Project – Nathan’s Jordan Eikona DCR loudspeaker

EJ Jordan Designs has a long history of selling direct to hi-fi enthusiasts, going back to when the company was founded by Ted and Denise Jordan in 1976. One of the pleasures is the interaction with customers, from answering questions to assisting with advice for whichever loudspeaker project they are undertaking. And at the end, we hope, there is the satisfaction of reading customers’ impressions of the final result.

Nathan, in the USA, embarked on building a pair of Eikona DCR loudspeakers almost a year ago. He and his brother Paul (who was handling the woodwork) were determined to produce something very high grade and in the course of their build had a number of interesting questions. (Always useful to us here at EJJ because it makes us think again about how we put the information across on the website.)

Earlier this month, we were gratified to receive an enthusiastic email from Nathan which read:

“These speakers are amazing! Super clean! Accurate!!!! Super good bass as well. Thank you for all your help”

We couldn’t resist asking for photographs and more details:

“Being an ‘Old Rocker’ at heart, the DCR build has completely quenched my thirst for a pair of speakers that can be played at high volume levels in my living space without breaking apart.

“With super tight controlled bass to spectacular crisp highs, they sit proudly in their new living space. The sound stage is wide and the separation of each instrument and note is spectacular. From soft vocals and small instrumental pieces, to heart pounding complexed electronica, these babies push out ear candy that keeps you wanting to hear more. I am so happy to be washed away with sweet high notes and no harsh ripple or static to my ears. I can hear fine details in music that makes me grin from ear to ear. Slight nuances of the breath on horns and fingers on strings, also small background voices that come to new life having been absent or unnoticeable on other speaker systems.

“I wanted a professional finished grade build to accommodate the fabulous sound they produce.

“I thought they should sit a little higher than the actual plans, so I constructed a unique foot for them to stand on that accentuates the dual speaker boxes by using two round pieces that separate the foot, which I think looks quite lovely.

“What a fun build, and what amazing speakers! Thank you for helping make this new addition part of my love for music.”

You can find the Eikona DCR, among other plans, on our Loudspeaker Plans page. And please remember that if you are embarking on a build, we are happy to answer any questions and always interested in photographs of the final result.

Vintage Hi-Fi Receivers

Whilst digital audio broadcasting (DAB) and internet radio continue to spread into homes, there is no denying the allure of the classic FM stereo tuners and hi-fi receivers from the 1960s onwards. The best of them featured polished woodwork, brushed aluminium front panels, tactile controls and the attractive blue glow of the tuning dial. They also weighed a ton!

If, like us, you feel drawn towards this kind of retro, there is a website just for you.

Classic Receivers is a blog devoted to vintage hi-fi receivers from the 1970s and 80s. It is based in the USA so the emphasis tends to be on classic Japanese receivers such as Marantz, Pioneer and Yamaha, but there is still a lot of interest for enthusiasts in Europe.

The list of models is extensive and it is being added to all the time. There are comments about performance, from both the technical and subjective viewpoints, and examples of current second-hand values. It’s a fun and useful resource.

Those of us in Europe might like to see more representation from this side of the pond. For example, classics from Norwegian specialists Tandberg, Swiss open-reel manufacturers Revox and, of course, Denmark’s Bang and Olufsen.

Vintage hi-fi is becoming very collectable (as we have seen from the prices fetched by Ted Jordan’s earlier loudspeakers from Jordan-Watts) and receivers are gaining an increasing following. Steve Guttenberg wrote about it a few years ago on the CNET site and here’s a comparison (wrongly linked in the article above) of a mid-1980s Pioneer receiver pitched against a modern AV receiver: You can guess which one wins …

So, is this something to be taken seriously? And which vintage hi-fi receiver would you buy?

Project – Pentagonal Eikona loudspeaker

Simon Regan’s beautifully-crafted Eikona VTL speakers featured on our blog a few months ago so we were intrigued to see his latest creations. These are a pair of unusually-shaped, floor-standing loudspeakers, based on one of our Eikona MLTL (mass-loaded transmission line) designs. The cabinets have a pentagonal cross-section, designed to reduce internal resonances, and were commissioned by a customer after reading about Simon on our blog.

Simon’s client, George Foster, belongs to the London Live DIY HiFi Circle. He has a history of using Jordan units, having built one of the original Jordan JX92 MLTL designs, and he felt it was a logical next step to try something similar with the Eikona 2.

George experimented with pentagonal cross-section cabinets after hearing the well-known Pentachord speakers in the 1990s. He became convinced that reflective surfaces within enclosures were worth avoiding (something we have achieved with the Eikona Triangular Array).

George says:

“I began with a single Eikona in the 35MLTL enclosure and then added a second driver, in the manner of the DCR. It made an enormous difference – I was surprised at how much fuller the sound became. The next step was to keep the same height but double the volume to 70 litres. Simon and I worked together on the plans, and he showed my wife and I a wide range of veneers. The resulting cabinets are of a much higher quality than my old ones – they look and sound very much better, and our choice of veneer fits beautifully with our living room.

“I was surprised at how much difference Simon’s cabinets made to the sound. I listen to a lot of acoustic modern jazz on vinyl and I have been particularly noticing the improvement in piano sound. The larger cabinets also give an impression of ease – the music seems to float out of them in a way which reminds me of open-baffle designs.”

Simon adds:

”Initially, George wanted me to veneer his existing birch ply cabinets. For various reasons, I suggested that it would be better to make new cabinets. I was convinced that by the time I had worked on the existing cabinets (eg re-machining driver cut-outs and rebating the Eikona 2s), I could have made new ones. I also recommended having veneer on both sides of the board (inside and out) as it balances the wood and avoids warping in centrally-heated homes. George agreed and I was keen to make these look as good as they would sound.

“George and his wife chose birdseye maple veneer, which I selected from Capital Crispin Veneer in East London. Buying it in leaves or strips allowed me to book-match the veneer consistently around the two cabinets. (This is a technique of creating patterns by using two sheets in mirror image to each other like the pages of an open book.) On veneered work, I like to use solid lippings – strips of solid wood – especially on edges which need to be particularly robust or require rounding over. Solid birdseye maple is difficult to find, so I made a trip to Timberline in Tonbridge, a specialist timber yard often used by lute and furniture makers. One thing to note is that birdseye maple can be a challenge to work with since you have to take great care with unpredictable grain direction.

“Apart from the ports, I made sure the cabinets would be completely airtight and very rigid. Inside are a series of pentagonal braces each cut from a single piece of board, then hollowed out and tongue-and-grooved into the sides of the cabinets. Once glued, these added great rigidity and were also helpful when it came to assembly, where I wrapped the cabinet walls around the braces. I used an aerolite glue, which allows the longest time possible to assemble, adjust and clean up the cabinets before the glue sets.

“Prior to gluing, I covered about 70% of the interior of the cabinets in Dedsheet material from Sound Service. As well as adding damping to the cabinet, it added a considerable amount of weight! I attached fine netting to the brace immediately beneath the bottom driver to stop the stuffing (long-haired sheep’s wool) from falling into the lower half of the cabinets. I finished the cabinets in three coats of a clear polyurethane lacquer.  A clear satin finish really looks great on birdseye maple and brings out the detail of the grain.

“It was great to work with George on this project and to hear how and why he came up with the design. It was very satisfying to hear the substantially improved sound and to be part of the process producing this pair of speaker cabinets.”

Simon is happy to work on other Eikona-based loudspeaker commissions. To see more of his work and to contact him direct, visit his website.

Surrounded! BBC Proms 2018

 

The BBC Proms 2018 season is now well underway and the First Night, on 13 July, featured a splendid version of Holst’s The Planets, with more fabulous music to come.

As in previous years, the BBC are using the Proms to showcase their latest sound technology. Of the most interest from an audiophile point of view is a 4.0 channel surround feed. This is only available online and provides a 320 kbps feed in 4-channel surround, at higher quality than the BBC’s FM, Freeview and DAB broadcasts.

We have tried the BBC’s Proms Surround in previous seasons, using a pair of Jordan Aurora 800s for front channels and Eikona Reflex 7s for the rear, and we can thoroughly recommend it.

The broadcast is accessed via a desktop computer or laptop, using a browser (Chrome, Safari or Windows Edge but not Firefox or Opera) and sent via HDMI to a multi-channel AV receiver. We used a Marantz 5-channel receiver and despite the modest amplification, the sound quality was stunningly good. The surround effect was particularly striking during the interval when the surround sound microphone remained live, giving a tremendous sense of the atmosphere in the Albert Hall.

The unbeatable coherence of the Jordan full-range approach helps enormously, with no phase anomalies to reduce the quality of the listening experience.

The BBC are also experimenting with binaural again this year. The Holst Planets is already available here and is an exciting experience over headphones. As usual, the Beeb’s website is rather a mess of out-of-date information, but you can find out more about the surround experiment here and binaural here.

Incidentally, the BBC has launched a new Sounds App, which will eventually replace the Radio iPlayer. You can find it here, but be warned that it’s still in the early stages of development.

 

Proms Offer

To celebrate the Proms, we have a Special Offer price on the Jordan Eikona drive units throughout August. You can read about it here.

As ever, if you are building a system with Jordan Eikona drive units, feel free to contact us for help and advice.

Enjoy the Proms, have a wonderfully musical August and sign up to our newsletter to follow the latest developments at EJ Jordan Designs.

A Tale of Two Customers

In a recent blog, we wrote about the Jordan Eikona DCR loudspeakers built by Ian, from the LencoHeaven forum. Ian was very pleased with the results and a visitor, Mark Manwaring-White of Malvern Audio Research, commented:

I walked in not having seen photos or anything and had quite a shock. First question I asked myself, how on earth do these work? Answer… quite staggeringly well actually!

In an email to us later, Mark added:

I was most impressed. Bang for buck they win against many speakers I could name.”

Ian is now going a stage further and constructing a full Jordan Array. This left his DCR enclosures in need of a new home. By coincidence, another customer had just bought two pairs of Eikonas with the intention of building DCRs. Claiming that his woodworking skills were limited to making a garden dibber in 1968, Phil looked a potential candidate for Ian’s enclosures, so we put our two customers in touch.

Phil was delighted:

I’m one very happy man … Ian turned up yesterday, a very hot Sunday (quite normal for Wales) and within minutes we were loving the music. The quality of the sound did not disappoint! Plus they brighten up the normally dark end of the room and we have more space. Absolutely love them! They are magical! “

He later added:

“My first week with these speakers was amazing, love everything about them. They have brought my music collection to life! Absolutely brilliant!

“Many thanks to Ian at Lenco Heaven who built the cabinets and kindly fitted the speakers.
Very grateful to EJ Jordan for putting me in touch with Ian and offering a positive solution to my lack of woodworking skills..

You can see the DCRs in their new home in the accompanying photos.

This was a very happy outcome and it highlights the level of service we aim to offer at EJ Jordan Designs. When you buy Eikonas from us and embark on a project, we want you to achieve great results. We support our customers with advice and we’re pleased to receive feedback and photos of the finished results.

Ted Jordan spent his life perfecting his loudspeakers. We are proud to continue his work and love hearing how his creations bring music to people’s ears.

PS Phil claims he and his wife chose the curtains to match the Eikonas. We’re not entirely sure if we believe him …

SME acquires Garrard turntable brand

Garrard is one of the most respected brands from the early days of British hi-fi. Many hi-fi enthusiasts began their journey with the Garrard SP25 auto-changer before moving up the Garrard product line to higher end products such as the 301 or 401.
The Garrard 301 and 401 turntables were true transcription quality, capable of outstanding performance at a range of speeds, including 78rpm (the 301 was launched in 1952 when the vinyl LP format was only four years old). These decks came without tonearms and were usually paired with an SME3009 or 3012 tonearm for best results. So it is particularly satisfying that at the beginning of this month, the Garrard brand was acquired by SME from Brazilian company, IGB Gradient.
Along with this acquisition was the purchase of Loricraft Audio, the Garrard tuning and repair specialist. For a fascinating history of the Garrard company, visit the Loricraft page here.
 
For further details see the SME press release.

Project – Eikona Horn Loudspeaker

We recently received photographs of an extraordinary enclosure for the Jordan Eikona 2, sent to us by Bruce at Ars Harmonia, our USA distributor. Along with them came an enthusiastic description by Paul, the constructor:

“The Eikona 2s are an improvement over the JX92S, more open, cleaner and warmer sounding. The highs are just great and they lack the breakup that made the JX92S overly aggressive on some music. Of course the bass kicks butt. I ran them for a week in their boxes before installing to break them in, time will tell if they will continue to break in with use. One of my worries was their efficiency, I can tell no difference in efficiency and the JX92S. I’m driving them with a class A amp (DIY Pass Sony VFET) with power to spare. I’ve attached a few pics that you can use and send to EJJ. After a week or so of listening I’ll post my impressions over on the DIYAUDIO fullrange forum, as there was a bit of interest about these drivers.”

This got us intrigued and we had to know more. Paul kindly offered to write up his thinking behind the enclosure and his construction method. A point to note is how clearly Paul set out his aims with this project, before even beginning the computer simulations, let alone starting to build.

Note that the plan shown is a sketch and is all we have. A higher resolution is available from us (email for a copy). Click on any of the images for a larger version.

Over to Paul:

 

Quite a while ago I started building my own speakers using readily available designs, I made a few sets of two and three ways which turned out really well, and eventually began experimenting with full-range speakers. As luck would have it just around this time Martin J King had just made the first versions of his famous Mathcad spreadsheets available to the public. I decided that I would try and build a set of horn speakers since I had heard so much hype about them. I ran about a million simulations with Martin’s spreadsheets, and what I found was that a straight horn modelled much better than an exponential, or hyperbolic horn, and that a large chamber for the speaker really improved the response. I used the specs for the Jordan JX92S for my sims.

My criteria were: A decent off-axis response, true full-range frequency response, not too humongous in size, and it had to be built using hand tools because that is all I had. I wanted the horn to expand along two axis, not just one as in most of the horn designs that I’d seen. I added a diffraction ring made out of solid maple to help with diffraction effects, to move the driver closer to the horn mouth, and because it looked cool. The driver is set 38” off the floor which is about my ear height when seated. I also wanted a front facing mouth that would couple with the floor to make the room part of the horn. I lined the inside of the horn mouth with carpet that looked like felt, and braced it with oak dowels to keep it from resonating.

Warning: this was a challenging build, much harder than a simple box.

With the JX92S I needed to stuff the upper part of the horn body with polyfill to tune the bass response, and I needed to add a baffle step filter. My filter ended up being a 1.5mH foil inductor with 6 ohm resistor bypassed by a 0.5 uF cap to help lift the upper end.

I used a compared a Radio Shack SPL meter and frequency response disk to measure the in-room response from my listening position, and repeated the same measurements using my 3-way speakers. (Sorry folks, that’s all I had at the time.) The response after tuning was very close to the 3-ways, flat and extended into the high frequencies. The in-room bass response was much deeper than the sims indicated; the early Mathcad models didn’t account for room effects. As a result, I measured output down into the 20’s. These speakers have deeper, more punchy bass than my 10” bass driver, 3-ways.

MOVING TO THE EIKONA 2

I lived with the JX92S in these horns and enjoyed them for 13 years, they are very impressive for such small drivers. But they did have their warts; the upper mids and lower treble can sound harsh on certain recordings and nothing that I tried over the years could change that. After hearing good things about the Eikona 2’s I decided to take a gamble and try a pair out in the horns. Their T&S parameters are pretty close. I dropped them right in with no adjustments. I’ve had a couple of months now to evaluate them and they are a worthy upgrade, better in every respect than the JX92S. They have greater detail, better bass response, smoother mid/upper end response, and gone is the harshness that the JX92S could show.

I’m driving the speakers with a 15 wpc class A amp with no problems, they get way louder than I can stand. They are the most transparent/holographic speakers that I have. My 3-ways ,although they sound great, seem veiled in comparison. All-in-all I am very impressed with the Eikona 2s. I don’t know how they sound in other enclosures, but they do sound great in these horns.

CONSTRUCTION

Here is the scale drawing that I used for the construction. One square on the graph paper equals ½”. Sorry that this is not the clearest, but it’s all I have. The horn throat is 2” x 2”, the mouth is 12” x 28 ½”, the horn path is 116” from the bottom of the mouth to throat. The horn is a linear expansion for most of its length and flares out only near the mouth.  The speaker chamber was optimized for the Jordan JX92S.

The sides were made using ½” plywood, curf cuts were used near the mouth where it flared out to help with flexibility. I carefully drew the layout on one side and cut it out with a hand-held saber saw, then used the cut out as a template for the remaining three sides.

Here is a close up shot of the curf cuts, I used a circular saw to cut them by hand. The curf cuts were filled with construction adhesive using a putty knife to add strength and deadening.

Here is a pic of the first layer of plywood being applied to form the horn body. Note the temporary spacer sticks used to control the expansion, they were removed once the first skin was on the front/back and the shape was stable.

Here is a pic of the completed horn bodies, I built the speaker chambers separately and attached them (sorry I don’t have any pics of that part). The sides have a ¼” sheet of underlayment laminated on using construction adhesive, the back is composed of 3 sheets of underlayment laminated together using construction adhesive. The front only has two layers of underlayment laminated because the tight curve was a challenge and the speaker chamber added extra support. The speaker chamber was made from ¾” plywood and was laminated to the front using construction adhesive and screws.   I added oak dowels to strengthen the mouth and keep it from resonating. The speaker chamber was treated like a bass reflex box and was lined with convoluted foam, and some polyfill was added in the final tuning process. The entire horn was veneered with birch, finished with a couple coats of linseed oil to bring out the grain, then a bunch of coats of wipe-on polyurethane was added on top for strength. I used some moulding to finish off the mouth edge to hide the plywood end grain and for a finished look. I used two rubber feet under the front of the mouth and one leg in the rear to stand the horns on the floor.

(Note that later I tried adding some tweeters to try to tame the aggressiveness of the JX92S in the upper mids/lower treble, they ended up sounding better without the tweeter.)

The Wam Hifi Show 2018

The Wam Hifi Show is billed as Europe’s largest enthusiast hi-fi show. It differs from most UK shows (such as Bristol and the North-West Audio Show) as it is run by enthusiasts; predominantly members of the WigWam Hifi forum. It’s a very friendly event with demonstrations of members’ systems and the opportunity to buy equipment. This year the show celebrates its 10th anniversary and continues its emphasis on vinyl- and valve-based systems.

Although EJ Jordan Designs won’t have an official presence, there will be the opportunity to listen to three Jordan Eikona systems at the show. The Lencoheaven Forum has a room and – in addition to their fine turntables – will have two Jordan loudspeaker systems on display, the DCR and the Reflex 7. The DCRs are the same loudspeakers that featured in our blog here.

Elsewhere at the show, Jon Espley of  Matteis Loudspeakers will be demonstrating his unique MLTL Eikona system (shown at the top of the page), featuring a concrete baffle (Jon wrote about this on our blog here).

The Wam Hifi Show runs on 18th March at the Kegworth Hotel and Conference Centre in Leicestershire.

Craftsman-built Eikona VTL loudspeakers

Eikona 2 VTL transmission line loudspeaker

Simon Regan of SR Woodworks has built a remarkable pair of VTL transmission line cabinets for his Jordan Eikona full-range speakers. The skilled craftsmanship is so evident we asked if he would share the details and his listening impressions:

Eikona 2 VTL transmission line loudspeaker

I recently purchased a pair of your Jordan Eikona 2 Drivers from Wilmslow Audio. I was really keen to have access to great sound quality at home, and after a lot of research chose your drivers and your VTL design. I wanted a pair of speakers which were really realistic, detailed and musical. I was also drawn to the idea of one driver per speaker and no crossover. 

I am a professional cabinet maker and wanted to machine and build the cabinetry myself over the 2017 Christmas break. I spent 2 weeks making the speakers, which was a really enjoyable process. I kept all the dimensions as per your drawing apart from the walnut framing which added a bit of extra depth to the exterior to take the speaker grille (note the actual baffle where the driver is mounted is positioned as per your recommended drawing). I also made the foot slightly deeper to follow proportions of the slightly deeper cabinet. My aim was to make a cabinet which displayed craftsmanship, complementing the Eikonas and the music played through them.

Eikona 2 VTL transmission line loudspeaker

Description:

  • Walnut veneered birch ply cabinetry. The veneers on the fronts/backs are book matched for visual interest.
  • The top, back and sides are constructed as a mitred box and the grain wraps around the cabinet. Veneers were chosen from Capital Crispen veneers.
  • Solid American black walnut framing. Japanese mitred frame
  • Mitre joint with rebate and tenon.
  • The feet were made up from a cross ply lamination of solid walnut. Visually I like to highlight long grain against end grain, and it also adds a great deal of stability to the timber, ideal for a foot.
  • Project Damp it sound isolation rubber feet. These are slid onto dowels on the walnut foot.
  • Fender style speaker grille wrapped around a walnut frame. Oxblood with gold stripe from All Parts. These are fixed to the speaker using Wilmslow Audio standard grille fixing studs.
  • Finished with two coats of Osmo Oil (clear satin matt) and a final coat of Liberon black bison wax polish.

Eikona 2 VTL transmission line loudspeaker

Listening impressions:

Whilst building the speakers I spent some time thinking about what songs in particular I would like to trial once the speakers were made. I narrowed it down to two songs.

The first song I chose was ‘Holding Hands’ by The Magic Lantern. I chose this track as I knew the song featured some interesting layering of instruments and an emotive vocal line. I was really pleased with the clarity of the saxophones and the VTL’s ability to distinguish them. Each line was so detailed you could hear all the subtleties and accents made by each musician and their instrument, making it quite an intimate experience. In my opinion, these are all characteristics which allow you to listen to the song in its true form, how the musicians played it and how the song would have been heard in the studio.

The second song was ‘Tethered’ by Rationale. I chose this song as a contrast. I wanted to hear a multi-tracked song which used synthesised instruments. Firstly I was struck by the sense of weight the VTLs produced (even at low levels). There were times you felt very grounded by the bass. I think the depth of field the VTLs produce is my favourite part, in my opinion as a result of their ability to access the full range.

These were just some details that stood out whilst listening to two songs. I have enjoyed listening to many other songs through the VTLs, and am constantly hearing and feeling music in a new light. They really do allow you to hear the full picture, where you have no option but to sit and listen.

 

EJJ note:

Simon has indicated that he is very happy to undertake commissions for the Jordan Eikona, whether based on the VTL or any of our other designs. Visit the SR Woodworks Facebook page or contact us and we will put you in touch.

Eikona 2 VTL transmission line loudspeaker

Project – Jordan Eikona and Subwoofer loudspeaker system

Last year, we published a series of blogs entitled Audio Building Blocks. We examined how the Jordan Eikona full-range driver could be used in a number of different ways – from simple, single-unit systems to loudspeakers incorporating 16 Eikonas per enclosure.

To start this year, here’s another way to use the Eikona; add a bass unit. Although this involves a crossover, if it is set at a low enough frequency, the use of a crossover won’t disturb the imaging or midrange detail of the Eikona and will relieve it of having to reproduce low bass notes. In this way, the system as a whole will play louder and cleaner than could be accomplished by a single Eikona.

Just such a system has been built by Chris, one of our customers in the US.

It is a very attractive, high-end loudspeaker which is being used in a dedicated music and theatre room (notice the plumbed-in wiring and the bass traps in the corners). The Eikonas are mounted in 5-litre sealed enclosures built of 25mm Baltic Birch. They operate from 120 Hz upwards whilst music below that frequency is handled by a SEAS subwoofer and passive radiator. The crossover is electronic and the bass system is powered by its own amplifier, built into the back of the enclosure.

Here are Chris’s comments:

“I was hesitant to try the Eikonas because of their cost … [but] I can say that I’m not disappointed I took the leap. In my opinion, the Eikonas are worth every penny and they are nothing short of amazing! … In general the Eikonas have a fullness to them and a more relaxed and smooth feel… they are extremely detailed and image well. The soundstage is huge and the music has depth to it.

I have them in sealed cabinets and crossed at 120 Hz to the subwoofers. They are extremely smooth and yet detailed! Best I’ve heard to date! I’m sure they will only get better as they break in but so far I’m very happy!!

The subwoofer is tuned to 25Hz, F3-31Hz, F10-22Hz. With room gain easily into low 20s… But for me, more importantly, the bass is extremely clean, crisp and controlled.

Overall I’m very happy with the outcome of my new speaker set up. Music is powerful and brings enjoyment to life!”

 

As always we are happy to receive photographs and information about loudspeakers you have constructed using the Jordan Eikona. Email them to us or contact us via our Facebook page. Keep up-to-date with the latest EJ Jordan news by signing up to our newsletter.

If you are building an Eikona-based loudspeaker – whether one of our published designs or your own – we are always available for advice and support.