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In Reply to: Re: Should I remove the passive filtering I have posted by benie on April 22, 2007 at 03:09:53:
Yep...take em' out. The 193L doesn't work well with the Auri .47uf across the line...matter of fact take them out of everything you modded with the Auri's...parallel filters no matter where they are located on the line talk to one another...and sometimes the ringing harmonic reaction is really bad. I have had a hard time finding parallel filtering that works well with the choke...but after playing around for a few months I came up with a design that works fantastic. E-mail me for more info if interested.
Follow Ups:
Does this mean that I would need to remove all the Quietlines I have throughout my house if I installed a choke at my system outlet?
Thanks for any advice
Chris
Quiet Lines or R-C filters dampen AC circuit resonances. If they made an improvement in your sound when you installed them, then removing them will undo the damping benefit they provide at those locations.The Hammond choke is an alternative way of dissipating RF noise. The steel core in the choke is similar to the steel core in a transformer. The core has magnetic domains that have to switch direction in response to current changes in the windings. The domains can only do this so fast, and ignore changes that go too fast for them. Thus, every transformer with a steel core has an upper limit to its frequency response. The input coil will look like a resistor for much higher frequencies, whether the device is a transformer or a choke.
At sufficiently high frequencies, the noise will see only the coil's wire resistance, not the inductance (ignoring second-order effects like stray inductance and capacitance). Thus, there will be an optimum-size choke, with a DC coil resistance that dissipates the noise instead of reflecting it. Chokes that are too small or too large will reflect more of the noise. This is similar in concept to selecting the correct resistance value for an R-C filter.
Try installing your choke tweak at your audio system. I suggest replacing your floor outlet with a duplex outlet such as the Oyaide Ultimo SWO-GX+, so that you have the extra outlet to use for the choke. A three-way tap will harm your system performance so much that you may not be able to judge the benefit of the choke.
Once you are used to the sound with the choke in place, try unplugging the Quiet Lines or R-C filters, one at a time, and listen carefully. If the capacitors are interacting with the choke, the sound will improve. However, I expect the resistors in series with the caps will keep this from happening, and that you will have added benefit from the choke and the R-C filters.
The choke resistance above the core's maximum frequency will be determined by the skin effect and the coil wire diameter. The DC resistance will be lower than the effective Ohmic resistance at the relevant noise frequencies.
What happens if short lead is hooked to hot & long lead to neutral..? I have my 193L in my DAC for almost a year & can't remeber which way I put it..? mmmgot me thinkin now..
Nothing...not a thing. I just prefer the longer lead for the hot...that's all.
I was hoping that was so,
Thanks.
Have you stepped up to the 193M yet? If not, you should check it out...excellent midrange detail and shading.
I was about to order the 193L when I read this post. Alan, do you men that 193M is better and a step up from 193L? Just want to know which is the better one before I place my order. Thanks again.
Yes the 193M is a step up from the 193L. They both sound the same, but the 193M is equaly to the performance of two 193L's...that's all. I use both models in my system. The 193L for outlet isolation, and a pair of 193M's for overall filtering.
No not yet, I will give it a try though. I think I will pull all my Auri's & give a listen.. I got em everywhere.
Yank away....the Auri's are killing the choke's sound quality.
Hi Al
Thanks for the helpful advice. Would it create a big sound degradation to use a hospital grade male AC plug, run two 14 gauge 3-conductor power cords into this one plug, then attach a separate contractor's grade female 3-slot AC plug to each of these cords at the other end and plug this into my single outlet, at least for starters, keeping the whole assembly to only a few inches in length?
Thanks so much,
Chris
This kind of thing is OK for experiments, but the extra contacts involved all degrade the performance for serious listening.It is likely that your single-outlet fixture is not very good for audio. The Japanese have been making a lot of progress recently in improving the USA-type outlets for audio. Even if you had to mount a box above the floor to accommodate a duplex outlet, it would be worth the inconvenience to get better outlet performance.
Start with the same experiment, and then move on to the other circuits on the same electrical phase.
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