JBL Professional 5064574 - Crossover/Input Assembly for JBL Control 28-1 (Original OEM Board)

JBL Professional 5064574 - Crossover/Input Assembly for JBL Control 28-1 (Original OEM Board)

JBL part number 5064574 is the original equipment Crossover/Input Assembly ( Crossover/Input Assembly ) used in Control 28-1 installation loudspeakers. This OEM replacement restores the factory crossover and wiring to the system, ensuring phase coherence, protection, and tonal balance identical to those specified by JBL. The assembly integrates the terminal board and filter network of the Control 28-1 (8" 2-way enclosure), and is designed to be reinstalled without modification to the interior of the enclosure. For units that also require replacement of the 70/100 V line transformer, JBL offers a separate part number 5064576 (Transformer, Control 28-1) .

Main features

• Certified OEM Replacement: Original JBL Control 28-1 crossover and input plate; ensures full mechanical and electrical compatibility.
• Crossover network according to specification: 2nd order low-pass filters for LF and 1st order high-pass filters with conjugate modeling for HF, as defined in the model data sheet.
• Integrated input board: screw terminals/speaker terminal block on the same PCB for quick and clean replacement.
• Direct installation: mounts in the original location and connects to the enclosure's internal wiring without the need for adaptation.
• Color compatibility: Valid for black and white (-WH) versions of the Control 28-1 (the plate has no visible finish).

Benefits for service and maintenance

• Restore factory sound: Returns the response, phase and directivity intended by JBL in the Control 28-1.
• Reduces downtime: By including the inlet plate and filter network in a single assembly, replacement is faster.
• Reliability: Being an original part, it maintains the levels of protection and tolerances designed for professional indoor/outdoor use.

Compatibility and mounting

• Compatible model: JBL Control 28-1 (all color variants).
• Not compatible with previous generations ( Control 28 / 28T ) or other sizes in the Control series; those models use different references.
• 70/100 V Transformer: In Control 28-1, the transformer is a separate part. If it is also damaged, the replacement part number is 5064576 .
• Connection: Follow the original cable routing (LF/HF/input). Tighten terminals according to specifications and verify polarity.

Frequently Asked Questions

• Is the line transformer included? No. This assembly is only the crossover network + input board . The Control 28-1 transformer is replaced with part 5064576 (sold separately).
• Does it work with “older” Control 28 or 28T? No. Previous generation Control 28s use other crosses (e.g., 129-20020-01 / 338146-001 ), which are not compatible with 28-1.
• What connectors does the speaker use? The Control 28-1 uses screw terminals suitable for wiring up to 12 AWG (≈2.5 mm²) .

Description for projects

CROSSOVER/INPUT ASSY JBL 5064574 for Control 28-1 . OEM assembly integrating passive crossover network (2nd order low-pass for LF; 1st order high-pass + conjugate for HF) and input plate . Direct replacement in the speaker enclosure. 70/100 V transformer not included (replacement: 5064576 ). Compatible with black and white versions. Intended use: maintenance/repair in fixed installations.