Harman Kardon Onyx Studio 6 vs W-King D20

Last updated: October 12, 2026

Short answer: the Harman Kardon Onyx Studio 9, if you are buying new. The Harman Kardon Onyx Studio 6 ranks higher than the W-King D20 (#13 vs #39 of 98 boombox speakers) but is discontinued; its replacement, the Harman Kardon Onyx Studio 9, is rated 4.1/5 at $189.99 and is still sold new.

Harman Kardon Onyx Studio 6 vs W-King D20

The Harman Kardon Onyx Studio 6 is the better-sounding, deeper-bass choice. Harman Kardon Onyx Studio 6 uses a 120mm woofer, 25mm tweeter and passive radiator. Its bass reaches about 37Hz before falling 10dB, against 42Hz for the W-King D20. At 6.5 lbs (2.94 kg) it weighs much less than the W-King D20 at 14.3 lbs (6.5 kg). It links with other speakers (Wireless Dual Sound), which the W-King D20 cannot. The tradeoff: Warm tuning with boosted bass, and not as loud as others.

The W-King D20 is the louder, longer-running choice. Comes with 2 wireless microphones. Alan Ross Reviews measured it at 112dB at full volume, against 96dB for the Harman Kardon Onyx Studio 6. It is rated for 24 hours of battery against 8 for the Harman Kardon Onyx Studio 6. It has an adjustable EQ, which the Harman Kardon Onyx Studio 6 lacks. The catch: Rising frequency response but upper treble rolled off, 700Hz and 1.2kHz peaks.

Buy the Harman Kardon Onyx Studio 9, the replacement for the discontinued Harman Kardon Onyx Studio 6; it is rated higher for sound quality than the W-King D20.

Looking for alternatives? See the complete Portable Bluetooth rankings.

Check Harman Kardon Onyx Studio 6 price at Amazon ($130) →Check W-King D20 price at AliExpress ($193) →

Specifications Side By Side

Harman Kardon Onyx Studio 6 W-King D20
Price$130 Discontinued$193
Ranked#13 of 98 in Boombox Size Portable Bluetooth Speakers#39 of 98 in Boombox Size Portable Bluetooth Speakers
Aux InputYesYes
Bass Extension (-10dB)37Hz~42Hz
Battery Life8 hours (Manufacturer specified)24 hours (Manufacturer specified)
Built-in MicrophoneYesNo
IP RatingIPX7IPX6
Bluetooth Latency180ms-
Maximum SPL96dB (measured by Alan Ross Reviews)112dB (measured by Alan Ross Reviews)
Party ModeYes (Wireless Dual Sound)No
Power InputDC Barrel Connector (19V/2A)USB-C
StereoNoYes
OmnidirectionalNoNo
TWSYes (see https://www.reddit.com/r/Bluetooth_Speakers/comments/w339x5/how_to_harman_kardon_onyx_studio_5_6_dual_sound/)Yes
Weight6.5 lbs (2.94 kg)14.3 lbs (6500 g)
BluetoothYesYes
Bluetooth CodecsSBCSBC
AppNoYes (W-King app)
EQNoYes (App + button modes)
Power BankNoYes
USB PlaybackNoYes
Bluetooth Version4.25.3
Amplifier Power50W RMS200W
Dimensions5” x 11.5” x 11.2” (128 x 291 x 284 mm)19.9” x 8.5” x 10.6” (506 x 217 x 270 mm)
Drivers1x 120mm (4.7”) woofer + 1x 25mm (1”) tweeter + 1x passive radiator4.5” + 3.5” drivers + 1.2” tweeters
Digital Aux InputNoNo
StrapNo-
MicroSD Playback-Yes
Wireless Microphones-Yes
Check Harman Kardon Onyx Studio 6 price at Amazon ($130) →Check W-King D20 price at AliExpress ($193) →

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The Two Speakers In Full

Harman Kardon Onyx Studio 6: $130 Discontinued Amazon $130 eBay

Harman Kardon Onyx Studio 6 ranking card

Newer model: the Harman Kardon Onyx Studio 9, ranked lower, rated 4.1/5, released Dec 2024.

Older models: the Harman Kardon Onyx Studio 5 (ranked lower, rated 3.9/5) and the Harman Kardon Onyx Studio 4 (rated 3.3/5). See every Harman Kardon Onyx Studio generation.

Pros: Harman Kardon Onyx Studio 6 uses a 120mm woofer, 25mm tweeter and passive radiator. Its 2.94 kg, claimed 8 hours (Manufacturer specified) battery life, IPX7 protection, aux input and up to 96dB make it a practical option for its intended room or portable use. Measured bass extension of 37Hz (-10dB).

Cons: Bass is limited by its 37Hz specification. There is no companion app. No EQ adjustment. Warm tuning with boosted bass, and not as loud as others. Discontinued.

Full Harman Kardon Onyx Studio 6 review and specifications →

ReleasedSep 2019 (7 years ago)
Amplifier Power50W RMS
AppNo
Aux InputYes
Bass Extension (-10dB)37Hz
Battery Life8 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC
Bluetooth Latency180ms
Bluetooth Version4.2
Built-in MicrophoneYes
Digital Aux InputNo
Dimensions5” x 11.5” x 11.2” (128 x 291 x 284 mm)
Drivers1x 120mm (4.7”) woofer + 1x 25mm (1”) tweeter + 1x passive radiator
EQNo
IP RatingIPX7
Maximum SPL96dB (measured by Alan Ross Reviews)
OmnidirectionalNo
Party ModeYes (Wireless Dual Sound)
Power BankNo
Power InputDC Barrel Connector (19V/2A)
StereoNo
StrapNo
TWSYes (see https://www.reddit.com/r/Bluetooth_Speakers/comments/w339x5/how_to_harman_kardon_onyx_studio_5_6_dual_sound/)
USB PlaybackNo
Weight6.5 lbs (2.94 kg)
Check current price at Amazon ($130) →Search eBay for Harman Kardon Onyx Studio 6 →

W-King D20: $193 AliExpress $193 eBay

W-King D20 ranking card

Pros: Comes with 2 wireless microphones. Measured bass extension of ~42Hz (-10dB).

Cons: Rising frequency response but upper treble rolled off, 700Hz and 1.2kHz peaks

Full W-King D20 review and specifications →

ReleasedFeb 2024 (2 years ago)
Amplifier Power200W
AppYes (W-King app)
Aux InputYes
Bass Extension (-10dB)~42Hz
Battery Life24 hours (Manufacturer specified)
BluetoothYes
Bluetooth CodecsSBC
Bluetooth Version5.3
Built-in MicrophoneNo
Digital Aux InputNo
Dimensions19.9” x 8.5” x 10.6” (506 x 217 x 270 mm)
Drivers4.5” + 3.5” drivers + 1.2” tweeters
EQYes (App + button modes)
IP RatingIPX6
Maximum SPL112dB (measured by Alan Ross Reviews)
MicroSD PlaybackYes
OmnidirectionalNo
Party ModeNo
Power BankYes
Power InputUSB-C
StereoYes
TWSYes
USB PlaybackYes
Weight14.3 lbs (6500 g)
Wireless MicrophonesYes
Check current price at AliExpress ($193) →Search eBay for W-King D20 →