Short answer: the Arendal 1961 Monitor. It ranks #8 of 179 bookshelf speakers by sound quality (rated 4.3/5) at $1,150 and is still sold new; the KEF Q150 ranks #48 (rated 3.7/5) and is discontinued, so it is only an option used. The KEF Q150’s replacement, the KEF Q1 Meta, is rated 3.6/5 at $399.99.
The KEF Q150 is the more accurate, deeper-bass choice. Compact bookshelf speakers with a tweeter set in the center of the woofer, usable ported or sealed and easy to correct with EQ. Its measured preference score, a predictor of how neutral it sounds, is 4.86 against 3.38 for the Arendal 1961 Monitor. Its bass reaches about 51Hz before falling 3dB, against 84Hz for the Arendal 1961 Monitor. The catch: 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.
The Arendal 1961 Monitor is the better-sounding pick. A tank built sealed monitor with two 5.5 inch woofers, neutral sound and low distortion, great as home theater mains or surrounds. The tradeoff: Bass rolls off around 70-80Hz, so it cannot be used as full-range mains for music without a subwoofer, and a sub is recommended for home theater use as well.
Buy the Arendal 1961 Monitor. It is rated higher for sound quality and still sold new, while the KEF Q150 is discontinued.
Want more options? Browse the full Passive Home rankings.
Measured Differences
- Bass depth: the KEF Q150 reaches 44 Hz (10 dB down) against 60 Hz for the Arendal 1961 Monitor, about half an octave deeper. You hear more of the lowest bass notes and kick drums.
- Close enough not to matter: preference score with a subwoofer (7.1 vs 6.7).
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Specifications Side By Side
| KEF Q150 | Arendal 1961 Monitor | |
|---|---|---|
| Price | $350 per pair Discontinued | $1150 per pair |
| Ranked | #48 of 179 in Medium Size Bookshelf Speakers | #8 of 179 in Medium Size Bookshelf Speakers |
| Bass Extension (-10dB) | 44Hz (measured, Erin’s Audio Corner) | 60Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 51Hz (measured, Erin’s Audio Corner) | 84Hz (measured, Erin’s Audio Corner) |
| Dimensions | 11.9”H x 7.1”W x 10.9”D (303 x 180 x 278 mm) | 16.6”H x 6.4”W x 5.9”D (421.6 x 162.6 x 149.9 mm) |
| Impedance | 8 ohms nominal, about 4.7 ohms minimum (measured, Erin’s Audio Corner) | 4 ohms nominal (4.1 ohms minimum above 80Hz, measured by Erin’s Audio Corner) |
| Sensitivity | ~85dB (300Hz-3kHz on-axis, measured, Erin’s Audio Corner) | 85.9dB (measured average, Erin’s Audio Corner) |
| Drivers | 130mm (5.25”) aluminium Uni-Q woofer, 25mm (1”) vented aluminium dome tweeter | 2 x 5.5” woofers, 28mm tweeter |
| Weight | 12.3 lbs (5.6 kg) each | 16 lbs (7.25 kg) each |
| Woofer Cabinet | ported, rear | sealed |
| Spinorama Preference Score | 4.86 | 3.38 |
| Spinorama Preference Score with Perfect Sub | 7.06 | 6.69 |
| DIY Kit | No | No |
| Crossover Frequency | - | 1500Hz |
Where the Ratings Come From
- KEF Q150: Spinorama.org measurements and reviews by Erin’s Audio Corner and GR-Research.
- Arendal 1961 Monitor: Spinorama.org measurements and reviews by Erin’s Audio Corner and Audio Science Review.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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