Exploring Naim Power Amplifier Alternatives - Guest Contributor Clive

He's back!  After only a short gap, Clive is back with more insights into experiences with his system.  Opinions are Clive's own. Enjoy.

A couple of months ago I was speaking with John Jackson aka JJ about improving the amplification of my system without swapping my 2 x 250s for 4 x 135s - I didn't want to increase the box count. My 250s have already been upgraded with the addition of Avondale HCR200 power regulators & John's Phoenix amplifier boards, sound amazing & outperform standard 135s so I appreciated it might be a tall order... but read on.

 

For those of you who don't know him, JJ is ex Naim Senior Test & Service Engineer & was Witch Hat Lead R&D Engineer before their demise. He is now operating under his own name as JJSThatcham (https://www.jjsthatcham.uk/) offering Naim servicing & upgrades. When I put my question to him, he told me that there was a modification that's he'd been thinking about for a while but not got round to trying - did I want to be a guinea pig?

 

The modification involved taking a pair of his highly acclaimed Dragon Newts (which will elevate the performance of your Hicap or Supercap) tweaking them to produce +/-42 volts rather than +24 and using them to power a specific section of the Phoenix boards, which would benefit from these ultra-low noise power regulators.

 

So I took a deep breath, put my system back to passive & handed one of my amps over. The development had to overcome a couple of hurdles. The first build of the 42 volt Newts wasn't a quiet as John wanted, but a redesign solved that. Secondly a variation to ensure PSUs start up safely in all conditions caused another issue but that was soon resolved. And about ten days ago John called me to say my amp was ready for collection.

 

 

Those of you that don't know my system may be thinking that, when I mention Aktiv& 250s in the same breath, there'd be something like a 52/supercap/snaxo/ in front of the power amps, and in fact there used to be. But the clue is in "Aktiv" rather than active. Now at the front of my system is a Linn Klimax System Hub which is a streamer/pre amp followed by a Klimax Exaktbox Organic which performs DAC & digital crossover filter duties. I found that the Linn Aktiv implementation is a significant improvement over the Naim snaxo. My speakers are now Kudos 707s although until recently I had SL2s with bespoke crossover filters created by SpeakerFilters / http://speakerfilters.blogspot.com/

 

 

So how does it sound? I've initially left my system passive so I can easily compare to the existing amp. Straight out of the box it was obvious that the addition of the Dragon Newts had made improvements but now they've got 200 hours /10 days under their belt, I sat down do a serious comparison. I pulled up my Test Tracks playlist (link at the end) & chose five tracks. First up was Mary Coughlan - The Beach. It was immediately apparent from the open opening notes that the sax intro has more detail, more of a rasp to it. When Mary starts singing, the vocal has more air & is more breathy. The guitars are more distinct & more defined. Notes start & stop with more precision. But the overall impression is of a more musical, more real, more live performance.

 

Other tracks I listened too were Hanne Boel - After Midnight, ERA - The Mass, John Campbell - Way Down in the Hole & Nils Lofgren - Little On Up (you thought I was going to say Keith Don't Go didn't you). It was the same story. Snare drums have more snap, bass lines are tighter, there's more air round instruments, there's more vocal inflection & everything is easier to follow. On the ERA track the timpanis sound more - well more like timpanis& the track has more drive. The Nils Lofgren track while it's easier to separate the two guitars, the whole track is more poignant, you can feel the emotion.

 

 

 

To summarize, the modification retains all the PRaT that Naim amps are famed for and gives you more of the attributes you'd want - tighter bass lines, more precision, more decay on sustained notes, more shimmer & shine on symbols, airiness & separation, greater insight into vocals & individual instruments. However it manages to do this in a hugely musical & real, non HiFi sort of way. It sounds more like a live performance, be that in a controlled studio environment, on a stage or in your local pub. It sounds like the musicians are having just so much fun. Fantastic. Swapping back to the original amp (very briefly) & that sounded a bit dull & pedestrian by comparison, & bear in mind that this is an amp that out performs standard 135s.

 

I was now itching to have Dragon Newts fitted to my other amp so I can go back to AktivExakt.

 

Well a couple of weeks later I got my second 250 back from JJ with Dragon Newts fitted & put my system back to AktivExakt and gave it a couple of weeks for the second amp to burn in. I listened to the same playlist (links at the end) that I used in my initial assessment of with / without the Dragon Newts - so how does it sound?

 

 

Short answer - awesome. Longer answer - I have my amps configured so that, rather than one for bass/mid & one for tweeters, one powers left bass/mid & left tweeter & the other the right speaker drive unit. Linn's ExaktAktiv implantation brings a depth & precision to the sound stage and separation between performers that you just don't get in passive configuration.

 

In ExaktAktiv configuration, the Dragon Newt modification to the amps brings an extra level of airiness /breathiness & dynamics to the performance. On the first track the rasp & inflection on the sax was more obvious, more real. Bass lines gain in solidity & Mary Coughlan's voice is anchored centre stage - close your eyes & she could be in the room with you along with the saxophonist & bass player (although that makes it quite crowded in my lounge)

 

On the Era track you really get more of a feeling of a massed choir. There's a greater sense of menace with the  timpanis like rolling thunder, and the driving bass lines sound like something from an Indiana Jones movie when the bad men are lowering him into the pit of hell

 

John Campbell's  voice sounds even more gravelly if that's possible, ravaged by years of smoking cigars & drinking cheap whisky. And if Little On Up doesn’t bring a tear to your eye you must be made of tough old boot leather.

 

Going ExaktAktiv takes the attributes that I experienced after JJ had added Dragon Newts to my first amp - tighter bass lines, more precision, more decay on sustained notes, more shimmer & shine on symbols, airiness & separation, greater insight into vocals & individual instruments and builds on them. But importantly, it does so in a hugely musical & real, non HiFi sort of way. It sounds more musical, more real, more like a live performance in your living room. It sounds like the musicians are having just so much fun. Fantastic.

 

 

As a foot note, I've heard the new white logo Naim 250, and I know some people are raving about it. For me, that is hifi, amazingly detailed but ultimately not engaging. If you are looking for the PRaT that Naim are famed for, but in spades, get an Olive 250 & have JJ breathe his magic on it. And if you fancy going down the ExaktAktiv route, but have speakers that aren’t supported (I previously had Naim SBLs & the SL2s) contact SpeakerFilters:  http://speakerfilters.blogspot.com/

 

 

Test Tracks (subscriptions may be required to access these playlists)

https://open.qobuz.com/playlist/7693858

https://tidal.com/.../5822bbac-97fc-4471-83bf-d6e284571a13

 

Kudos Audio - Exclusive Factory Visit, August 2023

Now a very visible and significant player on the international high quality audio scene, Kudos Audio has taken a different approach to producing music for its enthusiastic customers and are actively pursuing new ideas, as I type.

Favourable reviews are now the norm for the company's Titan range, including a number on Audiophile Musings.  Step this way to get a flavour of what the reviewers are saying about the company's products and some of the numerous awards and accolades bestowed upon them:

HiFi Critic Titan 505 

The Ear Titan 606

HiFi+ Titan 707

HiFi+ Titan 808

Hifi Critic Super 20A

What Hifi? Super 10A 

Hifi Choice C10 

Audiophile Musings "Sound of the Show" (Titan 808) and "Highly Commended" (Titan 505) at Chester Show, 2019

Audiophile Musings "Sound of the Show" at Bristol 2020 with Titan 707

Audiophile Musings went to find out what makes the company tick, being invited for an exclusive factory tour in the North East of England, UK - it turned into a 5 hour history lesson, factory tour, Titan 808 listening session, and zero nonsense...

Most of you will be familiar with the old joke:

Tourist: "how do I get to Town X"

Local: "well, I wouldn't start from here if I was you..."

I came away with the impression that the Kudos story has a similar origin.  Derek Gilligan, founder and head honcho at Kudos has a solid background to work from with a family in the music and live music PA business, but the route from there to today took an interesting path. Today's Kudos is a testimony to thinking differently, building a team that incudes family & those you can trust, being obsessive about quality and ensuring the basics are right.

As a fellow Darlingtonian, it was easy to chat with Derek about the pros and cons of "Darlo" and the area in which we grew up.  Different schools though, so not totally parallel experiences. I very much remember my early forays into hifi in the 1980s and they were supported by some canny purchases from used audio specialists in High Northgate, Darlington "North East Audio Traders". Derek became part of the team there and may even have served me in the shop, but thankfully neither of us remember! North East Audio Traders was a novel idea in the region at the time and was reasonably successful. Going to hifi shows to demonstrate their equipment was part of the game, but speaker consistency proved a challenge. Hence the guys at N.E.A.T. put together a small standmount of their own to enable easy comparison between equipment that's just not possible when a stock of used speakers is constantly changing from day to day. Soon reviewers were asking to review the speaker in its very rudimentary form, but were very complementary about the way it performed. Derek was involved in the speaker using a renowed driver from earlier speaker products that needed to be sourced from wherever they were still available from stock. Eventually this driver had to be re-manufactured once the speaker took off in the market. It was partnered with a modern dome tweeter. The NEAT Petite is now a very well known speaker and continues in a revised form to this day, as the Petite Classic.

Original NEAT Petite Loudspeakers

The design process of Petite, based on listening for musicality and a try and re-try approach set the tone for the future. What Hifi? were impressed with the result "as tuneful as they come".  When demonstrating the speakers, N.E.A.T. used the exceptionally substantial Kudos speaker stands...

Derek parted ways with NEAT for a few years, pursuing other activities until he returned for a second stint with the company to work on speaker designs such as the Ultimatum, where we can see techniques such as isobaric bass loading being deployed, as it is in today's Titan range (also used elsewhere such as Linn's Akubarik). NEAT bought the Kudos brand as part of buying up the stock of speaker stands as Kudos' then owner moved on to different products and markets. During this time Derek had developed some design ideas he wanted to try but the opportunity wasn't presented to go in that direction.  Time for a new direction...

So we come to the inception of Kudos Audio as a speaker manufacturer in its own right - a "do or die", "all or nothing" decision for Derek and his wife.  With a good network of contacts in the industry and dealerships, understanding what was wanted in the market and what was possible from a design perspective, the initial Cardea products, although fairly conventional in construction, were very well received and the business was underway.  The basic tenets behind those early designs hold true today - listen, listen, listen, use high quality components, gentle slope crossovers to minimise component count and phase distortion, build in the UK using UK producers and components wherever possible. But the scale has moved on, as has the size and breadth of the product range.

Based in the North East of England (close to Derek's roots) isn't the UK hifi heartland, but everything is within easy reach and, of course, electronic communications mean distance isn't the blocker it used to be.  The company is split across 3 sites on the same compact business park - storage, manufacturing and design / demo buildings. This is the second location for the company and it has grown into the current arrangements organically - annexing a next door unit here, installing a mezzanine floor there, plus the major investment in the design / listening / demo suite. Its a compact, cleanly presented, logically laid out facility. This appears to work very well for the core workforce, consisting of Derek, production manager Mark with Derek's son Louis looking after quality control and his daughter Kay joining the team on the week of my visit to take on office management, accounting etc. after several years experience in similar roles in other companies. The extended team includes another 7 colleagues across sales, marketing and export colleagues based locally or where the dealer network needs them to be.

We talked through the design and manufacture of the higher, and very successful, Titan range of products to understand the Kudos approach.  Essentially Derek uses the experience of existing designs and applies new ideas to those products or completely new concepts to push the boundaries of what's possible and what's effective - sometimes it shows promise, sometimes it doesn't, sometimes it takes very little refinement to be just what he's hoping for.  The exact percentage of those outcomes wasn't shared with me :)  An example is using isobaric loading for the mid-bass drivers in Titan 505, 606 and 707. Basically isobaric means 2x drivers - one internal, the other on the front baffle - linked by a sealed air chamber between those drivers, giving the impression of a much larger single drive unit in a larger cabinet. Its unusual in the industry to use isobaric so high in the frequency range, but Kudos found that allowing a minimal air gap around the voicecoil of the driver, coupled with "back to back" driver mounting reduced the effect of differences between drive units (even very expensive drive units are never identical) to give a better performance over a wider frequency range.

Another example of experienced based innovation is the cabinet construction of Titan.  Its core is a relatively thin MDF structure, the panels of which flex (the deflection is not visible to the eye) because the outer panels of the cabinet, in heavier gauge veneered MDF, are compliantly coupled to damp the flex of the inner cabinet wall. A mix of 2 existing, usually mutually exclusive, philosophies in the industry, but applied in a different way. The composition of the damping disks connecting inner cabinet to outer cabinet and the exact location of the mounting points were subject to the iterative try, listen, change, listen, change, listen approach until the best sounding materials and mounting locations were established. A further example of the design approach is that each panel in the internal cabinet has one of a number of thickness options - to vary the natural resonance of each panel rather than having all the panels contributing one resonance.

Titan 606 Inner Cabinets and Connector / Crossover Panels

Kudos work very closely with Norwegian driver manufacturer SEAS who have been found to be exceptionally co-operative and collaborative on driver design changes - be that cone materials, coil winding, cone shape, doping etc. etc. Only the basic driver basket remains unchanged for mid-bass drivers, everything else is available to change and Kudos exploits that opportunity with drivers going through several iterations before being custom manufactured to their final spec.  The Krescendo tweeter used in Titan is another example of the collaboration with SEAS, being based on a existing metal dome driver but with the magnet from a different SEAS model and the dome using a fabric and shape of Kudos' choice. As a component, compared to those in many other loudspeakers, the Titan tweeter is "reassuringly expensive".

SEAS Mid-Bass Drivers to Kudos Custom Spec

 

We step through the build process.  Cabinets are, of course, Kudos designs, but built by specialist suppliers.  A subject of intense discussion in the UK speaker manufacturing industry right now as one of the major suppliers of cabinets to the vast majority of UK loudspeaker brands has abruptly ceased supply.  For a small company this means a great deal of disruption to source a new supplier, but this looks to be resolved for Kudos and supply will continue to be delivered to customers as there are good stocks of parts in place right now. Every cabinet (internal and external damping panels, stand components etc) are inspected for any imperfections before being accepted and placed into stock. With Titan the internal cabinet remains consistent and the external damping panels bring the differences in colours and veneers. A number of veneers are available as are piano black and white gloss.

Drive units come in from SEAS in batches, passive crossovers are constructed on the production benches. Crossovers for Titan are hand built on the connector panel with components being direct wired (no circuit board) and use very gentle crossover slopes and the natural roll-offs of the drivers in the cabinets as Kudos believe this reduces "stuff getting in the way of the music".  Its a relatively expensive way of making crossovers, but demonstrates the passion for getting the right end result.  All the components for a complete speaker pair - drivers, internal cabinet, external damping panels, crossover, stands, packaging, connector panels, etc, - are gathered together onto a single pallet.  This pallet is then transferred to the build area for assembly by one member of the team. Seeing the details of the drivers, and the layered construction of what look like relatively simple stands opens my eyes to how much effort has gone into the design of Titans, something not at all obvious to the customer. Every pair is then put through listening tests before being packaged ready for despatch. 

Alongside the build area is a newly constructed office unit and the basics needed to keep the team fed and watered through the day.

Titan 808 Crossovers - Bass on the Left, Mid and Treble on the Right

 

We move over to the design / listening / demo suite where, in typical Kudos fashion, we enjoy a straightforward sandwich and cuppa whilst listening to the system currently set up.  At this point we also discuss the "active" option for Super 10A, Super 20A and the Titan range, and why Kudos chose to go in that direction, another distinctive differentiator in the market. It is, unsurprisingly, a fairly simple answer - to get a better musical result.  As an independent manufacturer, with no ties to existing electronics partners, Kudos can work with multiple different active electronics partners with ease.  Linn, Naim, Exposure and Devialet options have been made available and the speakers can be converted to active operation with a simple change to links on the connection panel.  

Listening Room with Titan 808

Kudos have long been a favoured brand of speaker amongst Naim electronics customers and that manufacturer's kit has featured extensively during the development of Kudos products and demonstrations at hifi shows (in passive and active form), along with Linn's Exakt active option. But today we have a system fronted by an Innuos server / streamer, Chord DAVE DAC, Chord Ultima Pre and Ultima Power amps. This was a surprise choice for me, given my past experience with Chord amplification hasn't been so enjoyable.  But this new Ultima range changes that completely, being musical, with coherent timing.  This system was feeding Titan 808s passively through, of course, Kudos KS-1 speaker cables. We range through some church choral recordings (great representation of the space), electronic dance music (great pace, controlled impactful bass lines) and Leonard Cohen (expressive grumbling vocals) and the time passes very quickly enjoying the music (note, the music, not the treble nor bass nor mids!).

Chord Stack on the Left In Use for Our Demo - alongside Naim including the active SNAXO crossover option. Another rack in the room contained other manufacturer electronics including Linn, currently being refreshed to Selekt spec.

What of the future?  Well Kudos have lots more ideas to take through their iterative, listening based process of product innovation and improvement. Some interesting ideas on drive units and active options could be on the way if they meet that essential criteria - is it musically more enjoyable than what went before? If today's products are anything to go by, the results will be interesting indeed.

Thanks very much to Derek and the Kudos team for your time, openess, straightforward discussion and hospitality.

Bristol Hifi Show 2020 - Sound of the Show Award - Kudos Audio (with Naim)

A new product and a new approach from Kudos this year at the Bristol show.  Fittingly highlighted in green in keeping with the Naim electronics, Kudos brought their Titan 707 for us to enjoy.

As is now the norm for Kudos show demos, the Titans were running active. Sometimes its Linn Exakt, sometimes Devialet Pro but more often its Naim with the SNAXO active crossover dedicated to the Kudos range. But this time there was a twist.  Normally we would see Streamer to Pre-Amp to SNAXO to power amps to speakers.  But Kudos have spotted an interesting opportunity in the way that Naim cabling works.  They presented a system here that used an NDX2 streamer, a SuperNait 3 integrated amplifier and a 250DR power amplifier. I'm not quite au fait with the way that this is strung together, but its suffice to say that its possible to split out the pre and power sections of the SuperNait so that it acts as a full range pre-amp but the power amp is only looking after, for example, the bass output (as it was here) from the SNAXO whilst the 250DR gets on with looking after the treble drivers.

This is pretty significant as it reduces the cost of entry to an active system and brings SN3 owners into the equation in terms of upgrading to active - they no longer have to move on from the SN3 to a new pre-amp and 2 new power amps - adding the SNAXO and one more amp is enough - and that could even be a used 180 or 200 to keep the costs down further.

Music was coming from the local Innuos Zenith server or from the Tidal streaming service.

Enough of that - how did it sound?  Well, great. Very very easy to sit and listen to all sorts of genres - which of course Kudos were confident enough to deliver.  The audience being encouraged to request tracks too.  All of this musicality meant that it was often difficult to get into the room as many visitors will have been happy to absorb the tunes for longer than in other rooms. Sitting in the front row made the system sound a touch light and in the second row a touch boomy so clearly this was a room effect and the best seat would've been midway between the 2 rows. Its difficult to write much more about this system, it just got on with delivering the music without any obvious issues nor with any outstanding areas - other than the outstandingness of its total confidence in delivering the goods.

For those of you who are Naim cabling aficionados, you might be able to work out the signal from SuperNait 3 to the SN3's HiCap PSU to the SNAXO and its HiCap PSU and then to the SN3's Power Amp section and the 250DR Power Amp. For those of us who are mere mortals, just be sure that it works and that someone else could probably get it to work for us!

Newly (quietly) announced at the show from Kudos is their own brand of speaker cables.  They're 18 strand silver plated copper and derive directly from the cables chosen by Kudos for the inside of their products.  No news on price at this point.

So, sound of the show for Kudos this year, and an honourable mention in the "music of the show" category too - a good variety being played and the audience being asked if there was anything they'd like to hear - the way the music should be at shows.

Kudos and Exposure Collaborate on Active Crossovers

Its a long saga...

Kudos have been enthusiastic about active electronics to drive their "Super" and "Titan" range speakers for around 3 years.  There are Linn Exakt digital crossover configurations for their speakers and a Devialet option too.

In parallel, a project was underway to develop a Naim SNAXO active crossover too.  It rumbled on for a couple of years, with previews at a number of shows that proved the solution to be a good idea.  it would, of course, have encouraged existing Naim amplifier owners to not only buy a SNAXO, but also to buy extra amplifiers.  You'd think that Naim would be keen on that.  But, for whatever reason, Naim have chosen to shelve the project for the foreseeable future.  There are some Naim dealers that will modify existing SNAXOs for Kudos use, but that's not exactly mainstream.

But now the news, for non-Linn and non-Devialet users, is much better.  Kudos and Exposure have announced a collaboration to produce an active crossover for Kudos speakers.  This will be a stand-alone unit that will allow the customer to choose any pre-amp and any power amp combination.  Excellent. I look forward to hearing the prototype at the 2019 Bristol Hifi Show.

https://www.stereonet.co.uk/news/exposure-launch-xm-cd-player-and-preview-vxn-crossover