Short answer: the Vanatoo Transparent Zero Plus. It ranks #46 of 108 powered bookshelf speakers by sound quality, rated 3.9/5, at $499.99; the ADAM Audio A4V ranks #67, rated 3.6/5, and costs $1,079.98, so there is little reason to consider the other one.
Why pick the ADAM Audio A4V: Compact monitor with onboard DSP, placement controls and room-correction integration. The tradeoff: A small average-deviation figure hides a major localized response irregularity: the selected measurement spans 10.8dB from 300Hz to 5kHz, and listening-window narrow-band deviation is 0.547.
The case for the Vanatoo Transparent Zero Plus: Erin’s data shows a small 1.7dB span from 300Hz to 5kHz and a broadly level midrange trend. It keeps a wired aux input, which the ADAM Audio A4V lacks. Watch for: The measured -3dB point is around 95Hz, with a much lower F10 in the original review; this is not flat bass to the low-50Hz region.
Buy the Vanatoo Transparent Zero Plus. It is rated higher for sound quality than the ADAM Audio A4V and costs less, which makes it the one to get unless you need something the other one does better.
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Compact monitor with onboard DSP, placement controls and room-correction integration.
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Erin’s data shows a small 1.7dB span from 300Hz to 5kHz and a broadly level midrange trend.
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Specifications Side By Side
| ADAM Audio A4V | Vanatoo Transparent Zero Plus | |
|---|---|---|
| Price | $1,079.98 per pair | $499.99 per pair |
| Ranked | #67 of 108 in Medium Size Powered Bookshelf Speakers | #46 of 108 in Medium Size Powered Bookshelf Speakers |
| Enclosure | 2-way active, dual front ports | - |
| Drivers | X-ART folded-ribbon tweeter, 4” MLM woofer | 4” aluminum cone woofer, 4” long-throw passive radiator, 1” soft dome tweeter |
| Dimensions | 10.6H x 6.2W x 8.7D in | 8.5”H x 5.5”W x 6”D |
| Weight | 12.8 lbs (5.8 kg) each | 7.1 lbs (3.2 kg) each |
| Amplifier Power | 130W RMS each | 120W total (Class D) |
| Inputs | XLR and RCA; Ethernet for control | Bluetooth (aptX HD), USB (24-bit/96kHz), Toslink Optical (24-bit/96kHz), 3.5mm Analog |
| Spinorama Preference Score | 3.92 | 4.07 |
| Spinorama Preference Score with Perfect Sub | 6.33 | 6.73 |
| XLR Input | Yes | No |
| RCA Input | Yes | No |
| TRS Input | No | No |
| Optical Input | No | Yes |
| Coaxial Input | No | No |
| USB Input | No | Yes |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | Yes |
| Bluetooth | No | Yes |
| Frequency Response | 58Hz - 41kHz (-3dB) (Manufacturer specified) | 56Hz - 20kHz (+/-3dB) (Manufacturer specified) |
| Bluetooth Codecs | - | SBC, AAC, aptX, aptX HD |
| Bass Extension (-3dB) | - | 92Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | - | 53Hz (measured, Erin’s Audio Corner) |
| Sensitivity | - | 88.5dB (measured at 0.3V/1m, Erin’s Audio Corner) |
| DSP | - | Yes (8th-order Butterworth high-pass at 58Hz) |
| Subwoofer Output | - | Yes |
| Outputs | - | RCA subwoofer |
Frequency Response Compared
Both speakers’ spinorama measurements, overlaid. A flatter line is more neutral: peaks sound forward or harsh, dips sound recessed. Each curve is shifted so its average from 300 Hz to 3 kHz sits at 0 dB, so loudness differences between the two are removed and only the shape is compared. The two were measured by different sources, so small differences, especially in the bass, can come from the measurement setup rather than the speakers.
Measurement data: ADAM Audio A4V (measured by Audio Science Review) and Vanatoo Transparent Zero Plus (measured by Erin’s Audio Corner), via spinorama.org.
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