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  1. Mark Wilcock

    Rubber Washers for Flexy Rack--source for 3/4"?

    I made mine out of an old car inner tube. I made the outer hole by sharpening a short piece of 1.5 inch tube and jamming it on the chuck of a drill press (not turned on). Then I put a bit of wood on the drill press base and pressed the washers out of the inner tube. The centre holes where cut...
  2. Mark Wilcock

    Centre channel tweeter position?

    Hi all, I'm planning to build 3 (almost) identical MTM's for my left, centre and right speakers. The centre channel will be vertical, not lying on its side. On the left and right speakers I was planning to offset the drivers towards the inner edge of the baffle (like the adire 281, or Lynn...
  3. Mark Wilcock

    How close are Shiva's to their rated T/S specs?

    Peter, I wouldn't say that my measured results are very far off the Version 2 white paper parameters at all. As far as speaker drivers go the results are VERY close. (Way closer than the vifa and nht examples on the speaker workshop page www.audua.com) I'm just using some freeware and a...
  4. Mark Wilcock

    How close are Shiva's to their rated T/S specs?

    Peter: I put the various values for shiva drivers into SPSIM, which gives you the Q value for a sealed box. To get a Q=0.6 sealed box response using: 1. Dumax results for Shiva Mk 1 from version 1 white paper fs=21.61 hz Qts=0.376 Vas=136.6 litres Box volume = 88.5 litres = 3.13cuft...
  5. Mark Wilcock

    How close are Shiva's to their rated T/S specs?

    Sorry about the delay, but I couldn't connect to HTF last night (Melbourne time) Julian: I made the wallin jig 2, I had also made the first version. I have also built Eric Wallin's microphone preamp using a Panasonic mic capsule. I used a 61 litre sealed box to test the drivers, and broke...
  6. Mark Wilcock

    How close are Shiva's to their rated T/S specs?

    I tested my pair using Speaker Workshop I got: Speaker 1 qtc = 0.423 fs = 20.825 hz vas = 150.546 litres Speaker 2 qtc = 0.426 fs = 20.682 hz vas = 157.940 litres This was just me mucking about with my computer, not a proper lab, but the results are pretty good. The slight variations...
  7. Mark Wilcock

    Anyone tried the Marchandelec Active Crossover?

    Peter The Project 09 description on the ESP site is just an introduction. When you buy the board you get much more detailed circuit layout/construction info. The ESP circuit board has provision for volume control for every output (which can be bypassed if necessary). It also has input...
  8. Mark Wilcock

    Anyone tried the Marchandelec Active Crossover?

    I built a 3 channel, 3 way crossover, you may not require something as complex, it cost almost $A400 all up. The circuit boards were about A$25 for the crossover each and about $20 for the power supply board. One crossover board will do a stereo 2 way crossover, or mono 3 way. The case is...
  9. Mark Wilcock

    Anyone tried the Marchandelec Active Crossover?

    Have you checked out Rod Elliot's website? Link Removed Check out the active 24db L-R crossover. Link Removed Also check out the article 'Benefits of Biamping, not quite magic but close'. Link Removed I've built this crossover using his circuit boards, and they sound fantastic. He's in...
  10. Mark Wilcock

    DIY Center channel crossover help!

    Hi Patrick, I'm no expert, but I think your heading up the wrong path. If you add another midrange you should recalculate the values for the relevant lowpass cross depending on whether you connect them in series or parallel. You are going to get either a 4 or 16 ohm load for the midranges, I...
  11. Mark Wilcock

    To Biamp or not.

    Go DIY! I built 24dB Linkwitz-Riley active crossovers using circuits and PCB's from Rod Elliot's site (the link Greg posted above). John Pomanns site is great too. members.xoom.com/activecross/index.htm The results are amazing. It is the biggest improvement in the sound I have ever made...
  12. Mark Wilcock

    Another Flexi Rack & an Active Crossover

    Terry Thanks a lot! Actually the TV shelf is not braced. I built another shelf that doubled the thickness of the shelf under the tv, but after (careful) load testing I found that I didn't need it. The shelf deflects less than 2mm (about 1/8" I think) with the weight of the TV. I tested it by...
  13. Mark Wilcock

    Another Flexi Rack & an Active Crossover

    Andy, it took about a month to build. I designed it on the CAD system at work (it' great for enclosures as well, in fact I have my whole HT room modelled - whats work for after all?). I built it at my father-in-law's boat building factory. A professional particle board saw cutting easily...
  14. Mark Wilcock

    Another Flexi Rack & an Active Crossover

    Yes Chad, I applied veneer tape to the edges, it took ages. The rounded corner was done with a router, using a template made from rough plywood and a router bit with a ball bearing on the bottom, which presses against the template. I spent ages going through all the archived pages and other...
  15. Mark Wilcock

    Another Flexi Rack & an Active Crossover

    Here are some pictures of my Flexi Rack and Active Crossover. www.bluemarine.com.au/mark Check out the yachts while your there. The Rack is made out of Tasmanian Oak veneered MDF. I angled the sides back so it didn't look so boxy. I made rubber washers out of an old car inner tube, using...
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