Short answer: the JBL 4305P. It ranks #16 of 61 powered bookshelf speakers by sound quality at $2200; the Adam Audio S2V ranks #43 and costs $3500, so there is not much of a tradeoff to weigh.
What the JBL 4305P offers: Erin measured a 45Hz F3 and heard solid 40–50Hz in-room extension—excellent for a compact 5.25-inch active monitor. Tonality is neutral and non-fatiguing, vocal coloration is absent, imaging is precise, and the HDI horn maintains near-constant horizontal directivity above 2kHz. Each speaker is bi-amplified (125W LF + 25W HF), while USB, optical, balanced analog, AirPlay 2, Chromecast, Bluetooth and 24/192 wired interconnect make this an unusually complete system. Grilles caused no meaningful response penalty. Watch for: The limiter becomes conspicuous around 96dB: Erin measured about 8dB lost near 50Hz at the highest drive and achieved roughly 93dB unweighted at 2m in-room, so this is a near/midfield system rather than a high-output theater speaker. A baffle discontinuity produces a 1–2kHz directivity mismatch that cannot be corrected uniformly in the vertical plane; stay within about +/-5° of tweeter height. Soundstage depth and layering trailed the KEF Reference 1 Meta, and wireless speaker linking caps resolution at 24/96.
What the Adam Audio S2V offers: CEA2034 spinorama shows excellent driver blending through an imperceptible crossover between the 7” woofer and AMT tweeter, with distortion measured 70dB down at 1kHz. The 350W amplifier was the first the reviewer tested that didn’t run out of power on demand, delivering over 120dB SPL per pair. Watch for: An intentional shelving curve creates a dip in the low bass response, roughly 200-500Hz. The rotary-encoder control interface is non-intuitive, and the companion PC app requires serial-number registration with settings that only take effect after a manual “write” step that takes 5-10 seconds and produces audible ticks and pops. Expensive at $3,500 per pair.
Buy the JBL 4305P. It ranks higher for sound quality than the Adam Audio S2V and costs less, so there is no real case for the other one.
Specifications Side By Side
| JBL 4305P | Adam Audio S2V | |
|---|---|---|
| Price | $2,200/pair | $3500 |
| Ranked | #16 of 61 in Large Size Powered Bookshelf Speakers | #43 of 61 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 45Hz (measured, Erin’s Audio Corner) | 85Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 40.5Hz (measured, Erin’s Audio Corner) | 62Hz (measured, Audio Science Review) |
| Sensitivity | Not applicable (active DSP loudspeaker) | - |
| Maximum Output | ~93dB at 2m in-room before limiting (measured, Erin’s Audio Corner) | - |
| Amplification | 300W system: 125W LF + 25W HF per speaker | - |
| Drivers | 5.25-inch pulp woofer; 1-inch annular compression driver | 7" woofer, S-ART AMT tweeter |
| Dimensions | 13.2H x 8.3W x 8.8D inches | not published by manufacturer |
| Frequency Response | - | 35Hz - 50kHz (Manufacturer specified) |
| Weight | - | not published by manufacturer |
| App | - | Yes |
| EQ | - | No |
| DSP | - | Yes |
| Output Power | - | 350W total (300W woofer Class D, 50W tweeter Class A/B) |
Related Speaker Comparisons
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- Yamaha HS8 vs Genelec S360
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- Neumann KH 310 A vs Yamaha HS8
- Focal Twin6 Be vs Adam Audio S2V
- Neumann KH 150 vs JBL 4305P
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The Two Speakers In Full
JBL 4305P: $2,200/pair Amazon JBL eBay
Pros: Erin measured a 45Hz F3 and heard solid 40–50Hz in-room extension—excellent for a compact 5.25-inch active monitor. Tonality is neutral and non-fatiguing, vocal coloration is absent, imaging is precise, and the HDI horn maintains near-constant horizontal directivity above 2kHz. Each speaker is bi-amplified (125W LF + 25W HF), while USB, optical, balanced analog, AirPlay 2, Chromecast, Bluetooth and 24/192 wired interconnect make this an unusually complete system. Grilles caused no meaningful response penalty.
Cons: The limiter becomes conspicuous around 96dB: Erin measured about 8dB lost near 50Hz at the highest drive and achieved roughly 93dB unweighted at 2m in-room, so this is a near/midfield system rather than a high-output theater speaker. A baffle discontinuity produces a 1–2kHz directivity mismatch that cannot be corrected uniformly in the vertical plane; stay within about +/-5° of tweeter height. Soundstage depth and layering trailed the KEF Reference 1 Meta, and wireless speaker linking caps resolution at 24/96.
Full JBL 4305P review and specifications →
| Amplification | 300W system: 125W LF + 25W HF per speaker |
|---|---|
| Bass Extension (-10dB) | 40.5Hz (measured, Erin's Audio Corner) |
| Bass Extension (-3dB) | 45Hz (measured, Erin's Audio Corner) |
| Dimensions | 13.2H x 8.3W x 8.8D inches |
| Drivers | 5.25-inch pulp woofer; 1-inch annular compression driver |
| Maximum Output | ~93dB at 2m in-room before limiting (measured, Erin's Audio Corner) |
| Sensitivity | Not applicable (active DSP loudspeaker) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Adam Audio S2V: $3500 Bhphotovideo eBay
Pros: CEA2034 spinorama shows excellent driver blending through an imperceptible crossover between the 7” woofer and AMT tweeter, with distortion measured 70dB down at 1kHz. The 350W amplifier was the first the reviewer tested that didn’t run out of power on demand, delivering over 120dB SPL per pair.
Cons: An intentional shelving curve creates a dip in the low bass response, roughly 200-500Hz. The rotary-encoder control interface is non-intuitive, and the companion PC app requires serial-number registration with settings that only take effect after a manual “write” step that takes 5-10 seconds and produces audible ticks and pops. Expensive at $3,500 per pair.
Full Adam Audio S2V review and specifications →
| App | Yes |
|---|---|
| Bass Extension (-10dB) | 62Hz (measured, Audio Science Review) |
| Bass Extension (-3dB) | 85Hz (measured, Audio Science Review) |
| DSP | Yes |
| Dimensions | not published by manufacturer |
| Drivers | 7" woofer, S-ART AMT tweeter |
| EQ | No |
| Frequency Response | 35Hz - 50kHz (Manufacturer specified) |
| Output Power | 350W total (300W woofer Class D, 50W tweeter Class A/B) |
| Weight | not published by manufacturer |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons