The ES4 system offers sixteen channels of American made, professional quality microphone preamplification and eight line level return channels via a choice of digital transport formats. Each ES4T (transmitter) and ES4R (receiver) can be configured for Cobranet®, or Dante® formats by simply changing the network module in the unit. The exceptional performance, ease of use, and extreme flexibility make the ES4 series products excellent I/O devices for any digital audio network. The typical Whirlwind ES4 system consists of two components: the ES4T transmitter module, which has sixteen balanced mic/line inputs and eight line level outputs. The matching ES4R receiver module has sixteen line level outputs and eight line level inputs. All inputs have variable gain controls and LED level monitoring.