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Ubify Media & Design Operations
UI/UX & DIGITAL MEDIA SPECIALISTS
About This Tool
Loudspeaker enclosure designers and acoustic engineers size folded horn subwoofers using Webster horn equation to establish low-frequency acoustic loading. The true exponential horn cutoff frequency follows fc = (m × c) / (4 × π), where m is the horn flare expansion constant, c is speed of sound in air (~343 m/s at 20°C), and minimum horn mouth perimeter must approximate one acoustic wavelength (λc = c / fc) to avoid bass reflection cancellations. On this page, user acoustic inputs are evaluated using a 3-variable comparative index model, providing instant design ratings with zero remote server calls.
How to Use
- 1
Enter your primary horn mouth area or acoustic path dimension in the first field.
- 2
Input your flare rate expansion constant or frequency coefficient in the second box.
- 3
Specify the driver impedance safety divisor factor (minimum divisor 0.01).
- 4
Review the calculated horn rating, geometric root factor, and acoustic loading percentage.
Frequently Asked Questions
What formula does this calculator evaluate?
The calculator computes index = (primary dimension × coefficient) / max(0.01, safety factor), alongside geometric root sqrt(primary × coefficient) and load ratio percentage (primary / (primary + coefficient)) × 100.
Does this compute true hyperbolic-exponential (tractrix) boundary flare profiles?
No, this page implements a generic 3-variable comparative index model rather than evaluating complex tractrix horn mouth impedance integrals.
Are your enclosure dimensions sent to an external server?
No. All calculations run strictly client-side inside your browser JavaScript runtime with zero external data transmission.