Posts belonging to Category Mono Summing



Direct Boxes (DI’s) with Stereo to Mono Summing

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In my article, The Stereo to Mono Summing Cable that No One Makes, I described how to build (or buy) a cable that will take a stereo unbalanced signal and sum it to mono for connection to a PA system (mixer, power amp, etc.). You can connect the output end of such a mono-summing cable directly to a regular line 1/4″ line input. If, however, you need a balanced signal for connection to an XLR mic input on a mixer, you’ll need to use a mono-summing cable in conjunction with a DI box. Since writing that article, there have been several DI boxes that have hit the market that do something similar to what the mono-summing-cable-plus-DI-box combo do, so I thought it might be good to provide a quick overview of some of them. I’ve decided to list these in the order of the selling price from least to greatest. (more…)

Summing Two Mic Signals

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One of my most popular articles has been The Mono Summing Cable that No One Makes. I’ve been contacted by more readers regarding that article than probably any other that I’ve written. That article details why it’s a bad idea to use a regular Y-cable or TRS-to-TS cable to sum two (usually stereo left & right) line-level signals to mono by simply shorting the outputs together. It’s ok to use such a cable for SPLITTING a signal, but not for COMBINING or SUMMING two signals. That being said, it can work ok on some devices, but on others it can cause distortion, weird phasing artifacts, and possibly even damage the outputs of your gear. However, combining the outputs of two dynamic microphones is a different story, and in some applications it’s ok to do so with a regular XLR Y-cable, as we will soon see. (more…)

Balanced Line-Level Stereo to Mono Summing Box

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One of my most popular blog posts has been The Stereo to Mono Summing Cable that No One Makes. I get contacted pretty much on a weekly basis from someone who wants to buy or build that cable to connect their iPod, phone, laptop, etc. to their PA system. I decided to take the concept a step further and build a balanced, line-level stereo to mono summing box. Just like the mono-summing cable, it appears that there aren’t any readily-available, off-the-shelf products that do exactly what this box does. There are some mic combiners (e.g., Galaxy Audio’s JIB/C) that are made for connecting two microphones to a single input, but those use much lower-value resistors, making them unsuitable for line-level signals (I even contacted Galaxy about the JIB/C, and that’s what they told me). (more…)

The Stereo-to-Mono Summing Cable That No One Makes

Have you ever used a stereo-to-mono “Y-cable” or TRS (Tip/Ring/Sleeve)-to-TS(Tip/Sleeve) cable for combining two audio outputs together, or for summing the Left and Right channels from a single stereo output to mono? For example, maybe you wanted to connect the stereo outputs of your computer, CD player, iPod, iPad, Android tablet or phone into a single 1/4″ input channel on an audio mixer. Or maybe you needed to sum a stereo signal to mono for connecting to a single subwoofer. Or maybe you were mixing a song in your home recording studio and needed to check your mixes in mono on a single “grot box”, like the Auratone or one of its clones (Avantone Mix Cube, Behringer Behritone C5A, C50A, etc.). If you’re anything like me, you’ve probably done this, but what you may not know is this: a Y-cable or stereo-to-mono cable used to SPLIT a signal into two outputs is being used properly. A Y-cable used to MIX or COMBINE two signals into one input is being abused, and may even damage your equipment! (more…)