Until now, summing filtered OEM audio signals has involved using products intended for other applications in creative ways (typically involving lots of cables, y-adaptors and other complicated means). Here is a better way...

The CleanSweep® CL-SSI is the industry's first dedicated signal summing interface and is easily configured to merge 2-way or 3-way OEM signals prior to sending them into a CL441dsp for response correction. This makes it the perfect choice for integrating with "premium" OEM sound systems that do not present full-range audio signals.