Short answer: the Polk Monitor XT20. It ranks #65 of 100 bookshelf speakers by sound quality at $279; the JBL XPL-90 ranks #71 and costs $1298, so there is not much of a tradeoff to weigh.
On the Polk Monitor XT20 side: Two-way bookshelf design with a 1” tweeter and 6.5” woofer, part of Polk’s budget-friendly XT lineup (spanning roughly $200-700 across the series). Set against that: Notably bright treble, elevated roughly 1-5dB above the midrange depending on frequency - a characteristic shared across the whole Polk XT lineup, requiring either EQ or toe-out to tame.
What the JBL XPL-90 offers: Nearly ruler-flat on-axis response up to 1kHz with even horizontal directivity until the tweeter beams above 10kHz. Watch for: Crossover region peaking around 3kHz and treble peaking above 10kHz color the top end, and poor vertical directivity means the tweeter needs to be at ear level.
Buy the Polk Monitor XT20. It ranks higher for sound quality than the JBL XPL-90 and costs less, so there is no real case for the other one.
Specifications Side By Side
| Polk Monitor XT20 | JBL XPL-90 | |
|---|---|---|
| Price | $279.00 | $1,298 used, discontinued (vintage, late 1980s) |
| Ranked | #65 of 100 in Large Size Bookshelf Speakers | #71 of 100 in Large Size Bookshelf Speakers |
| Bass Extension (-10dB) | 50Hz (measured, Erin’s Audio Corner) | - |
| Bass Extension (-3dB) | 75Hz (measured, Erin’s Audio Corner) | - |
| Dimensions | 13"H x 7.5"W x 11"D (330.2 x 190.5 x 279.4 mm) | 15.5"H x 9.5"W x 9.8"D (394 x 241 x 248 mm) |
| Impedance | 8 ohms nominal (measured, Erin’s Audio Corner) | 6 ohms |
| Sensitivity | 86dB (measured by Erin’s Audio Corner; 87dB manufacturer specified) | 85dB (2.83V/1m, measured, Audio Science Review) |
| Drivers | 6.5" bilaminate paper cone woofer, 1" Terylene dome tweeter | 6.5" bass/mid driver, 1" titanium dome tweeter |
| Weight | 11.9 lbs / 5.4 kg each | 20.1 lbs / 9.1 kg each |
| Woofer Cabinet | ported | - |
| Power Handling | - | 100W nominal, 400W max |
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- GR-Research X-LS Encore vs Polk Monitor XT20
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The Two Speakers In Full
Polk Monitor XT20: $279.00 Amazon Crutchfield
Pros: Two-way bookshelf design with a 1” tweeter and 6.5” woofer, part of Polk’s budget-friendly XT lineup (spanning roughly $200-700 across the series). Measures more linear and has fewer/smaller cabinet resonances than its smaller sibling, the XT15, making it - by the reviewer’s own assessment - probably the better of the two based on data alone. Reasonably good bass output for the price and size, with an F3 of 63Hz. Horizontal radiation of about ±50° gives a respectable, enjoyable soundstage width. Takes well to EQ correction - the early-reflections directivity trend is decently linear, meaning tonal adjustments can meaningfully improve the sound. Provides usable, respectable volume when paired with a subwoofer crossover, even though it isn’t intended to play extremely loud on its own.
Cons: Notably bright treble, elevated roughly 1-5dB above the midrange depending on frequency - a characteristic shared across the whole Polk XT lineup, requiring either EQ or toe-out to tame. Small resonances appear around 300Hz and 800Hz, with some of that energy leaking from the port area. Vertical listening window is narrow - best kept close to the tweeter axis, with only a couple of degrees of tolerance above or below before the sound changes. Still needs a subwoofer for real low-end extension despite the decent F3. Overall linearity isn’t state-of-the-art flat, and while the reviewer found it pleasant, some artificial brightness remains even after basic EQ correction in the crossover region.
Full Polk Monitor XT20 review and specifications →
| Bass Extension (-10dB) | 50Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 75Hz (measured, Erin's Audio Corner) |
| Dimensions | 13"H x 7.5"W x 11"D (330.2 x 190.5 x 279.4 mm) |
| Drivers | 6.5" bilaminate paper cone woofer, 1" Terylene dome tweeter |
| Impedance | 8 ohms nominal (measured, Erin's Audio Corner) |
| Sensitivity | 86dB (measured by Erin's Audio Corner; 87dB manufacturer specified) |
| Weight | 11.9 lbs / 5.4 kg each |
| Woofer Cabinet | ported |
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JBL XPL-90: $1,298 used, discontinued (vintage, late 1980s)
Pros: Nearly ruler-flat on-axis response up to 1kHz with even horizontal directivity until the tweeter beams above 10kHz. The reviewer found real strength with vocals and simpler instrumentation, calling it “the first speaker I have liked that has some clear response errors” and “an enjoyable speaker” despite the flaws. Titanium tweeter and internal Monster cable wiring reflect JBL’s higher-end late-1980s engineering.
Cons: Crossover region peaking around 3kHz and treble peaking above 10kHz color the top end, and poor vertical directivity means the tweeter needs to be at ear level. Distortion rises at 96dB SPL, especially around 3kHz. Long discontinued; only available on the used market.
Full JBL XPL-90 review and specifications →
| Dimensions | 15.5"H x 9.5"W x 9.8"D (394 x 241 x 248 mm) |
|---|---|
| Drivers | 6.5" bass/mid driver, 1" titanium dome tweeter |
| Impedance | 6 ohms |
| Power Handling | 100W nominal, 400W max |
| Sensitivity | 85dB (2.83V/1m, measured, Audio Science Review) |
| Weight | 20.1 lbs / 9.1 kg each |
As an eBay Partner, we may be compensated if you make a purchase.
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons