Specifications

Zaxcom TRX-900LT Series Manual Extended Menu

Dynamics

The Dynamics is a soft knee compressor that is located after the analog to digital converter. The Dynamics

will limit the dynamic range to prevent clipping during occurrences of loud audio.

Dynamics is comprised

of both a compressor and an expander, which operate jointly

. The Compressor in Dynamics can set to

mild or extreme compression and features a soft knee for more transparent operation.

To enter the Dynamics Menu

Press the INC or DEC key - “PARMS” will be displayed on the right.

To move to the next parameter, press the MENU key.

To exit this page, hold the MENU key for 1 second.

Dynamics Parameters

• PARMS(Parameters): OFF / ON: This turns the entire compressor/expander on or off.

• Link L-R: OFF / ON: This links the left and right of a stereo unit. So if one side of the signal needs

compressing / expansion the other side will kick in to match.

• SPEED (Decay Speed) : SLOWEST / SLOW / NORMAL / FAST / FASTEST

Sets the speed in how gradual the decrease of signal level happens immediately after a signal reaches its

peak. This is typically set to FAST.

• ATTACK (Attack Speed) : SLOWEST / SLOW / NORMAL / FAST / FASTEST

Sets the speed in how fast the gain is turned down once the signal exceeds the threshold setting. This is

typically set to FAST.

• CMP RATIO (Compressor Ratio): Valid range: 1.0: to 5.0:1, In 0.1 steps.

The amount of gain reduction is determined by the ratio setting.

A compressor ratio for example of 2.0:1 means for every 1 dB above the compressor threshold the gain

will be reduced 2 dB. A higher ratio setting makes the compressor more aggressive.

• CMP THRESH (Compressor Threshold): Valid range: 0 to –96dB, in 1dB steps.

Sets the level which gain reduction occurs. This is typically set to -12dB from full scale.

• CMP KNEE: (Compressor Soft Knee): Valid range: 0 to 20dB, In 1dB steps.

Sets the compressor's soft knee. A soft knee reduces “softens” the audible change from uncompressed

to compressed, especially for higher ratios where the changeover is more noticeable

• EXP RATIO (Expansion Ratio): Valid range: 1:1.00 to 1:4.00, In 0.01 steps

Sets the expansion ratio. For example a1:2.0 expansion ratio means for every 1 dB below the expansion

threshold the gain will be reduced 2 dB.

• EXP THRESH (Expansion Threshold): Valid range: 0 to –96dB, in 1dB steps.

Sets the threshold above which gain reduction occurs. This is typically set to -80dB.

• REDUCE (Expander Gain Reduction): Valid range: 0 to –36dB, in 1dB steps.

Sets the limit on the amount of gain reduction caused by the expander. This is typically set to -6dB.

• GAIN (Make-up Gain): Valid range: 0 to 30dB, In 1dB steps.

Used to compensate for the gain reduction caused by the action of the compressor. Because the

compressor is reducing the gain (or level) of the signal, the ability to add a fixed amount of make-up gain

at the output is provided so that an optimum level can be used.

Dynamics OFF

When the Parameters are ON you can adjust the

Dynamic Menu

DYNAMICS

DYNAMICS PARMS