Verification note: Results are design aids, not stamped engineering or code approval. Always check the current project specification, adopted code, manufacturer data and latest edition of the cited standard before construction or procurement.

AUDIO

Speaker Calculator

Coverage, amplifier loading and PoE budgeting in one page.

Use this tool for early loudspeaker zoning checks, ceiling-speaker spacing, constant-voltage tap loading and PoE speaker switch planning.

Speaker sizing, coverage and power

Ceiling / speaker height (m)

Listener ear height (m)

Loudspeaker coverage angle (°)

Sensitivity (dB SPL @ 1 W / 1 m)

Target SPL at listener (dB)

Loudspeaker-to-listener distance (m)

Required headroom (dB)

System sizing mode

Speaker quantity

Tap setting per speaker (W)

Amplifier rated output on line (W)

Design reserve above tap sum (%)

Enter values and calculate.

AVIXA ceiling coverage: D = 2(H − h)tan(C/2)
AVIXA spacing: edge-to-edge D = 2r; minimum overlap D = r√2; center-to-center D = r
EPR uses sensitivity, inverse-square distance loss and headroom.
Equal speaker loads: parallel Z_eq = Z / N; series Z_eq = N × Z.
70V/100V planning load = sum of tap watts × selected reserve.
PoE switch budget uses PSE allocation by IEEE PoE type, not only device operating watts.

WORKED EXAMPLE

Example — ceiling speaker zone

In this example a 3.0 m ceiling with 1.2 m ear height and a 100° coverage loudspeaker gives an approximate floor coverage diameter. The same page also checks 70V tap load and PoE demand.

Source details

AVIXA CTS-D math resources — coverage, spacing and electrical-power-required relationships.
AVIXA Audio Coverage Uniformity — coverage planning reference.

IEEE Technology Navigator — Power over Ethernet — Type 1 15.4 W, Type 2 30 W, and 802.3bt up to 90 W.
Cisco PoE type/class reference — PSE vs PD power values.