The System Hub is the same as the Akurate DSM, except does not have headphone nor analog speaker outputs. It is analog in only and Exakt out only.
Works with Linn Exakt input speakers - the Linn 520, 530, Akubarik Exakt, Akudorik Exakt and Klimax Exakt speakers.
Works with Linn analog speakers if you have an Exaktbox as well. The Akurate System Hub feeds the Exaktbox which feeds/powers the Linn analog speakers. This is a good upgrade for people who have existing Linn speaker because it gives you both Exakt and Aktiv upgrades.