Guitar amplifiers come in various forms, from traditional amplifier heads paired with speaker cabinets to combo amplifiers that integrate both components into a single unit. One intriguing question that often arises among guitarists is whether you can use a combo amp as a head. In this comprehensive article, we’ll explore the possibilities and considerations involved in using a combo amp as a head, shedding light on how this approach can offer versatility and creative opportunities in your guitar rig.
Understanding Combo Amplifiers
Combo amplifiers, or combo amps, are self-contained units that combine an amplifier head with one or more speakers in a single enclosure. These amplifiers are popular for their convenience, portability, and the fact that they offer an all-in-one solution for amplification needs. A typical combo amp includes the following components:
- Amplifier Head: The amplifier head section of a combo amp consists of the preamp and power amp stages, controls for gain, EQ, and often built-in effects. It performs the core amplification functions.
- Speaker(s): Combo amps house one or more speakers within the same enclosure as the amplifier head. The choice of speaker(s) significantly affects the amplifier’s tone and projection.
- Cabinet Design: The cabinet design, including the size, shape, and construction materials, can impact the overall sound and resonance of the combo amp.
Using a Combo Amp as a Head: Possibilities and Considerations
- Extension Speaker Output: Many combo amps include an extension speaker output on the rear panel. This feature allows you to connect an external speaker cabinet to the combo amp. When you do this, the internal speakers of the combo amp and the external cabinet work in parallel, resulting in increased volume and dispersion. This setup is commonly used by guitarists seeking additional power and projection for larger venues.
- Tonal Flexibility: Using a combo amp as a head with an external cabinet allows for tonal flexibility. You can experiment with different speaker configurations and cabinet sizes to shape your desired sound. For example, you could pair a combo amp head with a 4×12″ cabinet for added volume and a different tonal character.
- Versatility for Gigging: If you own a combo amp and occasionally need more power for gigging in larger venues, using an external cabinet can be a cost-effective way to achieve the necessary volume and projection without investing in a separate amplifier head.
- Impedance Matching: It’s crucial to ensure that the combo amp’s extension speaker output matches the impedance of the external cabinet you intend to use. Mismatched impedance can result in poor performance and potential damage to the amplifier.
Benefits and Drawbacks
Benefits of using a combo amp as a head with an external cabinet:
- Increased volume and projection.
- Tonal versatility and the ability to shape your sound.
- Cost-effective option for gigging in larger venues.
Drawbacks and considerations:
- Weight and portability may become an issue when adding an external cabinet.
- Potential impedance matching challenges, requiring attention to detail.
- Changes in tone and character may require adjustments and experimentation.
Conclusion
Using a combo amp as a head with an external cabinet is a versatile approach that allows you to tap into the potential of your existing gear. It offers increased volume, tonal flexibility, and versatility for different performance scenarios. However, it’s essential to carefully match impedance and consider the logistical aspects of transporting additional equipment when using this setup. With the right configuration and attention to detail, using a combo amp as a head can be a valuable addition to your guitar rig, opening up new possibilities for your music.
