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
570 eur/pair
Gradient 1.1 - 1.2 (paper pulp midrange)
510 eur/pair
Gradient 1.2 - 1.3 (polypropylene midrange)
690 eur/pair
Gradient 2.0 - 2.1 (paper pulp midrange)
630 eur/pair
Gradient 2.2, 2.3 and 3.0
750 eur/pair
