Short answer: the Genelec 8030C for better sound quality, the JBL One Series 104 for the lower price. The Genelec 8030C ranks #3 of 64 powered bookshelf speakers at $1590. The JBL One Series 104 ranks #62 at $129, $1461 cheaper.
What the Genelec 8030C offers: CEA2034 spinorama shows a near-flat on-axis response with smooth directivity - “very nice overall.” Predicted in-room response is excellent aside from one minor dip. Reasonably wide horizontal beamwidth of about ±60 degrees that doesn’t narrow even above 10kHz. At 106dB SPL/1m, bass distortion measures much lower than a comparable passive speaker-plus-amplifier combination (Revel M106) tested the same way. Compression is purely instantaneous/amplitude-related rather than thermal, with max SPL before compression reaching 111dB SPL at 200Hz (96dB plus 15dB of headroom). The reviewer found it immediately musical, with reference tracks “translating” beautifully out of the box, and EQ correction of its one measured flaw improved detail with no downsides. Overall conclusion: excellent value, a rare combination of measured accuracy and genuinely engaging sound. Watch for: A minor but measurable dip between 2-3kHz shows up in both on- and off-axis measurements. Vertical directivity varies significantly with frequency, so listening height needs to stay right at the tweeter/ear axis for accurate tonal balance. Distortion at 106dB SPL/1m is elevated in the 500Hz-2kHz range compared to the Revel M106 comparison, even though bass distortion is much better. Compression headroom drops substantially at low frequencies - only about 105dB SPL max at 50Hz (a 0.5dB compression point) versus 111dB SPL at 200Hz, roughly a 6dB difference. As a near-field monitor, it has genuinely limited headroom in the deep bass - the reviewer noted severe distortion on deep-bass-heavy tracks at anything beyond modest listening levels.
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 Genelec 8030C 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 64 powered bookshelf speakers, so look higher up the list instead.
Specifications Side By Side
| Genelec 8030C | JBL One Series 104 | |
|---|---|---|
| Price | $1590 | $129 |
| Ranked | #3 of 64 in Medium Size Powered Bookshelf Speakers | #62 of 64 in Medium Size Powered Bookshelf Speakers |
| Bass Extension (-10dB) | 47Hz (measured, Audio Science Review) | 35Hz with the amplifier’s DSP bass boost active (measured, Audio Science Review) |
| Bass Extension (-3dB) | 59Hz (measured, Audio Science Review) | 45Hz with the amplifier’s DSP bass boost active (measured, Audio Science Review) |
| Dimensions | 11.7"H x 7.4"W x 7"D (297.2 x 188 x 177.8 mm) | 9.7H x 6W x 4.9D in (per manufacturer, 104-BT) |
| Inputs | XLR | - |
| Weight | 11 lbs / 5 kg each | 4.5 lbs / 2.06 kg (master), 3.8 lbs / 1.73 kg (slave) |
| Drivers | 5.1" woofer, 0.75" metal dome tweeter | 4.5" coaxial low-frequency driver, 0.75" soft dome tweeter |
| App | No | No |
| Bluetooth | No | - |
| EQ | Yes (Bass tilt, treble tilt, room response) | Yes (fixed, amplifier-applied) |
| Frequency Response | 54Hz - 20kHz (±2.5dB) (Manufacturer specified) | 60Hz - 20kHz (Manufacturer specified) |
| Max SPL | 110dB @ 1m | - |
| Output Power | 100W (50W woofer + 50W tweeter) | 60W total Class D (30W per speaker) |
| DSP | - | Yes |
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The Two Speakers In Full
Genelec 8030C: $1590 Bhphotovideo eBay
Pros: CEA2034 spinorama shows a near-flat on-axis response with smooth directivity - “very nice overall.” Predicted in-room response is excellent aside from one minor dip. Reasonably wide horizontal beamwidth of about ±60 degrees that doesn’t narrow even above 10kHz. At 106dB SPL/1m, bass distortion measures much lower than a comparable passive speaker-plus-amplifier combination (Revel M106) tested the same way. Compression is purely instantaneous/amplitude-related rather than thermal, with max SPL before compression reaching 111dB SPL at 200Hz (96dB plus 15dB of headroom). The reviewer found it immediately musical, with reference tracks “translating” beautifully out of the box, and EQ correction of its one measured flaw improved detail with no downsides. Overall conclusion: excellent value, a rare combination of measured accuracy and genuinely engaging sound.
Cons: A minor but measurable dip between 2-3kHz shows up in both on- and off-axis measurements. Vertical directivity varies significantly with frequency, so listening height needs to stay right at the tweeter/ear axis for accurate tonal balance. Distortion at 106dB SPL/1m is elevated in the 500Hz-2kHz range compared to the Revel M106 comparison, even though bass distortion is much better. Compression headroom drops substantially at low frequencies - only about 105dB SPL max at 50Hz (a 0.5dB compression point) versus 111dB SPL at 200Hz, roughly a 6dB difference. As a near-field monitor, it has genuinely limited headroom in the deep bass - the reviewer noted severe distortion on deep-bass-heavy tracks at anything beyond modest listening levels.
Full Genelec 8030C review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 47Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 59Hz (measured, Audio Science Review) |
| Bluetooth | No |
| Dimensions | 11.7"H x 7.4"W x 7"D (297.2 x 188 x 177.8 mm) |
| Drivers | 5.1" woofer, 0.75" metal dome tweeter |
| EQ | Yes (Bass tilt, treble tilt, room response) |
| Frequency Response | 54Hz - 20kHz (±2.5dB) (Manufacturer specified) |
| Inputs | XLR |
| Max SPL | 110dB @ 1m |
| Output Power | 100W (50W woofer + 50W tweeter) |
| Weight | 11 lbs / 5 kg each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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
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