Short answer: the Micca RB42, though neither ranks well in its class. It ranks #75 of 90 bookshelf speakers by sound quality, rated 2.3/5, at $159.99. The Polk T15 ranks #81, rated 1.9/5, at $149, $10.99 cheaper, which does not close the gap in sound quality. Both are rated below 3.0/5 among the 90 bookshelf speakers, and the Neumi BS5, ranked #22 at $139.99, is a better place to start if sound quality matters.
Buy the Micca RB42. It is rated higher for sound quality, and the $10.99 saving on the Polk T15 is not enough to make up the difference.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| Micca RB42 | Polk T15 | |
|---|---|---|
| Price | $159.99 per pair | $149.00 per pair |
| Ranked | #75 of 90 in Medium Size Bookshelf Speakers | #81 of 90 in Medium Size Bookshelf Speakers |
| Bass Extension (-3dB) | 85Hz (measured, Audio Science Review) - the reviewer noted an artificial boost around 100-300Hz, so true extension may be worse than this on-axis reading suggests | 88.6Hz (measured, Audio Science Review) |
| Bass Extension (-10dB) | 62Hz (measured, Audio Science Review) - the reviewer noted an artificial boost around 100-300Hz, so true extension may be worse than this on-axis reading suggests | 58.1Hz (measured, Audio Science Review) |
| Drivers | 4” coated paper woofer, 0.75” silk dome tweeter | 0.75” tweeter, 5.25” woofer |
| Dimensions | 8.7H x 4.9W x 7.9D in | 10.63H x 6.5W x 7.25D in |
| Weight | 6 lbs (2.7 kg) each (per retailer listing) | 8.2 lbs (3.74 kg) each |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified, typical in-room) | 60Hz - 24kHz (Manufacturer specified) |
| Sensitivity | 80dB (2.83V/1m, measured, Audio Science Review) | 89dB (manufacturer specified, 1W/1m); 88.98dB measured, spinorama.org |
| Impedance | 4-8 ohms | 8 ohms nominal |
| Power Handling | 15-100W each | - |
| Woofer Cabinet | ported, front | - |
| Spinorama Preference Score | 4.59 | 0.34 |
| Spinorama Preference Score with Perfect Sub | 6.87 | 3.39 |
| DIY Kit | No | No |
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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
Micca RB42: $159.99 per pair Amazon eBay
Pros: Curved cabinet fit and finish look closer to a speaker costing three times as much. Rated for a wide 15-100W amplifier range with 4-8 ohm compatibility, giving flexibility with modest amplification. Measured bass extension of 85Hz (-3dB), with a measured sensitivity of 80dB.
Cons: CEA2034 spinorama shows significant peaks and valleys in the on-axis and listening-window response starting a few kHz up, with excess high-frequency energy the reviewer found fatiguing over time despite an initial impression of “detail.” Off-axis response diverges heavily from on-axis, meaning tonality shifts with room and listening position in ways EQ can’t correct. Distorts and the woofer visibly flaps under moderate volume; low 83dB sensitivity makes it a harder amplifier load than its size suggests.
Full Micca RB42 review and specifications →
| Bass Extension (-10dB) | 62Hz (measured, Audio Science Review) - the reviewer noted an artificial boost around 100-300Hz, so true extension may be worse than this on-axis reading suggests |
|---|---|
| Bass Extension (-3dB) | 85Hz (measured, Audio Science Review) - the reviewer noted an artificial boost around 100-300Hz, so true extension may be worse than this on-axis reading suggests |
| DIY Kit | No |
| Dimensions | 8.7H x 4.9W x 7.9D in |
| Drivers | 4” coated paper woofer, 0.75” silk dome tweeter |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified, typical in-room) |
| Impedance | 4-8 ohms |
| Power Handling | 15-100W each |
| Sensitivity | 80dB (2.83V/1m, measured, Audio Science Review) |
| Spinorama Preference Score | 4.59 |
| Spinorama Preference Score with Perfect Sub | 6.87 |
| Weight | 6 lbs (2.7 kg) each (per retailer listing) |
| Woofer Cabinet | ported, front |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Polk T15: $149.00 per pair Amazon eBay
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