The Miller & Kreisel IW150 is rated 3.6/5 for sound quality, #17 of 28 In-Wall & In-Ceiling Speakers. See all Passive Home rankings for every top pick.
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Brand: Miller & Kreisel
#17 Miller & Kreisel IW150: $4,998 per pair Audiolab (authorized M&K dealer) $2,499 eBay
Pros: An in-wall speaker with three tweeters beside two woofers, designed to spread sound evenly across a room from one opening. Erin’s Audio Corner’s Klippel measurement shows well controlled directivity (SPDI deviation 2.43dB) and a smooth predicted in-room response, with a preference score of 2.88, or 6.32 with a perfect subwoofer. The unusual layout puts two 5.25” polypropylene woofers beside a column of three 1” soft dome tweeters, a design meant to give even coverage across a room from a single wall opening. It is rated at 90dB sensitivity, and Erin’s measurement computed a real 88.2dB, and it accepts 25-400W of amplifier power. Measured bass extension of 95.2Hz (-3dB).
Cons: Bass is thin: measured -3dB is 95.2Hz and -6dB is 82.0Hz, and Miller & Kreisel rates it only to 80Hz, so a subwoofer is required, and even with a perfect subwoofer the score reaches only 6.32. On-axis smoothness is 0.48 and on-axis deviation averages 0.62dB, so the midrange is rougher than the better in-wall designs. At $2499 each a stereo pair costs twice that. Erin describes it as discontinued from what he can tell, so stock may be limited to remaining inventory.
Is the Miller & Kreisel IW150 right for you?
Buy it if
- you have a modest amplifier (90 dB sensitivity is easy to drive).
Skip it if
- you will not add a subwoofer: bass rolls off below about 95 Hz.
- you want the best value: the higher-rated Revel W553L costs about $3,908 less.
| Released | Around 2019 (about 7 years ago) |
|---|---|
| Bass Extension (-10dB) | 68.7Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 95.2Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 13.9”H x 12.2”W (354 x 311 mm) baffle (95mm mounting depth) |
| Drivers | 2x 5.25” polypropylene bass/midrange drivers, 3x 1” soft fabric dome tweeters |
| Enclosure | In-wall |
| Frequency Response | 80Hz-20kHz +/-3dB (manufacturer) |
| Impedance | 4 ohms |
| Mounting Cutout | 288W x 331H mm |
| Power Handling | 25-400W recommended amplifier power |
| Sensitivity | 90dB |
| Spinorama Preference Score | 2.88 |
| Spinorama Preference Score with Perfect Sub | 6.32 |
| Weight | 18.7 lbs (8.5 kg) |
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