Introduction of Ahuja PA Mixer Amplifier DPA-770

The PA Mixer Amplifier DPA-770 is a powerful and versatile audio solution designed for a variety of professional and commercial applications. This 7-channel mixer amplifier offers a total power output of 700 Watts, making it suitable for medium to large-sized spaces. The estimated price of the Ahuja Mixer Amplifier DPA-770 is around $500 to $600, and it was launched in 2020.

SPECIFICATIONS

Power Output

100W RMS (max)
75W RMS at 10% THD (Rated)
70W RMS at 5% THD

Input Channels

4 x Mic 0.6mV (Lo-Z) / 4.7kg
1 x Aux 100mV / 330kg

Frequency Response

50Hz-15,000Hz ±3dB

S/N Ratio

55dB

Tone Control

Bass: -10dB +7dB at 100 Hz
Treble: -10dB +7dB at 10 kHz

Speaker Output

Line Output: 4, 8, 16Ω & 100V
1V/3.5 kg

MP3 PLAYBACK

MP3 (FAT 32 Format)
Port: USB-A (Full speed)

GENERAL

Power Supply

AC: 220-240V 50Hz*
DC: 12-14 V Car Battery

Power Consumption

AC: 140VA at rated output
DC: 5 A / 12V

Protections

AC: Fuse 2 Amp. (T 2AL)
DC: Fuse 10 Amp. (T 10A L)

Indicators

Pilot LED, USB Display
5 LED Array for output level

Dimensions

W385 x H125 x D300 mm

Weight

8.80 kg approx.

Ahuja PA Mixer Amplifier DPA-770 FEATURES

PA Mixer Amplifier with built-in MP3 Player and Remote Control.
Provision for automatic changeover from AC to Battery Operation ensuring continuity of program.
100V line for long distance speaker connections.
Separate active BASS and TREBLE controls for shaping tonal quality of music & speech as desired.
LINE OUT for connecting additional booster amplifier.
Four low impedance Microphone inputs and one Aux. Input. The Aux input is for connecting Mixer, CD Player, etc.

Front & Rear Panel Controls & Features

MIC-1 Input Jack Socket: For connecting a low impedance microphone.
MIC-2 Input Jack Socket: For connecting a low impedance microphone.
MIC-3 Input Jack Socket: For connecting a low impedance microphone.
MIC-4 Input Jack Socket: For connecting a low impedance microphone.
MIC-4/USB Selector Switch
TREBLE Control: For controlling the high frequency signals.
MP3 Playback Facility: For details see prints A to F.
POWER switch: Push the top part of the knob to switch the amplifier ON. Push the bottom part of the knob to switch the amplifier OFF.
POWER LED: This LED glows to indicate that the set is ON.
LED Array: For output level indication.
MASTER Control: For overall adjustment of volume level.
BASS Control: For controlling the low frequency signals.
MIC-4/USB Volume Control
MIC-3/AUX Volume Control
MIC-2 Volume Control
MIC-1 Volume Control
AC Mains Fuse Rating 2Amp. 250V (T 2AL)
AC Mains Cable with plug
BATTERY Terminal Strip: For connecting a 12V car battery.
SPEAKER Terminal Strip: For connecting Speakers or Driver Units.
EARTH Terminal
LINE Output Jack Socket: For connecting to a higher wattage amplifier.
AUX Input Jack Socket: For connecting an auxiliary source like a CD player, Tuner, Echo or Audio Mixer etc.
ABS Legs: For supporting the unit on its back while handling.

MP3 Playback Facility

A. Prev: Press PREV to select the previous track.
B. Next: Press NEXT to select forward music tracks.
C. Play/Pause: Press Play/Pause once to Pause when music is already playing. Press Play/Pause again to resume playing.
D. Display: Displays the track played.
E. USB Connector: Insert the USB drive here.
F. IR Sensor: Picks up signal from the Remote control. Point the Remote control toward this sensor for best results.

Remote Control

Power: Press once to switch off MP3 player, press again to switch ON.
Number key 0 to 9: To choose the track number to be played.
Prev: To select the previous track.
MODE: Not in use.
Next: Press to select the next track.
Repeat: Press once to repeat the song being played. Press again to repeat all the songs.
STOP: Press to stop the track being played.
Vol -: Press to decrease the volume of MP3 Player.
Vol +: Press to increase the volume of MP Player.
MUTE: Press once to mute the sound, press again to resume the sound.
Play/Pause: Press Play/Pause once to Pause when music is already playing. Press Play/Pause again to resume playing.
Battery Replacement: Pull out the battery tray and replace the battery with positive electrode facing upwards as shown in fig. below. Push the battery compartment back to the close position. Use CR2025 or equivalent lithium coin cell.

CAUTION: Use only FAT-32 format in USB drive for MP3 tracks.

Speaker Connections

Low Impedance

Speaker impedance taps of 4, 8, and 16 ohms have been provided for direct connection of speakers to the amplifier when the distance between the amplifier and speakers is less than 50 meters. Use 23/36 or thicker cable for connections. Be sure that the total impedance of speakers is equal to or above the impedance specified on the terminal strip.

100V Line

When it is desired to connect speakers or driver units at a distance over 50 meters, it is recommended that the 100V line output be used together with line matching transformer for each speaker. This prevents excessive power loss in the speaker cables.

IMPORTANT: Speaker impedance mismatch may cause insufficient output or overheating of the components which may result in the failure of components.

Phasing of loudspeakers/units

When two or more speakers/units are installed in the same area and are facing in the same direction, it is essential that their cones/diaphragms move in unison. Otherwise, the sound output of one speaker will cancel the sound output of the other. To avoid any mistake, the terminals of box speakers are marked '+' & '-'. Always connect the COM of the amplifier to '-' of speakers & 4Ω / 8Ω / 16Ω terminal of the amplifier to the '+' of the speakers. The terminals of speakers/units with LMT are marked COM and power tapping. COM of these speakers/units should be connected to the COM of the terminal strip of the amplifier and the power tap to 100V line.

Description

The Ahuja Mixer Amplifier DPA-770 is a high-quality audio solution that is ideal for commercial and professional applications. It features 7 channels, each with a power output of 100 Watts, for a total power output of 700 Watts. This makes it suitable for medium to large-sized spaces such as auditoriums, conference rooms, and houses of worship. The mixer amplifier has a frequency response of 20 Hz to 20 kHz, ensuring clear and accurate sound reproduction. It also features a signal-to-noise ratio of 70 dB and total harmonic distortion of less than 0.5%, ensuring high-quality audio performance. The unit has a rugged and durable design, with dimensions of 430 mm (W) x 360 mm (D) x 115 mm (H) and a weight of 12 kg. It also features convenient front-panel controls for easy operation.

Operating Procedure of Ahuja PA Mixer Amplifier DPA-770

Set all volume controls to '0' position and keep the power switch at OFF position. Connect the speakers and required inputs. Plug in the AC power supply cord to the nearest AC mains socket and put the power switch to POWER position. The pilot LED should glow.
Select the desired MIC input to use and increase the individual control to desired level. Keep master control at 6 or 7 position. Select MIC/USB Switch to desired input e.g USB or MIC-4.
For USB
- Select the MIC/USB Switch to USB
- Insert pen drive to USB port, it starts playing automatically from the Ist track or from the last track played if the same pen drive is used earlier.
- Use Remote Control to select the desired track. Use Volume button on the remote control to adjust desired USB playback level.
- Setting of last volume level remains in memory even when power failure occurs.
- Three touch switches provided on amplifier to select Play/Pause, Next or Previous tracks.
Bass and Treble setting can be done for desired tonal quality.
Use remote control to switch OFF the USB MP3 Player while not in use. If power to the amplifier is switched OFF and ON again, the USB function will automatically switch ON again.

Safety Instructions

Read the Instructions: Please read all the instructions in this section carefully before installation or use of the product. All the safety instructions must be followed & the Manual for future reference.
This symbol, wherever it appears, alerts you to the presence of uninsulated hazardous voltage that may be sufficient to constitute a risk of electric shock. External wiring to any terminal marked with this symbol must be done by a trained and instructed person only.

WARNING

To reduce the risk of electric shock, do not remove the top cover. No user serviceable parts inside. Refer all servicing to qualified personnel only.
Before replacing any fuse, make sure the set is switched off and disconnected from the AC mains or any other power source. Replace a fuse only with another of exactly same specification.

CAUTIONS

Water & Moisture: To reduce the risk of fire or electrical shock, do not expose this set to rain or moisture. Do not use this set near water or in a wet location. Do not keep any object filled with liquid, such as a vase, on top of this set. Do not insert or remove the AC mains plug with wet hands.
Power Source: The voltage & frequency of the AC mains supply, and the voltage of the external battery, (if applicable) to which this set can be connected, is marked on the rear panel of the set. Do not connect this set to any power source other than those specified on the rear panel.
Power Cord Protection: Do not cut, kink, damage or modify the AC power cord supplied with this set. Keep the AC power cord away from heaters and harmful chemicals. Do not keep any heavy object on the power cord.
Ventilation: This set should be situated so that its location or position does not interfere with its proper ventilation. Do not cover the ventilation holes / slots. Do not insert or drop anything into the ventilation holes / slots.
Stability: This set must be kept in a stable and flat horizontal position, and never in a tilted position. Do not place this set on an unstable stand, tripod, bracket or mount. Do not use attachments which are not supplied or explicitly recommended by the manufacturer.
Cover Strip: The cover strip of the 100V / 70V audio output terminal strip must be replaced after making connections.
Earthing: This set must be earthed properly before use. A wire from the Earth terminal on the rear panel must be connected to electrical earth.
Cleaning: Disconnect this equipment from the AC mains and external battery before cleaning. Clean with a damp cloth, but do not allow any liquid to enter the set. Do not clean with liquids or aerosols.
Exposure to Heat: Do not touch the heatsinks while the set is working.

Setup Guide

To set up the Ahuja Mixer Amplifier DPA-770, follow these steps:

Connect the audio sources to the mixer amplifier using the appropriate cables.
Adjust the input sensitivity and volume levels for each channel as needed.
Connect the mixer amplifier to a pair of speakers using speaker cables.
Power on the mixer amplifier and adjust the master volume level as needed.

Troubleshooting

If you encounter any issues with the Ahuja Mixer Amplifier DPA-770, try the following troubleshooting steps:

Check that all connections are secure and that the audio sources are properly powered on.
Adjust the input sensitivity and volume levels for each channel to ensure that they are not set too high or too low.
Check the speaker cables for any signs of damage or wear, and replace them if necessary.
Make sure that the mixer amplifier is properly grounded to prevent any electrical interference.

Pros & Cons about Ahuja PA Mixer Amplifier DPA-770

Pros

Powerful 7-channel mixer amplifier with a total power output of 700 Watts
Clear and accurate sound reproduction with a

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