Salut.
Pas une lubie, ils avaient décidé ça comme ça à l’époque, point.
Peut être "une manœuvre" visant à s’imposer comme standard à coups de systèmes entiers, limitant ainsi les mix de matériels avec d’autres constructeurs.
For most of JBL’s existence, the company has
designed many transducers and systems with a
polarity convention opposite to the rest of the industry.
The typical JBL transducer exhibited a backward
motion of the cone when a positive-going signal was
applied to the red input terminal, and this convention
was normally carried over into systems.This situation began to change when JBL first introduced
systems intended primarily for musical instrument
(Ml) applications. Since these systems traditionally
used l/4’ phone plugs for signal input, there was
no easy way for the user to invert the input signal
polarity. However, there was a need for JBL’s Ml
products to be consistent with the rest of the industry,
since there is considerable mixing and matching of
systems of different manufacturers in the field.
Source:
JBL Technical Notes, Volume 1 Number 12B
Polarity Conventions of JBL Transducers and Systems
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