A transmission line speaker like no other!

Melbourne Audio Club’s “Audio Action” group have finalised the unique transmission line speaker they designed and produced. The meeting is next Wednesday 21 June, as well as the AGM the new speaker will have it’s first public outing.

The Camel Project
Once again the Annual General Meeting has come around for another year. It is always the intention to keep business dealings at the meeting to a minimum, with nominations for Committee positions and Music Convenors.
After the club business, we will be entertained for the night by the guys from the Audio Action group. No, this isn’t a cabaret act, but a group of MAC members who have been lead by Ron Newbond in developing a speaker project. Over the past twelve months, the group has been collaborating in designing and building a ‘Camel’, well that’s what Ron calls it. The ‘Camel’ in question is actually a three way Transmission Line speaker, but not in the usual tall rectangular box shape.Well what do you expect when you get a dozen MAC members together to design a speaker?
This unique looking speaker is based around a cylindrical enclosure that houses the transmission line, while the front baffle presents to the listener a ‘surfboard shape’ that seems to float off the floor. You could even say the selection of drivers is unconventional. The tweeter is an air motion transformer (AMT), while the mid and bass cones are made from aluminium.
Ron will start the presentation with a short explanation on some of the technical issues with building such a speaker. How some of the challenges were resolved as well as why the group chose to develop this type of speaker. Then each member from the group will get to play a piece of music to the club. Ron assures me that the group will have a good selection of music that will demonstrate the best performance out of the speakers.Sounds like we will have an interesting and enjoyable night. Not to be missed.
Nick Karayanis, Program Co-ordinator.

Joe Rasmussen

After last week’s demonstration I checked Joe’s website

Www.customanalogue.com. ( note the correct spelling of analogue).

Lots to read and in investigate. He showed the frequency response, phase angle and impedance curves of his Elsinore speaker design. Worth a look, and certainly worth hearing of you get the opportunity.

Pictures of Joe will appear soon!

Jo Rasmussen in Melbourne

Next Melbourne Audio Club meeting Wednesday 17th May, in the Willis room, Nunawading Civic Centre.

The meeting begins at 8pm with reports of home meetings, other business tonight will be a vote on a change to the constitution. The presentation by Custom Analogue Audio and Joe Rasmussen JLTi will be of great interest to all Oppo users.

This month the club is very privileged to have an audio enthusiast travel all the way from Sydney to present at the club. Joe Rasmussen is known among the DIY audio fraternity as the “Father of the Buffered Gainclone” His collaboration with the late Allen Wright, led him to develop several projects starting back in 1975 with a “hybrid tube amplifier” In 2001 their work saw them develop upgrade modules for the first generation Sony SACD players.
Joe will be presenting at the club his latest upgrade projects. The JLTi Oppo level 4.2+ACB, is a highly modified Oppo-105D fitted with no less than eight modules. Each having a specific task – Master Clock – DAC Clock – Terra Firma power supply – all designed and developed by Joe at Custom Analogue Audio.
“Ultimate Digital playback deserves Ultimate Stability! This is about the importance of clocking CD players and digital playback, a new standard of performance. How to make digital sound more like good vinyl”
His collection of equipment that will fill the room with sound, will include two amplifiers, a prototype “Beyond Triode” amplifier – A New Type of Tube Amplifier, and a DIY 40 Watt “Transconductance Amplifier” This solid state unit will be brought along for a bit of fun. Designed to output ‘current’ it will be demonstrated with his Elsinore Mk6 speakers. Compatible with this amplifier they can be driven from any source impedance and hence does not rely on the ‘damping factor’ of the amplifier. The “Beyond Triode” amplifier encompasses thirty years of experience and developments rolled into one design. The prototype unit a Yaqin MC-100B, has been upgraded to give a great boost in the ‘Permeability’ of the output transformers, which then translates into an extreme level of resolution.
To round off the equipment list for the night, two versions of the JLTi Phono Stage will be presented, a single box unit, and the new Deluxe Phono Stage. The Deluxe version is a two-box unit with a ‘beefed up’ design in the gain and buffer stages plus a massive separate power supply with extreme filtering that reduces power supply noise.
What Joe Rasmussen has achieved by taking a good quality product, amp or CD player, and lifting its performance to more than just one level, but several, makes music sound just lovely-Just Listen To it.
Nick Karayanis – Program Co-ordinator.

Helix and Mark Doehman

Next Wednesday we will experience rhe new turntables designed by Mark. His last talk at the Melbourne Audio Club was one of the best presentations I can remember. Informative and very interesting.

Wed 19th of April, 8pm in the Willis Room, Nunawading.

MARK DOHMANN with his HELIX 1&2 TURNTABLES
Back in October 2013, the club was very privileged to have one of the most influential audio engineers of the analogue world present at the Melbourne Audio Club. He is Mark Dohmann, the man who designed the Continuum Audio Labs Caliburn turntable and Cobra tonearm. The Caliburn set a new benchmark when it came to sound quality; even Stereophile Magazine had to give it a new rating, A+, as well as “Product of the Year” for 2006.
Mark has moved on from his involvement with Continuum Labs, and has formed Audio Union, a collaboration with Thrax Audio Ltd to bring his latest statement turntable to the “High Fidelity” market. The Dohmann Helix 1, is the result of complex and advanced engineering technologies, that takes it to the next level in turntable design. The Helix 1 features a radical approach to advanced motion control to the motor and platter. Another innovation is in the complete integration of a customised negative stiffness isolation system, which results in an ultra-low natural resonance, 1.5Hz in the horizontal plane and 0.5Hz in the vertical.
The Helix 2 turntable is so new, it doesn’t appear on his web site. As far as I am aware, this will be its first public showing. Quite an honour for the club. Another first will be the new addition to the Thrax portfolio of equipment. The LYRA loudspeaker will make their debut at the club partnered with a pair of HEROS 100W class A mono blocks and the matching DIONYSOS pre-amp. The Lyra is a two-way, three driver monitor sporting a vented enclosure that is made of aluminium plates, screwed together. The D’Appolito array on the front panel, incorporate two 6.5” woofers with magnesium membranes and copper phase plugs. The tweeter is a ring diaphragm compression driver crossed over at 1.5 kHz. Its shape was developed by Spherovox with specific directivity and frequency response.
“Helix 1 rewards the listener with the closest facsimile to the master tape. Its design is a significant enhancement on state of the art and its motion control defines what will become part of a new breed of “Super Turntables”.
Nick Karayanis – Program Co-ordinator

Mark Doehmann and Helix

To hear the Helix 1 and Helix 2 come to the April meetong of the Melbourne Audio Club. Mark Doehmann is expected to bring both turntables to the Willis room. Make a note- third Wednesday of every month

An innovative transmission line loudspeaker

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

Hugh’s Maya amp at MAC Wednesday

A NIGHT WITH ASPEN AMPLIFIERS
The name Hugh Dean is synonymous with the Aspen amplifier range. His kit form amplifiers have won many hearts among audio enthusiasts who appreciate a very high standard of sound.The Maya 200 and the SAKSA 85 amplifiers are a culmination of over twenty years of innovative design, starting in 1974 with the Glass Harmony.
The Maya was conceived in 2015 when a topology breakthrough appeared, which Hugh will attest has brought huge improvements in speed, bandwidth and clarity. This 200W per channel amplifier comprises four discrete stages: Input stage including a feedback node, Voltage Amp stage, Driver stage, and the Output stage which uses a pair of very large 480 watt MOSFETS.
Hughs primary aim in his amplifier design is very low odd order harmonics. The MAYA avoids phase issues with extremely linear first and second stages. With very low THD, less than 0.025% into 200W and very low noise, the Aspen amplifiers have none of that solid state glare. The amplifiers can be bought as a DIY build from a pair of tested and assembled pcbs modules, starting at $930 plus GST for the SAKSA 85, and $2200 plus GST for the MAYA 200. Both units can now be purchased with purpose built full enclosures.
An OPPO 105 multi disc player will be playing the music, while a pair of classic KEF 105/3’s will entertain us with their sound. The 105/3 was the first Reference Series Loudspeaker from KEF to incorporate Uni-Q technology. This four way floor-standing speaker embodies several advanced and unconventional design features for its time. Its bass section drivers are mounted within the cabinet in a double coupled-cavity configuration. The combined output of the two woofers is radiated through a front mounted 6 inch diameter port. The D’Appolito array on the front panel is shared with a pair of midrange drivers and a KEF Uni-Q driver, with a concentric 6-1/2 inch cone and a 1 inch tweeter.
Midrange bloom, solid state glare, lifeless sound? None of that with Aspen Amplifiers.
Nick KarayanisProgram Co-ordinator.

B&W 800, CLASSE 600. Melbourne’se Audio Club

Wed night, not to be missed

BOWERS AND WILKENS PRESENTATION: B&W 800 D3 and B&W 805 D3
Convoy International is the Australian importer for what arguably is Britain’s most famous loudspeaker company: Bowers and Wilkins. For half a century B&W has been building speakers, and their latest 800 series represents a landmark in the company’s history. Specifically created to celebrate B&W’s 50th anniversary, the 800 series has been re-invented, from the cabinets through to the drive units, just about every component has been newly developed.
Two models will be demonstrated on the night, the 800 D3 and the 805 D3 as two different systems. The B&W 805 D3 will be first. This stand mounted speaker uses a 165mm bass/mid driver matched to B&W’s famous Diamond Tweeter, quite a step up in materials from cloth or base metals that are usually used to build tweeters. Powering these speakers will be NAD’s newest flagship integrated amplifier, the M32 from their ‘Masters’ series of hi-fi components. Speaking of flagships, the second system will feature B&W’s most distinctive looking model, the 800 D3.
This three way floorstander with its Nautilus tube, in which the tweeter is mounted, the ‘head’ containing the midrange driver, and the bass unit, are all entirely new. Gone is the yellow coloured Kevlar material now upgraded to a metallised finish on the midrange cone. Just as striking is the new head, reshaped to enhance its rigidity, it now sits on the shoulders of the bass cabinet. The most obvious change is the curved front to the bass cabinet, into which are fixed circular metal mounts for the two 12 inch bass drivers. To prevent cabinet vibrations and inhibit standing waves, a system B&W calls ‘Matrix” bracing has been optimised, while the back of the cabinet gets a finned alloy heatsink, -it’s not just there for looks.
The B&W 800 D3 deserves a flagship system to show off their abilities, from the stables of Convoy, a pair of CLASSE mono blocks will power the speakers. The CA-M600 amplifiers put out 600 watts each, plenty of headroom for the speakers and the size of our room. The matching CLASSE CP-800 II Preamplifier/Processor will complete the system.
With such a distinguished brand of high-end speaker and amplification at the MAC, the best seats in the house are going to fill up very quickly.
Nick Karayanis – Program Co-ordinator.