Solid State Power Amp Reviews

Manufacturer's Comment

Editor: The lack of performance of the Accustic Arts Mono II power amplifiers was caused by the fact that we unfortunately installed wrong transformers. Instead of using transformers that deliver a voltage of 2 × 54V and 2 × 58V on the secondary side, we installed transformers that deliver a voltage of only 2 × 48V and 2 × 54V on the secondary side. Our final measurement report, which is created for each device that leaves our manufactory, is in agreement with John Atkinson's results. With the right transformers, the Mono II power amplifiers do achieve the values we published on our homepage.

We have been working together with our transformer supplier for nine months to optimize our toroidal transformers and to produce the optimal transformer for all our electronic devices. Many prototypes with different values have been created during this time, and this had led to this mistake. Although the wrong test value was documented, it was not corrected. Our quality control procedure has been changed to address this problem, so this will not happen again. We apologize for this mistake. Thank you for bringing this to our attention.—Jochen Voss, Accustic Arts