ArthurDent Posted December 8, 2019 Posted December 8, 2019 (edited) Annual DIY-ers 7:45pm Wednesday 11th December Willis Room, City of Whitehorse Offices Maroondah Highway (Whitehorse Road), Nunawading Melway Map 48 Ref G9 Contact: 9437 1249 It's that time of the year again when the DIY members get to show off their Hi-Fi projects at the December General Meeting. This year we have two distinct systems to listen to, one based around a full range speaker and the other a conventional 3way box design. Our first system is a 'one man band' of DIY projects. Mark H has been busy over the year building a number of electronic components. Starting off with the front end, a 'Raspberry Pi' music server running into a homemade DAC, using the AK4497EQ DXD chip. The Grand Fidelity tube preamp in a SRPP (active load), takes care of the analogue signal with its pair of gorgeous looking 6SN7 sphere valves. The amplifier of choice for the night will be his 180 Watt compact Tripath Class D power amp in a retro looking wood Cheek enclosure. The speakers are also built by Mark, using a single full-range driver the 'Mark Audio' 12P (8") in a slimline mini tower enclosure. With an efficiency of 92dB, these speakers should easily fill the Willis room with plenty of sound. Our second system for the night is based around the classic looking JBL L 100's. With a 12inch base driver in a sealed box, the speaker comprises of a 4inch Aluminium Midrange from SB Acoustics and a 1inch fabric dome tweeter. All mitre cuts and routering was professionally done to pre finished boards. The idea being, something easy to put together, and no complicated or expensive finishing process. The speakers will be driven with another Class D power amp based on the 100W Sure Electronics module, with a valve pre amp using a pair of 6j1's. Is there a theme here? Source material for the night will be from a SACD player. Each system will have an allotted time of 45minutes, to give each presenter plenty of time to explain their gear as well as play some music. Looks like we will have an interesting evening. Nick Karayanis, Program Co-Ordinator. Ken Tripp Wise and Wonderful Webmaster Melbourne Audio Club, Inc. http://www.melbourneaudioclub.org.au Edited December 8, 2019 by ArthurDent
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