Audio calculator for loudspeaker requirements

Øyvind Kvålsvoll 31.07.2015

Calculator for Speaker Requirements

Calculates data for home theater speaker specifications based on requirements for sound pressure level and room data. Tooltip provides additional information.

Ceiling speakers for immersive sound: Use Surround Speaker Requirements calculator for ceiling speakers.

Automatic unit conversion for length input from mm, cm, in, ft to meters.

SPL Requirements Specification

Master Volume Listening Level Level [dB] from reference

Room data Width [m]
Length [m]
Height [m]
Reverberation time T60 [s]
Low-frequency T60 [s]

Room volume
fs (Schroeder freq)

Speakers and room Distance to Listening position [m] Q (Speaker directivity) Critical Distance
L, R Main Speakers
Center Speaker
SL, SR Surround
SBL, SBR Surround Back

Subwoofer configuration Small or Large:
Mains L, C, R
Surround
House curve [dB]
Reduction L,C,R + surround contribution
Loss ref 1m/2π due to distance and room
Distance [m]

Main Speaker Requirements

L, R Mains SPL at lp SPL Radiated 1m Sens [dB 1m/2.83V] Power (8 ohm) Reverberant SPL at lp

Actual SPL lp Actual Power [W 8ohm] Actual Power [W 4ohm]

Show 4 ohm Power

Center SPL at lp SPL Radiated 1m Sens [dB 1m/2.83V] Power (8 ohm) Reverberant SPL at lp

Actual SPL lp Actual Power [W 8ohm] Actual Power [W 4ohm]

Show 4 ohm Power

Surround Speaker Requirements

SL, SR Surround SPL at lp SPL Radiated 1m Sens [dB 1m/2.83V] Power (8 ohm) Reverberant SPL at lp

Actual SPL lp Actual Power [W 8ohm] Actual Power [W 4ohm]

Show 4 ohm Power

SBL, SBR Surround Back SPL at lp SPL Radiated 1m Sens [dB 1m/2.83V] Power (8 ohm) Reverberant SPL at lp

Actual SPL lp Actual Power [W 8ohm] Actual Power [W 4ohm]

Show 4 ohm Power

Subwoofer Requirements

Output Requirement SPL 1m/2π Room gain SPL at lp
Required Sum SPL

Configuration Subwoofer Type SPL 1m/2π [dB] N SPL x N 1m/2π SPL at lp

Actual Sum SPL