Solid State Preamp Reviews

No grand pronouncements on the state of the industry or the even grander universe. No ruminations about the mysteries of the high end or the ultimate interconnect to immortality. Rather, a single, simple, indisputable fact: I needed a preamp.

I view preamplifiers the way my dog views vacuum cleaners: warily and a bit mystified by their existence. The less-is-more, straight-wire-with-gain approach has always seemed the correct one to me. The preamps I own often sit forlornly in my gear closet until I am in temporary need of their services.

Stereophile strives to distribute the wealth equally. Did that get your attention? What the statement refers to, in terminology devoid of dollar signs, is that Stereophile attempts to review products from different companies rather than repeatedly focus on products from a single company.

For the past decade or so, I haven't been using a preamplifier. The D/A processors I have been using all have volume controls, so I have been feeding their outputs directly to the power amplifiers. It would seem logical that having nothing in the signal path would have less of a degrading effect than a preamp's input and output sockets, switches, volume control, printed circuit-board traces, and active and passive parts, not to mention an additional pair of interconnects. However, with some of the preamplifiers I have auditioned in my system, there was no doubt that the sound quality improved compared with the direct connection from the digital processor.

The most recent of these preamps was the MBL N11 that Jason Victor Serinus reviewed in July 2021, which was preceded by the Pass Labs XP-32 I reviewed in March 2021, the Benchmark LA4 Kalman Rubinson reviewed in January 2020, and going back even further, the Ayre Acoustics KX-R Twenty I reviewed in December 2014, which was one of the products Ayre released to celebrate its 20th year of operation.

I am now reviewing the KX-8 line preamplifier, which costs $6500 in basic form.

Almost 14 years have passed since a review of a Soulution product appeared in the pages of Stereophile. Given the Swiss company's steady ascent in the high-end pantheon, it is high time that we again reached into the German-speaking region of Switzerland north of the Swiss Alps to evaluate another of the reference products from a company equally renowned for its sonic achievements and refined and elegant design aesthetic.

Enter the full-function Soulution 727 preamplifier ($74,975), whose optional MC/MM phono section ($11,975) will be evaluated in a future issue. Because Soulution claims that the 727 "sets benchmarks in terms of noise, phase errors, common mode rejection and distortion," one would hope that there's far more than 62lb of classy casework and an easy-to-handle lightweight remote to account for its price.

In Gramophone Dreams #88, I described the sound of TEAC's VRDS-701T CD transport as "dense and precise in a way I had never previously heard from digital." I went on to explain, "by 'dense,' I mean there was a tangible corporeality effected by seemingly infinite quantities of small, tightly packed molecules of musical information."

What I noticed most during the review period was the extraordinary volume of data the 701T was vacuuming off those pits and lands and turning into music. As I have gotten to know it better, what I've noticed most is how the 701T sorts and delivers all that data in a manner that makes every DAC I pair it with sound more corporal and dynamic.

As I wrote that review, I wondered how the 701T would perform partnered with its matching UD-701N converter/streamer/preamplifier and how the TEAC flagship DAC's sound character would compare to flagship DACs from HoloAudio, Denafrips, and dCS.

In my early years in audio, I witnessed the rise and fall of the AM-FM receiver, first in vacuum tube mono and later in solid state stereo. Some of them grew to be behemoths, supporting multiple inputs, equalizers, dual speaker zones, and powerful amplifiers. When radio sources receded in popularity and with the rise of CDs, cable TV, and DVD, radio receivers were replaced by A/V receivers in the mainstream market.

Today, the ascension of streaming as the conduit for both audio and video content has nudged these, too, from the center stage. One can stream content from the bewildering variety of products with internet access including cell phones, smart TVs, almost any computer, and of course, dedicated streaming devices from the cheap-and-cheerful to seriously audiophile. If your music is on the web or on a NAS, many of these will let you browse for it, find it, and play it.