Behringer mdx series compressors and limiters behringer mdx4600 p the ehringer multicom pro xl mdx4600 compressor limiter gives you four channels of first class dynamic control in a single rack space p p with a multitude of new features like the advanced programme adaptive expander gate extensive metering plus a variety of configuration options the mdx4600 puts a lot of dynamic processing power in your rack p behringer multicom proxl mdx4600