Samson TXM20 User Manual

knob is in the “12:00” position. Rotating the knob towards 

the right will boost the channel's low frequency response 

at 80 Hertz by 15dB, and rotating it towards the left will 

cut the frequency by 15dB.

The TXM series include several auxiliary signal paths, or 

buses, that can be used to create independent mixes for 

sending to the internal or external effects processors, or 

to an external monitor system. These buses start by send-

ing the signal from each individual channel, which is set 

with one of the auxiliary control knobs. Then, the mix of 

all the channels auxiliary level is ultimately sent to either 

an internal effects processor, or to an output jack to con-

nect to an external effect or monitor system. To help you 

control your effects and monitor mixes, the TXM16 has 

three auxiliary buses, while the TXM20 has four auxiliary 

buses. 

In order to operate your mixer correctly, it is important 

to understand the concept of PRE and POST fader sends.  

An auxiliary bus that is set up as PRE Fader routes, or 

sends, the signal to its output from a point in the chan-

nels’ circuit that is electronically before the channel Fader. 

That means the channel Fader has no effect on the PRE 

aux level. A Pre Fader send is what you want to use for a 

monitor mix, so when the level is changed for the mix in 

the main PA speakers using the channel Fader, the level 

in the monitor set by the aux control knob remains the 

same. An auxiliary bus that is set up as POST Fader routes, 

or sends, the signal to its output from a point in the chan-

nels’ circuit that is electronically after the channel Fader. 

That means that the channel Fader also affects the level of 

a POST aux send. A POST Aux bus is what you want to use 

(almost always) for sending to an effects processor, either 

internal or external.  When using the POST aux sends, 

(while turning the channel Fader up or down) the level of 

effects will track the channel level correctly.

Each of the TXM16 and TXM20’s Mono Input channels 

include an AUX 1 send, which controls the amount of that 

channel’s signal that is sent to the AUX 1 Output. The sig-

nal feeding Aux 1 is sent before, or pre, the channel Fader, 

so the channel Fader has no effect on the Aux 1 level. The 

Aux 1 buss is usually used to create a separate mix for a 

floor monitor system. 
Note: If the AMP MODE switch is set to either MONO - - 

AUX 1, or AUX 1 - - AUX 2, the signal from AUX 1 bus will 

be sent through the Master Aux 1 Send and then directly 

to the internal power amplifier. For more information on 

the POWER AMP MODE switch, see the section "POWER 

AMP MODE Switch” on page 12 in this manual. 

Each of the TXM16 and TXM20’s Mono Input channels 

include an AUX 2 send, which controls the amount of that 

channel’s signal that is sent to the AUX 2 Output. On the 

TXM16, the signal that feeds Aux 2 is sent before, or pre, 

the channel Fader, so the channel Fader has no effect on 

the Aux 2 level. On the TXM20, Aux 2 can be configured 

for pre or post fader send using the PRE/POST switch.  The 

Aux 2 bus is usually used to create a separate mix for a 

floor monitor system, but you can set the Pre/Post switch 

on the TXM20 to Post to use the send as en effects bus to 

an external processor.

Note: If the POWER AMP MODE switch is set to AUX 1 - - 

AUX 2, the signal from AUX 2 bus will be sent directly to 

the internal power amplifier. For more information on the 

POWER AMP MODE switch, see the section "POWER AMP 

MODE Switch” on page 12 in this manual.

The PRE/POST switch is used to select the point that the 

Aux 2 bus uses to send the signal. When the PRE/POST 

switch is set to PRE, the signal feeding Aux 2 is sent before 

the fader, so the channel Fader has no effect on that level. 

This is the normal setting when using Aux 2 as a monitor 

send. When the PRE/POST switch is set to POST, the signal 

feeding Aux 2 is sent after the fader, so the channel Fader 

has an effect on that level, meaning the Aux level tracks 

up and down with the channel Fader. This is the normal 

setting for using Aux 2 as an effects send, since when you 

set the channel louder you normally want the effect to 

get louder.
NOTE: The channel’s EFX signal is sent to the EFX bus from 

a location in the signal path after the VOLUME control. 

The TXM16 and TXM20 provides high quality, 24 Bit digital 

effects, and the level of effects can be set independently 

on each channel. The channel’s EFX knob controls the 

amount of signal that is sent to the EFX bus. The signal of 

the EFX bus is routed to the DSP EFX section for on-board 

signal processing.  On the TXM20 the EFX1 signal can also 

be sent to an external effect device connected to the EFX 

1 SEND jack located on the front panel jack field.

The TXM16 and TXM20 provides high quality, 24 Bit digi-

tal effects, and the level of effects can be set indepen-

dently on each channel. The channel’s EFX (Effects) knob 

controls the amount of signal that is sent to the EFX bus. 

The signal of the EFX bus is routed to the DSP EFX section 

for on-board signal processing. The EFX2 signal can also 

be sent to an external effect device connected to the EFX 

2 SEND jack located on the front panel jack field.

ENGLISH

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