I use and where I get the baggies I use.
You "will not" be touching any electrical wiring. You will only be removing the cover plate for the AC outlet or light switch. The Rochelle mini wraps are affixed to the actual wall cover plates with masking tape and then re-installed. That is it, as easy as that. The cover plate will wedge the rolled up baggy to the wall, it is not going anywhere.
Also note, Rochelle salt "is not" conductive. The amount of Rochelle salt you want to use for the Hot line is 1 gram. Amount used for the ground is 0.5 grams. Do not let that small amount of Rochelle salt fool you, it is very potent within this application. You will understand once you start installing these wraps. I use a plastic spoon for scooping the small amount of Rochelle salt into the little baggies. My favorite mineral measuring tool, LOL. But I do weigh for this application. Not critical to weigh but helps for tuning.
* Hot line filtering - 1 gram in a 6.2cm x 8cm zip lock baggy
* Earth Ground filtering - 0.5 gram in a 4cm x 5cm zip lock baggy
Tuning:
* After install, effects of the tweak is immediate. Takes a few hours only to fully settle in.
* Filtering just the Live line without filtering ground will offer a more active or livelier performance. If you want a spicier top end add a tad more Rochelle salt. Basically adding 0.2 - 1 more gram to tune. Just have a few different amounts in bags and you can easily just lift the cover, swap the amount and listen. No need to screw that cover in place to hear what it does, so long as it is in place.
* The 0.5 gram filtering the ground adds a better tonal balance. Warms up the presentation a bit compared to the Hot line being filtered by itself. Also improves bass slam and presentation weight. You obviously can also use less or more to tune. I just find 0.5 to be the sweet spot for me.
* If you look at the included pics. You will notice the pic that has a 2nd smaller baggie, that is the ground filtering. Not obvious but I am pointing at the ground on the outlet or switch. In the pic the baggie is installed vertically (up and down - outlet pic) where the ground is affixed to switch. You can also install the baggie horizontally (left to right - light switch pic) where the ground is affixed to outlet or switch. Installing vertically also slightly filters neutral and will produce less bass slam. Installing horizontally, only across ground will produce more body, bass slam and adds slight warmth to presentation. You can use this also to tune at the different junction points in your home.
* Filtering at wall panel. This is trial and error for placement and amount. In the pic the left baggie has 11 grams and the right baggie has 14 grams. The interesting thing is filtering across the AC line at junction points is more effective than at the breaker itself, go figure.
Where to buy the Rochelle salt and baggies I use:
From eBay, Rochelle salt by JSP:
https://www.ebay.com/sch/i.html?_fr...DIUM+TARTRATE+(+rochelle+salt)+1+lb&_osacat=0
Small plastic bags I purchased from Amazon:
https://www.amazon.com/gp/product/B0BK48CFF2/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1