If you use an RCA adapter and leave one of the RCA inputs open, then dirt may get clogged in overtime. 6. Some Subwoofers May Need A Y Splitter Cable Since both inputs are driven, you will get more input signal when the amp sums the two inputs together. In the world of pro audio, Y cables are one of the most frequently-used cable types. These connectors get their name from the fact that their 3 ends resemble the letter "Y" (1 common end that splits into 2 ends on the other side). Y cables are often used for inputting and outputting stereo mixers and their length can range from 1 foot to 19 feet. In this catalog, you'll find that many big names in pro audio specialize in their own Y cable models, including Livewire, Pig Hog, Rapco Horizon and Bespeco. Make no mistake, if you're in the market for a Y cable, look no further than this section. Using Y splitter cables can reduce the amount of Radio Frequency (RF) and Electromagnetic (EM) interference that is fed to your sub which of course causes that annoying hum.

consolidating connectors (feeding signals from two output connectors to a multi-pole input connector, keeping the signals separate); [5] Many people use a Y splitter to connect both subwoofer inputs so they can prevent this problem because the auto-on mode of some older subwoofers (e.g the Velodyne CH-12) may not come on at lower levels without the use of a Y cable. 4. Hum Reduction Robjohns, Hugh (January 2013). "Lewitt Audio DTP640 REX". Sound on Sound. A 1.5m Y-cable is supplied with the mic ... to convert the five-pin connection into two standard three-pin XLR connectors, each with labelled cable sleeves to identify which provides the dynamic element signal, and which the capacitor element.

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Subwoofer hum is a common problem in home theater systems. It is so common that sometimes your subwoofer may hum without any input.

Robjohns, Hugh (May 2017). "How best can I split a mic signal?". Sound on Sound. [If] you were to split the mic signal with a simple Y-cord the mic would indeed 'see' the two input destinations effectively in parallel with each other, and that will result in the effective load for the microphone being reduced below the impedance of either. [Transformerless] capacitor and active-dynamic mics won't have a problem at all [but] if the impedance gets too low, you might possibly notice a small change in the tonal character or transient response with traditional dynamic mics and transformer-output capacitor mics. [So a] simple Y-cord (parallel split) can certainly work, and I've used that technique myself on occasion, but it does open the door to conflicting phantom-power supply problems, and makes ground loops very likely. The way around the ground-loop issue — this applies to active splitter/preamp techniques too, of course — is to disconnect and isolate the cable screens for all but one of the outputs at the destinations. Balanced connections don't employ the cable screen as a ground reference, so disconnecting it won't affect the signal transfer (but it is required for the return phantom current, so needs to be present in the connection to the preamp providing phantom power).Most Y splitter cables are built with effective copper-braid shielding that eliminates any occurrence of signal interference and will offer noise-reduced transmission and overall better quality. The split occurs either as a zip cable or with a small box that hides the split which then finishes with two connectors at the other end. What Is A Y Cable Used For? Many people like this potential of boosting the sub’s output signal. In general, you will increase the sound level from 3dB to 6dB.