SEIKAKU TA-512MEC Mixer Power Amplifier Instruction Manual

SEIKAKU TA-512MEC Mixer Power Amplifier

Product Information

Specifications

• Type: Mixer power amplifier
• Model: TA-512MEC
• Power output: Rated – 30W, Maximum – 45W
• Output regulation: Less than 2 dB no load to full load
• Outputs:
  • Speaker outputs (balanced): 30W 4Ω (11V), 50V (83Ω), 70V (170Ω), 100V (330Ω)
  • Speaker outputs (balanced): 60W 4Ω (15.5V), 50V (42Ω), 70V (83Ω), 100V (170Ω)
  • Speaker outputs (balanced): 120W 4Ω (22V), 50V (21Ω), 70V (42Ω), 100V (830Ω)
• Inputs:
  • TAPE OUT: 4.7K ohms, 650mV
  • AUX OUT: 600 ohms, 1V
  • INPUT 1 (MIC 1): 600 ohms, 0.5mV
  • INPUT 2 (MIC 2): 600 ohms, 0.5mV
  • INPUT 3 (MIC 3): 600 ohms, 0.5mV
  • INPUT 4 (MIC 4): 600 ohms, 0.5mV
  • INPUT 5 (AUX 2): 10 ohms, 100mV
  • AUX 3: 10k ohms, 100mV
• Frequency Response: 50-15,000Hz ±3 dB
• Total harmonic distortion: Less than 4% at 1kHz, rated power
• Signal-to-noise ratio (Tone control centered):
  • All volume controls c.c.w.: 80 dB below rated power
  • Microphone: 60 dB below rated power
  • AUX 2: 70 dB below-rated power
• Tone controls:
  • BASS: ±10 dB at 100Hz
  • TREBLE: ±10 dB at 10kHz
• Controls:
  • INPUT 1 Volume control
  • Tone controls (BASS, TREBLE)
  • INPUT 2 Volume control
  • INPUT 3 Volume control
  • MASTER volume control
  • INPUT 4 Volume control
  • Voltage selector
  • INPUT 5 Volume control
  • AUX 3 Volume control

Product Usage Instructions

Caution for Using Power Line

You shall hold the plug firmly to avoid the pull-out of the power line and risk occurring when you pull the power line out from the AC outlet. The plug of the power line for this unit should be pulled out from the power outlet to cut down the power supply when this unit isn’t used for a long period. Don’t force any matter on the power line of this system to avoid damaging the power line and don’t insert the knotted power line into the unit.

Placement

This broadcast system, main unit, 500 series should be placed on a solid surface with a minimum distance of 1m from the back or side plate to the wall. Do not place it in the following environments or cases:

• Moist place
• Under direct radiation of sunlight or other strong heat radiation
• No air ventilation
• To prevent the risk of fire or electrical shock, never expose this equipment to rain or dampness.

Handling This Unit

Check if the power supply is being shut down, the power line is pulled out from the outlet, and other lines connecting this unit are also disconnected.

Disassembly

Do not disassemble and repair the unit by yourself, otherwise it may induce electric shock or fires. If you can’t remedy any trouble according to the methods described in the last
section of this manual, you must call a qualified technician or consult with our company. A forced use may cause electric shock or fires.

Cleaning

When the unit needs cleaning, you can blow off dust from the unit with a blower or clean it with a rag, etc. Do not use solvents such as benzol, thinner, alcohol, or other fluids with very storing volatility and flammability for cleaning the unit body.

FAQ

• Q: Can I use this amplifier in a moist environment?
• A: No, this amplifier should not be used in a moist place to prevent the risk of fire or electrical shock.
• Q : Can I disassemble and repair the unit by myself?
• A : No, it is not recommended to disassemble and repair the unit by yourself as it may induce electric shock or fires. Please call a qualified technician or consult with our company for assistance.
• Q: How should I clean the unit?
• A: When the unit needs cleaning, you can blow off dust from the unit with a blower or clean it with a rag, etc. Do not use solvents such as benzol, thinner, alcohol, or other fluids with very storing volatility and flammability for cleaning the unit body.

Front Panel Controls and Features

off modes.
2| POWER INDICATOR| Comes on when the power is turned on.
3| OUTPUT LEVEL METER| Indicates output level.
4| INPUT 1-5 VOLUME CONTROL| Adjusts gain of INPUT 1-5 respectively.
5| BASS CONTROL| Adjusts bass response. Turn clockwise (CW) to boost and counterclockwise (CCW) to attenuate the bass response. The tone is flat at center.
6| TREBLE CONTROL| ****

Adjusts treble response. Turn clockwise (CW) to boost and counterclockwise (CCW) to attenuate the treble response. The tone is flat at the center.

7| MASTER VOLUME CONTROL| Adjusts the overall gain of the unit.
8| ECHO VOL

Rear Panel Controls and Features

impedance (30-600 ohms).
2| INPUT (MIC 2)| Connects to a microphone of balanced or unbalanced low impedance (30-600 ohms).
3| INPUT 3

(MIC 3/MAG. PHONO)

| Connects to the unbalanced microphone or the record player with an MM-type cartridge
4| INPUT 3 SELECT SWITCH| ****

Select MIC 3 or MAG. PHONO input.

5| INPUT 4 (MIC 4/AUX 1)| ****

Connects to the unbalanced microphone or Aux input.

6| INPUT 4 SELECT SWITCH| Select MIC 4 or AUX 1 input.
7| INPUT 5 (AUX 2)| ****

Connects to Aux input.

8| AUX 3 INPUT| ****

Connects to AUX input.

9| AUX 3 VOLUME CONTROL| ****

Adjusts gain of AUX 3.

10| TAPE OUTPUT| ****

Provides connections for a tape recorder.

The input impedance of the equipment should be more than 4.7k ohms.

11| AUX OUTPUT| ****

Provides connections for a booster amplifier.

The input impedance of the equipment should be more than 600 ohms.

12| AC FUSE| ****

Prevents excessive current flow.

13| DC POWER SWITCH| ****

Control DC supply.

14| EARTH TERMINAL| ****

Normally connect to record player’s ground.

15| OUTPUT TERMINALS| ****

Connect to speakers.

16| DC TERMINALS| ****

Connect to DC power supply. 12V DC: 30W

24V DC: 60W, 120W

17| AC POWER SUPPLY CORD| ****

Connects to AC power source.

Installation

Unpacking

State the date, nature of the damage, and whether any damage was noticed on the shipping container, prior to unpacking. Please give the waybill number of the shipping order.
Do not block cover ventilation holes. The amplifier should not be placed in areas

1. with poor ventilation.
2. exposed to direct sunlight.
3. with high ambient temperature or adjacent to heat-generating equipment.
4. with high humidity or dust levels.
5. susceptible to vibration.

CAUTION
Do not remove the cover since this may cause an electric shock. Do not remove the cover since this may cause an electric shock.

DC Power Operation

The unit will also operate from an external battery or other direct current source with negative (-) as ground. Power connections are made at the DC terminal strip on the rear panel.
If an AC power supply fails, transfer to DC power is instantaneous, automatic, and silent. The battery power supply is operated by the primary power switch.

CAUTION
The unit should be used only with negative-grounded vehicleThe unit should be used only with negative-grounded vehicles or frames when DC operation is required. or frame when DC operation is required. Do not use the unit with positive-grounded equipment does not use the unit with positive-grounded equipment of DC operation. of DC operation.

Input Connection

Microphones

Four microphone inputs are provided. The microphone inputs are a double pole phone jack and of an unbalanced type. They may be used with a balanced or unbalanced low impedance (30-600 ohms) microphone The microphone with an unbalanced connection cable of 10~20 meters may be used depending on the microphone and its characteristics. For balanced low impedance microphone: Connected to the double conductor shielded cable of balanced LO impedance microphone.

For unbalanced low impedance microphone:
May also be connected to the single conductor shielded cable of an unbalanced Lo impedance microphone.

When connecting the microphone to INPUT 3 and INPUT 4, place the rear-mounted INPUT 3 select and INPUT 4 select switches in the MIC 3 and MIC 4 positions, respectively.

Record player

Magnetic phonograph cartridge may be connected to (INPUT 3) MAG PHONO input. Ceramic or crystal cartridge pick-up may be connected to AUX 1 input (00mV, 220K ). Use the single-conductor or double-conductor shielded cable with a terminating phone plug. It is recommended that 3 separate ground wires be connected between the phono player base and the GND ( ) terminal of the terminal strip on the panel.

When connecting a record player with a type cartridge to INPUT 3, set INPUT 3 and select switch to MAG, PHONO.

When connecting a record player with a ceramic or crystal type cartridge to INPUT 4, set INPUT 4 and select switch to AUX 1.

Radio tuner, cassette tape player, and other BGM sources

A radio tuner, tape player, chime, mixer preamplifier, compact disc player, or other high-level signal source may be connected to the AUX 1, AUX 2, or AUX 3 input. Use single or double conductor shielded cable with a terminating phone plug.

When using INPUT 4 as AUX 1, set INPUT 4 and select switch to AUX 1 position.

Output Connection

AUX OUTPUT

To operate a booster amp connect between the AUX OUT jack of this unit and the input of the booster amp by ens of a single conductor shielded cable with a phone plug. The volume of this output is adjustable with the individual The volume of this output is adjustable with the individual volume control, but not with the master or tone controls. Use the input volume control of the booster amplifier when the overall volume adjustment is necessary

TAPE OUTPUT

To operate a tape recorder, connect the single conductor-shielded cable with a phone plug from the TAPE OUT jack to the input of the tape recorder. Since this output level cannot be controlled with the tone or the master control of the amplifier, use the controls of the tape  recorder to adjust the signal level

SPEAKER OUTPUTS

The amplifier may be used in conjunction with a speaker rated at 4 ohms or with 50 Volts. 70 Volt or 100 Volt constant-voltage speaker systems. 4 ohms (4~16 ohms) speaker output (balanced)
The 4 ohms (4~16 ohms) speaker output terminal is provided for connection with low impedance speakers (more than 4 ohms in total) when a constant-voltage speaker system is unnecessary or in case the distance between the amplifier and the speaker is short enough (less than 50m). lt is requested that the total speaker load impedance be correctly matched to the output impedance (4 ohms) of the amplifier for the most efficient transfer of power.

CAUTION
When connecting speakers to any one of the outputs of 4 ohms, 50V, 70V, or 100V

50V, 70V, and 100V speaker output (balanced) When it is desired to operate the speakers from the distance, over 50 Meters of the amplifier, it is recommended that line-matching transformers be installed on the speaker units to prevent excessive line losses. This method of load matching known as the constant voltage distribution system eliminates the calculation of lade impedance and series-parallel speaker arrangements. In this method, all speakers are connected in parallel. These constant voltage outputs are most convenient for the distribution of power when a number of speakers are installed. Each speaker must have 50 50-volt, 70-volt, or 100-volt line transformer with a tap that gives the power desired for that speaker. The total number of power settings for all speakers should be equal to the amplifier power rating or less. See the following diagrams

Typical connection

Operation

Volume control setting

For the average input signals, the master volume control should be set to around 7. In relation to the levels of inputs, it is recommended that the gains or losses should be equally divided between individual controls and the master control.

Tone control setting

The separate tone controls provide boost and attenuation of bass and treble response. The flat position is obtained when the knobs are set to o. Turn the bass control knob (BASS) and treble tone control knob (TREBLE), respectively, clockwise to raise the tone level by approximately +10 dB; turn counterclockwise to lower the tone level by approximately -10 dB. Where a microphone paging is provided to a reverberant room, clear, crisp sound reproduction is possible by attenuating bass.

Output level meter

The LED meter indicates the output level. When voice or music is amplified in practice, set the volume control at the position where the maximum output level is below zero. While the red LED indicator remains lit, the output is distorted. In this case, lower the sound volume by means of a volume con

Specifications

180W
Output regulation| Less than 2 dB no load to full load
Outputs| Speaker outputs (balanced)

30W 4  (11V), 50V (83) 70V (170  ), 100V (330 )

60W 4  (15.5V) 50V (42 ) 70V (83  ), 100V (170  )

120W 4 (22V) 50V (21  ) 70V (42  ), 100V (830  ) TAPE OUT: 4.7K ohms, 650mV

AUX OUT: 600 ohms, 1V

Inputs| INPUT 1: (MIC 1) 600 ohms, 0.5mV

INPUT 2: (MIC 2) 600 ohms, 0.5mV

INPUT 3: (MIC 3) 600 ohms, 0.5mV (MAG PHONO) 50k ohms, 2mV

INPUT 4: (MIC 4) 600 ohms, 0.5mV (AUX 1) 220k ohms, 100mV

INPUT 5: (AUX 2) 10 ohms, 100mV

AUX 3: 10k ohms, 100mV

Frequency Response| 50-15,000Hz  3 dB
Total harmonic distortion| Less than 4%

at 1kHz, rated power

| Less than 2% 1kHz, rated power
Signal-to-noise ratio (Tone control center)| All volume controls c.c.w. ; 80 dB below rated power Microphone : 60 dB below rated power

AUX 2: 70 dB below rated power

Tone controls| BASS      : 10 dB at 100Hz TREBLE : 10dB at 10kHz
Controls| INPUT 1 Volume control      Tone controls (BASS, TREBLE) INPUT 2 Volume control

INPUT 3 Volume control                                                 MASTER volume control INPUT 4 Volume control Voltage selector

INPUT 5 Volume control

AUX 3 Volume control

Indicator| Power indicator (LED)               LED output level meter
AC power supply| 110~127V 60Hz / 220~240V 50Hz
Dc power supply| 12V| 24V| 24V
AC power consumption| 90 Watts

at rated output

| 160 Watts

at rated output

| 320 Watts

at rated output

DC power consumption| 4.8A

at rated output

| 4.2A

at rated output

| 8A

at rated output

Dimensions| 88.5mm(H) x 420mm(W) x 280mm(D)
Weight| 6.9kg| 7.8kg| 10.0kg
Color| Black

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