Transfer Function Magnitude Graph

How transfer function magnitude normalizes SPL to a passband reference to expose enclosure shape.

Direct answer

The transfer function magnitude graph shows response shape relative to a passband reference instead of absolute SPL.

What it measures

• SPL offset in dB from a reference derived from the upper passband or, for bandpass designs, the response peak.
• A zero dB reference line.
• Relative rolloff, peaking, and alignment shape independent of absolute sensitivity.

Why it matters

• It separates enclosure response shape from driver sensitivity and input power.
• It makes cutoff and alignment differences easier to compare.
• It helps inspect whether a design is flat, peaked, or rolling off as expected.

How to read it in 00 Simulator

• Treat 0 dB as the local passband reference for that result.
• Use negative values to judge rolloff depth and positive values to spot peaking.
• Compare with the absolute SPL graph before making output decisions.

What good, warning, and bad usually look like

Good

The normalized shape matches the intended alignment without surprising peaks or dips.

Warning

A small peak or shelf appears that may be acceptable but should be checked against goals.

Bad

The transfer shape reveals severe peaking or a rolloff pattern that contradicts the design target.

Common false conclusions

• A normalized curve does not tell you absolute loudness.
• A flat transfer function can still have insufficient sensitivity or max SPL.
• The reference is calculated from the simulated response, not entered as an external target curve.

App behavior notes

• The UI graph id is `transfer-function-magnitude`.
• This graph supports EQ-aware simulation output.