Short answer: the Monitor Audio Silver 50 7G for better sound quality, the KEF Q150 for the lower price. The Monitor Audio Silver 50 7G ranks #12 of 63 bookshelf speakers at $799. The KEF Q150 ranks #23 at $350, $449 cheaper.
On the Monitor Audio Silver 50 7G side: The 7th generation C-CAM Gold Dome tweeter with UD Waveguide II and RST II mid bass driver produce a listening window smoothness score of 0.50 at an accessible price, earning a Hi-Fi News Outstanding Product Award. The catch: The on axis response trends noticeably upward toward the treble (measured slope +0.50 per octave, the steepest of any speaker in this batch), which can read as bright on already bright recordings.
What the KEF Q150 gets right: Two-way coaxial (Uni-Q) design with a 1” dome tweeter and 5.25” mid-range time-aligned in a single driver assembly, available in ported or sealed configuration. Set against that: A high-frequency lift in the estimated in-room response makes it sound noticeably brighter in an untreated room than in a heavily acoustically-treated one - a real preference factor depending on your room’s furnishings.
Buy the Monitor Audio Silver 50 7G if sound quality matters more than the price. Buy the KEF Q150 if the price matters more than sound quality.
Specifications Side By Side
| Monitor Audio Silver 50 7G | KEF Q150 | |
|---|---|---|
| Price | $799 | $350 Discontinued |
| Ranked | #12 of 63 in Medium Size Bookshelf Speakers | #23 of 63 in Medium Size Bookshelf Speakers |
| Enclosure | ported | - |
| Drivers | 1" C-CAM Gold Dome tweeter, 5.25" C-CAM RST II mid bass driver | 130mm (5.25") aluminium Uni-Q woofer, 25mm (1") vented aluminium dome tweeter |
| Dimensions | 11.1"H x 6.5"W x 10.7"D (282 x 165 x 272 mm) (11.125 x 6.5 x 10.375 in) | 11.9"H x 7.1"W x 10.9"D (303 x 180 x 278 mm) |
| Weight | 12.3 lbs / 5.6 kg (12 lbs 6 oz) each | 12.3 lbs / 5.6 kg each |
| Sensitivity | 86dB @ 2.83V/1m | ~85dB (300Hz-3kHz on-axis, measured, Erin’s Audio Corner) |
| Impedance | 8 ohms nominal, 3.9 ohms minimum | 8 ohms nominal, about 4.7 ohms minimum (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 87.9Hz (measured, Erin’s Audio Corner) | 51Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-10dB) | 50.7Hz (measured, Erin’s Audio Corner) | 44Hz (measured, Erin’s Audio Corner) |
| Max SPL | 104dB | - |
| Crossover Points | 2.6kHz | - |
| Port Tuning | 58Hz | - |
| Power Output (Watts) | 100W RMS handling, 40-100W recommended amplifier power | - |
| Warranty | Lifetime, parts and labor | - |
| Country | China | - |
| Discontinued | - | Yes |
| Woofer Cabinet | - | ported, rear |
Related Speaker Comparisons
More useful head-to-heads from the same speaker class:
- Tekton Troubadour vs ELAC Uni-Fi 2.0 UB52
- Revel M105 vs Polk Audio XT15
- Revel M105 vs Sony SS-CS5 M2
- Monitor Audio Silver 50 7G vs Wharfedale Diamond 220
- KEF Q150 vs Dynaudio Emit M10
The Two Speakers In Full
Monitor Audio Silver 50 7G: $799 Crutchfield
Pros: The 7th generation C-CAM Gold Dome tweeter with UD Waveguide II and RST II mid bass driver produce a listening window smoothness score of 0.50 at an accessible price, earning a Hi-Fi News Outstanding Product Award. A HiVe II reflex port system is tuned to 58Hz for real bass weight from a compact 5.25 inch two way.
Cons: The on axis response trends noticeably upward toward the treble (measured slope +0.50 per octave, the steepest of any speaker in this batch), which can read as bright on already bright recordings. The sound power directivity index also has the widest standard deviation in this batch, 3.95, meaning off axis energy tracks the on axis response less consistently than the rest of this group. Bass extension is limited to a measured 87.9Hz at -3dB, so a subwoofer is recommended for full range use, and minimum impedance dips to 3.9 ohms at 250Hz.
Full Monitor Audio Silver 50 7G review and specifications →
| Bass Extension (-10dB) | 50.7Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 87.9Hz (measured, Erin's Audio Corner) |
| Country | China |
| Crossover Points | 2.6kHz |
| Dimensions | 11.1"H x 6.5"W x 10.7"D (282 x 165 x 272 mm) (11.125 x 6.5 x 10.375 in) |
| Drivers | 1" C-CAM Gold Dome tweeter, 5.25" C-CAM RST II mid bass driver |
| Enclosure | ported |
| Impedance | 8 ohms nominal, 3.9 ohms minimum |
| Max SPL | 104dB |
| Port Tuning | 58Hz |
| Power Output (Watts) | 100W RMS handling, 40-100W recommended amplifier power |
| Sensitivity | 86dB @ 2.83V/1m |
| Warranty | Lifetime, parts and labor |
| Weight | 12.3 lbs / 5.6 kg (12 lbs 6 oz) each |
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- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Monitor Audio Silver 50 7G vs Revel M105
- Monitor Audio Silver 50 7G vs Elac Carina BS243.4
- Monitor Audio Silver 50 7G vs Klipsch RP-500M II
- Monitor Audio Silver 50 7G vs Wharfedale Super Denton
- Monitor Audio Silver 50 7G vs Wharfedale Diamond 12.1
- Monitor Audio Silver 50 7G vs KEF LS50 Meta
- Monitor Audio Silver 50 7G vs Wharfedale Diamond 220
- Monitor Audio Silver 50 7G vs Polk Audio XT15
KEF Q150: $350 Discontinued Amazon
Pros: Two-way coaxial (Uni-Q) design with a 1” dome tweeter and 5.25” mid-range time-aligned in a single driver assembly, available in ported or sealed configuration. Exceptional soundstage depth, a hallmark of KEF’s coaxial designs that the reviewer says few other speakers match. Bass extension reaches into kick-drum territory, respectable for a compact bookshelf speaker. Resonances present in measurements are consistent across on- and off-axis readings, meaning they can be effectively corrected with EQ. Distortion profile is essentially the same whether run sealed or ported, since a subwoofer crossover point sits above where the differences would matter anyway. At its sale price (around $300, sometimes seen at $400), the reviewer considers it a clear step up from his previous budget favorite in this range, the Emotiva B1+, mainly due to the superior soundstage depth.
Cons: A high-frequency lift in the estimated in-room response makes it sound noticeably brighter in an untreated room than in a heavily acoustically-treated one - a real preference factor depending on your room’s furnishings. A mild dip in the 1-2kHz region reduces vocal fullness somewhat. Unexplained resonances appear in measurements and persist in both sealed and ported configurations, pointing to enclosure or panel vibration rather than the port. Horizontal radiation is narrower than the reviewer generally prefers from KEF’s lineup, with directivity that widens somewhat around 1.2kHz (near a resonance) and again above about 5kHz. Compression testing at high output (102dB) shows significant nonlinearity, especially at lower frequencies - noticeably worse than a comparable Arendal bookshelf speaker costing over twice as much, which held up better until 80Hz. Not intended for loud listening without a subwoofer - the woofer will over-exert itself without a high-pass filter, and the reviewer recommends crossing over at 80-120Hz. At full retail price (around $600/pair), the value proposition is far less certain than at sale pricing. Discontinued.
Full KEF Q150 review and specifications →
| Bass Extension (-10dB) | 44Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 51Hz (measured, Erin's Audio Corner) |
| Dimensions | 11.9"H x 7.1"W x 10.9"D (303 x 180 x 278 mm) |
| Discontinued | Yes |
| Drivers | 130mm (5.25") aluminium Uni-Q woofer, 25mm (1") vented aluminium dome tweeter |
| Impedance | 8 ohms nominal, about 4.7 ohms minimum (measured, Erin's Audio Corner) |
| Sensitivity | ~85dB (300Hz-3kHz on-axis, measured, Erin's Audio Corner) |
| Weight | 12.3 lbs / 5.6 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
- Erin’s Audio Corner: Kef’s Cheapest Bookshelf. Is the Q150 worth your money?
- Erin’s Audio Corner Website KEF Q150
- GR-Research: KEF Q150… can it get any BETTER?
- Erin’s Audio Corner: 5 AWESOME SPEAKERS Under $1000 You Won’t Regret
- Erin’s Audio Corner: Budget Stereo Systems You Will Love
- Erin’s Audio Corner Measurements (spinorama.org)
- Reddit Search for KEF Q150 Review
- Head-to-Head Comparisons