Connect your Positive Grid Spark to another (larger, louder) guitar amp, direct box, PA system, or recording interface! 

This cable takes the STEREO signal from the headphone output of your Positive Grid Spark and sums it to mono, which allows you to then connect that mono signal to another guitar amp, DI/direct box, PA system, power amplifier, or recording interface so you don't lose any signal! If you're using a standard mono 1/8" TS to 1/4" TS cable for this, you're only getting audio from one side of the stereo field (Left OR Right, but not both). Or, if you're using a SPLITTER cable in reverse (1/4" mono TS to 1/8" stereo TRS) where the tip and sleeve of the 1/8" plug are merely shorted together, you can experience some not-so-pleasant artifacts, including phasing and distortion. This cable solves that problem. 

It includes the following:  5' (five feet) of low-profile, dual-conductor shielded cable. On one end is a 1/8" 3.5mm stereo TRS plug for connecting to the stereo headphone output of your Spark. On the other end is a 1/4" 6.35mm mono TS plug for connecting to the input of your other device (guitar amp, mixer, amplifier, recording interface, etc.) Inside this 1/4" plug are two resistors (see pics) that are used to sum the signals from the left and right output channels, sending the combined mono signal to the tip of the 1/4" mono TS plug. The sleeve is connected to the shield of the cable like normal. So you get a perfectly summed mono signal with no distortion or phasing, and it won't damage the headphone output of your Spark. You'll note from the pictures that I also use high quality connectors and heat-shrink tubing to cover the resistors and prevent shorts inside of the 1/4" TS plug.

From the research I've done, there are no off-the-shelf cables from any major cable manufacturer on the market that do what this cable does. It's a widely-known problem, but no one has addressed it--until now. There are other cables that claim to do it, including the Hosa CMP-103, CMP-105, and CMP-110, but none of them do it properly. Those cables are actually SPLITTER cables that some people use in reverse for summing, but they simply short the tip and ring together, without any resistors to protect the outputs and prevent them from driving each other like an input.

How our cables are different: you may have seen some other mono summing cables online that are constructed with resistors (their name might bring to mind a fishing trip, LOL) . These cables appear to have a low price, but that's for a 1-ft length cable. For a 6-ft cable (ours are 5-ft in length), the price is pretty much the same as ours. However, their cables are built with cheap connectors that have a pinching/clamp style strain relief, and then they cover them with heat shrink. This type of strain relief does not grip the cable firmly and can even damage the cable over time with use. Their 1/8" plugs often do not fit snugly in the headphone jack of some devices, and the outer shell of the plug is too large to fit many devices if the device is inside of a case (e.g. phone or tablet). Our cables use a low-profile 1/8" connector with molded strain relief that fits firmly in most devices, and the outer part of the plug is small enough to fit the headphone jack in virtually any device--even if it's in its case. Also, our 1/4" plugs use a chuck-style strain relief that provides superior gripping action without damaging the cable in any way when compared to the pinch/clamp style relief. Our cables are the original mono summing cable with resistors, which we've been selling now for many years with hundreds of satisfied customers. Please take this into consideration when buying a cable.  

For further reading on this subject, just Google search "Why Not Wye", which will lead you to an article on the Rane website that explains the problem and its solution in more detail.

Contact me with any questions.