Monitor Audio Radius 90
4" Executive Desktop Speaker
Monitor Audio Radius 90 looking much larger than life; it fits in the palm of my hand! (8 Ω, 4" aluminum woofer, 1" metal tweeter, 4.5" wide × 7.5" tall × 5.5" deep. The newest version sells for about $650 a pair at Crutchfield, while this older version sells for about $180/pair used (2024) or $200/pair used in 2013). I got mine at this link directly to them at eBay (see How to Win at eBay).
October 2013 All Reviews Audio Reviews B&W Reviews
These are very well made little speakers. The tweeters have a strong +11 dB resonance at 20 kHz which probably annoys dogs, and otherwise are very neutral. These are first-class speakers made in England.
I’d get these for style for use on an executive desktop; they’re wonderful in real wood, but so tiny that they only reproduce half the music. They cut off below about 150 Hz, not much deeper than an iPhone 16 Pro Max. These need subwoofers to get the Hi-Fi sound that they do so well above 200 Hz.
Measurements
Genuine swept sine wave measurements with the R&S UPL:
Monitor Audio Radius 90 Frequency Response.
Monitor Audio Radius 90 Frequency Response, closer-microphone.
Monitor Audio Radius 90 Port Frequency Response, measured from 3 cm.
Monitor Audio Radius 90 Frequency Response measured from 10 cm on side.
Monitor Audio Radius 90 complex impedance, cursor at 65 Hz port resonance.
Monitor Audio Radius 90 complex impedance, cursor at 142 Hz impedance peak.
Monitor Audio Radius 90 Total Harmonic Distortion with constant 900 mV (100 mW nominal at 8Ω) input.
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