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The Obelisk 'X2' outboard power supply (in fact, a dual-mono power amp PSU) when added to the Obelisk 'Si', ups the ante to a full 50wpc, while allowing the original on-board power supply of the Obelisk 'Si' to dedicate itself entirely to its preamp section.
In other words, with the addition of this single device, the Obelisk 'si' evolves into a fully-fledged dual-mono pre/power combination.
It is a substantial technical upgrade, and consequently a large leap forward in sonic performance: it catapults the single-box integrated Obelisk 'si' into a much higher league.
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