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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
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