prelulu LISTENING ROOM ENGLISH STUDY
S2 PRO & S2.1 PRO · MULTILINGUAL STUDY

Eight languages.
Forty familiar voices.

The same forty characters, now across eight languages. Matched voices, matched words, and two speech models. Listen first, then reveal the blind review.

20 male characters20 female characters8 languages
—CHARACTERS
—MATCHED PAIRS
—BLIND REVIEWS

Matched inputs.
Reversed listening order.

01 /

Make up your own mind.

Model names and judge scores start hidden. Your picks stay in this browser.

CHOOSE A LANGUAGE

Every card and the summary follow this selection.

02 /

A fair pair.
An honest result.

01

Choose the voices

The same twenty male and twenty female characters from the English study, selected using recorded usage.

02

Hold the inputs still

Each language uses one matched passage combining conversation, emotional delivery, and pronunciation. Both models receive the same reference voice, text, and settings.

03

Listen without labels

Gemini 3.1 Pro hears anonymous A/B samples. Each comparison is repeated in reverse order to expose order-sensitive judgments.

04

Keep the limits visible

One automated judge is not a human preference study. These passages do not establish quality across every dialect or live-call latency, reliability, retention, or conversion.

Study notes & reproducibility
Study report Results CSV Protocol Gallery JSON