Short answer: the Moondrop M4P MTM for better sound quality, the KEF Q150 for the lower price. The Moondrop M4P MTM ranks #11 of 74 bookshelf speakers at $920. The KEF Q150 ranks #25 at $350, $570 cheaper.
What the KEF Q150 offers: 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. Watch for: 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.
What the Moondrop M4P MTM offers: MTM (mid-tweeter-mid) two-way layout with dual 4” carbon-cone woofers flanking a 1” aluminum-magnesium dome tweeter, crossed over at 1.8kHz. Wide horizontal radiation of about ±60° through the midrange and still around ±50° near the tweeter, giving an expansive, enveloping soundstage on well-recorded stereo material. Noticeable mid-bass “thump” around 100-160Hz that adds a sense of punch and kick-drum impact, more pronounced than the reviewer’s Audiofirst Fidelia reference. Rolled-off, laid-back treble (roughly 1-2dB below linear) rather than the 2-5dB high-frequency boost common on speakers marketed as “detailed” - a plus for listeners who find brighter speakers fatiguing. Tonal balance stays consistent whether pointed straight on or toed out about 30°, so side-to-side seating position doesn’t change the sound much. At $920/pair in a compact monitor cabinet (13-14 lbs), reasonably priced for the format. Watch for: Vertical placement is very fussy: staying within about ±20° of the tweeter axis is essential, because the two woofers cancel each other through the crossover region (classic MTM lobing) - sit above or below that window and the upper midrange loses clarity and detail. SPL-limited: noticeable compression showed up both subjectively (thinner-sounding transients at 80-85dB/10 feet) and in measurements, with roughly 1.5dB of dynamic-range loss and about 3dB of added distortion under instantaneous compression testing. Harmonic distortion jumps substantially at 96dB versus 86dB (mostly second-order, so less audible than it looks on paper), and multitone distortion rides right at the reviewer’s 3% threshold at full output. Low impedance (3.7-ohm minimum, 1.7-ohm minimum EPDR) means a Class AB amp may run hot over longer sessions; a Class D amp is recommended for better thermal headroom. Designed primarily for nearfield use (about 1 meter); farfield listening is more of a gamble since dynamic range drops off noticeably at distance. Slight sibilance and a mild upper-midrange dip give a touch of a recessed, warm character alongside the bass emphasis. Bass reaches only about 50-60Hz in-room, and not with much volume before running into the SPL limits noted above.
Buy the KEF Q150 if the price matters more than sound quality. Buy the Moondrop M4P MTM if sound quality matters more than the price.
Specifications Side By Side
| KEF Q150 | Moondrop M4P MTM | |
|---|---|---|
| Price | $350 Discontinued | $920 |
| Ranked | #25 of 74 in Medium Size Bookshelf Speakers | #11 of 74 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 44Hz (measured, Erin’s Audio Corner) | 46Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 51Hz (measured, Erin’s Audio Corner) | 69Hz (measured, Erin’s Audio Corner) |
| Dimensions | 11.9"H x 7.1"W x 10.9"D (303 x 180 x 278 mm) | 15"H x 6.1"W x 7.3"D (380 x 155 x 185 mm) |
| Impedance | 8 ohms nominal, about 4.7 ohms minimum (measured, Erin’s Audio Corner) | 4 ohms nominal, 3.7 ohms minimum (measured above 80Hz, Erin’s Audio Corner) |
| Sensitivity | ~85dB (300Hz-3kHz on-axis, measured, Erin’s Audio Corner) | 85dB (measured average 300Hz-3kHz @ 2.83V/1m, Erin’s Audio Corner) |
| Drivers | 130mm (5.25") aluminium Uni-Q woofer, 25mm (1") vented aluminium dome tweeter | 2x 4" (87mm) carbon cone woofer, 1" (25mm) aluminum/magnesium dome tweeter |
| Discontinued | Yes | - |
| Weight | 12.3 lbs / 5.6 kg each | 13.7 lbs / 6.2 kg each |
| Woofer Cabinet | ported, rear | ported |
| Crossover Frequency | - | 1800Hz |
| Power Handling | - | 75W rated / 150W max |
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- Moondrop M4P MTM vs Zaph Audio ZA5.2 TM
- Klipsch RP-500M II vs Moondrop M4P MTM
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The Two Speakers In Full
KEF Q150: $350 Discontinued Amazon eBay
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 |
- Links
- Reviews, Comparisons and Sound Samples
- Erin’s Audio Corner: Kef’s Cheapest Bookshelf. Is the Q150 worth your money? More from Erin’s Audio Corner →
- Erin’s Audio Corner Website KEF Q150
- GR-Research: KEF Q150… can it get any BETTER? More from GR-Research →
- 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
Moondrop M4P MTM: $920 Shenzhenaudio eBay
Pros: MTM (mid-tweeter-mid) two-way layout with dual 4” carbon-cone woofers flanking a 1” aluminum-magnesium dome tweeter, crossed over at 1.8kHz. Wide horizontal radiation of about ±60° through the midrange and still around ±50° near the tweeter, giving an expansive, enveloping soundstage on well-recorded stereo material. Noticeable mid-bass “thump” around 100-160Hz that adds a sense of punch and kick-drum impact, more pronounced than the reviewer’s Audiofirst Fidelia reference. Rolled-off, laid-back treble (roughly 1-2dB below linear) rather than the 2-5dB high-frequency boost common on speakers marketed as “detailed” - a plus for listeners who find brighter speakers fatiguing. Tonal balance stays consistent whether pointed straight on or toed out about 30°, so side-to-side seating position doesn’t change the sound much. At $920/pair in a compact monitor cabinet (13-14 lbs), reasonably priced for the format.
Cons: Vertical placement is very fussy: staying within about ±20° of the tweeter axis is essential, because the two woofers cancel each other through the crossover region (classic MTM lobing) - sit above or below that window and the upper midrange loses clarity and detail. SPL-limited: noticeable compression showed up both subjectively (thinner-sounding transients at 80-85dB/10 feet) and in measurements, with roughly 1.5dB of dynamic-range loss and about 3dB of added distortion under instantaneous compression testing. Harmonic distortion jumps substantially at 96dB versus 86dB (mostly second-order, so less audible than it looks on paper), and multitone distortion rides right at the reviewer’s 3% threshold at full output. Low impedance (3.7-ohm minimum, 1.7-ohm minimum EPDR) means a Class AB amp may run hot over longer sessions; a Class D amp is recommended for better thermal headroom. Designed primarily for nearfield use (about 1 meter); farfield listening is more of a gamble since dynamic range drops off noticeably at distance. Slight sibilance and a mild upper-midrange dip give a touch of a recessed, warm character alongside the bass emphasis. Bass reaches only about 50-60Hz in-room, and not with much volume before running into the SPL limits noted above.
Full Moondrop M4P MTM review and specifications →
| Bass Extension (-10dB) | 46Hz (measured, Erin's Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 69Hz (measured, Erin's Audio Corner) |
| Crossover Frequency | 1800Hz |
| Dimensions | 15"H x 6.1"W x 7.3"D (380 x 155 x 185 mm) |
| Drivers | 2x 4" (87mm) carbon cone woofer, 1" (25mm) aluminum/magnesium dome tweeter |
| Impedance | 4 ohms nominal, 3.7 ohms minimum (measured above 80Hz, Erin's Audio Corner) |
| Power Handling | 75W rated / 150W max |
| Sensitivity | 85dB (measured average 300Hz-3kHz @ 2.83V/1m, Erin's Audio Corner) |
| Weight | 13.7 lbs / 6.2 kg each |
| Woofer Cabinet | ported |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Moondrop M4P MTM vs Ascend Acoustics Luna V2 Mini-Monitor Titan
- Moondrop M4P MTM vs Arendal 1961 Monitor
- Moondrop M4P MTM vs Klipsch RP-500M II
- Moondrop M4P MTM vs KEF LS50 Meta
- Moondrop M4P MTM vs Ascend Sierra 1 v2
- Moondrop M4P MTM vs Radiant Acoustics Clarity 4.2
- Moondrop M4P MTM vs Zaph Audio ZA5.2 TM