![]() It will take one of the signals and reverse or invert it, so that the peaks of the second waveform will occur closely in unison with the other. What it does is quite obvious from its name. So to avoid this, many ABY boxes will feature a "polarity reversal" switch. If a power struggle materialises with the opposing frequencies cancelling each other out, you'll be left with a flat and thin sound. Those simultaneous frequencies may then end up fighting one another if 180 or 90 degrees out-of-phase, which you certainly don't want! Sometimes this is worse with similar amp combinations, but it may not occur with a more diverse pairing. However, those frequencies will be slightly different, as they are emitted through different amps with their own unique tonal characteristics. If you're playing either a riff or a chord progression with an ABY unit splitting your signal into two, what you're playing is doubled and those frequencies will oscillate at the same speed. The problem with cancellation is that it gives an unpredictable and inconsistent tone, essentially neutering your overall sound. This is also known as 180 or 90 degree phase cancellation respectively. This occurs when similar frequencies from separate sound sources are played together, which are exactly or partially opposite one another. Running two amps together may give you an awesome sound, but doing so can result in phase cancellation. This provides an amazing aural experience, and is used a lot by guitarists in the studio too. With multiple delay types such as "ping-pong" available, in a stereo setup the delay repeats will bounce between the speakers of each amp. In stereo, they really enhance your overall sound!įor example, most multi-delay pedals like those offered by Strymon and Boss will have stereo integration. You'll find these commonly on delay, reverb and modulation effects in particular. There are many modern pedals that have dual inputs/outputs marked "L" and "R", signifying left and right. Another big advantage of a stereo rig is to use stereo effects in conjunction with your amps. This just offers a larger, more three-dimensional vibe - and in most instances, it sounds incredible. So to emulate that in a live situation, many players will use an ABY unit to run their amps together, with each on different sides of the stage or separated by some distance. Our ears pick up sounds from all around us, and in music production you'll find that most recorded guitars are double-tracked and panned hard left and right. Stereo is where you have two sound sources placed left and right. For him, it is clearly a winning combination! If you want to learn more about capturing his tones, check out our dedicated 'Sound Like Tool' blog.Ĭan You Form A Stereo Amp Rig With An ABY Pedal?Īnother reason why some players use two amps is so that they can form a stereo rig. However, his old 1976 Marshall Super Bass provides plenty of vintage mid-range to give his sound more focus and punch. His Diezel VH4 delivers all of the powerful high-gain he requires for his famously heavy riff-work. Looking at the latter in particular, Adam Jones has maintained the same amp combination in his band for almost 20 years. There are many high-profile names that use multiple amps for this purpose, such as John Mayer and Adam Jones (Tool). Using multiple amps together can create a far richer tone, with more harmonic content and generally a bigger, more-engulfing sound. That may be enough to justify purchasing one, but some ABY boxes can offer far more tonal possibilities.įor example, more advanced ABY switchers also let you use two amps simultaneously and in conjunction with one another. It therefore adds an element of versatility, as it gives you the choice between your favourite amplifiers. As we have mentioned, an ABY lets you switch between amps for a wider range of tones.
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