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The Blue Box (1986) is a two-way multi-purpose sound reinforcement system.
The system consists of one SA 15" with SA Ribbon Compact Driver, together with a PMS-5000 amplifier module.
Since its introduction the Blue Box went through many changes; Starting with the SA8520, the BB has seen all Ribbon Compact Drivers, SA8525 (1987), SA8526 (1990) and SA8535 (1993).
Also the woofer changed from SA1503 to SA1513 (1992).
The cabinet shape went from (type of) wedge-shaped to deep rectangular (1987) to small rectangular (1990).
The PMS 5000 module has two different AC connections; The initial NL AC power plug was changed into a fixed AC cord (1988).
The foam front was changed into the steel grill frame in 1990.

In the year 1988 Stage Accompany produced for Philips a OEM version of the Blue Box.
Philips sold the Blue Box under the Philips part number VN3100-25 (VN3100|25).
The VN3100-25 was equiped with a SA1503 woofer and a SA8525 Ribbon Compact Driver.
The enclosure, LED-panel (with Philips logo and part number), woofer and horn were all painted black.