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Part 3: DIY 10' Goodmans Axiom 80 Horn
Goodmans 241s, which were used by Selmer far more often than Vox, are great speakers. Vox used them only for a short time in 1966 for AC50 and AC100 cabs. General views of the cab (post-fix) As mentioned above, most of the original wiring loom survived. 29 results for goodmans speaker. Save this search. Update your shipping location. Goodmans axiom 301. From Russian Federation. Or Best Offer +C $66.77 shipping. Pair 12' 4A32 LOMO same date fulrande speakers soviet goodmans klangfilm. From Ukraine.
Space, the instruments and the music
[Italian version here]Product name: Coral based horn with Goodmans Axiom 80
Manufacturer: DIY Cabinet Axiom 80
Cost: € 600 cabinet only (Currency conversion)
Reviewer:Chris Templer - TNT South Africa
Reviewed: February, 2020
Manufacturer: DIY Cabinet Axiom 80
Cost: € 600 cabinet only (Currency conversion)
Reviewer:Chris Templer - TNT South Africa
Reviewed: February, 2020
Introduction
Go back to Part I and Part II of this series of articles.This Coral derived cabinet has fascinated me from the outset and when a pair of Goodmans Twin Axioms came my way I started on yet another voyage of discovery. Having built the other two pairs with a painted black finish to save costs, this time I determined to go with Walnut with Rosewood trim. As with most so called full range drivers, I find I want a bit more treble and had a pair of tweeters which were to be incorporated into the front panel.
As nothing in my experience goes to plan, at the last moment I found a pair of the supposed Holy Grail of full range drivers, the Goodmans Axiom 80. Which were slightly smaller. Need I add that this happened after the cabinet was almost complete! To further annoy, after the cabinet was modified to accept the Axiom 80's, a friend took the Twin Axioms off me and had another set of cabinets built to house them. The 'Ever Decreasing Circles' saying comes to mind.
Technical
Goodmans Axiom 301 Speakers
The Coral cabinet was originally designed for drivers smaller than the 12' ones I used, so I felt on pretty firm ground going with the extra expense of wood finish. Goodmans drivers are all efficient/sensitive and both the Twin Axioms and Axiom 80's I assumed to be around 98 dB/W/m. I say assumed because there is very little to go on as in the day sensitivity was a given in speaker design. Twin Axiom details are here and information on the Axiom 80' is here. Here is a link to Fertin Acoustics who claim to be making a modern version of the Axiom 80.
The Driver
What makes the Axiom 80 so special is that it has neither surrounds nor spider. Apple mac deals for teachers. The cone, at its periphery, has double cantilevers connected to a ring system as does the voice coil. Because of this the cone moves in an almost perfect piston like manner, with little or no bending moment applied to the cone and vanishingly small resistance to movement in/out. To quote Robert Heinlein: «TANSTAAFL or There Ain't No Such Thing As A Free Lunch.» There are downsides, all three of them:
a) No dust protection to the voice coil assembly
b) Despite the powerful magnet (17,000 Gauss or 1.7 Tesla) the speaker can only handle 6 Watts
c) It's a bit fragile - the cantilevers have a history of coming loose from the cone. One of mine failed this way but a dab of glue fixed it.
b) Despite the powerful magnet (17,000 Gauss or 1.7 Tesla) the speaker can only handle 6 Watts
c) It's a bit fragile - the cantilevers have a history of coming loose from the cone. One of mine failed this way but a dab of glue fixed it.
The specs claim a response of 20 Hz to 20 kHz, the cabinet limits that to 30 Hz where it roll off very sharply.
Axiom 80 brochure
Looking closely at the above pictures the gap between the cone and basket is very small. This must have been a difficult and expensive speaker to make as there are many parts either cast into the frame or machined up to suit. Each of the cantilevers is adjustable, as are those that position the voice coil. In addition to that, the circular frame that holds the front cantilevers consists of two circular rings with three ribs which is then screwed to the main basket and with machine screws into threaded holes.
Cabinet
Interior from the front and rear. The picture on the right has an extra hole for the tweeter. These pictures are before adding the final 16 mm veneered panels.
On the Left clad with veneered panels, tongue to help couple to the floor and ready for the Twin Axioms. Center and Right is the modified version with an additional speaker panel to adapt the slightly smaller Axiom 80. The set made up for the Twin Axioms did not have the protruding tongue as they were destined to stand in one place - mine had to have wheels as I need to move them from time to time. The look much nicer minus the tongue, but as they say 'needs must when the devil drives!' There is no obvious difference in how the cabinets couple to the floor with both giving copious bass until the roll off point at 30 Hz. All exterior panels are made up of two 16 mm panels glued and screwed together. On the Twin Axiom version the speaker mounts from the outside against the 32 mm front as in the previous cabinets in Part 1 and 2. Due to having a third panel in the Axiom 80 'fix' the driver frame was rebated into the 32 mm front and a third 16 mm panel screwed on top hence the slight protrusion of that panel (Center).
Listening & Conclusion
What you get however is astonishingly realistic sound with tiny things not usually heard in the more normal speakers. And I'm not talking about being able to differentiate between gross things like ('Is it a Clarinet or Oboe in full orchestra' or 'I can hear the the mixtures in the organ but can't hear when they break back'). The level of detail in the true sense, like being able to separate violins in ensemble or being able to hear that the brassy sound is a Cornet rather than a Trumpet, is usually beyond any normal speaker. Including a pair of Sound Lab electrostats I once owned. In fact these speakers (Axiom 80) are the closest thing I have heard to my Altec A7 clones here, although obviously they are not quite as powerful. They do however play more than loudly enough to give a convincing imitation of concert level for normal orchestra works, Jacques Lousier, Jazz at the Pawn Shop and the usual audiophile favorites are reproduced with aplomb. Listening to Guy Bovert playing a smalish organ the differences in intonation of each pipe is easily heard likewise each small adjustment to the swell shutters.
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If one ignores the drivers abilities and concentrate on the cabinets one begins to appreciate that they are a marvelous bit of design by Coral and my tweaking by making the horn mouth larger seems to have helped. Keep in mind that a piano's bottom note has a 28 Hz fundamental tone and this is reproduced well. The cabinet as built does not have any extraneous resonances or colorations and because it is horn loaded, efficient. My listening room is 64 sq. meters and all of the iterations of this cabinet fill this space with no effort. That the internal dimensions are correct is evidenced by only tiny cone movements even when pushing hard even with a driver with no surround (seal) between the front and back. Unless you regularly play bass heavy music you won't need a sub.
Equipment
Amps: TacT/Lyngdorf 2175 SDAI, Leak Stereo 20, Parallel SE 300B Triodes.
Speakers: Altec A7 stacked clones 105 dB/W/meter, Vitavox DU120 in Onken cabinets, Goodmans Axiom 80 97 dB/W/meter in Coral based rear loaded horns. Sub Woofer 100 dB/W/meter.
Inputs: Cambridge 851n Streamer, Studer A80, Otari MX50, Fostex E2, Akai M9.
Speakers: Altec A7 stacked clones 105 dB/W/meter, Vitavox DU120 in Onken cabinets, Goodmans Axiom 80 97 dB/W/meter in Coral based rear loaded horns. Sub Woofer 100 dB/W/meter.
Inputs: Cambridge 851n Streamer, Studer A80, Otari MX50, Fostex E2, Akai M9.
DISCLAIMER. TNT-Audio is a 100% independent magazine that neither accepts advertising from companies nor requires readers to register or pay for subscriptions. After publication of reviews, the authors do not retain samples other than on long-term loan for further evaluation or comparison with later-received gear. Hence, all contents are written free of any “editorial” or “advertising” influence, and all reviews in this publication, positive or negative, reflect the independent opinions of their respective authors. TNT-Audio will publish all manufacturer responses, subject to the reviewer's right to reply in turn.
© Copyright 2020 Chris Templer - [email protected] - www.tnt-audio.com
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Goodmans Axiom 301 Speaker For Sale
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DIY 12' Goodmans Axiom Horn - Part II
Space, the instruments and the music
[Italian version here]
DIY design: horn loudspeaker for 12' Goodmans Axiom 201 drivers
Author: Chris Templer - TNT-Audio South Africa
Published: September, 2015
Author: Chris Templer - TNT-Audio South Africa
Published: September, 2015
Introduction
Having proved the design using a 12' Tannoy driver and having a pair of NOSGoodmans Axiom 201 drivers in unsatisfactory reflex cabinets the step to another pair was almost a must. This short article furthers myexperiments with the Coral derived horn.
Design & driver
As before the outer panels are 32 mm thick Supawood (dense MDF) and finish is piano black. Again the hardest part are the cut outs required to fitthe magnet structure of the Goodmans driver which is very different in size from the 12' Tannoys.
The panels behind the driver this time have a 50 mm layer of high density foam to stop back reflection through the cone. As the Goodmans cone is thinner and the structure of the speaker is very open back reflections are a problem if not damped out.
The panels behind the driver this time have a 50 mm layer of high density foam to stop back reflection through the cone. As the Goodmans cone is thinner and the structure of the speaker is very open back reflections are a problem if not damped out.
The 201 has a rating of 15 Watts at 16 Ohms (according to the specs: 30 Watts USA) and is extremely sensitive. Figures ofaround 95 dB are quoted (at 16 Ohms apparently 100 dB). I have owned more than a few pairs of these drivers and they are well nearindestructible despite their rating and do not suffer from problems with the surround, ever.
Cone excursion is a total of 20 mm but good cabinet design limits this. In the Coral derived horn the cones only justtremble with less than a couple of mm movement even on loud crashes or bass drum strikes. Which is what should be expected from a good horncoupling.
There have been comparisons between the better class Lowther drivers and the Axioms with the Goodmans being equally transparent, but without the humps in response of the Lowthers and I might add without the bending frames or fragility of the cones and surrounds.
Goodmans Axiom 301 Speaker Parts
These drivers can still be had via the second hand market at very reasonable prices or more modern drivers could be substituted provided they are reasonably sensitive.
The sizes once more: 1.140 high X 0.470 wide x 0.450 front to back, and again that measurement does not take into account the lip sticking out at the bottom.
There are ring covers for the driver mounts the screws of which still need to be blackened and the light colour wooden cabinetsurround is of Jacaranda wood as before.
Above is the finished item. The HF horn on the Tannoy uses two EMIT ribbons on the Tannoys, no extra help is needed for the Goodmans. At left rear the Double Autographs horns with two 15' Tannoy Monitor Golds per side.
Listening impressions
Goodmans Axiom 301 Speakers
The equipment used again, is as follows. Shure V15 V with Gyger stylus, EMT 948 turntable with EMT 929 Tone Arm, Jolida PhonoStage, Valve pre-amp and Parallel 300B SET Mono Blocks built by Alan Hobkirk here in South Africa. Maximumpower is around 8 - 12 Watts. Interconnects are from LM 240LF coax.Good for up to 5 GHz with a loss of 5 dB per/100 meters at 30MHz so atthe low frequency that we use in audio there is no loss worth speakingabout. Speaker leads are from twin lead (rip cord), conductor 2 mm sq.
This was quite a revelation in that the Goodmans easily outperformedthe Tannoys in every aspect. The Goodmans are more revealing and lesscoloured than the Tannoys with better upwards extension. In theprevious article I alluded to how the Tannoys got the timbre, scale andspace information right. I now need to backtrack a bit on the timbrepart as the Goodmans are more real sounding than the Tannoy. TheTannoys are very, very good but I prefer the Goodmans.
Conclusion
The point of this exercise was the Coral Horns and their design with themodification I applied have worked out better than I could have hoped.
In both cases the scale of the sound is better than most any other speaker I have heard apart from far bigger and much more expensivesystems. Both versions throw a sound stage that is wider than the cabinet placement, center to center 4.2 meters apart and because ofbeing horns can be placed against the rear wall which frees up room space.
In both cases the scale of the sound is better than most any other speaker I have heard apart from far bigger and much more expensivesystems. Both versions throw a sound stage that is wider than the cabinet placement, center to center 4.2 meters apart and because ofbeing horns can be placed against the rear wall which frees up room space.
Both of them reproduce the ambiance of the venue and both image extremely well despite being further apart than what is considered thenorm. As an aside my Double Autographs are much further apart and also image perfectly. One feature of horns is that they tend to energize theentire space they are in and most of the time (recording dependent) are hard to localize as actual speakers, rather there is a big wide andhigh sound field that instruments play in as per live concerts.
Both, again due to them being horns, have transient attack and dynamics that lesser speakers just don't have and are easily in the same range aselectrostatics but without the danger of becoming barbecue grids when the volume is cranked up! Rock or orchestra, solo guitar or trumpet,brass band or jazz quartet - you are there!
© Copyright 2015 Chris Templer - [email protected] - www.tnt-audio.com
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