Short answer: the Focal Alpha 50 EVO for better sound quality, the JBL One Series 104 for the lower price. The Focal Alpha 50 EVO ranks #34 of 60 powered bookshelf speakers at $308. The JBL One Series 104 ranks #58 at $129, $179 cheaper.
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 JBL One Series 104 offers: Heavy internal EQ from the amplifier meaningfully compensates for otherwise poor raw driver measurements, and casual listening on undemanding content sounded like a scaled-down JBL 305P Mark II - well above typical computer-speaker quality for the price. Solid build quality for a $90-130 powered pair with dual built-in amplifiers. Watch for: Measuring the passive drivers alone (bypassing the amplifier’s EQ) showed “no bass, no low mids, and highly irregular highs” - a disaster by the reviewer’s description. Even with the amplifier’s correction applied, there’s an on-axis cancellation around 7.4kHz from the coaxial driver design, and JBL’s own published frequency-response graph uses a compressed 95dB vertical scale that hides real deviations the reviewer’s 50dB-scale CEA-2034 measurement reveals. Female vocals and “lisping” content became bright and annoying; the reviewer’s verdict was “can’t recommend it though if you want a true hi-fi experience.”
Buy the Focal Alpha 50 EVO if sound quality matters more than the price. Buy the JBL One Series 104 if the price matters more than sound quality.
If sound quality matters at all to you, skip the JBL One Series 104. 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 | JBL One Series 104 | |
|---|---|---|
| Price | $308.00 | $129 |
| Ranked | #34 of 60 in Medium Size Powered Bookshelf Speakers | #58 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) | 9.7H x 6W x 4.9D in (per manufacturer, 104-BT) |
| Frequency Response | 45 Hz - 22 kHz (+-3 dB) (Manufacturer specified) | 60Hz - 20kHz (Manufacturer specified) |
| Inputs | XLR, TRS, RCA | - |
| Weight | 13.2 lbs / 6.0 kg each | 4.5 lbs / 2.06 kg (master), 3.8 lbs / 1.73 kg (slave) |
| Drivers | 5" (127mm) woofer | 4.5" coaxial low-frequency driver, 0.75" soft dome tweeter |
| App | No | No |
| Bluetooth | No | - |
| EQ | Yes (Room adjustment) | Yes (fixed, amplifier-applied) |
| Output Power | 60w Per Speaker | 60W total Class D (30W per speaker) |
| Bass Extension (-3dB) | - | 45Hz with the amplifier’s DSP bass boost active (measured, Audio Science Review) |
| Bass Extension (-10dB) | - | 35Hz with the amplifier’s DSP bass boost active (measured, Audio Science Review) |
| DSP | - | Yes |
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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)
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- Reddit Search for Focal Alpha 50 EVO Review
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JBL One Series 104: $129 Amazon eBay
Pros: Heavy internal EQ from the amplifier meaningfully compensates for otherwise poor raw driver measurements, and casual listening on undemanding content sounded like a scaled-down JBL 305P Mark II - well above typical computer-speaker quality for the price. Solid build quality for a $90-130 powered pair with dual built-in amplifiers.
Cons: Measuring the passive drivers alone (bypassing the amplifier’s EQ) showed “no bass, no low mids, and highly irregular highs” - a disaster by the reviewer’s description. Even with the amplifier’s correction applied, there’s an on-axis cancellation around 7.4kHz from the coaxial driver design, and JBL’s own published frequency-response graph uses a compressed 95dB vertical scale that hides real deviations the reviewer’s 50dB-scale CEA-2034 measurement reveals. Female vocals and “lisping” content became bright and annoying; the reviewer’s verdict was “can’t recommend it though if you want a true hi-fi experience.”
Full JBL One Series 104 review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 35Hz with the amplifier's DSP bass boost active (measured, Audio Science Review) |
| Bass Extension (-3dB) | 45Hz with the amplifier's DSP bass boost active (measured, Audio Science Review) |
| DSP | Yes |
| Dimensions | 9.7H x 6W x 4.9D in (per manufacturer, 104-BT) |
| Drivers | 4.5" coaxial low-frequency driver, 0.75" soft dome tweeter |
| EQ | Yes (fixed, amplifier-applied) |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) |
| Output Power | 60W total Class D (30W per speaker) |
| Weight | 4.5 lbs / 2.06 kg (master), 3.8 lbs / 1.73 kg (slave) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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