Short answer: the Polk T15, if you are buying new. The JBL Studio 530 ranks higher than it (#80 vs #146 of 160 bookshelf speakers, 3.3/5 vs 1.9/5) but is discontinued, so only consider it used; the Polk T15 is still sold new at $112.
The JBL Studio 530 is the more accurate, deeper-bass pick. CEA2034 spinorama shows a fairly flat on-axis response. Its measured preference score, a predictor of how neutral it sounds, is 5.21 against 0.34 for the Polk T15. Its bass reaches about 73.2Hz before falling 3dB, against 88.6Hz for the Polk T15. The catch: A peak around 1.4kHz is attributed to a tweeter resonance, and shows up as a distinct spike in harmonic distortion at that frequency along with a second resonance-driven bump around 2kHz.
The case for the Polk T15: Extremely affordable 2-way design that actually measured better at +/-20 degrees vertical off-axis than directly on-axis. The tradeoff: Spinorama analysis reveals what Amir called a “horrific drop in upper mids/lower treble region of 3 to 6 kHz,” likely from tweeter-woofer phase cancellation directly on-axis.
Buy the Polk T15 if you want one new; the JBL Studio 530 is discontinued, so only look for it used.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| JBL Studio 530 | Polk T15 | |
|---|---|---|
| Price | $399 per pair Discontinued | $112.00 per pair |
| Ranked | #80 of 160 in Medium Size Bookshelf Speakers | #146 of 160 in Medium Size Bookshelf Speakers |
| Bass Extension (-3dB) | 73.2Hz (measured, Audio Science Review) | 88.6Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 40Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) | 58.1Hz (measured, Audio Science Review) |
| Crossover Frequency | 1.5kHz | - |
| Dimensions | 18.4”H x 8.4”W x 8.7”D (467 x 214 x 222 mm) | 10.63H x 6.5W x 7.25D in |
| Impedance | 6 ohms nominal (4 ohms minimum, measured by Audio Science Review) | 8 ohms nominal |
| Sensitivity | ~85dB (measured by Audio Science Review) | 89dB (manufacturer specified, 1W/1m); 88.98dB measured, spinorama.org |
| Drivers | 5.25” (130mm) PolyPlas™ cone woofer with SFG magnet, 1” (25mm) compression driver with Teonex® diaphragm on Bi-Radial® horn | 0.75” tweeter, 5.25” woofer |
| Weight | 17 lbs (7.7 kg) each | 8.2 lbs (3.74 kg) each |
| Woofer Cabinet | ported | - |
| Spinorama Preference Score | 5.21 (spinorama.org) | 0.34 |
| Spinorama Preference Score with Perfect Sub | 7.29 (spinorama.org) | 3.39 |
| DIY Kit | No | No |
| Frequency Response | - | 60Hz - 24kHz (Manufacturer specified) |
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Prices on this page were last checked October 7, 2026 at 9:25 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 Studio 530: $399 per pair Discontinued eBay
Same family: the JBL Studio 590 (floorstanding, rated 2.8/5) and the JBL Studio 520C (center, rated 3.4/5).
Pros: CEA2034 spinorama shows a fairly flat on-axis response. Predicted in-room response is very smooth aside from the high-frequency roll-off. Measured bass extension of 73.2Hz (-3dB), with a measured sensitivity of 85dB.
Cons: A peak around 1.4kHz is attributed to a tweeter resonance, and shows up as a distinct spike in harmonic distortion at that frequency along with a second resonance-driven bump around 2kHz. Response rolls off in the high frequencies and the tuning is a bit bass-shy overall. Cumulative spectral decay (waterfall) shows the same 1kHz-region resonances lingering in time. Discontinued.
Full JBL Studio 530 review and specifications →
| Bass Extension (-10dB) | 40Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
|---|---|
| Bass Extension (-3dB) | 73.2Hz (measured, Audio Science Review) |
| Crossover Frequency | 1.5kHz |
| DIY Kit | No |
| Dimensions | 18.4”H x 8.4”W x 8.7”D (467 x 214 x 222 mm) |
| Drivers | 5.25” (130mm) PolyPlas™ cone woofer with SFG magnet, 1” (25mm) compression driver with Teonex® diaphragm on Bi-Radial® horn |
| Impedance | 6 ohms nominal (4 ohms minimum, measured by Audio Science Review) |
| Sensitivity | ~85dB (measured by Audio Science Review) |
| Spinorama Preference Score | 5.21 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.29 (spinorama.org) |
| Weight | 17 lbs (7.7 kg) each |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
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Polk T15: $112.00 per pair Amazon eBay
Same family: the Polk T50 (floorstanding, rated 3.8/5).
Pros: Extremely affordable 2-way design that actually measured better at +/-20 degrees vertical off-axis than directly on-axis. In near-field desktop use, the reviewer found the T15 “didn’t sound that horrible,” partly because nearby desk reflections mask the frequency response dip. Measured bass extension of 88.6Hz (-3dB), with a measured sensitivity of 89dB.
Cons: Spinorama analysis reveals what Amir called a “horrific drop in upper mids/lower treble region of 3 to 6 kHz,” likely from tweeter-woofer phase cancellation directly on-axis. Measured impedance ranges from 4-8 ohms, contradicting the specified 6-8 ohm range, and there’s a distortion peak around 400Hz. On- and off-axis response “vary a ton,” making listening position unusually important. The reviewer recommends saving up for the Pioneer SP-BS22-LR instead: “I can’t justify recommending the Polk T15 even though subjective performance was not horrible.”
Full Polk T15 review and specifications →
| Bass Extension (-10dB) | 58.1Hz (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 88.6Hz (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 10.63H x 6.5W x 7.25D in |
| Drivers | 0.75” tweeter, 5.25” woofer |
| Frequency Response | 60Hz - 24kHz (Manufacturer specified) |
| Impedance | 8 ohms nominal |
| Sensitivity | 89dB (manufacturer specified, 1W/1m); 88.98dB measured, spinorama.org |
| Spinorama Preference Score | 0.34 |
| Spinorama Preference Score with Perfect Sub | 3.39 |
| Weight | 8.2 lbs (3.74 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons