Short answer
The useful distinction is where electricity enters the sound-making process, not simply whether an instrument has strings or a cable. An acoustic instrument can produce a functional sound unplugged; an electric instrument uses an electrical sound path for generation, control, or shaping. Acoustic-electric instruments bridge those descriptions: Grinnell’s example works acoustically but also has an integrated pickup. 1 2
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At a glance
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| Question | Acoustic instrument | Electric instrument |
|---|---|---|
| What starts the sound? | Physical vibration in the documented guitar | Physical vibration plus a transducer, or electrical generation |
| What does electricity contribute? | Not required for unplugged operation | Generation, amplification, control, or effects |
| Can labels overlap? | Yes: an acoustic guitar can include a pickup | Yes: the same guitar can be electroacoustic |
These are working distinctions drawn from the sources, not exhaustive definitions of every instrument. 1 2
What each thing is
The acoustic side is illustrated by a classical guitar whose strings and resonating body function without its pickup system. The electric side is broader than an electric guitar: the museum discusses transforming electrical currents into musical sounds as well as electrifying existing instrument families. “Electric” therefore covers more than one sound-generation arrangement here. 1 2
Key differences
Separate the initial vibration from the sound delivered to listeners. In Grinnell’s acoustic-electric guitar, strings initiate the sound, while the pickup converts their vibration into an electrical signal. Through the amplified path, a speaker produces the audible output. Electrical processing also permits volume and tone control; it need not replace the original vibrating source. 1 2
How to tell them apart
Trace the sound path: identify the vibrating source, any pickup or electrical generator, and the role of the loudspeaker. Ask whether unplugged operation remains musically functional. That test identifies the acoustic capability of Grinnell’s guitar, but it cannot establish an exclusive label: the collection still classifies that instrument as an electrophone. 1
Where they overlap
Electroacoustic instruments are the clearest overlap. Grinnell’s guitar combines an acoustic classical-guitar design with integrated electrical amplification and equalization. Its pickup aims to retain the acoustic character. Thus, electrically delivered sound is not necessarily an attempt to create a radically different timbre. 1
Edge cases
The same instrument can receive different descriptions depending on the question. Grinnell calls its example an acoustic-electric classical guitar, yet its formal classification is an electro-acoustic chordophone within electrophones. A description of unplugged capability and an organological classification can both be accurate; neither should silently replace the other. 1
Why the distinction exists
The distinction separates an instrument’s acoustic capability from the contributions of electrical technology. Grinnell emphasizes amplification for situations where the acoustic guitar would be difficult to hear. The museum also emphasizes new tones, effects, and control: electrification can preserve a sound, reshape it, or enable another way of producing it. 1 2
Common misconceptions
“Electric” does not mean “without vibrating strings”: Grinnell explicitly describes strings plus a transducer. Nor does “acoustic” necessarily mean “without electronics”: its guitar includes a pickup while remaining functional unplugged. Finally, these labels are not musical genres; Grinnell associates its example with no single genre. 1
Examples
First, the documented Takamine played unplugged demonstrates acoustic operation; plugged into an amplifier, it demonstrates an electroacoustic signal path without becoming a different physical instrument. Second, consider a hypothetical passage produced by converting electrical currents into musical tones, the approach described by the museum. Its generation process differs from amplifying the Takamine’s existing string vibrations. 1 2