Short answer: the Revel Concerta2 F35. It ranks #23 of 68 floorstanding speakers by sound quality at $900; the Klipsch Heresy IV ranks #44 and costs $3198, so there is not much of a tradeoff to weigh.
What the Revel Concerta2 F35 offers: Two-and-a-half-way, four-driver design: a 1” aluminum dome tweeter on a waveguide, a 5.25” mid-range, and dual 5.25” mid-bass drivers in a rear-ported cabinet. Measured sensitivity of 89.4dB closely matches the 90dB spec, and distortion looks good at both 86dB and 96dB, holding up well even with a high-pass filter applied. At its sale price (around $900/pair, down from full retail), the reviewer calls it a “no-brainer,” undercutting comparable budget floorstanders like the ELAC DF63. Frequency response and directivity mismatches are largely EQ-able, since most of what shows up in measurements traces to physical tweeter/mid-range separation rather than a fundamental flaw. Compression is fairly well controlled for the price - about 1dB of loss around 100Hz under long-term compression, described as “par for the course” at this cost. Watch for: F3 of 61Hz and F10 of 39Hz mean a subwoofer is needed for real bass extension. A dip in the lower midrange/2-3kHz region reduces attack and detail, and a peak around 5kHz adds some edge and sibilance in the lower treble. A peak in off-axis energy around 3kHz reflects off sidewalls at roughly 60-70° off-axis and arrives louder than the direct sound - this specific issue can’t be fixed with EQ (boosting the direct sound would boost the stronger reflection too) and would need acoustic absorption to properly address, though the reviewer considers it a minor, optional fix at this price. A couple of minor resonances appear in the impedance plot, including one around 300Hz that may partly explain a subtle sense of vocal warmth noticed in listening, though it’s more likely room-related. Minimum impedance around 3.8 ohms. Short-term compression testing shows some increased distortion in the tweeter and higher-frequency compression at loud output.
What the Klipsch Heresy IV offers: Very high 94.5dB/2.83V/1m sensitivity in Erin’s anechoic measurement—well below Klipsch’s 99dB in-room claim, but still excellent—and strong short-term output from a 12-inch woofer plus horn-loaded midrange and tweeter. The compact, furniture-grade Heritage cabinet is easier to place than most high-efficiency designs, and dynamics at moderate levels can sound lively. A stable four-ohm-capable amplifier can produce substantial SPL with relatively little voltage. Watch for: Erin measured a 77Hz F3 and response rolling away near 100Hz in-room, so a subwoofer is required for modern full-range reproduction. The impedance dips to about 4 ohms, reducing the practical amplifier advantage implied by its sensitivity. Pronounced directivity mismatch at the driver transitions, impedance/response resonances and elevated distortion spikes around the crossover remain audible concerns that EQ cannot fully solve. At 102dB Erin measured roughly 1.5dB midband compression; at 96dB distortion rises around crossover. Performance is difficult to justify at the price, and Erin explicitly did not recommend it.
Buy the Revel Concerta2 F35. It ranks higher for sound quality than the Klipsch Heresy IV and costs less, so there is no real case for the other one.
Specifications Side By Side
| Revel Concerta2 F35 | Klipsch Heresy IV | |
|---|---|---|
| Price | $900 | $3,198/pair |
| Ranked | #23 of 68 in Large Size Floorstanding Speakers | #44 of 68 in Large Size Floorstanding Speakers |
| Bass Extension (-10dB) | 50Hz (measured, Erin’s Audio Corner) | 50.0Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 70Hz (measured, Erin’s Audio Corner) | 77Hz (measured, Erin’s Audio Corner) |
| Dimensions | 40.3"H x 8.4"W x 12.2"D (1023.6 x 213.4 x 309.9 mm) | 24.8"H x 15.6"W x 13.3"D |
| Impedance | 6 ohms nominal (3.8 ohms minimum, measured by Erin’s Audio Corner) | Approximately 4 ohms minimum (measured, Erin’s Audio Corner) |
| Sensitivity | 89.4dB (measured, Erin’s Audio Corner; 90dB manufacturer specified) | 94.5dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Drivers | 3x 5.25" deep anodized aluminum cone woofers, 1" Aluminum Tweeter | 1" horn-loaded tweeter; 1.75" horn-loaded midrange; 12" woofer |
| Weight | 41 lbs / 18.6 kg each | 45 lb each |
| Woofer Cabinet | ported, rear | ported, rear |
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The Two Speakers In Full
Revel Concerta2 F35: $900 Crutchfield eBay
Pros: Two-and-a-half-way, four-driver design: a 1” aluminum dome tweeter on a waveguide, a 5.25” mid-range, and dual 5.25” mid-bass drivers in a rear-ported cabinet. Measured sensitivity of 89.4dB closely matches the 90dB spec, and distortion looks good at both 86dB and 96dB, holding up well even with a high-pass filter applied. At its sale price (around $900/pair, down from full retail), the reviewer calls it a “no-brainer,” undercutting comparable budget floorstanders like the ELAC DF63. Frequency response and directivity mismatches are largely EQ-able, since most of what shows up in measurements traces to physical tweeter/mid-range separation rather than a fundamental flaw. Compression is fairly well controlled for the price - about 1dB of loss around 100Hz under long-term compression, described as “par for the course” at this cost.
Cons: F3 of 61Hz and F10 of 39Hz mean a subwoofer is needed for real bass extension. A dip in the lower midrange/2-3kHz region reduces attack and detail, and a peak around 5kHz adds some edge and sibilance in the lower treble. A peak in off-axis energy around 3kHz reflects off sidewalls at roughly 60-70° off-axis and arrives louder than the direct sound - this specific issue can’t be fixed with EQ (boosting the direct sound would boost the stronger reflection too) and would need acoustic absorption to properly address, though the reviewer considers it a minor, optional fix at this price. A couple of minor resonances appear in the impedance plot, including one around 300Hz that may partly explain a subtle sense of vocal warmth noticed in listening, though it’s more likely room-related. Minimum impedance around 3.8 ohms. Short-term compression testing shows some increased distortion in the tweeter and higher-frequency compression at loud output.
Full Revel Concerta2 F35 review and specifications →
| Bass Extension (-10dB) | 50Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 70Hz (measured, Erin's Audio Corner) |
| Dimensions | 40.3"H x 8.4"W x 12.2"D (1023.6 x 213.4 x 309.9 mm) |
| Drivers | 3x 5.25" deep anodized aluminum cone woofers, 1" Aluminum Tweeter |
| Impedance | 6 ohms nominal (3.8 ohms minimum, measured by Erin's Audio Corner) |
| Sensitivity | 89.4dB (measured, Erin's Audio Corner; 90dB manufacturer specified) |
| Weight | 41 lbs / 18.6 kg each |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Audio Science Review Revel Concerta2 F35 More from Audio Science Review →
- Erin’s Audio Corner: Revel F35 Review: Great Sound, Lower Price! More from Erin’s Audio Corner →
- Erin’s Audio Review Website Revel Concerta2 F35
- Audio Science Review Measurements (spinorama.org)
- Reddit Search for Revel Concerta2 F35 Review
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Klipsch Heresy IV: $3,198/pair Amazon Crutchfield eBay
Pros: Very high 94.5dB/2.83V/1m sensitivity in Erin’s anechoic measurement—well below Klipsch’s 99dB in-room claim, but still excellent—and strong short-term output from a 12-inch woofer plus horn-loaded midrange and tweeter. The compact, furniture-grade Heritage cabinet is easier to place than most high-efficiency designs, and dynamics at moderate levels can sound lively. A stable four-ohm-capable amplifier can produce substantial SPL with relatively little voltage.
Cons: Erin measured a 77Hz F3 and response rolling away near 100Hz in-room, so a subwoofer is required for modern full-range reproduction. The impedance dips to about 4 ohms, reducing the practical amplifier advantage implied by its sensitivity. Pronounced directivity mismatch at the driver transitions, impedance/response resonances and elevated distortion spikes around the crossover remain audible concerns that EQ cannot fully solve. At 102dB Erin measured roughly 1.5dB midband compression; at 96dB distortion rises around crossover. Performance is difficult to justify at the price, and Erin explicitly did not recommend it.
Full Klipsch Heresy IV review and specifications →
| Bass Extension (-10dB) | 50.0Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 77Hz (measured, Erin's Audio Corner) |
| Dimensions | 24.8"H x 15.6"W x 13.3"D |
| Drivers | 1" horn-loaded tweeter; 1.75" horn-loaded midrange; 12" woofer |
| Impedance | Approximately 4 ohms minimum (measured, Erin's Audio Corner) |
| Sensitivity | 94.5dB/2.83V/1m (measured, Erin's Audio Corner) |
| Weight | 45 lb each |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Klipsch Heresy IV vs Polk Audio XT60
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