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  1. For the January meeting of the Sydney Audio Club we are very pleased to have dedicated Sydney Audio Club member, Graham Allen, present the large reference version of Linkwitz kit speakers. These DIY speakers are one of many products created by Siegfried Linkwitz (refer to his website at http://www.linkwitzlab.com/index.html). Siegfried Linkwitz has over 40 years of experience in loudspeaker design, electro-acoustic system design and the perception of sound from loudspeakers in normal rooms. (As well, his name is one half of the respected Linkwitz-Riley crossover filter). In our September 2015 meeting, Graham presented a pair of Linkwitz Lab LX Mini speakers. They offer very good sound for a very modest outlay of money. This month, Graham will be demonstrating his recently completed Linkwitz Lab LX521 speakers. Refer to http://www.linkwitzlab.com/LX521/Description.htm. These unique speakers, designed by Siegfried Linkwitz, are wide range 4-way dipoles using per channel; 2 bass drivers, lower mid, upper mid and tweeter drivers. They should be quite capable of filling our club meeting room with a high quality, well imaged sound stage. Graham’s speakers are the LX521.4 4-way version with digital crossover, and are built acoustically identical to the published Linkwitz design, with some minor changes to the appearance to suit locally available materials. The timber used is Australian river red gum, with the baffles and baffle support shelf made from solid stock, and the side supports made from marine plywood covered with 2mm veneer cut from the same plank. The river red gum is finished in an oil based varnish. The bass enclosures are made with marine plywood, painted with a textured satin black. (See the photos of Graham's own speakers below this message.) Graham will give a brief technical description of the LX521 design approach, explain how they were constructed, and demonstrate the speakers on a range of music. For his presentation, Graham will use his laptop with JRiver as a source (via a USB streamer to the miniDSP 4x10 processor). Details of the system…. Linkwitz Lab LX521 speakers – These reference quality speakers offer articulate bass reproduction due to reduced coupling to room modes, neutral timbre and fast time response, low non-linear distortion and high instantaneous dynamic range, optimal spatial rendering of the stereo phantom image. Amplification – The LX521s will be driven by an 8 channel, 180W per channel, Hypex class D amplifier, using the UcD180HG amplifier modules https://www.hypexshop.com/DetailServlet?detailID=2151 and SMPS400A180 power supplies (4 separate power supplies) https://www.hypexshop.com/DetailServlet?detailID=3140. Crossover duties and digital signal processing will be handled by a MiniDSP 4x10 Hd https://www.minidsp.com/products/minidsp-in-a-box/minidsp-4x10-hd. The miniDSP 4x10 accepts digital and analogue inputs. Oppo BDP-105 Universal player – We will have an Oppo on hand for our BYO session. Refer to https://www.oppodigital.com/blu-ray-bdp-105/ and http://www.theabsolutesound.com/articles/oppo-bdp-105-universal-blu-ray-player-and-dac/ The second half of the music sessions will be our popular BYO. Members and guests are welcome to offer music to share with us all. So bring along your favourite music on CD/SACD or USB flash drive. (Sorry, no vinyl this month) All we ask is that the music and recordings be interesting. We'll ask you to tell us a little about the artist/recording before it is played. Tracks over 6 minutes will be faded out, to give everyone a fair go. Whether you are a novice or a seasoned veteran, you will have the opportunity to listen, learn and share your experiences with others. Feel free to come and hear the capabilities of the system, or to just share the experience with like-minded music lovers in a friendly and relaxed atmosphere. Guests are welcome – we are a very friendly club so you don't need to know anyone to join us for an afternoon of fine music and sound. Venue: Epping Creative Centre, Dence Park Address: 26 Stanley Road, Epping When: Sunday 15th January 2017 Doors open 1pm Meeting starts at 2pm Best regards, Tom Waters President Sydney Audio Club www.sydneyaudioclub.org.au tomwaters@sydneyaudioclub.org.au
  2. The September 2015 meeting of the Sydney Audio Club sees us once again gather for an afternoon of fine music, great sound and amicable company. Each month, the Sydney Audio Club presents the finest in high end audio systems for our members and guests. It's a bit like a private audio show once a month where you can hear and discuss equipment that you might not otherwise have the chance to audition. And you can bring along your own music to test the capabilities of the system or to just share with like-minded music lovers in a friendly and relaxed atmosphere. This month we will be presenting the Linkwitz Lab LX Mini speakers. These DIY speakers are one of many products from the fertile mind of Siegfried Linkwitz. Siegfried Linkwitz has over 40 years of experience in loudspeaker design, electro-acoustic system design and the perception of sound from loudspeakers in normal rooms. (As well, his name is one half of the infamous Linkwitz-Riley crossover filter). In his own words taken from the Linkwitz website… “The LXmini is a most remarkable loudspeaker. It converts electrical signal voltages into acoustic pressure variations, which are perceived as completely neutral and detailed even in a reverberant environment. With this design I want to give every music lover the opportunity to build and enjoy a reference quality sound system singing in their own living space.†These are unusual and interesting speakers, and although they may appear on the small side, we expect them to be able to drive our room. The pair we’ll have on the day were built by inveterate tinkerer and dedicated Sydney Audio Club member, Graham Allen. Graham will kindly give a talk about the speakers between tracks. Details of the system…. Linkwitz LX Mini speakers – Refer to http://www.linkwitzlab.com/LXmini/Introduction.htm plus http://www.thingiverse.com/thing:748550 and http://www.magiclx521.com/news.html. These speakers utilize a 6.5 inch bass driver and a forward firing full-range driver in each speaker. The drivers are from the SEAS Prestige range. Here is an excerpt taken from the Linkwitz website… “…With directivity controlled in this way the LXmini becomes much less sensitive to room placement, while also gaining in 3D imaging precision. The small, full-range driver on top is superbly smooth and detailed. It blends flawlessly with the pistonic, infinite transmission line woofer for a completely neutral sound in a reverberant room. The speaker stands 40" (1 m) tall. It requires two stereo power amplifiers of 80 W for woofer and full-range drivers. The four input signals to the power amplifiers are generated in a miniDSP 2x4 processor from the left and right outputs of a preamplifier or other device with a volume control.†Btw – Herb Reichert at RMAF 2014 had this to say… “The Linkwitz Lab's LXmini loudspeakers […] produced the most musically enjoyable, naturally balanced, properly toned, correctly detailed, music I experienced in any room on my beat.†Refer to http://www.stereophile.com/content/rmaf-2014-reichert-sunday#7ui6svMXPrp4CCCz.97 The plans to build them can be purchased through the Linkwitz Lab web site (for $105 USD). You can order the kit through Madisound in the US for $398 USD (on sale at the moment). Refer to https://www.madisoundspeakerstore.com/2-way-speaker-kits/lxmini-linkwitz-lab-speaker-kit-pair/ The pair Graham will be demonstrating have been built by him, closely following the Linkwitz plans with some minor cosmetic changes to the mounting of the high frequency driver and using solid granite bases. The finish on the pipe shaped enclosures is a polyurethane water-based varnish system applied over a textured and coloured paper substrate. Subwoofer - 2 x 15inch dipole subwoofer. NAD preamp – the NAD 1700 Monitor Series. NAD Power amps – the NAD 2600 Monitor Series on the bass and the NAD C320BEE for the high frequency. Refer to http://www.thevintageknob.org/nad-2600.html and http://www.stereophile.com/content/listening-7-page-2#GmHHDGot6lhR7XQz.97 Oppo BDP-105 Universal player – Refer to https://www.oppodigital.com/blu-ray-bdp-105/ and http://www.theabsolutesound.com/articles/oppo-bdp-105-universal-blu-ray-player-and-dac/ The second half of the music sessions will be our popular BYO. Members and guests are welcome to offer music to share with us all. So bring along your favourite music on CD/SACD, flash drive or vinyl. All we ask is that the music and recordings be interesting. We'll ask you to tell us a little about the artist/recording before it is played. Tracks over 6 minutes will be faded out, to give everyone a fair go. Whether you are a novice or a seasoned veteran, you will have the opportunity to listen, learn and share your experiences with others of a similar mind. Guests are always welcome – we are a very friendly club so you don't need to know anyone to join us for an afternoon of fine music and sound. We will welcome you at the door. Venue: Epping Creative Centre, Dence Park Address: 26 Stanley St, Epping When: Sunday 13th September 2015 Doors open 1pm Meeting starts at 2pm Best regards, Tom Waters President Sydney Audio Club www.sydneyaudioclub.org.au tomwaters@sydneyaudioclub.org.au
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