![]() That’s where all the bone-shaking, window-rattling fun is! We’re right there with you. If you’re a true bass-head, you might be incensed at the idea that you’d want to cut out subsonic frequencies. Think of the filter as a slope, not an on-off switch. If your subsonic filter is set to 40 Hz or 30 Hz, notes will still get through but will be much quieter. Instead, the number you set the filter to represents the frequency at which it starts to reduce the intensity of the sound. It’s not important to understand exactly how they’re wired. The only thing you do need to know before we move on is that attenuation doesn’t completely dampen sounds of a certain frequency. We’ve already mentioned that the main mechanic these subsonic filters use is attenuation. It’s the opposite of a low-pass filter, which only attenuates signals above a certain line. In other words, it’s what we know as a high-pass filter: a filter that lets through signals above a certain Hz threshold and attenuates any signal below that threshold. ![]() (To learn more about frequencies and how they work, check out our Beginner’s Guide to Frequency Ranges.) It decreases the amplitude of those low notes you feel more than you hear. If you have one we missed, let us know in the comments! What Is a Subsonic Filter?Ī subsonic filter is a component on your subwoofer that reduces the intensity of notes which come through at lower frequencies. Our Q&A covers all the big questions you might have about subsonic filters. If you have an amplifier, preamplifier, subwoofer, or any other unit with a subsonic filter, and you want to use it in a way that won’t destroy it prematurely, you need to know what your subsonic filter is and how to adjust it. We’re here to help. Yet it’s not a topic amp owners can blow off. Others have adjusted theirs at multiple volumes and haven’t noticed any difference. Some people own amps with subsonic filter buttons that they never turn off for fear of breaking something. maybe after the rumble filter.Even among seasoned audiophiles, subsonic filters are a topic guaranteed to sow confusion. Any circulating currents that go through the shield will never mix with the audio ground because the audio ground is kept separate (white wire) and sensed differentially by the amplifier.Įdit: hmmm. So that means that the shield of cable 1 continues as the shield of cable 2, so you get a contiguous shield all the way from the RCA to the amplifier. 4) Cable 2 (amplifier end): white to pin 1, red to pin 3, shield to pin 2. RESIST ANY URGE to connect the shield to the pot common. ![]() As said in 2) the shield connects to the shield of cable 1 and to nothing else. Shield of cable one is connected to shield of cable 2 AND TO NOTHING ELSE!ģ) Cable 2 (Potentiometer end): white to potentiometer "common". Red wire to RCA signal.Ģ) Cable 1 (Potentiometer end): white to potentiometer "common". Cable 2 goes from the pot to the UcD input.ġ) Cable 1 (RCA end): shield and white wire to RCA ground. Cable 1 goes from the RCA terminals to the pot. I'm calling the two wires red and white because that's the colours they usually have. You'll need to use microphone cable (shielded twisted pair). There’s no good way of adding a potentiometer to a truly balanced connection, but in a “pseudo balanced” connection it is possible. Can I add a potentiometer and retain some of the benefits of this connection method?Ī: Indeed you can. My source is unbalanced and I would like to use the “RCA to XLR” cable method. ![]() If you are going to add a pot anyway I would do it before the filter. You shouldn't need a volume control if you can adjust the level of the sub out from the receiver. Iv'e used a lot of his projects they are very good. If you are going to buy one of Rod's PCBs you could ask him. ![]()
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