dynavox ESA-18 MK BT Stereo Amplifier Instruction Manual
- June 9, 2024
- dynavox
Table of Contents
dynavox ESA-18 MK BT Stereo Amplifier
We thank you for the confidence you prove in purchasing our product. It complies with all established international safety standards. Nonetheless, the following in structions should be fully read and observed in order to prevent any hazard: In order to ensure correct operation, please read these instructions thoroughly before setting up and connecting this device. We accept no liability for damage to property or injury to persons caused by improper handling or failure to observe the safety instructions. In such cases any guarantee claim is extinguished. We strong ly recommend that if possible you retain the original packaging in case of any subsequent need for transportation.
The ESA-18 MK BT is a compact HiFi amplifier for two stereo RCA input sources,
BT and a microphone. If two analog sources are connected to the RCA inputs,
their signal will be mixed. There is no option to switch between the two
sources. If a dynamic microphone is connected, its signal will be mixed with
the signal from sources depending on the setting of the microphone volume (2)
(karaoke function). An ad jus table echo effect can be added to the microphone
signal. Additional equipment features are tone control (bass, treble), volume
and a switch for adjusting the signals of the input sources. With the
preamplifying output the signal that can be heard via the loudspeakers can be
transmitted to a recording device (tape recorder etc.) or a subwoofer.
Thanks to its small size the amplifier is especially suitable as a portable
karaoke system and also for playing audio from a computer or as a space-saving
and modest amplifier for a small stereo system.
SECURITY PRECAUTIONS
All equipment that is connected to the domestic mains voltage can be dangerous to the user if not handled properly. Do not open the appliance!Risk of electric shock! Regularly check the technical safety of the device. If the mains cable or the housing is damaged or the device has been stored for a long period in unsuit-able conditions or the device has been exposed to severe stresses during transportation or if it is no longer working, then it is no longer possible to ope-rate it without risk. The device must then be taken out of use and secured against unintended switching on again (take the mains plug out of the socket!). Leave the maintenance to qualified staff. After a fault only allow the device’s fuse to be replaced by specialist staff with one of the same type. The product is only authorised for connection to 230 Volt/50 Hz alternating current, with insulated earth sockets and for use in closed rooms. The gua-rantee claim is extinguished if any changes are made to the device or its serial number.
Always pull the plug and never the power cable if you want to disconnect the appliance from the mains power. Make sure when setting up the appli-ance that the power cable is not squashed, severely bent or damaged by sharp edges. Do not touch the power lead with wet or damp hands. Switch the appliance off every time before you connect or remove other components or loudspeakers, discon-nect or connect it to the mains power, leave it unused for a longer period or want to clean its ou tside. Make sure that a gap of 5 cm remains around the appliance and that the surrounding air can circulate. Vents must not be covered up. Contact of electrically operated equipment with liquids, moisture, rain or water vapour is dangerous for such equipment and the user and must be avoi-ded without fail. Take care that no liquids or objects get inside the appliance (ventilation slots etc.). It must be disconnected from the mains power immediately and examined by a professional if this happens. Never expose the appliance to high tem-peratures (direct sunshine) or strong vibration. Pull out the plug before cleaning the outside of the product. Do not use abrasives, solvents, thinners, flammable chemicals, polishes and other cleaning products that leave marks.
USER INFORMATION
Electronic waste
This appliance is subject to the conditions set out in the European Directive
2012/19/EU, whose imple-mentation is regulated in Germany by the Electrical
and Electronic Equipment Act (ElektroG). This is identified by the symbol of a
crossed out waste bin on the appliance. All old electrical and electronic
equipment that is no longer used must be disposed of separately from domestic
waste using places provided by the authorities. For further information about
disposing your old appliance, please consult your local authority, waste
disposal agency or the shop where you bought the product.
CE-Sign
This appliance complies with the current EU directi-ves about attaining the CE
mark and thus meets the requirements for electrical and electronic equipment
(EMC regulations, regulations and regulations for low voltage equipment.)
Dynavox works continually to improve and develop its products. Therefore, the
appearance and techni-cal design of the appliance are subject to changes, as
long as they are in the interest of progress. The content of these
instructions is for information purposes only. It can be changed at any time
without prior notice and does not constitute any obligation on the part of the
trademark’s owner. The latter assu-mes no responsibility or liability for
errors or inaccu-racies, which may be included in these operating
instructions. Dynavox is a registered trademark of Sintron Distribution GmbH,
76473 Iffezheim. This document is a product of Sintron Distribution GmbH,
76473 Iffezheim and may not be copied or distributed partly or in full without
express, written consent.
Minimum quality : highly sensitive audio amplifiers are apt to generate demodulation products in the vicinity of rf sources.
FRONT VIEW
-
POWER
Switches the device on and off. When switched off, the device is disconnected from the mains. The LED located next to the switch lights up when the devi-ce is switched on. -
MIC INPUT
You can connect a dynamic microphone to this 6.3 mm jack socket. You must not attach a high level source here under any circumstances! -
MIC VOL
With this volume control you set how loud the microphone signal is mixed to the input signals at the “AUDIO INPUT” (9) connectors. -
DIGITAL ECHO
With this dial you set the intensity of the echo affecting only the microphone signal. -
BASS
For setting the bass proportions (low frequencies) of the sound. -
TREBLE
For setting the treble proportions (high frequencies) of the sound. -
LOUDNESS
This button activates and deactivates a sound cor- rection that adapts the speaker audio signal to the human auditory sensation in the lower volume range. -
BT/LINE
Source selector BT/LINE. -
BT LED
Status LED for BT. -
VOLUME
The volume of the loudspeakers may be increased or decreased with this.
REAR VIEW
-
AUDIO INPUT
Here you can connect one or two source devices with stereo audio high level output and their signals are mixed to the amplifier. -
PRE OUT
If desired, attach a recording device or subwoofer here, for example. The stereo signal of this recor-ding output is identical to the mixed signal from the input sources. -
SIGNAL IN
With this switch you can adjust the sensitivity of the two stereo inputs of the amplifier (9) to stron-ger input signals with the setting “LOW”. Normal setting is “HIGH”. The signal of the microphone input (2) remains unaffected by this. -
TO SPEAKER
Output sockets with screw clamps for connecting one pair of loudspeakers. Loudspeaker cables with 4 mm banana connectors may be used. -
AC 230V 50Hz
Connect this mains cable to a suitable electricity supply. -
BT Antenna
Antenna for BT signals. -
A-S ON/OFF
Switch for Autostandby ON/OFF (see also page 39).
TYPICAL KARAOKE SYSTEM
For a typical karaoke system connect the high level output of an audio source for the playback music (CD player, computer, portable player etc.) using an RCA cable with one of the inputs being “AUDIO INPUT” or use the BT connection. Connect a dyna-mic microphone to the microphone input socket “MIC IN” on the front of the device. If the karaoke mix is to be recorded, connect the recording output “PRE OUT” to the high level input of a recording device (tape, CD recorder etc.). The loudspeakers must be connected, each with a loudspeaker cable, to the two loudspeaker outputs “R” (right) and “L” (left) in the connection area “TO SPEAKER”.
CONNECTION AND PLACING INTO OPERATION
Make the cable connections in the order specified below. Never make changes to the cable connecti-ons while the devices are switched on! Mechanically identical RCA plugs are available for input and out-put connections. Make sure that you do not get these connections confused during installation!Make sure that you do not mix up the analogue inputs for right and left. The RCA plugs for these are frequently colour coded as follows: red for the right channel, black or white for the left channel. Make sure that all plugs fit tightly. Inadequate connecti-ons can cause noise interference, failures and mal- functions.
Connection of the source equipment
One or two stereo sources with RCA high level out-puts may be connected to the
two stereo RCA inputs “AUDIO INPUT” (9). Use standard RCA cables. The output
connectors of the source devices are often labelled “LINE OUT”. The input
connectors of this amplifier (11) or a BT signal are electrically iden-tical
high level inputs with RCA sockets whose signals are mixed together
internally. There is no option to switch between the two RCA sources.
Connection of a recording device
If desired you can connect to the RCA sockets “PRE OUT” (12) (on the back of
the device) a stereo rec-ording device (e.g. CD recorder, tape recorder etc.)
or another device that is to receive the stereo out-put level (line level) or
the BT signal of the sources. The signal emitted via this output consists of
the mix signals on the two RCA inputs and, if a suitable microphone is
connected, the microphone signal. The output level at the preamplifying output
depends on the volume setting and tone control (BASS, TREBLE, LOUDNESS).
Connect this signal output with a standard RCA cable to the signal input
(“LINE IN”, “TAPE IN” or “REC IN”) of the rec-ording device or a subwoofer.
Connection of a microphone
A dynamic microphone may, if desired, be connec-ted to this 6.3 mm jack
socket. Condenser micro-phones or other microphones that need a voltage supply
when connected (e.g. phantom-powered micro -phones) cannot be used with this
amplifier. Never connect a high level source (CD player etc.) to this input.
Connection of the loudspeakers
It is recommended that ready-made loudspeaker cables are used instead of
clamping on the cable core directly. Banana connectors or cable lugs pro-vide
greater protection from short circuits and damage to the loudspeakers or the
amplifier. Use speaker cables of sufficient diameter for connecting your
loudspeakers with the ESA-18 MK BT. Make sure that bare loudspeaker cables can
never touch each other or the back wall of the housing! Only use loudspeakers
with a nominal impedance of at
least 4Ω.
One pair of loudspeakers may be connected to the amplifier. You will find two loudspeaker clamps (positive + and negative -) for each loudspeaker (R: right and L: left) on the device (14), these clamps have to be connected to one end of a loud-speaker cable. There are identical or similar connec-tors on the loudspeakers and here too the polarity is stated. This is where the other end of the loud-speaker cable assigned to the loudspeaker is con-nected. In each case, the same polarity must be connected by each loudspeaker wire: the clamp marked with “+” on the amplifier must be connec-ted with the connector marked with “+” on the loudspeaker. If you use ready-made loudspeaker cables with 4 mm banana connectors, you need to connect only the two plugs of each loudspeaker cable with the two associated clamps and the screw cover of the clamp should be turned in a clockwise direction. If loudspeaker cables with cable lugs are used, then the screw head on every clamp must be loosened in an anticlockwise direction, the cable lug pushed under it and the screw cover tightened in a clockwise direction. If the loudspeaker cables are to be attached without connectors, remove a piece of the insulation about 1 cm long from each end of the loudspeaker wire. Twist the bare wire in order to prevent short circuits. Turn the knob of the loudspeaker clamp in anticlockwise direction to loo-sen it and feed the bare wire end into the clamp hole now exposed. Now turn the knob in a clockwi-se direction to secure the wire in the loudspeaker clamp. Make sure that the screws are tight.
Connection of the mains cable
Connect the power plug to a mains socket which is supplied with an appropriate
voltage (230 V/50 Hz). Do not switch the device on until after you have
adjusted the volume control (10) in anticlockwise direction to the minimum
volume.
OPERATING THE APPLIANCE
| Operation | Button(s) | Description |
|---|---|---|
| Switch on and off | POWER | The amplifier is switched on and off using |
this button at the front
| (1)| panel. When switched off the device is internally separated from
the
| | AC power. The LED next to the mains switch lights up when the
| | device is switched on. As a precaution, after switching on, the volu-
| | me setting (10) should be reduced.
Change the volume| VOLUME| Turn the knob “VOLUME” clockwise to turn up
the volume and
| (10)| counter-clockwise to turn it down. The volume setting does
influen-
| | ce the signal at the output “PRE OUT” (12).
Adjust audio sources| SIGNAL IN| This switch should be left in the
“HIGH” position for common
with a higher signal| (11)| high level sources (CD players, tuners
etc.). It must only be set to
level to the amplifier| | “LOW” if the amplifier is overdriven by the input
signal (very loud,
| | distorted, clipping or effective area of control is in the lower range).
| | The volume (10) should be reduced for safety reasons before switching.
| | HIGH = normal, sensitivity suitable for high level sources
| | LOW = lower sensitivity for more powerful input signals
Operation| Button(s)| Description
---|---|---
Change the treble| TREBLE| With the “TREBLE” control dial on the front
of the device you affect
proportions of| (6)| the proportion of higher frequencies in the sound.
Turning it in
the sound| | clockwise direction increases the treble intensity and moving it
in
| | anticlockwise direction reduces it. In the middle setting the treble
| | proportions of the input signals remain unchanged.
Change the bass| BASS| With the “BASS” control dial on the front of the
device you affect
proportions of| (5)| the proportion of lower frequencies in the sound.
Turning it in clock-
the sound| | wise direction increases the bass intensity and moving it in
anti-
| | clockwise direction reduces it. In the middle setting the bass pro-
| | portions of the input signals remain unchanged.
Switch the sound| LOUDNESS| This function is a feature of audio
amplifiers that permits the user
correction for low| (7)| to strengthen low and high frequencies compared
with middle fre-
volume on and off| | quencies at the touch of a button. It thereby corrects
the impression
| | of volume at low volume. In an audio system, when the volume is
| | small, low and high frequency ranges are insufficient because of the
| | characteristic of human auditory sensation. This function should
| | only be used at low volume. It also has effect on the signal of the
| | output “PRE OUT” (10).
Operation| Button(s)| Description
---|---|---
Mix in a| MIC VOL| With this dial you change the volume of the
microphone signal
microphone signal| (3)| and thereby determine how loud the microphone
signal is in the
| | final mix with the sources (karaoke function).
| | If no microphone is used, it is recommended that the dial be set to
| | its minimum.
Add echo to the| DIGITAL ECHO| If this dial is turned in a clockwise
direction, echo will be added to
microphone signal| (4)| the microphone signal with increasing intensity.
If no echo is desi-
| | red, then this dial must be turned in anticlockwise direction right to
| | its end position. If no microphone is connected, then this setting
| | has no effect.
TECHNICAL SPECIFICATIONS
- Frequency Response : 20 Hz – 20 kHz (3dB)
- Nominal output power (music power) into 4 Ohm : 2 x 75 W
- Input Impedance (RCA inputs): 150 mV („SIGNAL IN“=HIGH) 300 mV („SIGNAL IN“=LOW)
- Input Impedance (microphone input ): 3 mV
- Total Harmonic Distortion : < 0.1%
- Signal-Noise-Ratio : > 88 dB
- Power Connection Type : 220 V AC, 50/60 Hz
- Inputs: 2x RCA stereo, 1x microphone jack 6,3mm
- Outputs : 1x REC RCA stereo, 1 x BT, screw sockets for 2 speakers
- Power consumption: in OFF-mode <0,4 W in auto standby mode <0,4 W No networked standby
- Dimensions (W x H x D): 220 x 50 x 230 mm
- Weight : 2,1 kg
- Colour : black/silver
Sintron Distribution GmbH hereby declares that this product complies with the Radio Equipment Directive 2014/53/EU. The corresponding EU declaration of conformity is available at the following internet address: www.sintron.de/KE
Internationaler Distributor:
Sintron Distribution GmbH · Südring 14 · D-76473 Iffezheim WEEE-Reg.Nr.: DE
70051477
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>