Amps, in software
An amp sim models the sound of real guitar amplifiers, speaker cabinets and effects digitally. Plug your guitar into an interface, load the sim on a computer or a hardware unit, and you get amp tones through headphones or speakers.
Why players use them
- Silent practice and recording — no loud amp needed.
- Many amps and effects in one place, cheaply.
- Consistent tones for recording and playing live.
- Great for home studios and travel.
Why “silent practice” is not automatically safe practice
The whole appeal of an amp sim is that it moves the sound from a speaker cabinet in a room to a pair of headphones — which sidesteps disturbing anyone else, but does not sidestep your own hearing. NIOSH’s exposure guidance is defined by level and duration, not by which device the sound comes out of: its 85 dBA over an eight-hour day reference point, and the 3 dBA exchange rate that halves safe duration for every 3 dB increase, apply exactly the same way to a loud headphone mix as to a loud amp across a room. “It’s just headphones” is a common assumption and not one NIOSH’s own figures support.
What an amp sim is actually standing in for
Kept at the level of what is checkable rather than the specific engineering underneath it: an amp sim’s job is to reproduce, in software, the combination that used to require an actual amplifier and a mic’d speaker cabinet in a physical room — the same tonal shaping, run digitally instead. That is a general description of the goal, not a sourced technical claim about how any particular product achieves it; the specific modelling methods vary by manufacturer and are not detailed here.
Same reference point, different source: a loud tube amp in a room and an amp sim through headphones set to a comparably loud, immersive level can land in the same NIOSH exposure band. The software changed where the sound comes from; it did not change what your ears are actually exposed to.
The trade-off
Modern amp sims sound remarkably good and are everywhere in professional recordings. Purists still prefer the feel and air of a real tube amp pushing a speaker, but for most players the convenience and quality of sims are hard to beat.
Check your headphone level against the same reference point
Pick how your monitoring level actually feels, and this applies NIOSH’s same 85 dBA / 8-hour reference and 3 dBA exchange rate used for a loud amp.
Illustrative only — actual headphone output varies a lot by device and volume setting, and this does not measure yours. Ringing or dulled hearing afterward is NIOSH’s own warning sign, regardless of the number here.
Where this comes from
CDC/NIOSH — Understand Noise Exposure, last reviewed 31 January 2024: the 85 dBA / 8-hour recommended exposure limit and the 3 dBA exchange rate, reused above for headphone monitoring. cdc.gov · accessed 4 August 2026.
CDC/NIOSH — Noise-Induced Hearing Loss, last reviewed 30 January 2024: the warning signs of hearing damage referenced above. cdc.gov · accessed 4 August 2026.
The description of what an amp sim reproduces is general, not a specific sourced technical claim. NIOSH’s guidance is level-based regardless of source (speaker or headphones); actual headphone output varies by device and is not measured by the calculator above.
Common questions
Do amp sims sound as good as real amps?
Modern ones are very convincing and widely used on professional records. Some prefer a real amp's feel, but the gap is small.
What do I need to use one?
A guitar, an audio interface to connect it to a computer, and the amp-sim software — plus headphones or monitors.
Are there free amp sims?
Yes — several good free options exist, which make them an easy, low-cost way to start.