During maintenance, the foam surrounds of the midrange drivers and woofers are replaced. The tweeters are checked and replaced if necessary. Likewise, the crossover and other electronics are checked. Finally, the speakers are tested. In the 1.3, 2.2, 2.3 and 3.0 models and in the newer 1.2 models, the white mid-range polypropylene cone must also be replaced.
The prices are as follows:
Gradient 1.0
560 eur/pair
Gradient 1.1 - 1.2 (paper pulp midrange)
490 eur/pair
Gradient 1.2 - 1.3 (polypropylene midrange)
680 eur/pair
Gradient 2.0 - 2.1 (paper pulp midrange)
620 eur/pair
Gradient 2.2, 2.3 and 3.0
740 eur/pair