100V Line Calculator

Calculate power distribution and cable losses for 100V/70V constant-voltage speaker systems.

Load:120W / 240W

Headroom:120W (50%)

Speakers:4

PASS

Amplifier

Output Power (W)

Line Voltage

Speaker Types

1 type, 4 speakers total

Name

Tap (W)

Qty

Results

Amp Power240 W

Total Tap Load120 W

Headroom120 W (50%)

Per Speaker Type

Speaker Type 130W × 4 = 120W

Cable Loss

Estimate power lost in daisy-chained speaker cable runs

Enable cable loss calculation

How It Works

100V (or 70V) constant-voltage systems use a transformer on each speaker to step down the line voltage. Each speaker has a "tap" setting that determines how much power it draws.

Rule: The total of all speaker tap settings must not exceed the amplifier's rated power.

Headroom: A margin of 20–30% is recommended to avoid distortion and allow for expansion.

Disclaimer

These tools are provided in beta and are subject to change. All calculations and results may contain errors and should be independently verified by a qualified professional before use in any design, installation, or safety-critical application. AV500 accepts no liability for decisions made based on these outputs.