Short answer: the Audioengine HD4. It ranks #54 of 64 powered bookshelf speakers by sound quality at $429; the NHT Pro M-00 ranks #64 and costs $498, so there is not much of a tradeoff to weigh.
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 HD4 offers: Rated 3.3 in the SpeakerRanking database. Watch for: Not a great sounding speaker for the high price.
Buy the Audioengine HD4. It ranks higher for sound quality than the NHT Pro M-00 and costs less, so there is no real case for the other one.
If sound quality matters at all to you, skip both of these and look higher up the 64 powered bookshelf speakers instead.
Specifications Side By Side
| NHT Pro M-00 | Audioengine HD4 | |
|---|---|---|
| Price | $498 pair, discontinued (used market; originally $249 each) | $429.00 |
| Ranked | #64 of 64 in Medium Size Powered Bookshelf Speakers | #54 of 64 in Medium Size Powered Bookshelf Speakers |
| Drivers | 1" ferrofluid-cooled fabric dome tweeter, 4.5" treated paper-cone woofer | 4" (102mm) woofer |
| Dimensions | 9H x 5.7W x 7.3D in | 9"H x 5.5"W x 6.5"D (228.6 x 139.7 x 165.1 mm) |
| Weight | 14 lbs / 6.35 kg each | 7.3 lbs / 3.3 kg |
| Output Power | 75W RMS continuous, 150W peak (per speaker) | 50w RMS Per Speaker |
| Inputs | RCA, XLR/TRS | Bluetooth, Aux, RCA Input |
| 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 | - | 60 Hz-20 kHz (-3dB) (Manufacturer specified) |
| Outputs | - | RCA Output |
| EQ | - | No |
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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.
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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 HD4: $429.00 Amazon eBay
Cons: Not a great sounding speaker for the high price.
Full Audioengine HD4 review and specifications →
| App | No |
|---|---|
| Bluetooth | No |
| Dimensions | 9"H x 5.5"W x 6.5"D (228.6 x 139.7 x 165.1 mm) |
| Drivers | 4" (102mm) woofer |
| EQ | No |
| Frequency Response | 60 Hz-20 kHz (-3dB) (Manufacturer specified) |
| Inputs | Bluetooth, Aux, RCA Input |
| Output Power | 50w RMS Per Speaker |
| Outputs | RCA Output |
| Weight | 7.3 lbs / 3.3 kg |
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