Primare SP31.7 AV Preamp Reviewed
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Nothing was more telling of the change than the Primare SP31.7's front panel: only two rotary controls, four buttons and a display. Oh, and it's roughly half the height of the Lexicon, again suggesting 'stereo pre-amp' rather than 'all-singing, all-dancing digital brothel'.
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This sort of minimalism isn't the norm for home cinema processors capable of 192 kHz/24 bit processing for the various shades of Dolby (ProLogic, ProLogic II, Digital 5.1, Digital Surround EX 6.1, Digital Matrix 6.1) and the assorted DTS variants (Neo:6, 5.1, ES 6.1, ES 6.1 Discrete). Little on show, perhaps, but the unit also offers expansion potential for future upgrades, can handle seven channels, and incorporates a 5.1 channel analogue input for DVD-A and SACD. Because of the dearth of buttons, you could easily mistake this for a standard, two-channel analogue pre-amp, not something you can say of the breed of high-end A/V processors (or receivers) that seems conceived to instil techno-fear through the presence of too many controls. And yet at no time could I turn up anything Primare had left out....
The SP31.7 uses Primare's own proprietary DSP, developed by designer Mike Bladeleus and the Primare team, a chip 'which combines with superior analogue circuitry to deliver a class-leading range of processing options, including a 7.1 channel mode, and an elevated standard of multi-channel audio and video reproduction.' Designed to complement Primare's CD/DVD players, it was conceived from the outset to ensure that the two-channel brigade had nothing to moan about, and that bare front panel is the key.
If you think back to the earliest top-loading CD players, was is not merely sleight-of-hand to remind analoguistas of their beloved turntables with top-opening dustcovers? If this sounds like psychological trickery far too subtle for the audio industry, then you're probably right - hi-fi prefers to use a tactical nuke to kill a fly - but that's the take I get from it, and the Primare didn't disappoint. It just may be the easiest-on-the-ears separate A/V processor around. But if you can kid yourself, too, that it's a stereo pre-amp, so much the better if you're the sort who has 'issues' with multi-channel. In which case, why have you read this far?
But the Swedes are thinking of people just like you. Primare's stated dictum is that '...the SP31.7 disproves the idea that exceptional stereo performance from analogue sources must be compromised by the inclusion of digital processing and video circuitry. The SP31.7 is designed as two totally separate units mounted in one case: a fully-balanced pure analogue stereo preamplifier, and, via independent power supplies, a high quality 7.1 channel Dolby Digital & DTS processor with full video switching.'
To reach a goal of ensuring that analogue stereo can live side-by-side with home theatre - achieved by many others, but still with huge, cluttered boxes - Bladeleus included details such as balanced output for the stereo channels, a proper bypass mode to avoid the processing and independently adjustable crossover points and output levels for every speaker in every surround format. Thus, each mode can be optimised, say, to allow the user to operate the front channels in absolutely full-range fashion when listening to pure music, and then switch the same primary channels to a 60Hz crossover point for Dolby Digital and an 80Hz crossover for DTS.
And be not deceived by dimensions of a mere 430x385x100mm (WDH). The Primare will still handle more components than even the saddest of videophiles can imagine; thoughtfully, you can configure the rotary so it only scrolls through those that are in use. In my case, I had it set up for satellite/TV (Sky), analogue VCR (Sony), DVD player (Rotel RDV-1080), direct CD (from the Rotel, and the Sony '333 SACD player) and LaserDisc (Pioneer DV919L). Thus, I was unaware during day-to-day use that the Primare accommodates a mighty
Although the front only shows you control of source select and volume via rotaries, and buttons to choose menu, select, level and standby, the back is filled to the edges with the following audio inputs: an XLR AES/EBU digital, five coaxial digital, two TOSlink digital optical, a pair of XLR balanced analogue, seven pairs of coaxial RCA analogue. Outputs? How about: one coaxial and one TOSlink digital output, a pair of XLR balanced analogue outputs for the main left and right stereo channels, and RCAs for all channels including a brace of subwoofers, and a pair for analogue record out.
Then there's the video: two for full component video, plus one for component output, three s-video in and two s-video out, four composite video in (via RCA) and one for main out and one for record. And, to ensure full compatibility with custom installations and multi-room, there are four programmable 12 volt triggers through optional interface), full RS232 and discrete IR control, a microphone input and remote output. The support for custom installation allows the processor to be controlled via a wide range of home automation touch screen controllers, e.g. Crestron, while the onboard triggers can allow control over partnering components or such video necessities as screens and blinds. (The unit comes with two remotes of differing complexity, Oh, I almost forgot: there's also an IEC input for the, er, mains.
Confession time: although I watched him do it, CSE's Adrian Blundell set up the Primare. Although not as daunting as the Lexicon, which comes with its own take on
Here's but a part of the litany of set-up parameters: assigning components to inputs, setting the displays, setting delays via speaker distance, setting speaker levels, adjusting bass management through speaker crossover settings from 30Hz-150Hz in 10Hz steps, assigning parameters to different sources, blanking off unused inputs, assigning default surround modes (e.g. you don't need DTS for TV playback), ad infinitum. Let's look at it another way. Adrian turned up and simply substituted the Primare for the Lexicon in an existing set-up,
As for the rest of the system, the Primare controlled the above-listed sources, a Theta Intrepid amplifier, two Martin Logan Ascents, Cinema centre channel, Descent subwoofer and Scenarios at the back. The screen was a Marantz FL4200 plasma, and the majority of the wiring came from Chord. So, I was auditioning the Primare and nothing else, in a system that had been unchanged for some months. The transformation was NOT subtle.
What quickly transpired was a familiar audio phenomenon: the Lexicon and the Primare are so different that it made it more difficult rather than easier to assess the changes. Yes, I know that the Lexicon isn't to everyone's tastes; a colleagues whom I respect without reservation simply cannot get on with it, finding it sterile and hearing the sound sliced-up into five channels. He uses dynamic speakers, I use dipole ESLs, so we agree to disagree, relative to our own system conditions. Conversely, the MC-12 gave me a delicious 360 degree surround, but will admit to a hint of uber-clarity that some may find the be the very element that makes multi-channel a no-no. We are not talking 300Bs and vinyl here.
But the Primare? It's soft and sweet and lush, all-enveloping with the efficacy of the Lexicon, but with far less concern for minuscule detail than it is for overall consistency and 'musicality'. I seem to recall years ago defending my love for valves by saying that I preferred a glorious lie to distasteful truth - my way of saying that sonic accuracy isn't the be-all, end-all - and the Primare errs on the side of music. Call it 'sonic air-brushing', the reason why the latest 16-year-old starlet is zit-free on the cover of a colour supplement. I can live with it.
Let's deal with the video switching first. Perhaps a 42in plasma isn't enough to make this revelation worrisome, but there was a barely perceptible drop in absolute visual clarity. To detect this, you needed shots like close-ups of actors' chins, if counting stubble is your arbiter. It was enough, though, to minimise some of the benefit of SuperBit discs. Would it be exacerbated by a full-blown projector and a 15ft screen? Probably. But I was at no time concerned with the change. I'd seen far greater variance between DVD players, e.g. the Rotel vs the Pioneer. Suffice it to say, videophiles will not be dissatisfied with the switching. Then again, the most sophisticated systems would not channel the video signals through the processor anyway, but rely instead on the installer to feed the video directly to the projector or screen, with the switching accomplished by the remote control.
So back to the sound.
Like many videophiles, I now have - after five years - a fairly healthy library from which to choose. And certain 'winners' have emerged in the sound stakes. Eric Clapton's
Inject dose of schizophrenia here: the Primare is so, so
Put it another way: I was able to watch three episodes in a row of
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