Do you need to design a speaker system with a bass reflex port? Our Bass Reflex Calculator can help you find the tuning frequency, volume of the speaker box, or crosssectional area of the port. For calculation, just enter tuning frequency and volume of the speaker box into the calculator, and it display cross sectional area of port.
If you want to determine port length switch calculator to advance mode and enter values into the given fields.
Bass Reflex Calculator
Enter the required values to calculate the tuning frequency or the port dimensions of a bass reflex speaker system. In advanced mode, you can also calculate the port length.
Using The Calc Guide
The Bass Reflex Calculator is simple to use tool. Just enter the known values into the input fields to find the missing one.
Input Fields and Example Values:
 Tuning Frequency: 40 Hz
 Volume: 0.05 m³
 CrossSectional Area: 0.01 m²
How to Calculate Bass Reflex
The Bass Reflex Calculator uses the following formula:
Formula:
$Fb = \frac{v}{2 \cdot \pi \cdot \sqrt{Vb \cdot \rho / A}}$
Variable  Description 

Fb  Tuning frequency of the bass reflex speaker 
v  Speed of sound in air (approximately 343 m/s) 
π  Mathematical constant (approximately 3.14159) 
Vb  Volume of the speaker box 
ρ  Density of air (approximately 1.2 kg/m³) 
A  Crosssectional area of the port 
Step Calculation Example
Here is a calculation example to guide you, how the this calculator compute your value.
For Example:

 Volume of Speaker Box (Vb): 0.05 m³
 CrossSectional Area of Port (A): 0.01 m²
Calculation:
1. Calculate the denominator first:
$\sqrt{Vb \cdot \rho / A} = \sqrt{0.05 \cdot 1.2 / 0.01} = \sqrt{6} \approx 2.449$
2. Now, calculate the tuning frequency (Fb):
$Fb = \frac{343}{2 \cdot 3.14159 \cdot 2.449} \approx \frac{343}{15.386} \approx 22.29 \, \text{Hz}$
3. Result: So, the tuning frequency (Fb) is approximately 22.29 Hz.
Input Examples
1. Basic Calculation Example
Input Field  Value 

Volume of Speaker Box (m³)  0.05 
CrossSectional Area (m²)  0.01 
Calculated Tuning Frequency (Hz)  22.29 
2. Advanced Calculation Example
Input Field  Value 

Volume of Speaker Box (m³)  0.08 
CrossSectional Area (m²)  0.015 
Calculated Tuning Frequency (Hz)  16.62 
FAQs
What is a Bass Reflex Calculator?
It helps calculate the tuning frequency, box volume, and port area when designing speaker systems.
Can I calculate the port length with this calculator?
Yes, the advanced calculator can find the port length if you know the other values.
Do I need to know all the variables to use this calculator?
No, you only need to know two values. The calculator will find the third for you.
Final Thought
How did you find using the Bass Reflex Calculator? I hope it made designing your speaker system easier. Please share your experience and feedback on how this tool helped you. Your respond is valuable to us for his tool improvement.