Voltage Drop Calculator

Calculate the voltage drop and insertion loss of a cable based on the length of the cable run, the resistance of the cable, and voltage/current at source. Choose an Extron SPK Series cable or enter specifications of another cable.

Indicates required field

Determine Voltage Drop
  • Amps
  • Volts
  • Ohms/1000 feet

Voltage Drop

Volts

Output Voltage

Volts

Insertion Loss

Decibel

FAQs

The voltage drop calculator estimates voltage drop and insertion loss across a cable based on cable length, resistance, and source voltage and current.

Excessive voltage drop can reduce available power at the load, potentially affecting loudspeaker performance and overall system reliability.

The calculator requires cable run length, source voltage, source current, and the selected cable type or user‑entered cable specifications.

Yes. The calculator allows users to select Extron SPK Series speaker cables or manually enter specifications for another cable type.

No. The calculator provides estimates to support design decisions and should be used alongside manufacturer data and system requirements.