Short answer: the Polk Audio XT15. It ranks #26 of 63 bookshelf speakers by sound quality at $179; the Neumi Silk 4 ranks #27 and costs $199.99, so there is not much of a tradeoff to weigh.
What the Polk Audio XT15 gets right: Very low $179/pair entry price for a Hi-Res Audio Certified 2-way design that’s Dolby Atmos and DTS:X compatible, and works with either 4- or 8-ohm amplifier outputs so it drops into almost any AVR without matching concerns. Watch for: Bass rolls off earlier than most of this batch at 77.6Hz (-3dB) / 54.2Hz (-10dB).
On the Neumi Silk 4 side: A 4” midwoofer paired with a 1” dome tweeter and waveguide, with a second-order crossover, achieving an impressively high preference score of 4.4 for the price. Set against that: Very low sensitivity (measured 82.6dB), meaning it isn’t suited for large rooms, far-field listening, or high volume.
Buy the Polk Audio XT15. It ranks higher for sound quality than the Neumi Silk 4 and costs less, so there is no real case for the other one.
Specifications Side By Side
| Polk Audio XT15 | Neumi Silk 4 | |
|---|---|---|
| Price | $179 | $199.99 |
| Ranked | #26 of 63 in Medium Size Bookshelf Speakers | #27 of 63 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 54.2Hz (measured, spinorama.org) | 55Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 77.6Hz (measured, spinorama.org) | 83Hz (measured, Erin’s Audio Corner) |
| Dimensions | 16.51 x 18.24cm (6.5 x 7.18 in), 4.08kg (9 lb) each | 8.9"H x 5.5"W x 8.2"D (226.1 x 139.7 x 208.3 mm) |
| Impedance | 4/8-ohm compatible | 6 ohms nominal, 5.7 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 86dB (1W/1m) | 82.6dB (measured, Erin’s Audio Corner) |
| Drivers | 1" Terylene dome tweeter, 5.25" bi-laminate paper woofer | 4" treated paper cone, rubber surround, cast aluminum basket, vented pole woofer, 1" silk dome, dispersion-optimized waveguide, neodymium magnet tweeter |
| Weight | 9 lbs / 4.08 kg (9 lb) each | 6.2 lbs / 2.8 kg each |
| Woofer Cabinet | Ported | ported, rear |
Related Speaker Comparisons
More useful head-to-heads from the same speaker class:
- Wharfedale Diamond 220 vs Sony SS-CS5 M2
- Wharfedale Diamond 220 vs Boston Acoustics A25
- Wharfedale Diamond 220 vs Paradigm Monitor SE Atom
- Emotiva B1+ vs Neumi Silk 4
- Polk Audio XT15 vs Sony SS-CS5 M2
The Two Speakers In Full
Polk Audio XT15: $179 Amazon Bhphotovideo Crutchfield
Pros: Very low $179/pair entry price for a Hi-Res Audio Certified 2-way design that’s Dolby Atmos and DTS:X compatible, and works with either 4- or 8-ohm amplifier outputs so it drops into almost any AVR without matching concerns. Directivity spread is reasonably even for the price (directivity_spdi_stddev 3.60).
Cons: Bass rolls off earlier than most of this batch at 77.6Hz (-3dB) / 54.2Hz (-10dB). On-axis deviation is the roughest measured figure here (aad_on_axis 0.449), and listening-window smoothness (0.303) trails the pricier options in this group. Modest 86dB sensitivity wants a reasonably powered amp channel. The 5.25” bi-laminate paper woofer is Polk’s entry-tier driver, not the polypropylene/Turbine cones used in its pricier Signature Elite/Reserve lines.
Full Polk Audio XT15 review and specifications →
| Bass Extension (-10dB) | 54.2Hz (measured, spinorama.org) |
|---|---|
| Bass Extension (-3dB) | 77.6Hz (measured, spinorama.org) |
| Dimensions | 16.51 x 18.24cm (6.5 x 7.18 in), 4.08kg (9 lb) each |
| Drivers | 1" Terylene dome tweeter, 5.25" bi-laminate paper woofer |
| Impedance | 4/8-ohm compatible |
| Sensitivity | 86dB (1W/1m) |
| Weight | 9 lbs / 4.08 kg (9 lb) each |
| Woofer Cabinet | Ported |
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- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Polk Audio XT15 vs Wharfedale Diamond 220
- Polk Audio XT15 vs KEF Q150
- Polk Audio XT15 vs JBL Studio 530
- Polk Audio XT15 vs ELAC Debut 2.0 B5.2
- Polk Audio XT15 vs Sony SS-CS5 M2
- Polk Audio XT15 vs Wharfedale Diamond 12.1
- Polk Audio XT15 vs Paradigm Monitor SE Atom
- Polk Audio XT15 vs Wharfedale Super Denton
- See all 15 comparisons
Neumi Silk 4: $199.99 Amazon
Pros: A 4” midwoofer paired with a 1” dome tweeter and waveguide, with a second-order crossover, achieving an impressively high preference score of 4.4 for the price. Distortion stays below 1% up to about 120Hz and below 3% above roughly 50-60Hz at 86dB. High-frequency compression is surprisingly good - better than some speakers costing 2-3x as much - and at 96dB/1m for a pair, output still reaches about 93dB at 3 meters, plenty loud for most listeners. F3 of 83Hz and F10 of 55Hz with in-room extension to about 70Hz. Takes very well to EQ correction, and the reviewer provides a specific fix (a notch around 650Hz, Q of about 6) that cleans up its main resonance.
Cons: Very low sensitivity (measured 82.6dB), meaning it isn’t suited for large rooms, far-field listening, or high volume. A resonance around 650Hz (likely port- or cabinet-related) creates an audible 1-2dB midrange thickness/boxiness on certain tracks, tied to a probable baffle-step compensation shortfall - about 1dB more energy in the midrange from the factory would likely have resolved it. Multitone distortion becomes audible around the same 600Hz-1kHz region at 96dB. Horizontal radiation narrows to about ±50° with the waveguide, on the narrower side of what the reviewer prefers. A diffraction-related dip around 5kHz at 5° below the tweeter axis creates a small hole in the response if placed on a desk below ear level. Nominal impedance of about 6 ohms with a low sensitivity means it benefits from a subwoofer pairing (the reviewer suggests an 80Hz crossover) for a complete small-room or surround setup.
Full Neumi Silk 4 review and specifications →
| Bass Extension (-10dB) | 55Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 83Hz (measured, Erin's Audio Corner) |
| Dimensions | 8.9"H x 5.5"W x 8.2"D (226.1 x 139.7 x 208.3 mm) |
| Drivers | 4" treated paper cone, rubber surround, cast aluminum basket, vented pole woofer, 1" silk dome, dispersion-optimized waveguide, neodymium magnet tweeter |
| Impedance | 6 ohms nominal, 5.7 ohms minimum (measured, Erin's Audio Corner) |
| Sensitivity | 82.6dB (measured, Erin's Audio Corner) |
| Weight | 6.2 lbs / 2.8 kg each |
| Woofer Cabinet | ported, rear |
As an eBay Partner, we may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons