Behringer Ultramatch Pro SRC2496 User Manual

ULTRAMATCH PRO SRC2496 User Manual

(18) 

The SAMPLE RATE switch selects the sampling rate to which the input 

signal is to be converted or made available at the outputs. For this purpose, 

the SRC2496 must be set to internal mode, i.e. it has to function as a master 

unit (see sections  

(20) 

 and  

(21)

).

(19) 

The LEDs 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz and 96 kHz read the 

sampling rate selected with the SAMPLE RATE switch. If the sampling rate 

is preset by an external wordclock or generated via the digital input signal, 

the LEDs light up constantly, thus reading the external sampling rate (with a 

deviation of ± 2 kHz). The next value (= deviation of >2 kHz) is displayed by 

one of the LEDs flashing. 

(20) 

The CLOCK switch allows you to select the source determining the sampling 

rate at the digital output of your ULTRAMATCH PRO.

(21) 

The PLL LOCK LED shows you that your SRC2496 is processing properly the 

wordclock signals applied.
The INTERNAL LED lights up when the SRC2496 generates the sampling rate 

by itself (master), which is the preferred mode for the ULTRAMATCH PRO 

acting as an A/D converter.
The EXTERNAL LED lights up when the sampling rate is governed by an 

external wordclock signal. The external mode also allows you to generate 

sampling rates at the output that could not be generated by the SRC2496 

as a master unit.
When the DIG IN LED lights up, your SRC2496 uses the wordclock signal 

included in the digital audio signal fed into the unit. This setting is useful 

if you do not want to convert the sampling rate, but only the format of the 

digital output signal (S/PDIF to AES/EBU or vice versa).

(22) 

The FORMAT switch determines the format of the digital data stream on 

the output side, as defined in the Channel Status data. Available formats are 

AES/EBU and S/PDIF.

(23) 

The LEDs AES/EBU and S/PDIF show the adjusted output format, 

which is present at all three digital outputs. Using an appropriate cable 

(see chapter 5.3.5) you could also route an S/PDIF signal from the XLR 

output to a second unit, in case the RCA output is already in use.

(24) 

Use the WORDLENGTH switch to select the digital word length of your 

choice (16, 20 or 24 bits). 

(25) 

The LEDs 24 BIT, 20 BIT and 16 BIT read the word length selected.

(26) 

The DITHER switch enables/disables the dither function. The corresponding 

LED lights up when this function is active. Here’s a concise explanation 

of the dither function: Whenever analog signals are converted to 

digital (numerical values!), the finite number of digits available for the 

mathematical description of the analog signals (electrical voltages that 

are constant in the time and value domains) inevitably result in rounding 

errors and misinterpretations of the analog signals (quantization errors). 

In particular, signals with a very small amplitude are affected by an audible 

system error known as granular noise. Such errors can be suppressed by 

adding white noise. This type of noise has an exactly defined amplitude 

(minimum amplitude that can be detected only by measuring instruments 

and by no means affects the audio signal) and broadband frequency 

distribution, and is called dither signal. Combine this with the high 

internal resolution of 24 bits, and you can generate an audio signal of 

excellent quality.

Reducing the digital word length (e.g. from 24 bits to 20 bits) also means a 

reduction of the resolution. The resulting misinterpretations, which are more 

likely to result by this word length reduction can be purposefully suppressed 

with the dither function.

(27) 

The EMPH LED lights up when the emphasis bit has been set in the output 

signal. Use the EMPHASIS switch to enable/ disable this function. To avoid 

sound deterioration, the LED in the output section should read the same 

status as the EMPH LED in the input section. In the rare case of a signal 

containing an emphasis bit without any treble boost applied, you can correct 

this here and switch off the emphasis bit (detailed information can be found 

in chapter 3.4).

(28) 

The COPY switch (= copyright) allows you to set the status of the copy bits in 

the transmitted data stream. The LEDs COPY and ORIG inform you about the 

current status of the copy protection:

COPY-LED

on

ORIG-LED

on

COPY-LED

on

ORIG-LED

off

COPY-LED

off

ORIG-LED

off

COPY-LED

off

ORIG-LED

on

Tab. 2.1: Overview of copy bit settings

If both COPY and ORIG light up, you can make one copy only. Subsequently, 

the data will be copy protected. If only COPY lights up, digital copies cannot 

be made. If both LEDs are out, you can make digital recordings without any 

limitations. Press the switch to change the status of the determining bits and 

allow for unrestricted copying. 

(29)

(30)

(31)

(36)

(37)

(38)

(32)

(35)

(33) (34)

Fig. 2.6: Mains connector/fuse holder

(29) 

MAINS CONNECTOR/FUSE HOLDER. Use the power cord supplied with the 

SRC2496 to connect the unit to the mains. Please note the instructions given 

in chapter 1.2. Blown fuses should only be replaced by fuses of the same type 

and rating.