We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green rectangular circuit board with silver heatsinks and blue potentiometers, 4.72 by 3.94 by .7 inches

ZK-TB21 2.1CH 50W x 2 +100W Audio Amplifier Board

SKU CH-DXXN-RQD3J

A 2.1 channel Bluetooth 5.0 amplifier board delivering 50W per satellite and 100W to a subwoofer with treble and bass controls

  • 1 channel stereo output with 50W x 2 + 100W power
  • Bluetooth 5.0 wireless streaming plus AUX input for flexible connectivity
  • Independent treble and bass controls adjust tone directly on the board
  • Over-voltage, under-voltage, over-heat and short-circuit protection built in
  • Compact 4.72 in x 3.94 in x .7 in size simplifies DIY installation

Bluetooth 5.0 Amplifier Board

This compact board delivers 2.1-channel stereo output with 50W per satellite channel and 100W for the subwoofer. It accepts wireless Bluetooth 5.0 streams and wired AUX input for versatile connectivity. Integrated treble and bass controls let you shape the sound directly on the module. The small footprint of 4.72 by 3.94 by .7 inches suits DIY speaker builds.

Sustained Load Behaviour

Built-in over-voltage, under-voltage, over-heat and short-circuit protections engage automatically during extended high-power operation. The shielding power inductance and low-noise front-stage operational amplifier keep distortion low even when the amplifier runs near its 200W total rating. Adequate supply voltage and current are required to maintain rated output without triggering protection circuits.

Pre-Installation Checks

Verify your power supply can deliver sufficient voltage and current for the desired output level. Confirm that speaker impedances match the amplifier’s design to avoid reduced power or instability. Remember to disconnect any Bluetooth pairing before switching to AUX input. The printed interface labels on the protective plate aid wiring but assume basic soldering or connector skills.

Highlights

  • 1 channel stereo output with 50W x 2 + 100W power
  • Bluetooth 5.0 wireless streaming plus AUX input for flexible connectivity
  • Independent treble and bass controls adjust tone directly on the board
  • Over-voltage, under-voltage, over-heat and short-circuit protection built in
  • Compact 4.72 in x 3.94 in x .7 in size simplifies DIY installation

Specifications

No published specifications for this item yet.

Questions about this item

How much heat does the ZK-TB21 amplifier generate when running continuously at full power?

The board includes over-heat protection that shuts it down if temperatures exceed safe limits, and the metal case helps dissipate heat during extended use.

What power supply do I need to provide for the ZK-TB21 to deliver its rated 50W x 2 plus 100W output?

You must supply a DC source with sufficient voltage and current; the manufacturer notes that adequate output power depends on the power supply voltage and current being sufficient.

Can I connect my older passive speakers and subwoofer directly to the ZK-TB21 speaker terminals?

Yes, the board provides 2.1 channel stereo output terminals for two satellite speakers and one subwoofer, compatible with typical passive speaker impedances.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.