Source: https://guthlabs.ai/docs/instruments/speaker-load-impedance-matching-calculator/implementation/

instrument implementation / implementation-contract

# Speaker/Load Impedance Matching Calculator implementation

A source-bound implementation contract for Speaker/Load Impedance Matching Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-222

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification exposes invalid-input and undefined-result hazards at zero or nonphysical impedances, and its parallel power-handling wording is convention-dependent. A robust implementation must reject nonpositive impedances, guard a zero parallel denominator, and label whether power handling is total pair power or per-speaker power.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "speaker_impedances": [
      {
        "value": 8,
        "unit": "ohm"
      },
      {
        "value": 8,
        "unit": "ohm"
      }
    ],
    "topology": "series"
  },
  "expected_outputs": {
    "combined_nominal_impedance_ohm": 16,
    "power_handling": null
  },
  "working": "Series formula: Z = Z1 + Z2 = 8 Ω + 8 Ω = 16 Ω. Power handling is undefined from the supplied inputs because no speaker power ratings or amplifier operating condition are provided."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/speaker-load-impedance-matching-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/speaker-load-impedance-matching-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/speaker-load-impedance-matching-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`