Simplex 734-052 — factory harness assembly listed by Simplex as the audio bay-to-bay harness.
A large Simplex 4100-series voice system is built in stacked bays, and the audio path has to be carried from the bay holding the audio controller and amplifiers across to the next bay. 734-052 is the pre-terminated cable Simplex supplies for that hop, so the link is made with the right connectors and pinout instead of field-made wiring. A current panel parts list carries the same number under a more generic description.
- 4100U service parts list: Harness, Audio Bay to Bay
- 4100ES service parts list: Harness, Audio Bay to Bay
- 4017ES panel service parts list (Rev. 1, 09/2025): 7 pin harness — long
- Supplied as a finished harness assembly, not bulk cable
- Power and communications bay-to-bay is a different harness, 734-008
- Audio box-to-box, for 4100-0637, is 734-076
The 734- block is dense with near-identical numbers. 734-051 is the SPS/RPS/TPS PCA to PDI harness, 734-050 the battery harness for legacy box installs, 734-053 the tamper switch to IAM harness. Check the parts list for your panel before ordering.
