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23

Applications

Here are four suggested applications for the PL 2404; bear in mind that your particular circumstance may dictate
changes in these suggested signal connections and routings.

Application 1 - Using The PL 2404 As A Recording Mixer

The PL 2404 is optimized for use as a recording mixer with multitrack digital or analog recorders. As shown in the
illustration below, microphones and line level signals are connected to various channel inputs. Signal processors are
connected to Aux sends and returns and to channel inserts as required. The Control Room outputs are connected to a
power amplifier driving studio monitors. The Main outputs are connected to the inputs of a two-track or DAT recorder,
with the outputs of the two-track or DAT recorder connected to a PL 2404 stereo channel. The four Bus outputs are
connected to the inputs of a multitrack recorder, with the multitrack outputs connected to two PL 2404 stereo channels.
During mixdown, those channels carrying the multitrack outputs are routed to bus 1/2 (via their channel “Mute 3/4”
switches), with buses 1 and 2 routed to the Main L/R outputs (by pressing in their Bus “L/R” switches). To listen back to
the mix, the channel carrying the two-track outputs is routed to bus 3/4 (via its channel “Mute 3/4” switch); then simply
connect buses 3 and 4 to the Control Room outputs by pressing in their Bus “L/R” switches.

CASSETTE or DAT

+15db

0

-15db

0

+15db

-15db

-15db

+15db

0

+15db

-15db

0

SAMSON

SIGNAL PROCESSOR

SIGNAL PROCESSOR

SERVO - 240

SAMSON

L

R

MIDI KEYBOARD

L

R

DRUM MACHINE

MIDI TONE GENERATOR

L

R

MULTITRACK

Ring

Tip

PL 2404 24 CHANNEL PROGRAM STEREO / LINE MIXER

SAMSON

3

1

2

4

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

BUS OUTPUTS
UNBALANCED

<75

Ω

+4dBu

R

CONTROL ROOM

BALANCED <75

Ω

+4dBu

LINE INPUTS - BALANCED 10K

Ω

+4dBu

S/N

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

!

115V - 60 Hz 25W

POWER
RATING

AVIS:

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

DO NOT EXPOSE THIS EQUIPMENT

TO RAIN OR MOISTURE

MAIN

BALANCED <75

Ω

+4dBu

LEFT / MONO

RIGHT

1

2

3

4

1

2

3

4

1

2

3

4

BUS INSERTS

UNBALANCED <75

Ω

+4dBu

MIXER LINKING

AUX SENDS

UNBALANCED <75

Ω

+4dBu

AUX RETURNS

STEREO INPUTS

UNBALANCED 10K

Ω

+4dBu

1

2

3

4

INSERT

L

1

2

3

MIC 1

1

2

3

MIC 3

ON

OFF

~AC INPUT
115V, 60Hz

25W

TRS

STEREO INPUT

TIP = LEFT

RING = RIGHT

SLEEVE = COM

TRS

BALANCED

TIP = HI

RING = LO

SLEEVE = COM

TRS INSERT

UNBALANCED

TIP = RETURN

RING = SEND

SLEEVE = COM

XLR

BALANCED

3 = LO

2 = HI

1 = COM

+4

-10

0

−50

+4

-10

0

−50

POWER

FUSE

1A/250V

R

L

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Summary of Contents for PL2404

Page 1: ......

Page 2: ...ounding Techniques 15 Busing Submixing and Channel Muting 17 Using the Balance Control 18 Using Equalization 19 Using Aux Sends and Returns 20 Using Channel Inserts 21 Using PFL AFL 22 Applications Notes 23 Using The PL 2404 As A Recording Mixer 23 Using The PL 2404 As A Main Live Mixer 24 Using The PL 2404 As A Keyboard Submixer 25 Linking The PL 2404 With Other Mixers 26 Appendix A Block Diagram...

Page 3: ...equire servicing a Return Authorization number RA is necessary Without this number the unit will not be accepted Please call Samson at 1 800 372 6766 for a Return Authorization number prior to shipping your unit Please retain the original packing materials and if possible return the unit in its original carton and packing materials PL 2404 Features PL stands for Program Line and the name describes...

Page 4: ...t EQ while AFL enables headphone monitoring of individual channels post fader and post EQ with the channel in its proper stereo position Both types of solo function are non mix destructive in that they do not affect the signal being output either by the Main Bus or Control Room outputs A flexible front panel metering system includes a ten segment level meter and allows you to view at a glance the ...

Page 5: ...5 15 0 10 0 15 15 0 15 15 0 10 0 10 0 15 15 0 10 0 15 15 0 15 15 0 10 0 10 0 15 15 0 10 0 10 0 AUX RET 2 10 0 AUX RET 3 1 2 3 4 10 0 AUX RET 4 1 2 3 4 1L 2R 3L 4R 10 10 10 0 0 0 0 10 0 10 0 0 10 0 10 0 MUTE 3 4 MUTE 3 4 MUTE 3 4 MUTE 3 4 MUTE 3 4 MUTE 3 4 MUTE 3 4 MUTE 3 4 MUTE 3 4 MUTE 3 4 MUTE 3 4 10 0 10 0 3L 4R 1L 2R MID LOW HIGH MID LOW HIGH MID LOW HIGH MID LOW HIGH MID LOW HIGH MID LOW HIGH...

Page 6: ...is determined by the position of the channel s Level control its EQ settings the position of the main Level control and in the case of channels 1 and 3 Trim control For more information see the Using Auxiliary Sends and Returns section on page 20 3 Solo On Off switch When pressed in the channel is soloed in headphones only and only when the Solo Main switch in the PL 2404 main section is in the So...

Page 7: ...b as described in 5 above In practice you will use the Level controls to continuously adjust the loudnesses of the various signals being blended together by the PL 2404 The 0 2 o clock position of the knob indicates unity gain no level attenuation or boost Moving the knob counterclockwise from the 0 position towards causes the signal to be attenuated at the very bottom it is attenuated infinitely ...

Page 8: ... Bus 3 4 jacks as well as if the Bus L R switch is pressed in the Main and Control Room output jacks If you set the Bus 3 4 faders all the way down to their position this switch can be used for selective muting of Aux returns See the Busing Submixing and Channel Muting and Using the Aux Sends and Returns sections on page 17 and page 20 in this manual 3 Headphone Level This knob sets the level of t...

Page 9: ...he very bottom it is attenuated infinitely in other words there is no sound Moving it clockwise from the 0 position towards 10 causes the signal to be boosted by up to 10 dB For more information see the Setting The Correct Gain Structure section on page 13 in this manual 10 Control Room Level This knob determines the signal level of the rear panel Control Room output allowing independent monitorin...

Page 10: ...necting the PL 2404 section on page 10 for more information 6 Control Room Out L R In recording applications these will normally be connected to a power amplifier and loudspeakers The Control Room out jacks are electronically balanced so you should use balanced three conductor cabling and 1 4 TRS plugs wherever possible unbalanced two conductor plugs can also be inserted into these outputs but you...

Page 11: ... see the Using the Balance Control section on page 18 for more information The Connecting the PL 2404 section on page 10 provides more information on how best to use channel inputs WARNING Do not connect the channel 1 or 3 line input if you already have something connected to that channel s microphone input see 7 above these channels are designed to accept only one source or the other 10 Channel I...

Page 12: ... equipment turning the PL 2404 off last Try to use balanced connectors and cabling wherever possible These kind of connections do a better job of rejecting extraneous noise and hum and generally provide a cleaner signal Although the PL 2404 will accept unbal anced connectors throughout it specifically provides electronically balanced inputs for all line inputs and for its Main and Control Room out...

Page 13: ...hen be panned using the Balance control and routed to all four Aux sends See the Using the Balance Control and Using Aux Sends And Returns sections in this manual pages 18 and 20 for more information Signals that are likely to require in line processing such as compression limiting or expansion noise gating should be connected to channels 1 4 since these channels provide an insert connection Inser...

Page 14: ...hat is not connected to loudspeakers 3 Next make the signal input connections to the mic or line inputs of the various channels WARNING When using channel 1 or 3 do not connect its microphone input and line input simultaneously these channels are designed to accept only one source or the other 4 Turn all channel Level controls fully counterclockwise to their setting bring all four bus faders compl...

Page 15: ...knobs and all Aux return Level knobs to their fully counterclockwise position e Turn on all devices connected to channel line inputs and Aux returns and set their output level controls to unity gain or if there is no unity gain indicated on their output control to maximum If you ve got outboard effects processors con nected to Aux returns make sure they are sending completely wet processed signal ...

Page 16: ...e routed to Aux 1L and Aux 3L while the even numbered right input can only be routed to Aux 2R and Aux 4R when only the odd numbered left input is connected the signal can be routed to any of the four Aux sends Then play the instrument or sing into the microphone connected to that channel Adjust the input levels of connected outboard effects processors so that their meter shows incoming signal nor...

Page 17: ... expense Three prong plugs such as the one used by the PL 2404 should always be used as is don t use adapters to lift the ground unless you re using a star ground network see below If you hear hum or buzz from a device that uses a two prong plug or an external two prong AC DC adapter you can try revers ing the plug in the socket If that doesn t work you may need to physically ground that device s ...

Page 18: ...ree prong AC connectors so there is the possibility of danger if it is done incor rectly We strongly recommend that you contract with a qualified professional to carry out this or any kind of electrical work Another less common problem you may encounter is that of oscillation a ringing tone which apart from being annoying is potentially dangerous to your speakers This is generally caused either by...

Page 19: ...that you can use each bus to set up a submix within your overall mix For example let s suppose that you re using the PL 2404 to do live sound and you have eight microphones on the drum kit separate mics for the bass and snare drums as well as for the hi hat another mic for each of three tom toms and an overhead pair for picking up cymbals To get all this signal into the PL 2404 you re going to hav...

Page 20: ...mpletely hard left or right since some members of the audience not seated in the center of the venue may miss some signal alto gether In these circumstances you re best to use modest panning with signals routed no further than the 9 o clock and 3 o clock positions In channels where both the odd numbered left and even numbered right inputs are connected the odd numbered left input signal is automat...

Page 21: ...ects both the odd and even numbered inputs the same way although the two signals remain separate In most instances the best way to approach equalization is to think in terms of which frequency areas you need to attenuate as opposed to which ones you need to boost boosting a frequency area also has the effect of boosting the overall signal too much EQ boost can actually cause overload Be aware of t...

Page 22: ...ese allow you to return signal from outboard devices in stereo pairs In practice you ll probably want to use the Auxiliary returns to bring in signal from connected effects processors Signal arriving at the left input is automatically panned hard left and signal arriving at the right input is automatically panned hard right The PL 2404 Aux return jacks are unbalanced stereo inputs with the tip car...

Page 23: ...ear panel accept 1 4 TRS plugs with the ring carrying the send signal and the tip carrying the return signal this will normally be connected to a Y cord see the Connecting The PL 2404 section on page 10 in this manual for a wiring diagram This configuration is sometimes known as an effects loop since the signal is sent and returned over the same cable If nothing is plugged into the channel insert ...

Page 24: ...oth inputs panned hard left and right if only the odd numbered input is connected you ll hear the signal monophonically Therefore you may in some circumstances prefer to use AFL mode which provides in context soloing When the PL 2404 is in AFL mode and a channel Solo switch is pressed in the post fader post EQ signal of that channel alone is routed to the headphone output if the Solo Main switch i...

Page 25: ...ing in their Bus L R switches To listen back to the mix the channel carrying the two track outputs is routed to bus 3 4 via its channel Mute 3 4 switch then simply connect buses 3 and 4 to the Control Room outputs by pressing in their Bus L R switches CASSETTE or DAT 15db 0 15db 0 15db 15db 15db 15db 0 15db 15db 0 SAMSON SIGNAL PROCESSOR SIGNAL PROCESSOR SERVO 240 SAMSON L R MIDI KEYBOARD L R DRUM...

Page 26: ...5db 15db 0 SAMSON SIGNAL PROCESSOR Ring Tip SIGNAL PROCESSOR SERVO 240 SAMSON L R L R L R PL 2404 24 CHANNEL PROGRAM STEREO LINE MIXER SAMSON 3 1 2 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 BUS OUTPUTS UNBALANCED 75Ω 4dBu R CONTROL ROOM BALANCED 75Ω 4dBu LINE INPUTS BALANCED 10KΩ 4dBu S N CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN 115V 60 Hz 25W POWER RATING AVIS RISQUE DE C...

Page 27: ... MPL2242 MPL2242 PL 2404 24 CHANNEL PROGRAM STEREO LINE MIXER SAMSON 3 1 2 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 BUS OUTPUTS UNBALANCED 75Ω 4dBu R CONTROL ROOM BALANCED 75Ω 4dBu LINE INPUTS BALANCED 10KΩ 4dBu S N CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN 115V 60 Hz 25W POWER RATING AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOIS...

Page 28: ...US INSERTS UNBALANCED 75Ω 4dBu MIXER LINKING AUX SENDS UNBALANCED 75Ω 4dBu AUX RETURNS STEREO INPUTS UNBALANCED 10KΩ 4dBu 1 2 3 4 INSERT L 1 2 3 MIC 1 1 2 3 MIC 3 ON OFF AC INPUT 115V 60Hz 25W TRS STEREO INPUT TIP LEFT RING RIGHT SLEEVE COM TRS BALANCED TIP HI RING LO SLEEVE COM TRS INSERT UNBALANCED TIP RETURN RING SEND SLEEVE COM XLR BALANCED 3 LO 2 HI 1 COM 4 10 0 50 4 10 0 50 POWER FUSE 1A 250...

Page 29: ...L R S O L O L S O L O R AUX RETURN 1 4 AUX RET AUX RET 1 2 3 4 4db 2Kohm LOW MID HIGH LOW MID HIGH LEVEL BUS 1 0dB SUM 0dB SUM 0dB 0dB SUM SUM BUS OUT 1 MAIN LEVEL MAIN OUT LEFT L R L R BUS OUT 2 BUS OUT 3 BUS OUT 4 BUS INSERT 1 BUS INSERT 2 BUS INSERT 3 BUS INSERT 4 UNBALANCED 10K ONCE BALANCED 75 Ohms 4dB BALANCED 75 ONCE CONTROL ROOM RIGHT CONTROL ROOM LEFT 4dB UNBALANCED 75 4dB OdB 230V FUSE P...

Page 30: ...02 Line in to Aux send Less than 0 02 Line in to Control Room out Less than 0 02 3 Maximum Gain Mic in to Main out 75 dB Line in to Main out 85 dB Line in to Control Room out 35 dB Aux return to Main out 35 dB Line in to Aux send 24 dB 4 Crosstalk Ch to Ch 1 kHz with 30 kHz LPF 70 dB 5 Residual Noise with 30 kHz LPF all faders down Main out 96 dB Aux send 87 dB Control Room 96 dB 6 Headphone Outpu...

Page 31: ...velength for Samson Technologies Corp Copyright 1996 Samson Technologies Corp Printed March 1996 Samson Technologies Corp 575 Underhill Blvd P O Box 9031 Syosset NY 11791 9031 Phone 1 800 3 SAMSON 1 800 372 6766 Fax 516 364 3888 ...

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