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

Canvas not supported which means you will not get the nice Home Theater graphic.

Master Volume Listening Level

Level [dB] from reference 0 dB (Reference) -3 dB -6 dB -10 dB -20 dB

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 Yes No
SL, SR Surround
SBL, SBR Surround Back

Subwoofer configuration

Small or Large:
Mains L, C, R Small Large
Surround Small Large
House curve [dB]
Reduction L,C,R + surround contribution 0 dB (Assumes full LFE in all channels possible) -3 dB -6 dB LFE only
Loss ref 1m/2π due to distance and room 0 dB (Small room <20m²) -3 dB (Medium room 20m²-30m²) -6 dB (Larger room >30m²) Use distance
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
S2 S4 S6 T110 T138 S6-14 Other.. 0 1 2 3 4 5 6
S2 S4 S6 T110 T138 S6-14 Other.. 0 1 2 3 4 5 6
S2 S4 S6 T110 T138 S6-14 Other.. 0 1 2 3 4 5 6
S2 S4 S6 T110 T138 S6-14 Other.. 0 1 2 3 4 5 6
Actual Sum SPL