Hotronic AU51 Audio Delay

These are stereo audio delays in 1 RU rack mount packages.   Both are in VG condition, with one having a small defect along the bottom right edge of the front panel, below the power switch (see photos).

The delay time is set using 3 calibrated pots, each introducing 10x the delay of the previous one (1S, .1S, .01S).

This Model, AU51, is an analog only device, although there are no separate specifications for this model.  THe other variations; AU51D, AU51 D-EM will handle Digital and Analog audio, as well as Embedded SDI Audio.  

Please note that the specifications posted may include features that are not available in this base model.

BROADCAST AUDIO DELAY/CONVERTER

Major Features:

l 2 Channel Stereo Audio Delays
l adjustable Delay up to 9.99 seconds
l Peak adjust with LED indicator for each channel
l 20 bit resolution
l Analog Input and Output
l Digital Input and Output (AES/EBU format)
l Accept SMPTE 259M SDI signal
l Digital audio extractor from embedded SDI input signal
l Automatic Audio Format Conversion and simultaneously outputs in analog or digital format
l Synchronized to NTSC or PAL video
l Bypass mode and selectable audio source

The Hotronic AU51 is a 20 bit broadcast quality audio delay that comes in different models with its own unique features.

Model AU51D accepts either analog or digital audio signals and simultaneously output the delay audio in both analog and digital forms. In essence, the AU51D is also a digital to analog audio converter or vice versa. Accepting sampling frequency of 33.1KHz, 44.1KHz, or 48KHz gives AU51D the flexibility to deal with the increasing varieties of digital audio formats exist today. The one truly distinctive feature that separates the AU51D-EM from the rest is the ability to extract the audio signals from the embedded SMPTE 259M SDI signal.

Providing its unique features, the Hotronic AU51 is a natural choice to any studio's audio requirements.

Specifications

Sampling Frequency 33.1KHz, 44.1KHz, and 48KHz (can be synchronized to NTSC or PAL video)
Quantization 20 bits/sample
Frequency Response  20Hz to 20KHz + 0.5 dB
Distortion Less than 0.02% (with 30KHz filter on)
Cross Talk  Better than -80 dB
Head Room 20 dB
Signal to Noise Ratio Greater than 80 dB
Operating Level  +8, +4 or 0 dBu selectable
Maximum Delay 210ms - 9.99 seconds
Analog Inputs XLR connectors  accept +8, +4 or 0 dBu
Digital Inputs XLR connectors BNC (SDI)

Analog Outputs +8, +4 or 0 dBu selectable
Digital Outputs XLR connectors (AES/EBU format)
Synchronizing video signal levels Analog NTSC or PAL 1 volt p-p 75 ohm BNC

Options
AU51 Analog audio delay
AU51D Digital/Analog audio delay and converter
AU51D-EM AU51D plus embedded
SDI signal audio extractor

Physical

Size  19" wide x 1 3/4" high x 17" deep rack Mountable
Power  25W (110V or 220V 50/60 Hz)
Weight  10 lbs.
Ambient Temperature 10°C - 40°C