Free Subwoofer Box Creator
Free Speaker Enclosure Design Software
Free Subwoofer Box Design Software

Use this free software to assist you in building your 'sonosub' style subwoofer.

Sonosub saves you having to get out the calculator to work out the sizes for your tubes. It also checks that your components will all fit with the correct clearances.

Features of current version - V2.03

We can provide you with comprehensive Subwoofer Box Calculator for online creating a high performance subwoofer enclosure. Build a ported box, sealed box for your low-frequency speaker. Make a subwoofer enclosure plan. Calculate a speaker box volume, port length and other parameters without getting confused in formulas. Boxnotes - check your enclosure design for resonances, factor in the volume taken up by ports and print your cutting list Sonosub - design a cylindrical subwoofer. Check resonances and clearances Flare-it, - find the correct port diameter and flare size to avoid audible turbulence Subsaver - calculator for finding component values for a 2nd.

Specify Working volume & Tuning frequency to find Height & Port length or vice versa
Graphic shows port, cover plate and driver mounting details at a glance
Checks for sufficient clearances between components
Select driver from built-in list of common drivers or enter manually
Missing parameters automatically estimated from list of generic values
Work in metric or imperial measurements
Preferences automatically saved
Project can be saved for future reference
Most often used variables and results located on front screen
Endcaps screen allows full specification of timberwork
Account for change in tuning with port flares
Sag calculator to check suitability of driver for downfiring use
Print function on main screens

Sonosub is written in Visual Basic 6 and runs under Windows.
Security information:
Filesize 815,104 bytes
MD5 Hash Code 7B9043773F9BDCFD4CEFCCF05B9D7079
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Notes: After downloading a new version of this software, you may find that opening a previously saved project results in the wrong driver being shown.
This is a result of adding drivers to the internal database whilst the project files store the driver as a number only. If this is the case, please re-select your driver from the list and re-save your project.
This should be sorted in a release or two, meanwhle it was felt that the advantage of having current drivers listed outweighed any inconvenience.

Additional screenshots

The built-in database has some common drivers listed.
If you wish to enter a driver manually, you will need to supply up to four parameters.
If you don't know one of the values, just enter zero for it's value.The software will use the generic value based on the nominal diameter you select for the driver. (shown here in red).
When you return to the front screen, the known values will be shown in blue and any substitutions will be shown in red.

Several of the checks need some explanation..
Clearance between port intake and driver should equal to or larger than the port diameter
Clearance between port exit and top cover (when fitted) should equal to or larger than the port diameter.
The gap between the driver and the bottom plate should be such that the air leaving the driver doesn't encounter a cross-sectional area that is any smaller than the cone area.
This check is simplified somewhat by basing it on the nominal diameter of the driver.
A Resonances Experiment was conducted to determine what type of resonance occurs between the driver and end wall

FAQ

Q1. How much clearance is required between the bottom endcap and the floor plate?

The quick answer..

gap = nominal diameter / 4 for most drivers or
gap = nominal diameter / 3 for high excursion drivers

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Consider this drawing..

The principle applied..

Air movement generated by the driver shouldn't encounter any reduction in the CSA through which it has to flow. (green area in graphic)

The maths..

The smallest area is represented by the green cylinder, and has a total area of:
gap * circumference = gap * pi * (nominal diameter)
This must equal the Sd of the driver, or in our example, pi * (nominal dia / 2)^2
So ..
gap * pi * (nominal diameter) = pi * (nominal dia / 2)^2
dividing both sides by pi..
gap * (nominal diameter) = (nominal diameter^2) / 4
dividing both sides by nominal diameter..
gap = (nominal diameter) / 4
More accuracy could be obtained by calculating effective diameter from Sd, and factoring in the height of the surround vs driver rebate depth, but this method is going to be fairly close.
If you have a driver with a large Xmax, you would build a bit of leeway in by dividing by 3 instead of 4
Sonosub.exe v2.00 divides by 5, meaning it's check is not rigorous enough
From Version 2.01 onwards, this was changed to 4.

This would give you...(all sizes in inches)

Driver nominal diameter	Clearance for normal driver	Clearance for high-excursion driver
10	2.5	3.4
12	3.0	4.0
15	3.8	5.0
18	4.5	6.0
21	5.3	7.0

Q2. How much clearance is required for the port?

The distance between the port intake and the back of the driver must be no smaller than the internal diameter of the unflared portion of the port.
The same clearance is required between the top endcap and top cover plate (when used). Sonosub.exe issues a warning if either of these clearances is too small

Q3. Do I need flared ports?

Yes you do. Flared ports allow a higher airspeed before audible turbulence occurs.
See the section on port flares for help with calculating flare requirements
Most sono builders use a roundover bit in the router to flare the port exit in the top endcap.

Free Subwoofer Box Creator

Making a flare for the port intake is described in the donut ring walk-through

Q4. How much of a problem are the resonances?

In a normal box, a driver-to-rear-wall resonance that occurs in the working frequency range, can be troublesome, adding a peak of up to 6d

Free Subwoofer Box Calculator Software