The online audio platform Bonedo recently published an in-depth review of our SPL Phonos duo phono preamplifier, including audio samples. Here’s a summary of their impressions.
Design & Controls:
“The review unit supplied by SPL came in black. In addition to the black version, the manufacturer also offers the Phonos duo in red and silver, providing a wider range of color options.”
“Weighing 3.2 kg (7 lbs.), the unit sits securely on its four feet without slipping. The rounded corners of both the front and rear panels give the enclosure an elegant, refined appearance.”
“Unlike many competing phono preamps, the Phonos duo offers an impressive range of features, all accessible directly from the front panel—with the exception of the ground lift. The two large rotary controls make operation particularly intuitive and comfortable.”
120V VOLTAiR Technology:
“The Phonos duo uses RIAA filters based on Douglas Self’s design. As with all SPL phono preamps, it features the company’s highly acclaimed 120V VOLTAiR technology. SPL developed its own operational amplifiers specifically for this platform, running at ±60V instead of the conventional ±15V. The result is significantly greater headroom and remarkably improved micro-dynamics. The listening experience feels effortlessly relaxed because none of the internal components are operating near their performance limits.”
Sound:
“Considering the Phonos duo’s price, it’s fair to expect exceptional sound quality—and right from the start, my expectations were exceeded in many respects.”
“Maximum transparency and incredibly accurate transient reproduction without ever becoming fatiguing.”
“Vocals sound exceptionally natural and never exaggerated.”
“Bass reproduction is consistently controlled, powerful, and authoritative.”
Conclusion:
“With the Phonos duo, SPL delivers an exceptionally attractive and beautifully built high-end phono preamp for both MM and MC cartridges, offering professional features and outstanding ease of use.”
“The numerous essential sound-shaping options can be used extremely effectively, making it easy to adapt the phono signal to virtually any system. The result is always a remarkably relaxed yet highly precise listening experience.”
“Sonically, I find the SPL Phonos duo absolutely stunning—effortlessly detailed and equally at home with every musical genre. Its expansive soundstage, combined with razor-sharp imaging, creates outstanding instrument separation and incredibly precise spatial localization.”
“With the Phonos duo, SPL raises the bar for features and sonic performance in the sub-$3,000 price range.”
“Given its outstanding sound quality and comprehensive feature set compared to the competition, I can do nothing less than award it 5 out of 5 Bonedo stars.”
For more information about the SPL Phonos duo, please visit the product page.





