XTE Electronic AMA 3008 Manuale utente

UK_AutoMixers_V2.doc Rev 2.0 1

PUBBLIC ADDRESS SERIES

PROFESSIONAL AUTOMATIC MIXER

AMA 3150 AMA 3250

AM 3000 AM 3008

Owner’s Manual

UK_AutoMixers_V2.doc Rev 2.0 2

PUBBLIC ADDRESS SERIES

PROFESSIONAL AUTOMATIC MIXERS

AMA 3150 – AMA 3250 – AM 3000 – AM 3008

PRODUCT DESCRIPTION

Automatic mixer considerably improves the audio quality in all that applications of voice survey in

which more microphones are used. Softening microphones when they are not in use, an automatic

mixer helps to minimize background noise and reverberation, supplying a clearer and more

intelligible audio.

The mixer only starts relevant microphones in just 4 thousandths of a second.

Moreover, there is no need of specific microphones: mixer works with any kind of microphone or

professional radio microphone. XLR connectors make microphone connection quick and simple.

The starting threshold is automatically.

These features guarantee that the undesired background noise would be at minimum and that the

speaker voice instantly starts one microphone only.

When more than 8 microphones are necessary the Automatic Mixer Expansion AM 3008 is used.

It is connected to amplified mixer and mixer’s connector (LINK IN) by the special cable supplied

with the equipment (Patch cord CAT 5 FTP 8 pin whit TJ45).

The Expansion has 8 electronically balanced micro phonics inputs.

With the possibility to connect up to 2 expansions in cascade, could have a max of 24 micro

phonics inputs available.

This unit is therefore the extension of AMA 3150, AMA 3250 and AM 3000 units of which it

maintains the main features, advanced functions and possibility of internal modifies. (see under

Main Features and Installation)

MAIN FEATURES

AMA 3150, AMA 3250, AM 3000 and AM 3008 is equipped with a whole of features, which help, in

adapting mixer to particular applications.

• 8 electronically balanced microphone/line inputs (internal setting) characterized by:

a. 3 band adjustable equalizer for each micro phonic channel

b. Led for channel activation indication

c. Led for channel overload indication

d. Channel Gain control

e. Arrangement to insert transformer balance (optional)

f. 48 V phantom supply for each micro phonic channel

g. High-pass filter which could be excluded

• 2 selectionable CD/TAPE inputs with volume control, treble and bass tunes

• 10-band main equalizer on microphone, which could be excluded

• Main level indicator

• Main Master volume

• Input/output for external effect (antilarsen, etc.)

• Radio frequency-immune components and chassis.

• The whole electronic circulation has quality and safety features in working; it has an “earth-lift”

switch (on the back).

UK_AutoMixers_V2.doc Rev 2.0 3

• INTERNAL MODIFIES for particular functions:

a. Locked priority assignation to one or more microphones.

b. Exclusion possibility of MUTE and priority functions, for each input independently.

c. TAPE output whit direct inputs signal or post master selection.

• ADVANCED FUNCTIONS for flexible applications:

a. PRE OUT output (internal setting) could supplies the signal pre/post MASTER control and

pre/post equalizer.

b. Audio power outputs for loudspeakers are arranged for connection to constant voltage lines

50V, 70V, 100V and/or to constant impedance lines 4ohm.

c. Selection of 4 output lines of loudspeakers

d. Input (LINK IN) to connect up to 2 microphones expansions. TOTAL EXTENTION

CAPABILITY UP TO 24 MICROPHONES WITH AM3008 EXPANSION.

e. Output (LINK OUT) to connect AM 3008 Expansion to AMA 3150, AMA 3250 and AM 3000

(AM 3008 only)

• OPTIONAL ADVANCED FUNCTIONS

a. C 656 OPTIONAL REMOTE CONTROL CARD

Optional cards for independent volume remote control for each channel and for the master.

This card could have ON/OFF or volume function.

b. C 718 OPTIONAL CARD FOR LOGICAL FUNCTIONS

Optional card whit remote control connector for the logic circuits of each channel.

Optional card for logic functions selectionable by dip-switch on the back panel

I. FILIBUSTER: the first active microphone closes all the others

II. OVERRIDE: opens all the microphones

III. NOM: set On or OFF the NOM circuit

IV. LAST ON: the last active microphone remain open

FLEXIBLE FOR ANY APPLICATION

The Automatic Mixer could have various uses for sound enhancement, recordings and broadcast.

In each multi-micro phonic application, in which single speaker’s voice must be superior to

environmental noise and reverberation, AMA3150 supplies a clearer and more intelligible audio.

POSSIBLE USES

• Conferences

• Places of worship

• Hotels sound enhancement

• Court halls

• Audio conferences

• Hotels

• Schools

• Airports

• Offices

• Supermarkets

• Restaurants

• Motorway restaurants

• Auditorium

• Industries

• Gyms

UK_AutoMixers_V2.doc Rev 2.0 4

WHY AUTOMATIC MIXING IS NECESSARY

Installations with more microphones have always given several problems to audio technicians.

Using few microphones, some speakers have a clear audio, while others seem to be “far away”. If

too much microphones are used, the background noise is higher and it makes difficult listening to

the speakers.

A single speaker’s voice often reaches and is shot by more microphones and that causes a poor

audio quality. Since it is difficult choosing an exact no. of microphones to cover an area without

superimpositions, somebody should open and close microphones according to who is speaking.

This requires not only a great ability, but also a stressful quantity of work.

Use an automatic mixer.

HOW DOES AN AUTOMATIC MIXER WORK

Automatic mixing “opens” microphones when they are in use and it “softens” them when they are

not used.

Minimizing the number of simultaneously working microphones, that reduces the whole

background noise supplying a clearer and more intelligible audio.

Note: microphones opening, instead of turning on and off, gives a softer and more natural starting.

Softened microphones, even technically working, are quite “low” to seem closed.

APPLICATIONS WITH PA SYSTEMS

This kind of applications requires more than the others the automatic mixing. The ground is the

feedback, the high-frequency sound, which occasionally is heard from loudspeakers; each open

microphone increases feedback possibility. More microphones are open at the same time, more it

is likely that feedback happens; automatic mixers reduce this problem by keeping a minimum no.

of open microphones.

This unit includes a circuit (NOM) reducing of 3 dB the total gain of the system, any time the open

microphone no. doubles (i.e. from 1 to 2, from 2 to 4 and from 4 to 8); this keeps PA system under

the level in which feedback could happen.

POWER SUPPLY

The unit is expected to work with 230 VCA – 50/60Hz distribution system.

In case of power dysfunction, check the outside protection fuses (230 V~21 of fig. 1)) and

eventually replace them with others of same calibration; if one of them burns out immediately, do

not go on and have check the unit by qualified personnel.

Take away plug from 230 VCA electric power socket always, before removing fuses and, in any

case, open the unit framing.

UK_AutoMixers_V2.doc Rev 2.0 5

INSTALLATION

Advanced functions

• Commutators (19 of fig. 1a) enable loudspeakers to be silenced and could activate 4 different

zones separately.

• LINK IN input (34 of Fig. 1) is used to increase the disponibility of number of the microphones

connecting an expansion by one cable (Patch cord CAT 5 FTP 8 pin whit RJ45)

• LINK OUT (37 of Fig.1c) is used to increase the disponibility of number of the microphones

connecting the expansion by one cable (Patch cord CAT 5 FTP 8 pin whit RJ45)

• On the back panel, each microphonic input is arranged for insertion of 48V phantom power

supply and of high-pass filter through dip-switch (25 of fig. 1).

• There are JUMPER on the Master module for internal setting of PRE OUT output pre/post

Master and pre/post the equalizer (JP16, JP17, JP18 of FIG.5).

• Micro/line selection whit internal setting by jumper on the input module, jumper on=micro,

jumper open=line (JP7 of FIG.5)

• INTERNAL MODIFIES

Any modify has to be made in an authorized assistance centre or in factory directly.

• On each microphonic channel is possible to active the mute function of priority on the

remaining microphones. Each MUTE selected channel has the priority on the other

microphonic channels, which are going to be closed even if a speaker is talking. Also is

possible to set a channel in order than it can't be silenced by the MUTE function of the

other priority micro.

• TAPE REC output supplies the direct signal of the inputs without the eventually settled

tone corrections, or the post master signal, that is whit all the corrections settled by the

tone and level controls.

• OPTIONAL CARDS

Their insertion has to be made in an authorized assistance centre or directly in factory

• On each channel and on master there is arrangement for volume remote control card

insertion (Internal setting FIG.5), that connection has to be made by shielded cable

connect to the connector (32 of fig.1), without section limitations for distances up to 150

mt.

In remote place is possible to use potentiometer volume control or a switch for the

ON/OFF function. For connector connections see Fig.2

• The logic functions card has 4 selectable programs by the dip-switch (33 Fig.1).

a. FILIBUSTER: gets on this function when any microphone get activated prevent the

other microphones from get active till the speaker do a pause so long than the

relative microphone get deactivated. So the speaker than speaks can not be

interrupted.

b. ALL OVERRIDE: gets on this function all inputs are get actived, therefore the

microphonic signals are amplified as a not automatic mixer

c. NOM: set ON or OFF the NOM circuit that reducing the gain according to number of

open micophone.

d. LAST ON: blocking of the last microphone that maintain it active till it is not replaced

by the activation of another microphone. This function guaranties then environmental

acoustics is always present. Without this function, a long waiting in the conversation

causes the deactivation of all microphones; with the result of loses audio signal

effect.

UK_AutoMixers_V2.doc Rev 2.0 6

• The remote control card of logic circuits consents to extend the adjustment options and

opportunity of installations. The logic circuits could be used for different applications,

from simple ‘cough’ push button to complex environment systems adjusted by

computer.

a. GATE: when the respective audio channel is get activated by audio signal at its

input, it turn at ‘low’ logic condition.

b. MUTE: forced deactivation of channel when a ‘low’ logic signal is applied.

c. OVERRIDE: forced activation of channel when a ‘low’ logic signal is applied. MUTE

is priority when MUTE and OVERRIDE functions are activated.

d. LOGIC GROUND: logic ground is different to the audio ground. Connect at this pin

all logic ground points, supply’s ground of outside logic circuit enclosed. For avoid

‘click’ in commutation condition, do not connect the logic ground to the audio ground

or chassis or rack ground. The logic circuits are directing by multiple connector

DB25 on back panel ( 32 of Fig.1). The pins connections are in the following table.

LOGIC CIRCUITS CONNECTIONS (32 of Fig.1)

LOGIC FUNCTION INPUT CHANNEL CONNECTOR PIN NUMBER

GATE 1

GATE 2

GATE 3

GATE 4

GATE 5

GATE 6

GATE 7

GATE 8

OVERRIDE 1

OVERRIDE 2

OVERRIDE 3

OVERRIDE 4

OVERRIDE 5

OVERRIDE 6

OVERRIDE 7

OVERRIDE 8

MUTE 1

MUTE 2

MUTE 3

MUTE 4

MUTE 5

MUTE 6

MUTE 7

MUTE 8

Logic Ground all 13

UK_AutoMixers_V2.doc Rev 2.0 7

For a good system working

• Keep channel and master volume at about 80%.

• Adjust the GAIN (1 of Fig. 1) to have, in normal working conditions, maximum output power

(out meter = 0dB 16 of FIG.1a e 1b).

• Optimise intelligibility with channel and main equalizer.

• Reduce MASTER volume (15 of Fig. 1a e 1b) in order to obtain the required power.

• Be sure that mass commutator (29 of Fig. 1) is in mass-connected position.

LOUDSPEAKER CONNECTIONS (AMA 3150 and AMA 3250 only)

The device is provided with an output terminal board (35 of Fig.1a) where there are all impedances

available, for connection to constant impedance and constant voltage lines.

Moreover is provided with another multi-way output terminal board (36 of Fig.1a) with the chance

of subdivide total power on independent 4 zone selected by push buttons (19 of Fig.1a).

So could select to the outside the better loudspeakers type for the system to realize.

In Fig.3 there are any loudspeakers connections system example.

Constant voltage lines (50V, 70V, 100V)

In order to achieve the maximum efficiency of the system and to take precautions from amplifier

bad working, it is necessary to check the effective total power handling of the loudspeakers that

has to be equal or lower than the RMS power value of used amplifier. It’s a good rule arranging a

10-20% safety margin on the amplifier power capability. (equal bigger power)

Constant impedance lines (4ohm)

In order to achieve the maximum efficiency of the system and to take precautions from amplifier

bad working, it is necessary to check the effective loading impedance of the lines. The total

speakers impedance should be equal or higher than pre-selected value for connection.

To get that, each loudspeaker should be without transformer and should be connected in series or

in series-parallel groups; In any case loudspeakers should also have the same power handling.

UK_AutoMixers_V2.doc Rev 2.0 8

SPECIFICATIONS (AMA 3150-AMA 3250-AM 3000-AM 3008)

LINE Electronic balanced/Transformer optional

Maximum level: 100mV(GAIN max) 3V(GAIN min)

Input sensitivity: 8mV (-40dBu)/430mV (-5dBu)

MICRO Electronic balanced/Transformer optional

Maximum level: 2.5mV(GAIN max) 200mV(GAIN min)

Input sensitivity: 0,7mV (-61dBu)/45mV (-25dBu) ±1dB

CMRR: >60dB

Gain excursion 36dB

Hi-pass filter: 100Hz 6dB/oct

Phantom power supply: +48V

Impedance TAPE/CD: 47Kohm

Input sensitivity TAPE -12dBu

Input sensitivity CD -7dBu

Output impedance PRE OUT Electronic balanced/Unbalanced

140ohm bal ; 70ohm unbal

Output sensitivity: 0dBu

Output impedance REC Unbalanced 70ohm unbal

Output sensitivity: 0dBu

Output impedance SEND Unbalanced 70ohm unbal

Output sensitivity: 0dBu

Impedance RETURN 47Kohm

Input sensitivity: 0dBu

Bass: ±12dB a 70Hz

Mid: ±12dB a 700Hz

Treble: ±12dB a 10KHz

Equalizer: ±10dB Freq. 315, 500, 700, 1K, 1K4, 2K, 2K4, 3K15,

4K, 6K3Hz

Frequency response (-3dB) input CD: 50Hz÷20KHz

Frequency response (-3dB) input MIC: 100Hz÷16KHz

S/N RATIO 20÷20KHz weighted master at anticlockwise 95 dB

S/N RATIO 20÷20KHz weighted at clockwise 84 dB

EIN Micro (noise equal to the input) 20÷20KHz weighted

Rs=150ohm -126dBV

Power supply: 230V~ 50÷60Hz

UK_AutoMixers_V2.doc Rev 2.0 9

SPECIFICATIONS ( AMA 3150-AMA 3250-AM 3000-AM 3008)

AMA 3150 AMA 3250 AM 3000 AM 3008

Output power RMS 150W

50V, 70V, 100V 250w

50V, 70V, 100V

--------------------------

---------------------------

Output power IHF 225W

50V, 70V, 100V 375W

50V, 70V, 100V

--------------------------

---------------------------

Consumption: 200VA 300VA 20VA 20VA

Dimensions (WxHxD): 436 (Rack482)x132x304 436 (Rack482)x132x254

Weight (Kg): 12 14 2,5 2,5

CONTROLS AND FUNCTIONS (as per Fig.1a, 1b e 1c)

1. GAIN – gain adjustment.

2. NC

3. TREBLE – treble adjustment.

4. MID – mid adjustment.

5. BASS - bass adjustment.

6. OVER – Led for channel overload indication

7. GATE - led indication of open channel.

8. LEVEL – MIC/LINE input volume.

9. BASS – CD/TAPE channel bass adjustment.

10. TREBLE - CD/TAPE channel treble adjustment.

11. TAPE – led indication of input TAPE selection.

12. CD – led indication of input CD selection.

13. CD/TAPE switch selector

14. LEVEL – CD/TAPE channel input volume.

15. MASTER – main volume.

16. VU meter – audio output level indicator.

17. IN/OUT – equalizer selector.

18. EQUALIZER – microphone main equalizer.

19. LOUDSPEAKER – speaker lines selector.

20. POWER – ON/OFF switch.

21. MAINS - 230 V~ supply mains socket, with protection fuse of CA mains.

22. TAPE REC - stereo output for audio recorder.

23. TAPE PLAY - stereo input for audio recorder.

24. CD - compact disc input.

25. PHANTOM / LOW FILTER – Micro-switch to connect 48 VCC phantom supply to inputs and

insert low-cut filter.

26. MICRO 1÷8 – micro/line input

27. ANTILARSEN SEND - output for external sound processing unit.

28. ANTILARSEN RETURN – input from external sound processing unit.

29. GND LIFT / BY-PASS - Micro-switch to connect electrical mass to chassis, and to by-pass

SEND / RETURN connections for antilarsen.

30. PRE OUT – mixed output of “pre” sector of amplifier.

31. VCA REMOTE VOLUME (option) – remote volume control connector

32. REMOTE LOGIC (option)– remote logic circuit control connector

33. PROGRAMS LOGIC(option) – Micro-switch for logic function programs selector.

34. LINK IN – input to extend the number of microphonic input by the AM 3008.

35. POWER OUT – direct speaker lines output.

36. LOUDSPEAKER ZONE OUT – loudspeaker lines output with zone selection

37. LINK OUT – output to connect AM 3008 to amplified mixer or mixer.

UK_AutoMixers_V2.doc Rev 2.0 10

FIG. 1a (Amplified Automatic Mixers AMA 3150-AMA 3250)

Over OverOver Over Over Over

5Gate

2 30V~ 50÷60Hz

S.N.

Gate

242236 23 25 26 25 26

70V

50V

COM

-+3

- -

Ω

100V

+-+

Gate Gate Gate Gate

Bass

Treble

Gain

4Mid

Bass

Treble

Mid

Gain

Mid

Bass

Treble

Gain

Mid

Bass

Treble

Gain

Bass

Treble

Mid

Gain

Treble

Mid

Bass

Gain

Over Over

LINK IN

NO M ON

LA ST ON

A LL O'RIDE

FILIB

GN D LIFT

25 26 25 26 25 26 25 26

NOM OFF

AUTO

2829 27

GateGate

Out

500Hz

315Hz

LOGIC

PROGRAMS

13 12 11

TapeCD

REMOTE LOGIC

25 26 25 26

REMOTE VOLUME

VCA

109 20

OFF

-6

3,15kHz

Bass

Treble

Mid

Gain

Mid

Bass

Treble

Gain

1 kHz

1,4kHz

700Hz

2,4kHz

2 kHz

6,3kHz

4 kHz

PROFESSIONAL AMPLIFIED

AUTOMATIC MIXER

-43 -26-35 -16 -10-14 -8

15 16

-2-4 0 +4

ZONE

Fig.1b (Automatic Mixer AM3000)

230V~ 50÷60Hz

S.N.

Gate Gate

Bass

Over

Treble

Mid

Bass

Over

Treble

Mid

Gain Gain

252422 23 2625 2526 26 2625 25 262526 26

AUTO

NOM OFF

25 26 25

AUTOMATIC MIXER

PROFESSIONAL

GateGate Gate Gate

30 2829 27 34

GND LIFT

LINK IN

GateGate

17 14

500Hz

315Hz

Out

Bass

Treble

OverOver

Bass

Mid

Treble

Over

Bass

Mid

Treble

Gain Gain

Over

Bass

Mid

Treble

Mid

Gain Gain

Bass

Treble

Mid

Over

Gain

Bass

Treble

Mid

Over

Gain

1 kHz

1,4kHz

2,4kHz

2 kHz

700Hz

4 kHz

3,15kHz

6,3kHz

18 15

REMOTE VOLUME

3133 32

FILIB

PROGRAMS

LOGIC

A LL O'RIDE

LA ST ON

NO M ON

REMOTE LOGIC

VCA

12 911

TapeCD

OFF

-16-43 -35 -26 -14 -10 -6-8 -4 +40-2

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