Micka — loudspeaker enclosure calculator

A free online enclosure-design calculator that takes a driver's Thiele/Small parameters and predicts how it will perform in a given box — the tool end of the wiki's founding trio (the theory is ts-parameters-explained, the physics is loudspeaker-primer-hackaday). T2: a well-known, widely-used DIY tool, though a tool's model is only as good as its assumptions.

What it does

• Box types. Vented/bass-reflex (Bullock alignment), closed/sealed (with an adjustable Qtc), and custom enclosures.
• Inputs. Either pick a driver from a built-in database of hundreds of models (18Sound, Beyma, Eminence, Faital, and others) or type in T/S parameters by hand for a custom driver.
• Outputs. Simulated frequency response, impedance curve, step response, and group delay — so you can compare box volumes and port tunings before cutting any MDF. Includes temperature compensation for the acoustic maths.

Why it matters here

It is the design loop closed: the abstract parameters become a predicted curve you can iterate against. It also grounds the spoke's central claim — that a driver's behavior in a box is calculable in advance from its parameters, not found by trial and error — and shows where the design choices actually live (box volume, port tuning, sealed Qtc).

Re-checked 2026-08-30, and regraded stable

The calculator is live, free, and works: Thiele-Small inputs, vented-box on a Bullock alignment, closed-box to a target Qtc, a custom mode, frequency-response plots, vent dimensions, a driver database of 400+ models (18Sound, B&C, Beyma, Eminence and others), and a Spice-parameter export for taking the design into a circuit simulator.

Its stated last update is 11 June 2014. Twelve years. Grading it volatile was a category error on this wiki's part, not a risk about the tool — the freshness window kept surfacing a page whose subject has not moved since before most of this corpus's other sources were written. Regraded stable.

Worth saying why that is not a criticism of the tool. The physics it implements — Thiele-Small parameters, box alignments — has not changed either. A calculator over settled theory is finished when it is correct, and the 2014 date is evidence of completion rather than abandonment. The freshness convention assumes a moving subject; some subjects have stopped.

Related

loudspeaker-enclosure · thiele-small-parameters · ts-parameters-explained · loudspeaker-driver · synthesis