Short answer: the Polk Signature Elite ES20. It ranks #71 of 134 bookshelf speakers by sound quality, rated 3.7/5, at $399. The Parts Express Samba MT ranks #85, rated 3.6/5, at $329.96, $69.04 cheaper, which does not close the gap in sound quality.
What the Polk Signature Elite ES20 does well: A full-size, efficient 6.5-inch bookshelf pair with unusually deep bass for the price. Watch for: Predicted in-room smoothness of 0.238 and directivity-index consistency of 3.81 are average rather than class-leading.
The case for the Parts Express Samba MT: A Dayton Audio designed two-way kit built around the RS180P-4 7-inch Reference paper woofer and the RST28F-4 fabric-dome tweeter, with CNC-cut MDF knock-down panels, the crossover parts and damping included. The tradeoff: The listening window spans 6.0dB between 300Hz and 5kHz in Erin’s Audio Corner’s measurements, less even than the best speakers here, and the preference score only reaches 6.27 with an ideal subwoofer.
Buy the Polk Signature Elite ES20. It is rated higher for sound quality, and the $69.04 you would save on the Parts Express Samba MT does not close the gap.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| Polk Signature Elite ES20 | Parts Express Samba MT | |
|---|---|---|
| Price | $399 per pair | $329.96 per pair |
| Ranked | #71 of 134 in Large Size Bookshelf Speakers | #85 of 134 in Large Size Bookshelf Speakers |
| Enclosure | 2-way, Power Port bass-reflex | - |
| Drivers | 1” Terylene dome tweeter, 6.5” polypropylene woofer | Dayton Audio RS180P-4 7” paper woofer, RST28F-4 1-1/8” fabric dome tweeter |
| Dimensions | 14.8H x 8.5W x 13.8D in | 15”H x 8.5”W x 11.7”D (381 x 216 x 298 mm) |
| Weight | 17 lbs (7.7 kg) each | - |
| Sensitivity | 86dB | 87dB 1W/1m (manufacturer specified) |
| Impedance | 4/8-ohm compatible | 4 ohms nominal (manufacturer specified) |
| Country | United States (design) | - |
| Spinorama Preference Score | 4.49 | 4.46 |
| Spinorama Preference Score with Perfect Sub | 6.44 | 6.27 |
| Bass Extension (-3dB) | 55.7Hz (measured, ASR via spinorama.org) | 45.4Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 38.6Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) | 33.7Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No | Yes |
| Frequency Response | - | 40Hz-20kHz (manufacturer specified) |
| Power Handling | - | 70W RMS, 140W max (manufacturer specified) |
| Woofer Cabinet | - | ported |
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Prices on this page were last checked September 30, 2026 at 2:57 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
Polk Signature Elite ES20: $399 per pair B&H Photo Video eBay
Pros: A full-size, efficient 6.5-inch bookshelf pair with unusually deep bass for the price. ASR measured 41Hz estimated in-room extension, a well-damped Q of 0.66, broad horizontal coverage to roughly +/-60 degrees and a 6.44 preference score with a subwoofer. Measured bass extension of 55.7Hz (-3dB).
Cons: Predicted in-room smoothness of 0.238 and directivity-index consistency of 3.81 are average rather than class-leading. The deep cabinet needs substantial shelf or stand space, and its Power Port still requires rear clearance.
Full Polk Signature Elite ES20 review and specifications →
| Bass Extension (-10dB) | 38.6Hz (derived, log-interpolated between spinorama.org -9dB/-12dB points) |
|---|---|
| Bass Extension (-3dB) | 55.7Hz (measured, ASR via spinorama.org) |
| Country | United States (design) |
| DIY Kit | No |
| Dimensions | 14.8H x 8.5W x 13.8D in |
| Drivers | 1” Terylene dome tweeter, 6.5” polypropylene woofer |
| Enclosure | 2-way, Power Port bass-reflex |
| Impedance | 4/8-ohm compatible |
| Sensitivity | 86dB |
| Spinorama Preference Score | 4.49 |
| Spinorama Preference Score with Perfect Sub | 6.44 |
| Weight | 17 lbs (7.7 kg) each |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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- Polk Signature Elite ES20 vs Dynaudio Contour 20i
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Parts Express Samba MT: $329.96 per pair Parts Express eBay
Pros: A Dayton Audio designed two-way kit built around the RS180P-4 7-inch Reference paper woofer and the RST28F-4 fabric-dome tweeter, with CNC-cut MDF knock-down panels, the crossover parts and damping included. Erin’s Audio Corner measured deep bass for a bookshelf, about 45Hz at -3dB and 34Hz at -10dB, a smooth predicted in-room response (0.69 smoothness) and wide horizontal dispersion averaging 60 degrees, for a preference score of 4.46. Measured bass extension of 45.4Hz (-3dB).
Cons: The listening window spans 6.0dB between 300Hz and 5kHz in Erin’s Audio Corner’s measurements, less even than the best speakers here, and the preference score only reaches 6.27 with an ideal subwoofer. It is a kit: you assemble the cabinet, solder the crossover and finish the raw MDF yourself, and each kit builds a single speaker.
Full Parts Express Samba MT review and specifications →
| Bass Extension (-10dB) | 33.7Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 45.4Hz (measured, Erin’s Audio Corner) |
| DIY Kit | Yes |
| Dimensions | 15”H x 8.5”W x 11.7”D (381 x 216 x 298 mm) |
| Drivers | Dayton Audio RS180P-4 7” paper woofer, RST28F-4 1-1/8” fabric dome tweeter |
| Frequency Response | 40Hz-20kHz (manufacturer specified) |
| Impedance | 4 ohms nominal (manufacturer specified) |
| Power Handling | 70W RMS, 140W max (manufacturer specified) |
| Sensitivity | 87dB 1W/1m (manufacturer specified) |
| Spinorama Preference Score | 4.46 |
| Spinorama Preference Score with Perfect Sub | 6.27 |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons