Short answer: the Audioengine HD6 for better sound quality, the NHT Pro M-00 for the lower price. The Audioengine HD6 ranks #41 of 64 powered bookshelf speakers at $817.44. The NHT Pro M-00 ranks #64 at $498, $319.44 cheaper.
What the NHT Pro M-00 offers: Cast aluminum-zinc alloy enclosure doubles as a heatsink for the built-in discrete Class AB amplifier, and both RCA and XLR/TRS inputs are provided with a near-field/far-field voicing switch. Watch for: Amir identified a critical flaw: a sudden suck-out in the upper bass frequencies that affects many commonly-used notes. Treble peaks on-axis, and vertical-axis performance is particularly problematic. In-room response turns notably bright in rooms with absorptive surfaces. Comparing directly to the JBL 305P Mark II, Amir found the NHT sounded “dead and bright” while the JBL was “balanced” with “rich and warm detail,” concluding, “I would not remotely use the NHT M-00 relative to JBL 305P Mark ii. The difference in overall fidelity and pleasantness is immense.” Long discontinued; not recommended even on the used market.
What the Audioengine HD6 offers: Rated 3.7 in the SpeakerRanking database. Watch for: A bit of an accentuated treble and bass. Slight dip in the midrange.
Buy the NHT Pro M-00 if the price matters more than sound quality. Buy the Audioengine HD6 if sound quality matters more than the price.
If sound quality matters at all to you, skip the NHT Pro M-00. It ranks near the bottom of the 64 powered bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| NHT Pro M-00 | Audioengine HD6 | |
|---|---|---|
| Price | $498 pair, discontinued (used market; originally $249 each) | $817.44 |
| Ranked | #64 of 64 in Medium Size Powered Bookshelf Speakers | #41 of 64 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 |
| Output 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 | No |
| DSP | No | - |
| Bass Extension (-3dB) | 83.3Hz (measured, Audio Science Review) | - |
| Bass Extension (-10dB) | 59.7Hz (measured, Audio Science Review) | - |
| Frequency Response | - | 45Hz-40KHz (-3dB) (Manufacturer specified) |
| Outputs | - | RCA Output |
| EQ | - | No |
Related Speaker Comparisons
More useful head-to-heads from the same speaker class:
- Dynaudio LYD 5 vs Edifier R2000DB
- Airpulse A100 vs Edifier R2000DB
- Edifier S1000W vs Klipsch The Fives
- Vanatoo Transparent Zero Plus vs Audioengine HD6
- Edifier S1000MKII vs Audioengine HD6
Prices on this page were last checked August 25, 2026 at 6:19 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
NHT Pro M-00: $498 pair, discontinued (used market; originally $249 each) eBay
Pros: Cast aluminum-zinc alloy enclosure doubles as a heatsink for the built-in discrete Class AB amplifier, and both RCA and XLR/TRS inputs are provided with a near-field/far-field voicing switch.
Cons: Amir identified a critical flaw: a sudden suck-out in the upper bass frequencies that affects many commonly-used notes. Treble peaks on-axis, and vertical-axis performance is particularly problematic. In-room response turns notably bright in rooms with absorptive surfaces. Comparing directly to the JBL 305P Mark II, Amir found the NHT sounded “dead and bright” while the JBL was “balanced” with “rich and warm detail,” concluding, “I would not remotely use the NHT M-00 relative to JBL 305P Mark ii. The difference in overall fidelity and pleasantness is immense.” Long discontinued; not recommended even on the used market.
Full NHT Pro M-00 review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 59.7Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 83.3Hz (measured, Audio Science Review) |
| Bluetooth | 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 |
| Inputs | RCA, XLR/TRS |
| Output Power | 75W RMS continuous, 150W peak (per speaker) |
| Weight | 14 lbs / 6.35 kg each |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Audioengine HD6: $817.44 Amazon eBay
Cons: A bit of an accentuated treble and bass. Slight dip in the midrange.
Full Audioengine HD6 review and specifications →
| App | No |
|---|---|
| Bluetooth | 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) |
| Inputs | Bluetooth, Aux, RCA Input, Digital Optical |
| Output Power | 50w RMS Per Speaker |
| Outputs | RCA Output |
| Weight | 17.4 lbs / 7.9 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Audioengine HD6 vs Klipsch The Fives
- Audioengine HD6 vs Edifier R2000DB
- Audioengine HD6 vs Presonus Eris E5
- Audioengine HD6 vs Pioneer DJ VM-50
- Audioengine HD6 vs Audioengine A5+ Classic
- Audioengine HD6 vs Dynaudio LYD 5
- Audioengine HD6 vs Edifier S1000W
- Audioengine HD6 vs Edifier R1280T
- See all 38 comparisons