What are your dream speakers?

Oh you know what my answer will be! If ever I could! ;)

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JBL 4330 / 4335 and their various more recent "K2" or "Everest" type speakers (I forget all the model numbers)
Altec 604
Altec Model 19
JBL L300
JBL L212
JBL L150

... and many others. :D
 
Is the bass driver an 18, 15 or 12? Or lower? They're not my type of speaker. But I'm sure they sound fabulous.

Sound fabulous? I'm sure of that, but this is as close as I, you or 99% of the rest of this board will come! Enjoy the write up! :thmbsp:

KEF Maidstone R109
by Chris Binns

When a company with a track record such as KEFs decides to launch a flagship i.e. the culmination of everything that they know about loudspeaker design, the very least we should do is sit up and take notice.

Development of the Maidstone began in the Autumn of 1995. KEF had already established some reasonably large and well regarded designs, such as the Reference four, but the company had produced nothing suitable for the world arena of high end heavyweight loudspeaker design. By contrast, container loads of large, esoteric loudspeakers were being shipped from the United States. To successfully compete in this market KEF needed to produce a loudspeaker to satisfy an extremely demanding list of criteria. The new unit would have to have a massive dynamic range, wide band width, low coloration, good imaging and overall musical quality plus the capability to deliver high (read realistic) volume levels, with minimum compression and distortion, in a large room. The design team could take some consolation from the fact that physical size and budget constraints did not appear to be too severe. Confronted with this challenge the engineers decided to start with a clean slate. It was not a case of pressing into service existing components designed for other systems. Every part of the Maidstone was drawn up with the final product in mind. Strangely enough, the design solution exhibits a return to more traditional values. With the exception of the Uni-Q, it appears that KEF has omitted many of the other innovations for which it is famous.

The Maidstone, once fully assembled, is large and very heavy. Each of the speakers arrives in two sections, and even in this state it takes two people and a lot of sweat to unpack, move and install them. If you don't believe me yet, maybe you will when I tell you that the complete cabinet is approximately 4ft high by 2ft wide with similar depth and weighs in at around 200lbs, or nearly 90Kgs. The weak hearted or spinally impaired should take notice of these facts and approach installation with some caution.

Each assembled cabinet comprises a bass bin, an upper bass cabinet and the mid I top box. The substantially braced bass bin has an internal volume of a 145 litres and is reflex loaded by two ports, each 100mm diameter and 420mm long, flared to avoid turbulence. KEF supplied a spare bass drive unit - not I might add because there was any likelihood of one failing but because they are proud of it. And so they should be. This is not just another 15" bass unit; it is one of the most beautifully engineered devices I have ever seen. Technically it is something of a masterpiece, incorporating a short (10mm) voice coil immersed in a long magnetic gap. This provides lower distortion and greater stability than the more conventional motor structure which utilises a long coil and short gap. The adopted approach is a lot more expensive to produce, primarily due to the cost of engineering the massive magnet assembly needed to generate and focus the flux evenly. The cone is a slightly flared, bonded pulp structure, terminated in a synthetic rubber suspension and complimented by a double rear spider assembly again aiding stability. This unit covers the bottom end of the frequency spectrum up to about 100Hz.

The two upper sections of the cabinet sit on the bass cabinet, coupled to it by 3 gold plated cup and cone assemblies. The lower of these contains a 10" drive unit built along the same extravagant lines as its big brother i.e. over engineered and dead gorgeous. The internal volume behind this upper bass unit is 14 litres and it works in the range from 100Hz to 400Hz. It also marks the Maidstone's first divergence from conventional practice. A lot of full range speakers step straight from a very large bass driver to a very small midrange unit, which can cause problems with the integration of the units, and the continuity of the bass. KEF have stepped the drivers far more gradually going 15" -10" -6.5". This, and the fact that they all employ the same doping, should produce musically far more coherent results, from the deep bass right up into the low treble. Or so say KEF and it has to be admitted that this is one of the R109's great strengths.

The top enclosure is bolted, via (gold plated) spacers, to the upper bass cabinet which contains a 6.5" Uni-Q driver handling (almost) the rest of the frequency range. The chassis of this unit, like the others, is a high quality die-casting finished to an excellent standard. For those of you who haven't encountered this KEF innovation, the Uni-Q driver demands closer investigation. Their design features a highly developed tweeter situated within the coil assembly of the mid-unit, thus approaching the ideal of a 'single point source' delivering a well behaved dispersion pattern with good phase characteristics off axis - or so we are told.

The overall look of the Maidstone strikes me as something that started out as an ugly functional object, before being tamed to make it more aesthetically acceptable. The 25mm thick (50mm in the bass unit) front baffles are curved in an easy going fashion and veneered in handsome grain matched mahogany whilst the back, top and sides of the cabinets are finished in a satin black. KEF have lavishly adorned the Maidstone's by gold plating virtually all the exposed metal parts. This extravagance is not too much in evidence until you see the back of the units which boast beautifully finished terminal plates and binding posts. There is also what might be mistaken for a nameplate on the top of the mid/HF box. Its true function is to facilitate the addition of a super tweeter, not something commonly encountered in this part of the world except by the RSPCA, but apparently becoming a trend in the far east. One wasn't supplied and I certainly didn't miss it.

The terminal plates are situated on the back and top of the bass cabinet, the former providing input to the crossovers, the latter, output to the mid and top drivers. This adds up to a staggering twenty binding posts per loudspeaker (all gold plated...). With this glut of connections available, various configurations for set-up present themselves. Everything from single wiring (using supplied gold jumpers) through to full 4-way active drive can be accomplished. KEF advocate an approach which lies somewhere in between. They recommend passive bi-amplification, for which, as we'll see, they have good reason.

Below the terminal boards lie the crossovers. One unit serves the two bass sections, the other the mid and high frequencies. Once again, high build quality is evident and KEF's matching of crossover components and drive units is second to none. This usually pays dividends with imaging and presentation of detail. A small amount (± 1 dB) of level adjustment is available for the high frequency energy level, via a screw terminal, to compensate for different acoustic environments (and of course it too is gold plated).

The mid-range cone material is doped polypropylene with a gentle curve whilst the tweeter is a 1" fabric dome, ferrofluid cooled within a neodymium magnet assembly. One minor reservation about the crossover layout. I might be out of line here, but it seems to me that in a speaker of this quality particularly bearing in mind the unused space behind the top section of the cabinet, that there would be advantages in externally mounting the cross-over? If there is any evidence of electronic components being microphonic (and I firmly believe that there is) surely the last place you would want to situate them is inside a bass cabinet - especially one generating the volume levels of which the Maidstone's are capable.

In spite of their size, the KEF's are not especially sensitive: 91dB is specified, along with a 4-ohm load. KEF's Conjugate Load Matching is not in evidence here - a lot of their earlier models incorporated circuitry to ease the load on the amplifier and thus make them easier to drive. Ironically I think we can safely say that the Maidstone is something of a power hungry monster, and the preference for bi-amping is understandable.
 
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Part II cause we're limited around here! :thmbsp:

The system I used with the big KEF's comprised the Meridian 508.24 for CD replay and the Linn for vinyl. These were coupled with the Pass Labs phono stage, Primary line stage and mono blocks, which rose to the occasion admirably. It is rare that I'm able to safely unleash over 300 watts into any loudspeaker but it was clear that the Maidstone's were having a good time with them. Connections were made with Chord Company Chorus and Odyssey which did sterling service. Towards the end of the listening, and feeling the demand to try something a little more exotic (and in keeping with a twelve grand speaker) I prised a set of the ruinously expensive Nordost SPM from the editor's sticky grasp. And yes, it made a big difference, building on the already impressive performance.

The Maidstone's need plenty of space around them which was no problem fore and aft but unfortunately in my room I could not quite give them the clearance they deserved to the sides. They constantly reminded me of the fact, so be warned, you will need a lot of space.

The first thing you notice about the sound of the Maidstone's is the sheer, enormous scale that they present. There is an impact to music that a good large speaker can provide by way of a combination of dynamics, bandwidth and effortlessness that can be totally addictive. The Maidstone's are good. There is a sure footedness to their presentation that instils a confidence not available from lesser designs. To be more specific, the Maidstone puts all the fundamentals in the right place, and at the right time, with such authority that all other aspects of the performance fall into place.

Rhythmically complex music, such as Peter Gabriel's soundtrack to The Last Temptation of Christ is conveyed in a fashion that leaves no doubt as to who is in control. The drummers, all twenty of them! As the music builds up, and each successive layer of percussion is added, there has been a sense of doubt with many systems that they might lose the plot or even their bass units when things start getting frantic. Not so with the Maidstone's. I have never heard a speaker remain so totally in control with this music, even at really frightening levels. They manage to pass it off with a slight sense of arrogance as in "is that the best that you can do?" No problem. There is something about the combination of the two bass units that gives music of this sort both the weight and agility which makes it so exciting. In my experience a single large bass driver cannot successfully deliver both of these qualities. Likewise, large scale orchestral works such as Brahms' Symphony Nos. 3&4' are beautifully reproduced, again with that sensation of immense scale countered with poise, and where called for, drama. It was impossible for me to listen to just one movement, I had to play the whole thing through. By contrast, small scale recordings such as the Shostakovitch string quartets (all of them!) were reproduced with an intimacy that was enthralling, combined with a lush but accurate string tone, built on the resonant presence of the instrumental bodies. Although there was plenty of depth, the Maidstone's found it difficult to define a convincing lateral image of the instruments, resulting in a lack of precision across the soundstage.

Traditionally the Uni-Q drivers have excelled at image definition, to the extent that it wasn't essential to be square in the middle of the loudspeakers. This is where I suspect that the width of the room was upsetting the situation but unfortunately I didn't have the opportunity to try them in a wider one. Besides, moving them would have been a nightmare! I have heard them produce lateral images (although not of the exaggerated, pinpoint variety so fashionable at present), so this will have to remain a 'listen to them in your own room' judgement.

A session which remains highlighted in my memory of these loud-speakers occurred late one night, listening to the Naxos recording of Arvo Part; Fratres. This eerie music has a quiet, pensive beginning which grows to a thunderous dynamic crescendo before dying down again, all within the first movement. It is intensely emotional stuff, and I was left enthralled and not a little scared, particularly as I was in the house alone.

As you will probably gather, I was enjoying myself. I had to force myself to explore some of the other possibilities using ancillary equipment that I had on hand, because every time I went into the room I just wanted to listen to more music. I did get round to bi-amping the Maidstone's with two Naim NAP 250's, and this proved to be a good match, sounding a little tidier and more controlled, although lacking the drama and sense of scale that the Primary valve amps could generate. The attributes of the Naim amplification shone through, with good rhythmic delivery and timing. I began to wonder what four NAP 135's would sound like... but there just wasn't time, and by this stage I felt as if I already had a good feel for the KEF's capabilities.

There is no doubt that the Maidstones are remarkable. Like any esoteric product, they demand skill and patience in setting up, and the choice of suitable amplification is certainly a limited one. Yet again we are confronted with a product that demands the agility and subtlety of a small amplifier combined with the sheer muscle and current drive of a much larger unit. Fortunately because they work so well with bi-amplification, this dichotomy is not the problem it might otherwise be. Similarly they are demanding of the room. These loudspeakers excel at presenting music on a large scale and in order to achieve their full potential they need plenty of space to breathe.

Have KEF met their design objectives? Yes, I believe they have. The Maidstone's did all the things that you would expect a large loudspeaker to do and with supreme confidence. Are they value for money? I just don't know. That depends on your particular outlook and circumstances, I know that I spent as much time as I possibly could listening to the Maidstone's, and when the time came for them to go I realised that there was going to be a considerable period of readjustment. I still miss them.

 
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Just a few!

JBL L-112
JBL-4212
JBL-4411
JBL-L-166
JBL-L220
JBL-4333A Studio Monitors
JBL-4343B-Studio Monitors
JBL-Synthesis Everst 6000-Added Pic.
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KLH-5's
AR3a's
 
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I really don't know anything about the high end market, so I'm just going to kick back and enjoy the show. Carry on gentlemen.

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I'll take her and a pair of these (Bozak Symphonies). They'd be the logical progression from what I have now. Same type of sound-signature.
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Until then, I'll have to settle for what's in my avatar (I love settling).
 
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I always wanted a pair of JBL L300's or Infinity QLS.
But I'd like a Mountain cabin on a lake,too.
About the same odds of ending up with any of those.
 

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I think the KEF ones I enjoyed hearing the most back in 1985, were with the oval (more race-track shaped) passive radiators. I was visiting Atlantic Audio/Video in Hamilton, and they were demonstrating a H/K receiver and tape deck. The speakers had so much punch on the Shalamar track they were playing.
 
Probably my three favorite sets I've ever heard are the Sonus Faber Guarneri, the B&W Silver Signatures and the Aerial 10ts. (LOTS of reasonably-priced second place contenders) but if you're giving them away, I'd take the Aerials. Not too extravagant at all. With the advent of the internet, it's amazing how many speakers I'd put in the very very good category are downright affordable. When I heard them, they were $7,000 plus stands. I've seen them for $2,000 including stands on two separate occasions.

I'd take the additional $25,000 cost most people will apply to get uber-high end speakers and dedicate a purpose-built room. As a contractor, I think I could build a 20x28 room on a solid slab foundation and run three dedicated lines for power for under that price.

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