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Pair of black wooden speakers with leather finish and visible drivers

Microlab

Microlab SP-H21BK 36W 2.0 Bluetooth speaker

SKU CH-NA9B-SVX1P MPN SP-H21BK

A 36 Watt two-way stereo speaker pair with Bluetooth 2.1, 3.5 inch woofers, silk dome tweeters and wooden cabinets

  • Channel configuration2.0
  • Total wattage36 W
  • RMS power per satelliteAmplifier: 18 W x 2RMS
  • Subwoofer RMS powerTweeter: 10 W Woofer: 20 W
  • Driver unitWoofer drive unit: 3.5 in Tweeter drive unit: 1 in
  • Frequency range50 Hz - 20 kHz
  • Bluetooth 2.1 wireless streaming from phones and laptops
  • 36 W total power fills a room with clear sound
  • Two-way drivers with 3.5" woofers and 1" silk dome tweeters cover 50 Hz – 20 kHz
  • Wooden cabinets with leather finish suit desktop setups
  • Multiple inputs include RCA, 3.5 mm and binding posts

Two-channel Bluetooth desktop speaker

The Microlab SP-H21BK is a 2.0 stereo pair designed for desktop or small-room listening. Each cabinet houses a 3.5 inch woofer and a 1 inch silk dome tweeter in a two-way layout. A CSR Bluetooth 2.1 chipset handles wireless streaming with A2DP and AVRCP profiles. The system delivers 36 watt total RMS power from a built-in amplifier.

Bluetooth 2.1 bandwidth and codec limits

Wireless audio uses Bluetooth 2.1 with EDR, A2DP and AVRCP profiles. This version caps practical stereo bitrate well below lossless quality, so high-resolution files are transcoded. Range is the typical short-room distance for class 2 radios. Wired analogue input via RCA bypasses the codec entirely for cleaner signal path.

36 watt headroom and bass extension

The 18 watt per channel amplifier drives woofers rated to 50 hertz low-frequency response. At moderate volumes the pair fills a desktop or small bedroom with clear mids and adequate bass weight. Pushed hard the 3.5 inch drivers reach excursion limits and low-end output rolls off. Large rooms or party-level SPL exceed the available headroom.

How it compares

Measured against everything we stock in Desktop Speakers & Soundbars, at today’s prices. Recalculated every night.

Price $92.99
Pricier than about 83% of the 830 comparable items (median $40.99).

Specifications

Product
Brand nameMicrolab
Model nameSP-H21BK
Audio & video
Channel configuration2.0
RMS power per satelliteAmplifier: 18 W x 2RMS
Driver unitWoofer drive unit: 3.5 in
Tweeter drive unit: 1 in
Frequency range50 Hz - 20 kHz
Rated impedanceTweeter: 4 ohms
Woofer: 8 ohms
Signal-to-noise ratio> 70 dB
Power
Total wattage36 W
Subwoofer RMS powerTweeter: 10 W
Woofer: 20 W
Power supplyAC 100 V-240 V, 50/60 Hz
Size & build
MeasurementsRight: 7.9 in × 7.7 in × 4.5 in, Left: 7.9 in × 7.4 in × 4.5 in
Product weight10.36 lb (4.7 kg)
Shipping weight5.19 kg
Package size340 × 241 × 234 mm
In the box
In the boxH21 speakers x 2 pcs
Speaker interconnect cable, 3 m
AC power adapter
3.5 mm stereo to 2RCA cable, 1.8 m
User manual

Questions about this item

Should I pick the 36 W 2.0 set or a lower-power model for a small desk?

The 36 W total output comes from two 18 W RMS amplifiers driving 3.5 inch woofers and 1 inch silk dome tweeters, so it fills a typical room without needing a separate subwoofer.

What does 36 W total power actually deliver at my listening position?

Each satellite provides 18 W RMS to its own woofer and tweeter, giving stereo sound with 50 Hz to 20 kHz frequency response and over 70 dB signal-to-noise ratio.

Does Bluetooth 2.1 limit audio quality or range compared with newer versions?

Bluetooth 2.1 with EDR, A2DP and AVRCP streams stereo audio wirelessly; the 2.0 speakers also accept analogue input via the included 3.5 mm to 2 RCA cable.

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