not
reset the converter digital circuitry nor does it change the sample rate back to power up defaults.
Each time you power up the MADA-2, the “Over” LED will light up. Press the reset switch to turn-off
the Over LED.
External Sync Input:
Your MADA-2 is supplied with an External Word Clock Sync function External Sync is selected by
pressing the “Select” switch until the WC external sync LED is lighted. If no valid WC is detected at
the WC Input BNC connector, then the red SYNC LED will be lighted. Once a valid WC is applied to
the BNC connector, the red LED will turn off, indicating that the MADA is locked to the external WC.
The MADA-2 should lock within one second of receiving a valid WC sync input signal. A wide range of
WC input frequencies can be used, including vari-speed WC signals.
The WC sync input level should be TTL compatible and needs to be terminated with a 75 ohm resistor.
The MADA-2 WC input is a high impedance input. This allows several units to be feed sync input with
from one single WC source. To daisy-chain several units, you will need to use BNC Tee connectors on
each unit. A 75 ohm terminator should be connected at the Tee connector of the very end of the chain.
Analog Inputs:
Analog inputs are provided on rear panel mounted XLR connectors. The MADA-2 can accept either
balanced or unbalanced input signals.
Unbalanced signals result in a 6 dB lower headroom
. The XLR
connectors are wired for pin #2 = + input, and pin #3 = - input signal polarities. The input impedance of
analog inputs is approximately 3k ohm balanced.
Level Calibration:
Unless otherwise requested when your unit was ordered, the MADA-2 is calibrated so that a 0 (775
mv) dBu analog input level produces –18 dBFs digital output level. There are four sets of jumpers
located on the MADA board inside the MADA-2 that will allow you to change the level calibration for
the AD section. All four jumpers must be set for the same level calibration.
Digital Outputs:
There are two digital outputs available with the MADA-2. One is an AES/EBU (AES3) 110 ohm digital
output on a rear mounted XLR connector. The other is a 75 ohm SPDIF digital output on a rear mounted
RCA connector. These digital outputs are isolated from each other and they may be used
simultaneously.
Digital to Analog (DAC) Section Description:
The DAC section MADA-2 is designed for the most demanding applications, where capturing musical
performances with accuracy and honesty is required. The MADA-2 accepts digital inputs with sample
rates from 44.1k to 192k Fs. The MADA-2 has AES3 (AES/EBU) 110 ohm on an XLR connector and
SPDIF 75 ohm RCA inputs. Input selection is via a front panel push button switch with LED
indicators showing which input is selected. Other front panel LED indicators show input fault
condition and SCR lock status.
Level Calibration:
Unless otherwise requested when your unit was ordered, the MADA-2 is calibrated so that a -18 dBFS
digital input level produces a 0 dBu (775 mV) analog output level. There are two trim pots located on
