Ron Newbound and the DIY group of Melbourne Audio Club have been developing a new transmission line loudspeaker. As a group they came up with a design using tapered Sonotube pipes within the enclosure. Drivers and damping have been installed, crossover design and tweaking are planned for the next meeting. (On April 1st. Not an omen I hope).
If you would like more information come to the meeting Wednesday 15 and join the group. Also enjoy the demonstration of Hugh Dean’s AKSA amplifiers and Kef 105 reference loudspeakers brought by Ray of the Hi Fi Exchange.
8pm in the Willis Room, Nunawading Civic Centre. Third Wednesday of every month
And at Ray’s there is an interesting pair of Dahlquist DC10 speakers. Really worth hearing; if you’ve never hear these before, they are time aligned with mostly open baffles, electrostatic sound but with bass. And an interesting Kreisler valve radio. I don’t knoe anything about valve radios but I’m sure Steve will answer any queries.
Ray promises to play any CDs you bring on Saturday, come and compare the Dahlquists with the Puresound and other speakers.
Even though the exchange is being sold, the new home (Rookes Road Nunawading) will welcome the Saturday coffee club! The good news part is that I will not be at the new Exchange for at least the first few Saturdays-I will still be at the Camera exchange while John will help with the transition for at least the first month.
The move to Rookes Td will take about three weeks, I believe a coffee machine is on the list.
Nothing much will change, the website goes with the business, and much of the existing stock will be available. The servicing and testing equipment and a stock of valves will also be available. As I learn more I will keep the blog up to date.
Ron is bringing his desirable Axiom 80 for the next meeting. Goodmans Axiom 80s amongst the earliest of full range single drivers and are pretty rare these days. I know some members have a preconception that full range drivers have “unusual” sound reproduction, let’s listen with open minds.
Nick has sent this which will be in your MAN
A RARE AND SPECIAL PRESENTATION
Several months ago, a member came up to me at one of our general meetings, and said he had a special speaker he wanted to demonstrate to the club. “What’s so special” I asked him. “It’s a full range speaker from 1960”. Jesus! I wasn’t even born then. Why do you want to demo the speaker? “Well, since I joined the club back in 2007, I have not seen many full range speakers demonstrated at the MAC”. So for this month, after the AGM elections, we will have Ron Healy with his Goodmans Axiom 80 Loudspeakers.
The Axiom 80’s are a 10-inch,twin cone, full range speaker designed to reproduce bass fundamentals down to 20 cycles, and highs out to 20,000 cycles.The most revolutionary design, is its achievement of free cone suspension. A theoretical ideal that permits the cone to move as a true piston at low frequencies , without restriction. Ron has mounted two Axiom 80 driver’s in each cabinet, wired in parallel and fitted with a Zobel impedance matching circuit. Each driver has a sensitivity of 97 dB and a power handling of 6 watts RMS. The speaker cabinets are a Goodmans design fitted with their Acoustical Resistance Units
The equipment partnering the speakers on the night, will be all provided by Ron. He plans to bring a turntable for his selection of analogue music, and an Oppo 95 for SACD,s. I’m even told that he may play a DVD concert, just a short piece, to give the presentation a bit of variety. Considering that Axiom 80’s are seen as the holy grail of full range speakers, fetching more than $4000 US dollars on eBay. Their unique design – no rubber surround, makes them a very rare piece of speaker technology.
What also makes this meeting such a rare occasion, is the enthusiasm of this club member to volunteer his time , to bring his own hi fi system and provide the music. I hope this same enthusiasm will transform to some new faces volunteering their time on the new committee.
Caretaker Program Co-ordinator
Next meeting will demonstrate the ATC speakers we had hoped to hear in March. Bill Woodman described the reasoning behind the design of his drivers previously. Now we will be able to hear if they are as good as promised.
The September meeting was really good fun, the music was provided by members, Oppo 95 as the source, the preamp was a Lucas Cant “Black Arts” that Matt has now claimed. The amp was John’s own Tango designed power amp now using Siemens f2a long life pentodes ala Shindo Cortese and Simphonia. Fabulous sound, the speakers were Krixs using 2 8″ drivers plus Dynaudio D76 tweeter.
The magic combination. Goldbug Briar cartridge on Victor deck, Shindo Massetto preamp and the Mondo Ongaku copy. Tannoy 15″ Reds in Shindo made Autograph cabinets. For CD and SACD the high end Marantz.
For your delectation a pair of Lowthers in Alfredo cabinets.
The unusual Omni Audio Euphony, and the Omni Audio Maestro. These use Lowther drivers (PM6C in the Euphony, DX3 in the Meastro) in a vertical cylindrical enclosure in a 360 degree design. Made in Melbourne,
Interesting meeting, lots of members and visitors to see and hear the Omni speakers which really are beautifully finished. Chris the designer said one of the aims was to make them domestically acceptable, metallic green and red paint.
The sound was something else. Lowthers are fussy about the source and amplifier, and sounded better after swapping the Topping class D amp for a magnificent Luxman valve amp.
Wanted, even in rough condition. The JBLs use a 4inch voice coil and phenolic diaphragm. (And a 10.5Kg magnet structure!)
These drivers are often used for driving horns from 300Hz up.
Please respond by usung the comments so I can get back to you quickly.
David has amongst the best sounding Tannoys in Melbourne, he made the boxes himself and had the crossover designed by Cawsey. Every visit has been even better as David constantly upgrades the components, CD player, turntable, etc.
The latest experiment is using Kwan’s newly developed electrostatic panels for the highs. Detailed comments about the sound tomorrow.
Listening on Sunday reinforced my impressions of the Shindo boxes (also with Reds): Excellent transparency with superb dynamic range. The amp uses KT66 valves, whether or not this is the reason, this pair of Autographs had a much brighter and clearer top end than I’ve come to expect of Tannoy Reds.