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  • SoundStage! InSight - Hegel H90 and H190 Integrated Amplifiers (October 2017)
  • SoundStage! Shorts - How Hegel's SoundEngine Works (October 2017)
  • SoundStage! InSight  - Estelon History and YB and Extreme Loudspeakers (September 2017)
  • SoundStage! Shorts - What Makes Hegel Different? (August 2017)
  • SoundStage! Shorts - Estelon Extreme Legacy Edition Loudspeaker (July 2017)
  • SoundStage! InSight - Amphion Overview and Technologies (July 2017)
  • SoundStage! Insight - Totem Acoustic Signature One Loudspeaker (June 2017)
  • SoundStage! Encore - The Cowboy Junkies'
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  • SoundStage! Shorts -- Paradigm's Perforated Phase Alignment (PPA) Lenses (March 2017)
  • SoundStage! InSight -- Paradigm's Persona 9H Loudspeaker (March 2017)
  • SoundStage! InSight -- Contrasts: Dynaudio's Contour and Focus XD Speaker Lines (February 2017)
  • SoundStage! Shorts - New Technologies in MartinLogan's Masterpiece Series
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  • SoundStage! InSight - Dynaudio History and Driver Technology (October 2016)
  • SoundStage! Shorts - The Story How Gryphon Began (September 2016)
  • SoundStage! InSight - Devialet History, ADH Technology, and Expert 1000 Pro (September 2016)
  • SoundStage! Shorts - Devialet's Phantom Loudspeakers (August 2016)
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  • SoundStage! Shorts - GoldenEar Technology's Anechoic Chamber (May 2016)
  • SoundStage! Shorts - PSB's M4U 4 Earphones (April 2016)
  • SoundStage! InSight - GoldenEar Technology's Triton Two+ and Three+ Loudspeakers (March 2016)
  • SoundStage! Shorts -- KEF's LS50 (February 2016)
  • SoundStage! InSight -- Monitor Audio's Platinum II Series (January 2016)
  • SoundStage! Shorts -- Pryma 0|1 Headphones (December 2015)
  • SoundStage! InSight -- KEF's Blade Two Loudspeaker (November 2015)
  • SoundStage! InSight -- KEF and the Uni-Q (October 2015)
  • SoundStage! InSight -- Monitor Audio Acoustics & Aesthetics (August 2015)
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  • SoundStage! InSight -- Hegel's H160 Integrated Amplifier-DAC (April 2015)
  • SoundStage! InSight -- MartinLogan's Neolith Loudspeaker (February 2015)

To Hans Wetzel,

Great review on Rogue Audio’s Sphinx integrated amplifier. I just bought a pair of KEF LS50s and this amp sounds like a great match for them. I wanted to solicit your opinion. Also intriguing is Rogue's all-tube integrated, the Cronus. I have the feeling a tube amp/preamp would compliment the punchiness of the KEFs. Alternatively, the gentleman from whom I purchased the KEFs, Steve Monte at Quest for Sound, outside of Philadelphia, recommended one of his amps, such as the Sound Quest SQ-88, a tube integrated rated at 55Wpc. Do you have any suggestions? I like all types of music but need to listen fairly loud due to some hearing loss. Thanks in advance for your suggestions and Happy New Year!

Best regards,
Robert Segal

The Sphinx would be a great partner for the LS50s. We measured the LS50 and found the sensitivity to be 84.25dB (2.83V/m), which is a little on the low side. The upside is that the little guys are pretty easy to drive, with a minimum impedance of around 4 ohms at 200Hz. The Cronus could also work, as it produces 100Wpc. The SQ-88’s 55Wpc might not be enough for your needs, however. If pushed hard, as you mention they probably will be, the LS50s might distort as the SQ-88 runs out of power. I would probably rule that one out.

I haven’t heard the Cronus, personally, but I’m sure it’s a quality product -- Rogue does good work. If tubes are your cup of tea, then I say go for it. Personally, I would spring for the Sphinx. At $1395 with the optional remote control, I think it offers terrific performance for the money, and it sounded great with my larger KEF R900s. . . . Hans Wetzel