DI Box
Turning a high-impedance instrument signal into a balanced low-impedance one
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A DI box converts a guitar-style high-impedance, unbalanced instrument signal into a low-impedance, balanced one, so a mixer or interface can take it over distance. It can also provide ground isolation and reduce hum.
It differs from a preamp: a DI mainly does impedance and balancing, a preamp supplies gain. The usual mistake is to treat it as an adapter — mismatched impedance thins the tone and loses highs; the DI is the first gate of the signal chain.
Read deeper → impedance
Sources
- DI 盒的阻抗变换与平衡输出，参通行录音教材；本文为原创表述
Used for fact-checking only; all prose is original.