Goodmans Axiom 301 Speaker

Goodmans Axiom 301 Speaker Manual
Goodmans Axiom 301 Speaker System
Goodmans Axiom 301 Speaker Manual
Goodmans Axiom 301 Speaker Problems
Goodmans Axiom 301 Speaker Amplifier

Close to what the Axiom 150 mkII would look like new.

Goodmans goodmans industories ltd. 1952（昭和27年） axiom 80 24cmフルレンジスピーカーユニット￥26,500 神格化された異端の名作。このユニットを真っ先に目をつけ、自家用としたのは、弱冠22歳. 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. Goodmans 12 inch Axiom 301 speakers with Trebax crossover 5k/20xl PAIR. Collection in person. Or Best Offer. Goodmans Havant SL Stereo Hi-Fi.

The whizzer cones were removed from the drivers.
The whizzer cones are made from some heavily impregnated rigid paper
and a fabric dust cap was glued to the throat to protect the voice coil.

Measurements

TS-data after restoration of surrounds and recentering of voice coils. Now, a BL factor of 20 is not an everyday sight and these drivers are extremely sensitive. Calculated 97 dB/1W/1m. And measurements confirm this.

Original Goodmans data.

Two things from the above LspCAD modelling: The Speaker Unit Editor is a great feature allowing you to check your measurements by cross calculation. As can be seen there's a good correlation between data. My Tannoy test cabs will serve as initial cabs for these drivers and a decent alignment can be a achieved giving a good response down to 50 Hz. 150 liter would take the response down to 40 Hz, but these drivers will be tried in an open baffle construction. Preliminary 'test' can be seen below.

Left: The impedance curves tell a lot about driver performance. As can seen, the Fs of the restored drivers are fairly good, but compliance of suspensions are not exactly the same, one driver having a more narrow impedance peak compared to the other. All the ripples on the graph reveal suspensions not working properly, but it's been seen worse, much worse.
Right: Impedance of driver in my 95 liter test cabs. Vent tuning is 45 Hz = two holes in front panel of 75 mm diameter.

Frequency response of two drivers in test cabs, quite nice.
Reading normalised for 2.8V at 1 meter distance.
Sensitivity = 96-97 dB/2.8 V.

The following three graphs were made in LspCAD just to get an idea of how easy - or difficult - the Axioms would be in more conventional applications. Above modelling for a potential two-way system with a point of crossover around 2.5 kHz. I've tried setting up a two-way system with the Axiom bass and Wharfedale Super 3 tweeter with a point of crossover around 5-6 kHz and got a reasonably flat response. The sound wasn't bad at all. Having some 550 cm^2 cone area for midrange is special and the transient capability of these drivers is phenomenal.

Above modelling a point of crossover around 800 Hz. A fairly smooth decline of the Axiom response is seen.
The minor notch at 2 kHz can easily be handled by by-passing L1011 with an RC circuit.

Simulation of a 3-way system with the Fostex FE126E for mid and
Efi live license crack. Wharfedale Super 3 for treble. Doesn't look bad at all.

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Here's my open baffle test made from whatever I had at hand in my workshop.
Taking the Axioms down to floor level and getting decent room-gain is special.
The bass may not go deep, but you have the feeling of extension all the way down.
Running the Axioms full-range and playing Nils Lofgren/Acoustic Live is chocking.
You get a feeling of having never heard the dynamics of the recording before this.

So much on the Axiom 150 mkII drivers.

Go to: OB7, Axiom 150 mkII in open baffle experiment.

Goodmans Axiom 301 Speaker Manual

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

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 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.

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

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.

Goodmans Axiom 301 Speaker System

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.

Goodmans Axiom 301 Speaker Manual

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!

Goodmans Axiom 301 Speaker Problems

Goodmans Axiom 301 Speaker Amplifier