Devialet Phantom Reactor 900 is a active bookshelves speaker that cost around 1200CHF for a each . Reference level is normalised to 0.0dB computed over the frequency range [300.0Hz, 10000.0Hz]. Frequency deviation is 2.3dB over the same frequency range. Link to original Review: asr review. Links to other reviews: tnw review . Quality of the measurement data is low.