Short answer: the Adam Audio S2V for driver integration; the JBL 306P MKII for a smooth compact monitor. The Adam blends its 7-inch woofer and AMT tweeter through an imperceptible crossover with distortion 70dB down at 1kHz, though a shelving curve dips the low bass around 200-500Hz. The JBL is smooth and well controlled for a 6.5-inch monitor, with a narrow dip around 1.6kHz.
What the JBL 306P MKII offers: CEA2034 spinorama shows a nice, smooth on-axis response with very good directivity control for a compact 6.5” monitor. Watch for: A narrow but noticeable dip around 1.6kHz shows up in the on-axis and listening-window curves.
Buy the JBL 306P MKII when the price outweighs sound quality for you, and the Adam Audio S2V when sound quality outweighs the price instead.
Looking for alternatives? See the complete Powered Home rankings.
Specifications Side By Side
| JBL 306P MKII | Adam Audio S2V | |
|---|---|---|
| Price | $398 per pair | $3,399.98 per pair |
| Ranked | #41 of 68 in Large Size Powered Bookshelf Speakers | #13 of 68 in Large Size Powered Bookshelf Speakers |
| Bass Extension (-3dB) | 46.9Hz (measured, Audio Science Review) | 52.7Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 38.6Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) | 41.2Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Dimensions | 16.1”H x 11.2”W x 12.9”D (408 x 285 x 328 mm) | 13.6” x 8.7” x 13.3” (346 x 222 x 338 mm) (H x W x D) |
| Frequency Response | 39Hz - 24kHz (-10dB) (Manufacturer specified) | 35Hz - 50kHz (Manufacturer specified) |
| Weight | 13.4 lbs (6.1 kg) each | 24.3 lbs (11.0 kg) |
| Drivers | 6.5” woofer, 1” neodymium tweeter | 7” woofer, S-ART AMT tweeter |
| App | No | Yes |
| EQ | No | No |
| DSP | No | Yes |
| Amplifier Power | 112W total | 350W total (300W woofer Class D, 50W tweeter Class A/B) |
| Spinorama Preference Score | 5.06 | 5.84 |
| Spinorama Preference Score with Perfect Sub | 6.94 | 7.98 |
| Inputs | XLR, 1/4” TRS | XLR, AES/EBU |
| XLR Input | Yes | Yes |
| RCA Input | No | No |
| TRS Input | Yes | No |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | Yes |
| Aux Input | No | No |
| Bluetooth | No | No |
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- JBL 308P MKII vs Adam Audio S2V
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Prices on this page were last checked October 2, 2026 at 10:18 PM 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
JBL 306P MKII: $398 per pair B&H Photo Video eBay
Pros: A 6.94 ideal-subwoofer score and 46.9Hz measured -3dB extension make this a useful affordable nearfield monitor. The waveguide supports broad horizontal listening coverage, and basic boundary controls help with setup. Measured bass extension of 46.9Hz (-3dB).
Cons: The 3.4dB response span from 300Hz to 5kHz is less even than the 308P MKII’s, with midrange resonances affecting neutrality. Hiss can matter at a quiet desk, while bass distortion limits demanding playback. A subwoofer improves bandwidth but does not remove the midrange irregularities. A narrow dip around 1.6kHz shows in the on-axis and listening-window curves.
Full JBL 306P MKII review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 112W total |
| App | No |
| Aux Input | No |
| Bass Extension (-10dB) | 38.6Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 46.9Hz (measured, Audio Science Review) |
| Bluetooth | No |
| Coaxial Input | No |
| DSP | No |
| Dimensions | 16.1”H x 11.2”W x 12.9”D (408 x 285 x 328 mm) |
| Drivers | 6.5” woofer, 1” neodymium tweeter |
| EQ | No |
| Frequency Response | 39Hz - 24kHz (-10dB) (Manufacturer specified) |
| HDMI Input | No |
| Inputs | XLR, 1/4” TRS |
| Optical Input | No |
| RCA Input | No |
| Spinorama Preference Score | 5.06 |
| Spinorama Preference Score with Perfect Sub | 6.94 |
| TRS Input | Yes |
| USB Input | No |
| Weight | 13.4 lbs (6.1 kg) each |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Adam Audio S2V: $3,399.98 per pair Amazon eBay
Pros: A 7.98 ideal-subwoofer score and relatively even listening-window response support a strong role as a subwoofer-assisted studio monitor. The review’s low-distortion findings add useful evidence beyond amplifier ratings, and onboard DSP permits tailored adjustment. The review measured distortion about 70dB below the signal at 1kHz. Measured bass extension of 52.7Hz (-3dB).
Cons: Measured -3dB extension is 52.7Hz, so the large cabinet does not automatically deliver the deepest bass here. The native balance rises toward the treble, with some lower-midrange unevenness. DSP can improve that balance, but an EQ-optimized result is not its unadjusted performance.
Full Adam Audio S2V review and specifications →
| AES Input | Yes |
|---|---|
| Amplifier Power | 350W total (300W woofer Class D, 50W tweeter Class A/B) |
| App | Yes |
| Aux Input | No |
| Bass Extension (-10dB) | 41.2Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
| Bass Extension (-3dB) | 52.7Hz (measured, Audio Science Review) |
| Bluetooth | No |
| Coaxial Input | No |
| DSP | Yes |
| Dimensions | 13.6” x 8.7” x 13.3” (346 x 222 x 338 mm) (H x W x D) |
| Drivers | 7” woofer, S-ART AMT tweeter |
| EQ | No |
| Frequency Response | 35Hz - 50kHz (Manufacturer specified) |
| HDMI Input | No |
| Inputs | XLR, AES/EBU |
| Optical Input | No |
| RCA Input | No |
| Spinorama Preference Score | 5.84 |
| Spinorama Preference Score with Perfect Sub | 7.98 |
| TRS Input | No |
| USB Input | No |
| Weight | 24.3 lbs (11.0 kg) |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons