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Everything posted by niss_man

  1. I thought there was going to be some schematic sharing in this thread.
  2. Nice vid and pics Pete. Appreciate that.
  3. What a nice rebuild. I've never seen anyone go to the trouble of electroplating the metal components before. Do you work in the electroplating business? Should look fantastic with all that shiny copper everywhere. Some nichicon fine gold caps would look nice in there with the copper parts as well.
  4. Taken from other diyfest/comp held in USA as an idea of how it could be done..... COMPETITION CATEGORIES DAYTON AUDIO Speaker project must use all Dayton Audio drivers in the project design. Any dollar amount or size is welcome. OPEN DRIVERS UNDER $200 (ANY BRAND, ANY TYPE, NO RESTRICTIONS) Projects less than $200 per pair to build ($ limit for drivers only). Speaker project can include any brand drivers. OPEN DRIVERS OVER $200 (ANY BRAND, ANY TYPE, NO RESTRICTIONS) Projects greater than $200 per pair to build ($ limit for drivers only). Speaker project can include any brand drivers. OPEN UNLIMITED Open Unlimited includes speaker projects that are active or cannot be categorized in the other 3 categories. If the speaker design has been entered in the Open Unlimited category, the same design without active components cannot be entered into any other category. *There will be 3 winners from each category MUSIC SELECTIONS TO BE USED IN JUDGING COMING SOON # Artist Title Category 1 Billy Idol White Wedding Open Unlimited 2 Talking Heads Burning Down The House Open Unlimited 3 Billy Joel Zanzibar (album version) Open Unlimited 4 Bonnie Raitt Silver Lining Dayton Audio 5 Michael Jackson Beat It Dayton Audio 6 North Mississippi Allstars Granny Does Your Dog Bite Dayton Audio 7 Nora Jones Come Away With Me Over $200 8 Marc Cohn Walking In Memphis (digital version) Over $200 9 Resphigi Pines of Rome Near A Catacomb Over $200 10 Tracy Chapman New Beginnings Under $200 11 Dire Straights So Far Away (album version) Under $200 12 Hugh Masekela Stimela Under $200 COMPETITION CRITERIA The judges will use the following criteria to determine the winners of the Speaker Design Competition: Craftsmanship (visual) Originality / Design (visual) Tonal Balance (audio) Clarity (audio) Imaging (audio) The speakers under test are driven with a music signal fed from a CD player to an Emotiva Stealth DC-1 preamplifier, with no upstream signal processing, crossovers, or equalization. The Emotiva DC-1's internal DAC and digital-domain volume control are used. The Emotiva DC-1's balanced line outputs feed a stereo Emotiva amplifier to power the entries. Designs featuring additional channels of amplification, active crossovers, equalization, or other processing (including DSP) are restricted to our Open Unlimited category. For systems in the Open Unlimited category, the available outputs from the source are balanced (XLR)/unbalanced analog (RCA), and optical Toslink. There will be 3 one-minute snippets of music listened to by the judges. These music selections are played per entry, each one minute in length, and these selections are the same for all speakers in a category, but different sets of tracks are selected for each category, with the selections for the categories having higher priced and more complex speakers being more challenging and possibly revealing of sonic flaws. Before each speaker plays, the level is set using pink noise, with SPL monitored via our calibrated Dayton Audio OmniMic V2 system, so that all speakers play at the same level. Each speaker will be evaluated and rated by the judges, then tabulated and results entered into a spreadsheet. These results will be combined with the audience submission votes to declare winners in the aforementioned categories. Judging sheets will be sent by mail to the designer's home address following the event. In the event of a tie within a class, the judges will select the ultimate winner. Please Note: Commercial entries or entities are prohibited: Individuals or entities that sell finished speakers (part time, full time, or any time) are excluded from registration. Should it be determined that you are in the commercial sales of finished speakers your entry will be removed. Please contact us should you require further explanation or clarification. Contest committee members will have final say whether a project is excluded or not from competition.
  5. Here is a link to midwest audiofest site for examples on what could be done, categories, music used, how it is judged. I see no problem with active speakers at all, the more in a competition the merrier. Price would be of consideration for an active system as well and should go into the "open"/expensive catagory. https://www.midwestaudiofest.com/speakerdesigncompetition.php
  6. Make sure to get plenty of off axis responses as well to get an idea of your power response and how well your crossover choices are doing.
  7. What do you mean considering. The police here in Qld have had the stingers as highway pursuits for a while now. I saw one yesterday when driving to the Leyburn historic sprints , he had pulled over a car in the oposite direction.
  8. I'd use the free program rew to do a sweep. It will tell you more than just singular frequency steps. You may find one of the tweeters has a dip in the frequency range where you tested but the rest is similar to the other speaker. If this was the case then the tweeter will only be matched at the frequency point where you measured and the rest may be out.
  9. Yes. It will be good to see the manufacturers spec from your own sweeps. It may or may not look like a good graph when done but it is what it is. Measure your speakers in the same spot under same conditions and see how they compare to each other. Then tweak with the pots as you suggest to get the best sound to your ears. I'd also measure a few off axis ones 15, 30, 45, 60 to check the off axis power response as well.
  10. I'd look at vw golf as well. Have owned mine since new. Now at 220 thousand km.
  11. What's the sound quality of the dac hat like?
  12. If you need parts, maybe Falconacoustics.co.uk can help.
  13. Love the engineering and build quality there. The elnas are great quality and resistors for that matter. All quality stuff in those beasts. You can see these were built for quality/sound and not just for marketing/profit like most stuff these days .
  14. I take it you didn't do any speaker measurements and are tuning by ear. That's all good, but you can't beat accurate measurements and a good crossover program. Final tweaks done by ear though.
  15. So long as the techs use the same value of caps and keep with the quality brands, it will be good. They can order everything that is needed. Btw have you tried looking on the Mark Levinson website for ML recommended technicians, maybe there is some info there.
  16. I don't wish to be rude, but why? That would be like taking your car to a mechanic who diagnoses a faulty cam chain tensioner, you then says thanks very much and take it home to try fix yourself. That's a bit disrespectful to the techs. The technicians will still charge you for their time to have a look at the amp and even then a quick look over maybe will still not find the root cause of your problem. I see only 2 methods, either get the schematics and try to fix it yourself ( you will need a fair amount of skill to fault find this amplifier if it is anything other than a simple fix) or get the professionals to do this. There is nothing worse than being a tech trying to fix something when you know some other person has been in there and made a shamozle of it and now expects the professional to fix their stuff up.
  17. Matty are those kit speakers or something you built from scratch? Have you got any measurements of them?
  18. The Zeus has actually got 8 of these 22000uf 100v caps in it. Total of 176000uf in the power supply. And another 2000uf each on the amplifier boards.
  19. @Sub Sonic Regarding one channel with less volume than the other. I reccomend checking the balance pot position to get even signal level between channels. Sometimes it only has to move only slightly for the channels to have good balance as I did find with my AU555.
  20. There is a good thread on how to make these measurements using REW software on diyaud https://www.diyaudio.com/forums/software-tools/338511-howto-distortion-measurements-rew.html You dont need a $30000 spectrum analyser using this method and it is easy to do. Even I had a go at it after reading that thread. As far as measuring musicality is concerned, I believe it would be very difficult to do but it should be able to be done. There would be so many more things involved than just a few distortion, harmonic and frequency sweeps though. For the hobbiest this would be nigh on impossible. For a large amp/speaker manufacturer this would be a fun thing to try and find out. Another thing, from an engineering point of view I believe we can measure all that we need (there is no magical juju). It is the interpretation of that info that will be the difficult bit. Simon Zeus
  21. What stunning photos@rickus
  22. Your local astronomy club should be able to help.
  23. I have recived interest from a local buyer who will pick it up this week. If the sale falls through I will get in contact with the next bidder.
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