Is it possible to turn your iPhone into a guitar amplifier?

To become a true guitar hero, you'll need more than just a guitar. Your instrument alone won't be enough—without an amplifier, your solos won't be heard by the crowd. Not all amplifiers produce the same sound, so you'll have to choose one that delivers the tone you seek. Effects pedals give you even more control over your sound. However, all this gear can take up valuable space and become a real hassle to transport.

"But that's what roadies are for," you might argue. And you're right. However, when you're just starting out, roadies are often scarce. The unfortunate truth is that you'll probably have to carry your own gear from show to show. Lugging all that equipment around isn't easy, especially when you're on the brink of a hernia.

But what if you could combine all that gear into one portable device? Imagine if this device could mimic the effects of every pedal and amplifier. And what if you could switch between virtual gear instantly, offering you almost unlimited possibilities?

It turns out that there are products available today that allow you to plug your guitar into an iPhone and use it as a fully functional amplifier with all the bells and whistles, including wah-wah pedals. How is that even possible?

Tune Up, Plug In, Rock Out

Devices like IK Multimedia's iRig, Peavey Electronics' AmpKit LiNK, and PocketLabWorks' iRiffPort allow you to connect your electric guitar to an iPhone or other iOS device. A specialized app on the device handles the processing, synthesizing your chosen gear so the sound output is remarkably close to what you'd hear from a guitar plugged into real amplifiers and effects pedals.

While these devices aim to replicate the experience, they each approach it differently. Devices like the iRig and AmpKit LiNK feature a 1/4-inch (6.4-mm) female input jack and a male headphone plug that connects to your iPhone's headphone jack. They also offer a female 1/8-inch (3.2-mm) output jack for headphones.

By connecting these devices to the headphone jack of your iPhone, you create the necessary link to transform your iPhone into a guitar amplifier and effects studio that you can hold in your hand. The headphone jack also serves as a microphone port, enabling you to plug in a headset with a mic for calls. As you strum your guitar, the electrical signals from the guitar travel through the output cable to the device, which acts as an intermediary and sends the signal through the headphone cable to your iPhone. The iPhone then processes the signal, converting it from analog to digital.

The iRiffPort uses a different approach for connecting. Rather than plugging into the headphone jack, it connects to the 30-pin port at the base of your iPhone. The guitar's signal passes through the iRiffPort, where it is converted from analog to digital. The digital signal is then sent to the iPhone through the Apple dock.

Once the signal reaches your phone, the software takes over to handle the rest.

This iPhone Goes to 11

Traditional guitar equipment is analog, which means its signals are continuous. If you were to plot an analog signal on a graph, it would appear as a smooth, unbroken curve. Analog equipment keeps this continuous signal intact. An analog amplifier is physically wired to receive, amplify, and process the signal. However, analog gear is limited by the capabilities of its physical connections. Different amplifiers always produce distinct sounds, with variations in components and techniques used by manufacturers, sometimes differing from model to model.

Converting the analog signal into a digital format and manipulating it within a virtual amplifier opens up a wide range of possibilities. There are several sound processing apps for the iPhone that allow you to replicate the sounds of various real-world analog equipment, often so accurately that it’s nearly impossible to tell them apart from an actual physical setup.

With the right software, you can transform a digital signal to sound like virtually anything. You’re not restricted to the typical effects found with analog equipment. However, this approach does have its downsides as well.

Digital amplifiers might not capture every sound perfectly. You might notice that some effects or tones feel incomplete or slightly off. There's also a psychological factor involved – sometimes, a traditional amplifier might feel like the better option simply because you're more accustomed to it.

Another issue with iPhone amp kits is that some may add noise to your signal. You might hear unwanted hissing, especially in the high frequencies, or notice that some signals don't come through clearly. Many of the iPhone amplifier kits offer noise reduction features, either by adding software options or, as with the AmpKit LiNK, using a powered peripheral that processes the signal before it reaches your phone.

With the output jacks on these kits, you can route a processed signal to another device, such as headphones, a sound system, or even a mixing board. This means you could leave your bulky gear behind and simply take your iPhone to your next performance – provided there's amplification available. As technology advances, we may witness a shift away from traditional analog gear. While some artists may cling to their analog equipment, just as electric guitars once faced doubt and resistance, look where they are now!