The Quadra digital wireless monitor (IEM) system comprises the M4R ($1,765) beltpack diversity receiver and the M4T ($2,875 MSRP) half-rack transmitter, and features digital RF modulation, two or four channels of 24-bit/48kHz digital audio, analog or digital inputs, and a mixing interface for users. The Quadra system operates in the license-free ISM (industrial, scientific and medical) band between 902 and 928 MHz, and has a throughput latency of 1 ms for the analog inputs and less than 0.5 ms for the digital inputs.
The M4R diversity beltpack receiver features a user-friendly interface with a high-resolution, backlit LCD and membrane switches. A 4-channel mixer enables the performer to tailor the mix in real time, based on what is sent to the transmitter from the monitor console. Several channel setups and knob configurations are available, providing users with a variety of choices as to how the system operates. The M4R runs for six hours on three alkaline AA batteries.
The M4T half-rack transmitter features transmission power of 200 mW for extended operating range. Locking XLR connectors facilitates up to four channels of either analog or digital (AES/EBU) audio sources to be applied to the transmitter. A large, high-resolution, backlit LCD and large membrane switches provide an intuitive interface. The included hardware supports rack-mounting of two M4T units together in a 1RU configuration. A USB jack provides for future firmware updates in the field. The M4T operates on AC mains power, avoiding the use of a wall-wart.