It goes without saying that head amplifiers play a vital role in determining the sound quality of any analog-to-digital converter, and for this reason, we have selected the circuitry used in our PM5000 – the state-of-the-art analog mixing console – for the AD8HRs microphone pre-amp design. In order to achieve immaculate sound reproduction through 96kHz processing, the finest available parts have been carefully selected. Whats more, strict and impartial listening tests have been carried out exhaustively by many top professionals in order to perfect the high-grade design of this eight-channel AD converter and to ensure that only the input signal – with all of its most delicate nuances – will be heard.
The AD8HRs mic pre-amp can be remotely controlled in steps of 1 dB from digital mixing consoles such as the DM2000 and DM1000, and with a high pass filter and a phantom power supply integrated into each channel, both the filter and phantom power can be turned on and off by remote control, as can the filters cut-off frequency. This Head Amp Remote Control function makes it possible for the AD8HR to be used as a stage box. In addition to the many advantages that this offers, digital connection of the AD8HR and DM2000 using an AES/EBU cable reduces the requirements for analog wiring to the bare minimum. This in turn ensures that soundquality deterioration can easily kept in check and that wiring layouts can be simplified. Moreover, this feature also allows up to 255 AD8HRs to be daisy-chained.
Packaged in a space-saving 1U case, the AD8HR boasts a full range of analog and digital interfaces. And with its integrated high-pass filters and phantom power supplies, this AD converter features all of the functions required for effective and flexible live mixing.
Moreover, the front panel and its controllers have been designed with full consideration given to the speedy operation and instant recognition required in live situations.
Each of the rear panel's eight inputs features an XLR connector with a latch lock; furthermore, a pair of D-SUB25 pin AES/EBU digital output terminals is fitted as standard and with BNC terminals provided for word clock input and output, the AD8HR covers every base in terms of digital connection.
Using the two D-SUB25 pin AES/EBU digital output terminals to full advantage, the input signal can also be separated into two lines for parallel output, allowing such applications as one line for FOH and the other for monitoring or recording. In addition, remote control can be realized using an RS422 or a switchable PC/RS422 nine-pin terminal.
- Frequency Response (INPUT 1-8 to DIGITAL OUT 1-8):
- * 20Hz-20kHz, @ 44.1kHz, 48kHz -3, +1dB, GAIN -62dB
- * 20Hz-40kHz, @ 88.2kHz, 96kHz -3, +1dB, GAIN -62dB
- Total Harmonic Distortion:
- * Less than 0.05%, -1dBFs output @ 1kHz Gain : -62dB
- * Less than 0.01%, -1dBFs output @ 1kHz Gain : +10dB
- Equvalent Input Noise: Less than -128dB (Rs=150., GAIN-62dB)
- Dynamic range: Greater than 110dB (typical), GAIN +10dB
- Crosstalk: Less than -80dB between adjacent channels @1kHz
- Phantom power: +48V
- Sampling rate: 44.1kHz, 48kHz, 88.2kHz, 96kHz
- Power requirements: U.S.A. & Canada 120V AC, 60Hz
- Power consumption: 35W
- Dimensions (W x H x D): 18.9" x 1.7" x 13.9" (480 x 44 x 353.5 mm)
- Weight: 11 lbs. (5 kg)
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