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  1. For the first time, I have a dedicated room for HT and Gaming and I have finally finished the acoustic treatment of the room. To create this space of 3.4 x 4.9 x 2.5 meter, I had to move the laundry, toilet and bathroom and knock some walls down. Yes…….. the missus really, really loves me. I had a look at soundproofing the room but decided to not go through with that idea, because the room was rather smallish to begin with and the build a bit complicated, with all the different walls and joist intersecting with each other and with the rest of the house. The room has a double brick outer wall with an air gap in between it, as the front and the right wall. The front wall also has a window in it behind the AT screen. The left wall is a solid double brick internal wall. The ceiling has a couple of 200mm exposed roof joist with some timber on top, 100mm insulation and a flat sheet metal roof. The back wall is newly constructed and is made out of 17mm plywood with 10mm gyprock on top, on both sides, with insulation in between. And the floor is a solid concrete slab. This room is rather solid and therefor rather challenging regarding bass issues. All treatment is DIY, and the total material cost for acoustic treatment is around $1100 AUD. The screen wall is a timber frame held up by corner (bass trapping) towers, resting on top of the floor boards, and locked into place by screwing it into the roof joists. It is sitting 550mm from the front wall and is basically functioning as one giant bass absorption trap with 50mm Autex High Density insulation. The wall around the screen has been finished with 6mm MDF sheets with a RPG binary pattern as a finish, and to bring some reflections back into the room. The area behind the AT screen is fully covered in insulation, except for the center speaker. The coverage of unexposed absorption of the front wall is roughly 60%. This improved clarity and sound stage a lot. It also helped with decay rates in the bass frequency. Enough to improve bass clarity, but not enough to even out the decay rate over the full LF frequency range. The bulk heads around the ceiling have been added on later and consist out of 10mm gyprock with more insulation behind them. The rest of the ceiling has been covered in a binary slat pattern that is hung from the 200mm exposed roof joist, and the space between the roof joist has been filled with more insulation again. The coverage of unexposed absorption on the ceiling is roughly 38% I found that this improved stage depth the most. The back of the room has been treated with panels made from the same 6mm MDF binary pattern and Autex insulation and have been mounted at various distances from the wall, 50-100-150mm. I had the mount one on a hinge as it was covering the door. I found this to be a big improvement in clarity and precision of tracking in sound effects. Thanks to clever placement of subwoofers and listen position I have been able to create a LF response for subs and full range front speakers, without any nulls and only need to cut off peaks to receive a flat SPL response. The frequency response of the decay times is less than flat due to the rooms solid build, but doesn’t kick in for the first 20ms, which isn’t too bad. All in all I am quite happy with the outcome, but isn’t my best work regarding finish, as I have favored speed instead of a quality finish.
  2. COVID-19 took a real toll on postage time but I eventually received all of the components from various sources and started my build of a Stereo Coffee within the last week or so. Chris Daly (@stereo coffee) is an amazingly responsive and knowledgeable designer and I could always rely on him replying to my emails with extreme rapidity and clarity; he's a pleasure to deal with. I believe that I could have ordered a built up unit from Chris for the ongoing cost of everything I have amassed, however I enjoyed this voyage of discovery, having never before built any electronics, except for a pair of monitor style speakers from a kit some 20 years ago. I took things very slowly, measuring up clearances between the boards and the Jaycar toroidal transformer that I wanted to use in place of the Jaycar SMPS. Despite that I realised I would have to drill a replacement hole for the transformer as it needed more clearance from the back of the IEC socket than the one I did initially. Build Summary: Stereo Coffee LDR pre-amp boards, May-June 2020 build spec. ($264 incl. GST from Chris Daly's eBay store) Brushed aluminium pre-amp case from eBay (China, $120 delivered). Pre-drilled with 8 RCA holes, knobs, and IEC socket supplied (upgraded to Furutech). Furutech fused IEC socket, with a 500mA slow-burn fuse bought from another SNAer. 1 pair Audio Note silver-plated RCAs for the Stereo Coffee outputs 1 pair Connex solderless rhodium-plated eutectic copper RCAs as I/P 1 Aliexpress gold-plated copper RCAs for I/Ps 2 and 3. Pic 2 shows the RCAs wired (messily) and the LDR board. 20 VA Jaycar toroidal transformer (MT2084) Wire from PartsConnexion (Canada: partsconnexion.com) bargain basement - 1. Duelund 26 awg tinned copper with oiled-cotton insulation. Used for signal wiring from RCAs to board. 2. Duelund 20 awg solid-copper with oiled-cotton. Used from switch to main board I/P 1 , switch pole, and start-circuit between main and LDR boards. 3. Connex 24 awg tinned copper, from switch I/P 2 and 3 to main board. My biggest build challenge was trying to solder the ground leads to the Aliexpress gold-plated (copper signal pin) RCAs because I was using such fine wire. I splashed out on a second-hand Groot soldering station that made life much nicer than if I had used a cheap Jaycar iron or similar. 28 June: I finally finished my Stereo Coffee (SC) build today, after some other interruptions, and a very steep learning curve when it comes to to soldering 26 awg wire in confined quarters. I connected it first to my simple head-fi setup: desktop Mac playing Tidal, to Schiit Modi 3, then SC, then Cavalli Tube Hybrid amp and Massdrop Sennheiser HD6XX. Having proven that nothing untoward happened, I then proceeded to connect it to my main system. I need to mark some volume references and I have further work to do, to deepen the switch knob/shorten the shaft, and better secure the volume knob (hole-deepening may have obscured the securing stud inner thread area). Performance: I'm still inside five hours of listening time, however with it hooked up to my main system (pic 1), the first few bars revealed a richer bass than I am used to. I have a great pre- in the Bryston BP25, however the Stereo Coffee is even more revealing than the high level I was already used to. A favourite well-recorded album is Holly Cole's 'Temptation' and one that I know well. The SC makes that album even more involving and relaxing than ever. Separation between instruments, spatially and tonally is heightened, drums and cymbals have more resolution and the sound-stage is deeper. I haven't noticed any widening of the sound-stage in what I've listened to so far although I'm sure the relatively constrained positioning of my speakers is a factor, although I don't lack great imaging from them. The overall performance I'm hearing mixes clarity, and resolution with a relaxing, analogue (in the best sense) reproduction. I'm listening exclusively to 44.1 kHz/ 16 bit FLACs, either from CD rips or from Tidal. I sold off my CDP (Naim CDS) because my Auralic Aries streamer enables me to play CDs from a computer USB drive, and rip on-the-fly if so desired. Combining that with my Gieseler Klein III DAC with Enhanced Gold Tune Kraftwerk LPSU gives me sound quality that now negates my need for a traditional CDP. Some test music: 1. Holly Cole, 'Temptation', 'Frank's Theme' opening piano notes are amazing 2. Pat Metheny/Lyle Mays, 'As Falls Wichita, So Falls Wichita Falls'. This title track is a great test of the atmosphere that purports to be in a large stadium (though a friend told me it was studio recorded!). I use this track to compare pre-amps ...the SC is winning! 3. Sara K, 'Hell or High Water' , Fabulously recorded... sounding wonderful (it usually does!) 4. Ben Harper, 'Welcome to the Cruel World'. Just more resolution and presence and I was already very happy with my previous setup. 5. Jordi Savall, 'The Celtic Viol II', Comments as per #4! System comprises: Stereo Coffee LDR pre-amp boards, May-June 2020 build spec. Shunyata Research Hydra power conditioner and power cables. NAS-files, or Tidal, serving up 44.1 / 16 FLACs over wi-fi to Auralic Aries streamer (Femto clock and LPSU model). iFi iUSB Nano 3.0 and Curious USB cable between streamer and DAC. Gieseler Klein III DAC (USB) with Enhanced Gold Tune Kraftwerk LPSU. Bryston Cable+ ICs from DAC to Stereo Coffee. Rega P3, with Exact cart and iFi iPhono2 phono stage. Ikea bamboo chopping board! Bill's Covid-busting cable #2, from iPhono2 to Stereo Coffee Morrow Audio MA-1 baseline unbalanced ICs from SC to Gamut D200 Mk 3 dual mono poweramp*. Morrow Audio SP-4 speaker cables. Sonus Faber Concerto Home speakers. * My Bryston BP25 pre- uses Shunyata (Aries) balanced ICs to the Gamut, so the relatively cheap Morrow MA-1 unbalanced ICs aren't in the same league, yet the SC is delivering higher performance. Later I added short silver RCA-XLR ICs to those Morrow MA-1 ICs using female-female couplings, so that my Gamut now uses its XLR inputs. I can notice a difference, as did the family, when I unpaused Tidal and the extra volume hit with a blast (different I/P sensitivity on the amp). I have now ordered an RCA-XLR hybrid cable from @Bill125812 as I want to continue to feed the Gamut through its XLR sockets. I am very, very happy with my Stereo Coffee performance and also pleased that the challenges I found building it have added to my enjoyment of the product. I'm now thinking what else can I build ... perhaps another Stereo Coffee and something like a Goldclone amp?
  3. Further information: Single pack of Absorb XHD50 in black (6x 2400x1200 sheets). only needed two but MOQ is 3 packs. Perfect for DIY acoustic panels or bass traps. Photos: Advertisements without photos of the actual item will not be approved.
  4. Further information: I have for sale an Elma Rotary 4 pole 24 way switch (model 04-4133). Perfect for a High-End 2-channel ladder stepped attenuator. It comes with the stop pin. I bought it a couple of years ago from the hificollective in the UK to build a stepped attenuator for my DIY project. I could not find time to finish the project, so the sale. "High quality selector switch, non-magnetic bodied switch with 3 micron gold plated contacts over copper alloy. Ceramic wafer. Swiss made. Mounting hole 10.2mm, 6mm diameter shaft, 15mm shaft length body dimensions 76mm L x (32mm dia. x 25mm dia.). Make-before-break type. Superb for ladder stepped attenuators, balanced stereo stepped attenuators and stereo balanced TVC selector. Elma part number 04-4133." Happy to post it. I'll cover the cost. Pickup also available from Lindfield (2070). Photos:
  5. Further information: Gday, For sale is my custom built 15" Transflex subwoofer (https://www.diyaudio.com/forums/subwoofers/259509-sub-design-constricted-transflex-simple-build-series-tuned-6th-202.html#post5117336 - my build information starting at linked post and continuing over next few page). Driver is a Lab Eminence 15" 4ohm woofer, box is built from premium 12mm Russian birch ply and is tuned to 33Hz. This thing is huge and heavy, as such I am hoping to sell locally - outrageously deep, fast and sounds great at low volumes. Will just about pop a lung when cranked. Included is an appropriate amplifier for the sub - Behringer inuke NU3000. Selling as we have a newborn baby next door. Please PM with any questions. Attached are design plans and predicted frequency response. I am the builder and the only owner, more pictures of build process and driver specs PDF available on request. Item: Lab 15" 4 ohm special run transflex subwoofer + inuke nu3000 (both included in price) I'd prefer to sell all together at this stage, but if it's not moving I might consider selling stuff separately. Would be interested in a trade for Reloop RP7000mk2 or Technics 1200 (plus cash on my end). Should I sell anything, I will make a donation to SNA. I have extensive head-fi and ebay feedback if you'd like to see.
  6. Item: RJM Audio VSPS Moving Magnet DIY Phono Stage Location: Perth Price: Withdrawn from sale Item Condition: Working perfectly, some scratches on cases Reason for selling: Now using MC Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: Excellent sounding phono, used for six months, built about two years ago. The cases are thin Aluminium, but have brass or Titanium plates at connector points. Materials used: RJM VSPS and Dual-Bridge Rectifier kits, Dueland wiring for signal paths, Arizona Blue Cactus 2.2uF 200VDC output capacitors (with bypass caps), Altronics transformer, Furutech Rhodium FI-03 IEC inlet with fuse, 2 x Aluminium cases, Stillpoint ERS tape around power cable (light blue) in phono case, Gold coated pure Copper RCA plugs, 2 cm slate pieces under circuit boards and transformer, brass (front) and Titanium plates (rear). Well over $200 of materials used. http://phonoclone.com/diy-pho5.html http://phonoclone.com/pcb.html http://phonoclone.com/diy-guide.html ELECTRICAL DISCLAIMER This product has not been manufactured by a qualified individual or company, therefore contains electrical circuits that do not necessarily comply with Australian Standards. I understand that as the seller, I may be liable to repercussions in the event of equipment failure. By advertising and selling this product, as the seller I also agree that I am solely liable, and the publisher of this website takes no responsibility for any injury or death resulting from, whether directly or indirectly, any accident that may happen as a result of the failure of the product being sold. If in doubt, seek the services of a qualified electrician to inspect the product to ensure it is safe for use. Photos: Advertisements without photos of the actual item will not be approved.
  7. Item: 2 x Toroidal Transformers 160VA 2x20V Audio Grade Location: Sydney, Lindfield Price: SOLD Item Condition: Made in 2013 but never used, mint Reason for selling: Abandoned DIY project Payment Method: Pickup - Cash, Paypal Extra Info: I have for sale a pair of Toroidal Transformers. They are 160VA, 2 x 20V each. Made by Toroidy, great Polish manufacturer of high quality audio grade transformers. Selling both matched transformers together, so the price is for the pair. They could be perfect for a dual-mono or two monoblock amplifiers. I bought the transformers 6 years ago, for my DIY amp that I never finished. I did not even put those transformers in. Stored them packed in the box. So these are pretty much brand new. I did not have time to finish that project and do not need those two any more, so the sale. Some of the characteristics of the Audio Grade transformers by Toroidy: - additional magnetic and electrostatic screening - epoxy filled centre with M6 clearance hole in a potted centre for mounting - gum pads to eliminate transmission of vibrations - impregnated core and the windings - covered with a black Mylar tape - production process scrupulously controlled at every step - quiet performance and the highest electrical parameters - flex leads - GOSS band On top of that, my order had a couple of custom modifications: - doubled diameter of secondary windings - primary winded on secondaries Specs: Primary: 0-230V @ 50Hz Secondaries: 20-0-20V Estimated dimensions: 105mm diameter x 50mm high (plus 10-20mm for leadouts) Mounting: M6 clearance hole in a potted centre Leadouts: approx. 110mm long flexible (stranded) Weight: approx. 1.35kg each I’m happy to post anywhere in Australia. Pickup available from Lindfield (2070). Photos:
  8. For our October club meeting we are very pleased to have club member Bill Louey present his own highly modified home system including his DIY loudspeakers. Bill last presented his system to the club back in April 2012 – much of it has now changed and improved. Details of Bill’s system (details below were written by Bill)… Loudspeakers These are 3 way open baffle loudspeakers using dynamic drivers with active and passive hybrid crossovers. Open baffle loudspeakers have some unique advantages over conventional boxed speakers in that: · They don’t have an enclosed box so they have no box resonances hence no box colourations, · Their dipole radiation pattern reduces side reflections hence room interaction and increases the portion of direct sound over reflected sound in the room, and, · The first sound reflection from the wall comes from behind the speakers in the front instead of from behind the seat for conventional speakers, hence producing a more realistic, life-like sound. Open baffle loudspeakers are substantially harder to design due to sound wave cancellation, reduced efficiency and lobbing effects and usually require active crossover to shape frequency response and need multiple amplifiers to drive. Since open baffle speakers are much harder to sell manufacturers usually don’t make them, except with electrostatic loudspeakers. However, because of the greatest technical challenges and potentially the highest possible sonic result, open baffle speakers with dynamic drivers are the ultimate for loudspeaker DIY builders. Bill designed the crossover networks and has been tweaking them for 10 years now. He has only lately been very happy with the results and concluded the 10 year loudspeaker DIY project. CD/SACD/Blu Ray Source The source is a modified Marantz UD7007 universal player that plays CD, SACD and Blu Ray. Bill has undergone multiple revisions of his own upgrade over the years and has replaced hundreds of parts to change the player to suit his needs. He also changed the player from a Class II player to a Class I player in order to reduce the noise from the switch mode power supply unit. Preamp / Active Crossover This is a custom built unit designed by Bill to house the active crossover also to serve as a preamp. All buffer stages use OPA627 driven by an extremely quiet shunt regulator. Power Amplifiers Bill originally bought a DIY amplifier kit with conventional 3 stages, class AB, fully complimentary design. He later completely redesigned the printed circuit boards and incorporated a very quiet capacitor multiplier into the amplifier’s first two stages. He also designed his own very quiet and muscular power supply for the amplifier. These are MOSFET amplifiers rated 160W. 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/Bluray (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 13th October 2019 Doors open 1pm Meeting starts at 2pm Tom Waters President Sydney Audio Club W: http://www.sydneyaudioclub.org/ FB: https://www.facebook.com/sydneyaudioclub E: tomwaters@sydneyaudioclub.org.au
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