The RHD dual headstage adapter (Part #C3442) connects two RHD headstages to a single SPI cable, enabling high-density recording modules with up to 128 total channels. The adapter is approximately 8.7 cm long and weighs 1.9 g.

An SPI cable should be plugged into the center connector and RHD headstages attached to the left and right connectors, as shown below right. All RHD headstages except the 128-channel headstage are compatible with this device.

Use of this adapter with daisy-chained SPI interface cables exceeding 6 feet (1.8 meters) in total length may require a minor modification of one amplifier board to maintain high fidelity of the digital data. These technical details are discussed in the RHD dual headstage adapter datasheet.