Short answer: the RSL CG23M, though neither ranks well in its class. It ranks #131 of 168 bookshelf speakers by sound quality, rated 2.6/5, at $298. The Micca RB42 ranks #143, rated 2.3/5, at $159.99, $138.01 cheaper, not enough of a saving to outweigh the sound-quality gap. Both are rated below 3.0/5 among the 168 bookshelf speakers, and the Ascend Acoustics HTM-200SE2, ranked #7 at $368, is a better place to start if sound quality matters.
The RSL CG23M is the better-sounding pick. RSL’s current MTM monitor, two 4” mineral-filled aramid woofers around a 1” silk dome tweeter in a Compression Guide cabinet, rated at 89dB so it is easy to drive. The catch: No independent measurements yet, so its tonal balance and directivity can’t be compared with ranked speakers.
The case for the Micca RB42: Curved cabinet fit and finish look closer to a speaker costing three times as much. The catch: 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.”
Buy the RSL CG23M. It is rated higher for sound quality, and saving $138.01 with the Micca RB42 does not make up for the sound-quality gap.
Worth knowing: the RSL CG23M has not been measured yet. Its rating is estimated from related models, with a likely range of 2.2 to 3.0, so treat this verdict as provisional.
Still deciding? The full Passive Home rankings cover every ranked option.
Specifications Side By Side
| RSL CG23M | Micca RB42 | |
|---|---|---|
| Price | $298 per pair | $159.99 per pair |
| Ranked | #131 of 168 in Medium Size Bookshelf Speakers Estimated | #143 of 168 in Medium Size Bookshelf Speakers |
| Bass Extension (-3dB) | 80Hz (manufacturer specified) | 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 |
| Drivers | 2x 4” mineral-filled woven aramid fiber woofers, 1x 1” silk dome tweeter | 4” coated paper woofer, 0.75” silk dome tweeter |
| Frequency Response | 80Hz - 20kHz (±3dB, manufacturer specified) | 50Hz - 20kHz (Manufacturer specified, typical in-room) |
| Impedance | 4 ohms nominal (manufacturer specified) | 4-8 ohms |
| Sensitivity | 89dB (manufacturer specified) | 80dB (2.83V/1m, measured, Audio Science Review) |
| Crossover Frequency | 2,800Hz | - |
| Recommended Power | 40W - 150W | - |
| Enclosure | Compression Guide | - |
| Weight | 9.9 lbs (4.5 kg) | 6 lbs (2.7 kg) each (per retailer listing) |
| Dimensions | 16”H x 6”W x 6.5”D (406 x 152 x 165 mm) | 8.7H x 4.9W x 7.9D in |
| 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 |
| Power Handling | - | 15-100W each |
| Woofer Cabinet | - | ported, front |
| Spinorama Preference Score | - | 4.59 |
| Spinorama Preference Score with Perfect Sub | - | 6.87 |
| DIY Kit | - | No |
Related Speaker Comparisons
More top alternatives to RSL CG23M:
- RSL CG23M vs Parts Express Copperhead Desktop Kit
- RSL CG23M vs Cambridge Audio Minx Min 22
- Wharfedale Diamond 220 vs Micca RB42
- JBL Stage A120 vs Micca RB42
- Micca RB42 vs Boston Acoustics A25
Prices on this page were last checked October 11, 2026 at 4:59 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
RSL CG23M: $298 per pair Estimated RSL eBay
Older model: the RSL CG23 (estimated 2.4/5). See every RSL CG generation.
Same family: the RSL CG3M (smaller bookshelf, ranked lower, estimated 2.4/5).
Pros: RSL’s current MTM monitor, two 4” mineral-filled aramid woofers around a 1” silk dome tweeter in a Compression Guide cabinet, rated at 89dB so it is easy to drive. It replaced the CG23 and works upright as a main or surround speaker or on its side as a center.
Cons: No independent measurements yet, so its tonal balance and directivity can’t be compared with ranked speakers. Rated only from 80Hz, so it needs a subwoofer, and its 4 ohm load suits receivers set to 6 or 8 ohms as RSL recommends.
Full RSL CG23M review and specifications →
| Released | Oct 2022 (4 years ago) |
|---|---|
| Bass Extension (-3dB) | 80Hz (manufacturer specified) |
| Crossover Frequency | 2,800Hz |
| Dimensions | 16”H x 6”W x 6.5”D (406 x 152 x 165 mm) |
| Drivers | 2x 4” mineral-filled woven aramid fiber woofers, 1x 1” silk dome tweeter |
| Enclosure | Compression Guide |
| Frequency Response | 80Hz - 20kHz (±3dB, manufacturer specified) |
| Impedance | 4 ohms nominal (manufacturer specified) |
| Recommended Power | 40W - 150W |
| Sensitivity | 89dB (manufacturer specified) |
| Weight | 9.9 lbs (4.5 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons
Micca RB42: $159.99 per pair Amazon eBay
Same family: the Micca RB42-C (center, estimated 2.1/5).
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