Short answer: the IK Multimedia iLoud Micro Monitor. It ranks #6 of 48 powered bookshelf speakers by sound quality, rated 4.3/5, at $299.99; the Audioengine HD3 ranks #29, rated 3.2/5, and costs $359, so there is little reason to consider the other one.
What the IK Multimedia iLoud Micro Monitor gets right: Much deeper bass than any other speaker this size. Set against that: Slightly boosted bass.
Buy the IK Multimedia iLoud Micro Monitor. It is rated higher for sound quality than the Audioengine HD3 and costs less, so only choose the other one for a particular feature it does better.
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Specifications Side By Side
| Audioengine HD3 | IK Multimedia iLoud Micro Monitor | |
|---|---|---|
| Price | $359.00 per pair | $299.99 per pair |
| Ranked | #29 of 48 in Small Size Powered Bookshelf Speakers | #6 of 48 in Small Size Powered Bookshelf Speakers |
| Dimensions | 9”H x 5.5”W x 6.5”D (228.6 x 139.7 x 165.1 mm) | 7.1”H x 3.5”W x 5.3”D (180.3 x 88.9 x 134.6 mm) |
| Frequency Response | 65 Hz-20 kHz (-3dB) (Manufacturer specified) | 55Hz - 20kHz (-3dB) (Manufacturer specified) |
| Inputs | Bluetooth, Aux, RCA Input | RCA, Aux |
| Outputs | RCA variable output (subwoofer) | - |
| Weight | 7.3 lbs (3.3 kg) | 2 lbs (0.9 kg) |
| Drivers | 2.75” woofer, 0.75” silk dome tweeter | 3” woofer, 0.75” silk dome tweeter |
| App | No | No |
| Bass Extension (-10dB) | 58Hz | 45Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 65Hz | 55Hz (measured, Audio Science Review) |
| Bluetooth | Yes | Yes (A2DP) |
| Bluetooth Codecs | SBC, aptX | - |
| Bluetooth Version | 5.0 | - |
| EQ | No | Yes (Bass/Treble switches, Desktop/Free field) |
| Amplifier Power | 30W total (15W per speaker) | 50W total (combined) |
| Maximum SPL | 90dB @ 1m (manufacturer specified) | 96dB @ 1m (manufacturer specified) |
| Subwoofer Output | Yes | - |
| XLR Input | No | No |
| RCA Input | Yes | Yes |
| TRS Input | No | No |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | Yes | Yes |
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