Short answer: the Audioengine HD6. It ranks #77 of 100 powered bookshelf speakers by sound quality (rated 3.3/5) at $1,048 and is still sold new; the NHT Pro M-00 ranks #98 (rated 1.7/5) and is discontinued, so it is only an option used.
The case for the NHT Pro M-00: A sturdy metal enclosure, analog studio/consumer connections and selectable nearfield/farfield voicing give it practical features as an older powered monitor. The catch: The review identifies a pronounced upper-bass cancellation, treble peaks and problematic vertical response, and strongly prefers the JBL 305P MKII in direct listening.
The Audioengine HD6 is the better-sounding option. 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 NHT Pro M-00 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 Audioengine HD6. It is rated higher for sound quality; the NHT Pro M-00 is no longer sold new.
Looking for alternatives? See the complete Powered Home rankings.
Specifications Side By Side
| NHT Pro M-00 | Audioengine HD6 | |
|---|---|---|
| Price | $498 per pair (used market; originally $249 each), Discontinued | $1,048.00 per pair |
| Ranked | #98 of 100 in Medium Size Powered Bookshelf Speakers | #77 of 100 in Medium Size Powered Bookshelf Speakers |
| Drivers | 1” ferrofluid-cooled fabric dome tweeter, 4.5” treated paper-cone woofer | 5.5” (140mm) woofer |
| Dimensions | 9H x 5.7W x 7.3D in | 11.7”H x 7.2”W x 10”D (298.4 x 184.1 x 254 mm) |
| Weight | 14 lbs (6.35 kg) each | 17.4 lbs (7.9 kg) |
| Amplifier Power | 75W RMS continuous, 150W peak (per speaker) | 50w RMS Per Speaker |
| Inputs | RCA, XLR/TRS | Bluetooth, Aux, RCA Input, Digital Optical |
| App | No | No |
| Bluetooth | No | Yes |
| DSP | No | - |
| Bass Extension (-3dB) | 83.3Hz (measured, Audio Science Review) | - |
| Bass Extension (-10dB) | 59.7Hz (measured, Audio Science Review) | - |
| 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 |
| Frequency Response | 98Hz - 20kHz (Manufacturer specified) | 45Hz-40kHz (-3dB) (Manufacturer specified) |
| Outputs | - | RCA variable output (subwoofer) |
| Bluetooth Version | - | 5.0 |
| Bluetooth Codecs | - | SBC, AAC, aptX, aptX HD |
| EQ | - | No |
| Subwoofer Output | - | Yes |
Related Speaker Comparisons
How Audioengine HD6 compares with other leading options:
- Genelec 8331A vs Audioengine HD6
- Neumann KH120 MKII vs Audioengine HD6
- Genelec 8030C vs Audioengine HD6
- Neumann KH80 DSP vs Audioengine HD6
- Dynaudio LYD 5 vs Audioengine HD6
Prices on this page were last checked October 9, 2026 at 8:01 AM 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
NHT Pro M-00: $498 per pair (used market; originally $249 each) Discontinued eBay
Pros: A sturdy metal enclosure, analog studio/consumer connections and selectable nearfield/farfield voicing give it practical features as an older powered monitor. Measured bass extension of 83.3Hz (-3dB).
Cons: The review identifies a pronounced upper-bass cancellation, treble peaks and problematic vertical response, and strongly prefers the JBL 305P MKII in direct listening. Discontinued.
Full NHT Pro M-00 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 75W RMS continuous, 150W peak (per speaker) |
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 59.7Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 83.3Hz (measured, Audio Science Review) |
| Bluetooth | No |
| Coaxial Input | No |
| DSP | No |
| Dimensions | 9H x 5.7W x 7.3D in |
| Drivers | 1” ferrofluid-cooled fabric dome tweeter, 4.5” treated paper-cone woofer |
| Frequency Response | 98Hz - 20kHz (Manufacturer specified) |
| HDMI Input | No |
| Inputs | RCA, XLR/TRS |
| Optical Input | No |
| RCA Input | Yes |
| TRS Input | Yes |
| USB Input | No |
| Weight | 14 lbs (6.35 kg) each |
| XLR Input | Yes |
- Reviews, Comparisons and Sound Samples
- 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
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