JOYO BSK-80 Acoustic Guitar Amplifier

User Manual

www.joyoaudio.com

Product Introduction

Thank you for purchasing the JOYO BSK-80 acoustic guitar amplifier. The BSK-80 amp is specially designed for acoustic guitar, with an EQ curve tailor-made for acoustic guitar, offering a nice and bright treble with rich mid-low frequencies. Its 80W (RMS) power can meet your needs for small live shows or home practice.

Compared with similar products from rivals, its tone is stunning, featuring a built-in high-performance DSP chip with several DSP digital effects (CHORUS, DELAY, REVERB, ANTI-FEEDBACK). These DSP digital effects can be used simultaneously, which is rare among similar products from rivals. Moreover, the BSK-80 has a mic input channel with an optimized mic amplification circuit, providing a special frequency response for vocals, making the human voice signal much clearer and stronger. The mic channel also features an independent reverb effect to enhance your singing. Like most guitar amps, the BSK-80 has an AUX IN jack for connecting a CD player or MP3 to jam along or practice. It also includes LOOPER recording and playback functions, Bluetooth accompaniment function, LINK function, host function, LINE IN function, LINE OUT function, BALANCED OUT function, and a DC OUT function (supplies power to pedals) (DC 9V/500mA). A footswitch pedal, synchronized with the main unit, is also included in the packing list.

SPECIAL NOTE: Should your BSK-80 Acoustic Guitar Amplifier require servicing, a Return Authorization (RA) number is necessary. Without this number, the unit will not be accepted. Please retain the original packing materials and call JOYO at 0755-29765393 before sending out the unit. Return the unit in its original carton and packing materials.

Features

RMS: 80W
Built-in lithium battery for charging, facilitating outdoor use.
DC 9V OUTPUT (500mA MAX) for powering low-power consumption pedals (current consumption < 300mA).
Dual Channel for Guitar and Mic.
Independent Mic Reverb and Guitar Reverb Effects.
3 Guitar Effects can be used simultaneously (CHORUS, DELAY with TAP TEMPO, REVERB).
Built-in Guitar Anti-feedback function.
Built-in Guitar Signal Phase Inverter Function.
Quick-mute function.
Built-in LOOPER with 30 seconds' recording time and unlimited overdubbing.
Bluetooth 4.0 for music playing.
Built-in audio interface to connect to smartphones for guitar tone apps (iOS or some Android devices).
Recording Out for live streaming.
LINE IN and LINE OUT for connecting to other amps.
XLR Jack for connecting to a mixer.
A unique JOYO Footswitch pedal is included, which can sync the main unit's status.

Detailed Safety Instructions

Use the attached power adapter only. It has passed strict tests and safety certificates. Using other power adapters may increase noise or damage internal circuits or the built-in battery.
Do not expose the product to damp areas such as bathtubs, toilets, sinks, or swimming pools. Avoid spilling liquid substances into the product, as this may lead to malfunction or electric shock.
Do not use this product in places with flammable and explosive gases, such as gas stations or dusty areas.
Use only the BSK-80's attached AC power adapter. Other adapters might not be compatible with the BSK-80's input voltage, potentially damaging the unit or worse.
The BSK-80's attached adapter has passed relevant electromagnetic compatibility tests and safety certificates. Using other power adapters may mean they do not meet your country or region's compulsory safety certification standards.
If the attached power adapter is broken and needs replacement, ensure the new adapter has the same power source polarity and maximum power as the original.
To save energy, unplug the power switch after use.
Do not use alcohol or other cleaning fluids to clean this product, as they may damage the surface. Use a clean, dry cloth when necessary.
Do not open the case for any reason. Contact professional maintenance personnel if malfunctions occur, or contact your local retailer for maintenance.
Do not pull the power cord or other parts of this product to avoid damage to the power cord and plugs.
Please turn off this product and unplug it during thunderstorms, lightning, or when not in use for extended periods.
Do not collide, throw, or vibrate this equipment.
To protect the built-in battery, ensure it is fully charged if not in use for a long time, and recharge it every 2 months.
If the battery indicator shows low battery, please charge it promptly. Over-discharge and low battery levels can cause irreversible loss to battery capacity and damage the battery.
Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer or sold with the apparatus. When using a cart, exercise caution when moving the cart/apparatus combination to avoid injury from tip-over.

Panel

Front Panel / Footswitch Pedal Panel

The front panel features controls for the Guitar Channel, Mic Channel, and various functions. The footswitch pedal provides remote control for some functions.

Guitar Channel Controls:

Guitar Input Jack: 6.35mm input for guitar.
PHASE button: Turns the phase inverter function on or off. This function can also be operated from the footswitch pedal.
VOLUME: Controls the volume for the guitar channel.
BASS: Adjusts the bass frequencies. Turn counter-clockwise to decrease, clockwise to increase.
MIDDLE: Adjusts the middle frequencies. Turn counter-clockwise to decrease, clockwise to increase.
TREBLE: Adjusts the treble frequencies. Turn counter-clockwise to decrease, clockwise to increase.
CHORUS: Adjusts the depth of the CHORUS effect. If connected to an external footswitch pedal, this knob may be temporarily inactive, with adjustment only possible via the footswitch.
REVERB: Adjusts the ratio of dry and wet signal for the reverb effect. If connected to an external footswitch pedal, this knob may be temporarily inactive, with adjustment only possible via the footswitch.
Delay time control: Adjusts the delay time. If connected to an external footswitch pedal, this knob may be temporarily inactive, with adjustment only possible via the footswitch. The delay time can also be set using the TAP TEMPO button.
TAP TEMPO button: Allows setting the delay time by double-clicking the button twice in quick succession.
SCAN button: Auto feedback frequency searching button. Refer to the feedback suppressor operation section for details.
ANTI-FEEDBACK knob: Controls the ANTI-FEEDBACK function. Refer to the feedback suppressor operation section for details.

Mic Channel Controls:

Mic Input Jack (INPUT): Balanced signal input jack (XLR) for microphone input.
Mic's volume control (MIC/VOLUME): Adjusts the microphone channel's volume.
Mic's BASS: Adjusts the bass frequencies for the microphone channel. Turn counter-clockwise to suppress, clockwise to boost.
Mic's TREBLE: Adjusts the treble frequencies for the microphone channel. Turn counter-clockwise to suppress, clockwise to boost.
REVERB: Adjusts the microphone's reverb effect.

General Controls:

LOOPER Button: For recording and playback of the built-in looper. Refer to the built-in LOOPER operation section for details.
Bluetooth function switch: Long press to turn on Bluetooth. The Bluetooth indicator will flicker. Connect to Bluetooth; the indicator will be solid when connected and playing music. Tap and hold again to turn off Bluetooth connection.
LINK button and Jack (3.5mm TRRS): Can be used as an audio jack for portable devices. Connect to a smartphone using the provided audio cable. Ensure your smartphone has audio processing apps like JamUp or AmpliTube installed. When this switch is turned on, the internal signal is transmitted to the smartphone. The BSK-80 will have no sound or noise if this switch is pressed when not connected to external devices.
MASTER Volume Control: Adjusts the unit's overall volume.
MUTE button: Turns the MUTE mode on or off. This button may be temporarily inactive if an external footswitch pedal is used, in which case mute control is handled by the footswitch.
Charging indicator: Indicates battery charging status. Refer to the battery maintenance section for details.
Power: Connects to the AC100-240V adapter.
Power switch (POWER): Turns the unit on or off.
TO AMP Jack: Connects to an amplifier's footswitch jack.
PHASE INV/A.F. BACK SCAN switch: Refer to the section on connecting the BSK-80 to an external footswitch pedal for details.

Rear Panel

The rear panel provides various input and output connections.

DC IN Mains Input: Connects to the DC 24V/3.75A adapter (center positive).
DC OUT Mains Output: DC9V/500mA mains output, used to supply power to pedals.
PORT: Tape recording signal output jack, designed for smartphone live streaming users. Connects to a smartphone to supply the BSK-80's internal audio signal.
AUX IN (Input): Stereo headphone input jack (3.5mm) for connecting external sound sources like CD players or MP3 players.
FOOTSWITCH Jack: Connects to a 6.35mm stereo jack footswitch.
PHONES Jack: For connecting headphones with a 6.35mm jack. Supports headphones with impedance above 32 Ω.
LINE IN (6.35mm Jack): Line input jack, used for connecting to another device's LINE OUT or to another BSK-80's LINE OUT jack for expanding cascade.
LINE OUT (6.35mm Jack): Line output jack, used for connecting to another device's LINE IN or to another BSK-80's LINE IN jack for expanding cascade.
BALANCED OUT: Standard balanced output jack, supporting balanced signal output for longer transmission distance and improved anti-interference ability.

Built-in LOOPER's Instructions

The LOOPER function allows for recording and playback of audio loops.

Record: Press the LOOPER button when there is no recording data. The LOOPER indicator turns red and starts recording. Press the button again to stop recording. The LOOPER stops recording and switches to play status, with the indicator turning blue.
Play: Press the LOOPER button while playing or dubbing to switch to play status. The indicator becomes blue.
Dub: Press the LOOPER button while playing to switch to dub status. The indicator turns red. Press the button again when dubbing is finished to exit dubbing and return to play mode.
Stop: Tap the LOOPER button twice in a row while recording or dubbing to switch to stop mode. The LOOPER turns off. Tap the LOOPER button again when stopped to return to play mode.
Revoke dubbing/Recover the dubbing: If you are not satisfied with the quality of the last dubbed part, press and hold the LOOPER button for over 1 second while playing until the LOOPER indicator starts to flicker. The last dubbed part will be revoked, returning the recording to the previous status and then to play mode. To cancel this revoke and recover the last dubbed part, press and hold the LOOPER button until the indicator flickers again. Note that only the most recent recording can be revoked or recovered.
Delete recording completely: Double-click the LOOPER button and hold until the red indicator begins to flicker quickly, then release the button to delete all recordings.
Use external footswitch pedal to control LOOPER function: Refer to the instructions for connecting the BSK-80 to an external footswitch pedal section.

Instructions for Feedback Suppressor

The BSK-80 features an anti-feedback function that reduces feedback when the guitar produces it. You can turn on or adjust the feedback suppressor using the following methods:

1. Search for feedback frequency manually

You can rotate the ANTI-FEEDBACK knob (between L-H) to manually search for a suitable feedback frequency point. The feedback diminishes or disappears immediately once it reaches the correct frequency point.

2. Auto-search feedback frequency

Adjust the knob to the AUTO position.
Tap the SCAN switch once to start the search. The ANTI-FEEDBACK indicator will flicker.
The indicator starts to flicker rapidly when searching. If feedback is successfully searched, the indicator will return to a slower flicker. If the search fails, the indicator will flicker every second. You can press the SCAN button again to search again. If it fails multiple times, you can switch to manual mode.

Note: The BSK-80's auto-searching speed is high. The indicator flashing quickly during search is normal.

3. Use external footswitch pedal to operate the feedback suppressor

You can use an external footswitch pedal to activate the BSK-80's feedback suppressor. Refer to the connection section for details.

Note: BSK-80's anti-feedback works automatically to a degree. If it doesn't seem to work, try these methods to enhance the success ratio:

Check your channel's gain or guitar output signal; ensure gain or volume are at a reasonable range.
Use your guitar's built-in PHASE INVERTER (if available) or the BSK-80's PHASE INVERTER function to switch the signal's phase, which can help break oscillating loops.
Adjust the distance or direction of your guitar and amplifier.

The Instructions for Connecting BSK-80 to External Footswitch Pedal

Note: Connecting the BSK-80 to an external footswitch pedal does not support hot-plugging. To use the external footswitch pedal, connect the main unit and the footswitch pedal using the attached connecting cable while the BSK-80 is turned off.

Connection Procedure:

Turn off the main unit first, then connect the footswitch pedal to the main unit. [✔️]
Turn on the main unit first, then connect the footswitch pedal to the main unit. [❌]

Note: Related panel knobs or switches may fail temporarily when an external footswitch pedal is connected. You can adjust some BSK-80 parameters through the footswitch pedal only.

1. Check up the connection of footswitch pedal and main unit

First, turn off the main unit. Then, use the attached connecting cable to connect the main unit and the footswitch pedal. Turn on the main unit. Once powered on, there will be a brief communication between the main unit and the footswitch pedal to confirm connection. If successfully connected, all indicators will flicker quickly 3 times. If the footswitch pedal fails to connect, all its indicators will flicker every second, indicating communication failure. Check if the cable is broken, or if the plug is fully inserted into the socket.

2. The attached connecting cable for the footswitch pedal

A 2-meter connecting cable is included. If the cable is not long enough, you can use a standard stereo audio cable of similar quality. The cable length should not exceed 5 meters. Ensure it is of high quality for smooth signal transfer. If the footswitch pedal does not recognize the signal, try shortening the cable or using a higher quality one.

3. Instructions for Footswitch Functions

LOOPER switch: Tap the LOOPER footswitch to control the built-in LOOPER function. Operation is the same as the main unit panel. The footswitch pedal's indicator flickers according to the main unit (there might be a slight delay).
MUTE switch: The indicators on the panel and footswitch illuminate or go out simultaneously when you tap to turn the mute function on or off.
PHASE INV / A.F.BACK SCAN switch: This is a multifunction switch for controlling the SIGNAL PHASE INVERTER and FEEDBACK suppressor. Tap this switch twice to turn on the SIGNAL PHASE INVERTER when the FEEDBACK suppressor is not active. The PHASE INV indicator and the main unit's PHASE indicator will turn on, showing the signal has been inverted.

Note: If the footswitch pedal's FEEDBACK suppressor is active, the PHASE INVERTER cannot be used temporarily. Turn off and exit the FEEDBACK suppressor first, then operate the PHASE INVERTER.

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