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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Proceed with care.

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.

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