Short answer: the KRK Classic 5. It ranks #72 of 100 powered bookshelf speakers by sound quality, rated 3.4/5, at $319.99; the Audioengine HD6 ranks #77, rated 3.3/5, and costs $1,048, so there is not much of a tradeoff to weigh.
The case for the KRK Classic 5: ASR’s Klippel data gives -3dB bass around 60Hz and a 5.99 preference score with an ideal subwoofer. It has an adjustable EQ, which the Audioengine HD6 lacks. The tradeoff: The native standalone score is 3.47 and the midrange span is a large 6.5dB.
What the Audioengine HD6 does well: Analog and optical inputs, RCA output and built-in amplification provide a convenient self-contained stereo setup. It keeps a wired aux input, which the KRK Classic 5 lacks. The catch: Listening impressions describe bass and treble emphasis with a recessed midrange, which may suit casual listening better than neutral monitoring.
Buy the KRK Classic 5. It is rated higher for sound quality than the Audioengine HD6 and costs less, so only choose the other one for a particular feature it does better.
Still deciding? The full Powered Home rankings cover every ranked option.
Specifications Side By Side
| KRK Classic 5 | Audioengine HD6 | |
|---|---|---|
| Price | $319.99 per pair | $1,048.00 per pair |
| Ranked | #72 of 100 in Medium Size Powered Bookshelf Speakers | #77 of 100 in Medium Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 60.1Hz (Spinorama/Audio Science Review) | - |
| Bass Extension (-6dB) | 54.2Hz (Spinorama/Audio Science Review) | - |
| Spinorama Preference Score | 3.47 | - |
| Dimensions | 9.7”H x 7.4”W x 11.2”D (246.4 x 188 x 284.5 mm) | 11.7”H x 7.2”W x 10”D (298.4 x 184.1 x 254 mm) |
| Frequency Response | 56Hz-30kHz (+-3dB) (Manufacturer specified) | 45Hz-40kHz (-3dB) (Manufacturer specified) |
| Inputs | RCA, TRS, XLR | Bluetooth, Aux, RCA Input, Digital Optical |
| Weight | 12.9 lbs (5.87 kg) | 17.4 lbs (7.9 kg) |
| Drivers | 5” (127mm) woofer | 5.5” (140mm) woofer |
| App | No | No |
| Bluetooth | No | Yes |
| EQ | Yes (Room adjustment) | No |
| Amplifier Power | 50w RMS Per Speaker | 50w RMS Per Speaker |
| Spinorama Preference Score with Perfect Sub | 5.99 | - |
| XLR Input | Yes | No |
| RCA Input | Yes | Yes |
| TRS Input | Yes | No |
| Optical Input | No | Yes |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | Yes |
| Outputs | - | RCA variable output (subwoofer) |
| Bluetooth Version | - | 5.0 |
| Bluetooth Codecs | - | SBC, AAC, aptX, aptX HD |
| Subwoofer Output | - | Yes |
Related Speaker Comparisons
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- KRK Classic 5 vs Reflector Audio Square Two
Prices on this page were last checked October 7, 2026 at 9:25 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
KRK Classic 5: $319.99 per pair Amazon eBay
Pros: ASR’s Klippel data gives -3dB bass around 60Hz and a 5.99 preference score with an ideal subwoofer. Broad tonal correction can improve it, so it may be useful to someone willing to measure and EQ a basic studio setup. Measured bass extension of 60.1Hz (-3dB).
Cons: The native standalone score is 3.47 and the midrange span is a large 6.5dB. Excess treble and crossover/directivity errors keep it from being neutral out of the box, while low-bass distortion limits loud playback. Modeled EQ scores are not stock performance and do not demonstrate corrected distortion or dispersion.
Full KRK Classic 5 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 50w RMS Per Speaker |
| App | No |
| Aux Input | No |
| Bass Extension (-3dB) | 60.1Hz (Spinorama/Audio Science Review) |
| Bass Extension (-6dB) | 54.2Hz (Spinorama/Audio Science Review) |
| Bluetooth | No |
| Coaxial Input | No |
| Dimensions | 9.7”H x 7.4”W x 11.2”D (246.4 x 188 x 284.5 mm) |
| Drivers | 5” (127mm) woofer |
| EQ | Yes (Room adjustment) |
| Frequency Response | 56Hz-30kHz (+-3dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | RCA, TRS, XLR |
| Optical Input | No |
| RCA Input | Yes |
| Spinorama Preference Score | 3.47 |
| Spinorama Preference Score with Perfect Sub | 5.99 |
| TRS Input | Yes |
| USB Input | No |
| Weight | 12.9 lbs (5.87 kg) |
| XLR Input | Yes |
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- Audio Science Review Measurements (spinorama.org)
- Head-to-Head Comparisons
Audioengine HD6: $1,048.00 per pair Amazon eBay
Same family: the Audioengine HD3 (smaller bookshelf, rated 3.2/5) and the Audioengine HD4 (smaller bookshelf, ranked lower, rated 3.2/5).
Pros: Analog and optical inputs, RCA output and built-in amplification provide a convenient self-contained stereo setup. The cabinet and driver size can be practical for general music listening without assembling a separate amplifier system.
Cons: Listening impressions describe bass and treble emphasis with a recessed midrange, which may suit casual listening better than neutral monitoring.
Full Audioengine HD6 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 50w RMS Per Speaker |
| App | No |
| Aux Input | Yes |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC, aptX, aptX HD |
| Bluetooth Version | 5.0 |
| Coaxial Input | No |
| Dimensions | 11.7”H x 7.2”W x 10”D (298.4 x 184.1 x 254 mm) |
| Drivers | 5.5” (140mm) woofer |
| EQ | No |
| Frequency Response | 45Hz-40kHz (-3dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | Bluetooth, Aux, RCA Input, Digital Optical |
| Optical Input | Yes |
| Outputs | RCA variable output (subwoofer) |
| RCA Input | Yes |
| Subwoofer Output | Yes |
| TRS Input | No |
| USB Input | No |
| Weight | 17.4 lbs (7.9 kg) |
| XLR Input | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons