Short answer: the Focal Alpha 50 EVO. It ranks #34 of 60 powered bookshelf speakers by sound quality at $308; the Audioengine HD4 ranks #53 and costs $429, so there is not much of a tradeoff to weigh.
What the Focal Alpha 50 EVO offers: The available response trace suggests reasonably smooth on-axis and listening-window behavior, with Spinorama narrow-band-deviation values of 0.448 and 0.366 respectively. With a subwoofer its calculated preference score is 5.05, and the rear shelving controls provide some useful room and placement adjustment. Watch for: The only Spinorama data is a low-quality graph digitization rather than a Klippel measurement, so the extreme calculated bass and sound-power results should not be taken literally. That limited dataset produces a very low 0.40 full-range preference score, weak predicted in-room smoothness, and unusually inconsistent directivity. Independent high-quality measurements are still needed.
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 Focal Alpha 50 EVO. It ranks higher for sound quality than the Audioengine HD4 and costs less, so there is no real case for the other one.
If sound quality matters at all to you, skip the Audioengine HD4. It ranks near the bottom of the 60 powered bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| Focal Alpha 50 EVO | Audioengine HD4 | |
|---|---|---|
| Price | $308.00 | $429.00 |
| Ranked | #34 of 60 in Medium Size Powered Bookshelf Speakers | #53 of 60 in Medium Size Powered Bookshelf Speakers |
| Dimensions | 12.2"H x 9"W x 9.4"D (309.9 x 228.6 x 238.8 mm) | 9"H x 5.5"W x 6.5"D (228.6 x 139.7 x 165.1 mm) |
| Frequency Response | 45 Hz - 22 kHz (+-3 dB) (Manufacturer specified) | 60 Hz-20 kHz (-3dB) (Manufacturer specified) |
| Inputs | XLR, TRS, RCA | Bluetooth, Aux, RCA Input |
| Weight | 13.2 lbs / 6.0 kg each | 7.3 lbs / 3.3 kg |
| Drivers | 5" (127mm) woofer | 4" (102mm) woofer |
| App | No | No |
| Bluetooth | No | No |
| EQ | Yes (Room adjustment) | No |
| Output Power | 60w Per Speaker | 50w RMS Per Speaker |
| Outputs | - | RCA Output |
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Prices on this page were last checked August 24, 2026 at 6:53 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
Focal Alpha 50 EVO: $308.00 Amazon eBay
Pros: The available response trace suggests reasonably smooth on-axis and listening-window behavior, with Spinorama narrow-band-deviation values of 0.448 and 0.366 respectively. With a subwoofer its calculated preference score is 5.05, and the rear shelving controls provide some useful room and placement adjustment.
Cons: The only Spinorama data is a low-quality graph digitization rather than a Klippel measurement, so the extreme calculated bass and sound-power results should not be taken literally. That limited dataset produces a very low 0.40 full-range preference score, weak predicted in-room smoothness, and unusually inconsistent directivity. Independent high-quality measurements are still needed.
Full Focal Alpha 50 EVO review and specifications →
| App | No |
|---|---|
| Bluetooth | No |
| Dimensions | 12.2"H x 9"W x 9.4"D (309.9 x 228.6 x 238.8 mm) |
| Drivers | 5" (127mm) woofer |
| EQ | Yes (Room adjustment) |
| Frequency Response | 45 Hz - 22 kHz (+-3 dB) (Manufacturer specified) |
| Inputs | XLR, TRS, RCA |
| Output Power | 60w Per Speaker |
| Weight | 13.2 lbs / 6.0 kg each |
- Links
- Reviews, Comparisons and Sound Samples
- Independent Measurements (spinorama.org; low-quality graph digitization)
- DSAUDIO.review: DSAUDIO.review Focal Alpha 50 EVO vs Adam Audio T5V sound.DEMO More from DSAUDIOreview →
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- Reddit Search for Focal Alpha 50 EVO Review
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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 |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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