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MartinC last won the day on May 8

MartinC had the most liked content!

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About MartinC

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  • Digital Source 1
    Pioneer PD S-505
  • Digital Source 2
    OPPO BDP-83
  • DAC
    miniDSP SHD
  • Power Amp/s
    Bel Canto eVo4
  • My Speakers
  • Trade Status
    I am not in the Hi-Fi trade

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  1. Bear in mind you'll still need to raise the speaker and microphone higher up or you'll get the ground reflection just as early as you would indoors. Using the IR Windows function.
  2. In order to see the speaker output distinct from boundary reflections you need to apply a time window, which can be longer with appropriate speaker and microphone position. I'm talking speaker on a chair more towards the middle of the room type of thing. I would not make crossover adjustments based on basic un-windowed in-room measurements at your listening position. Others like @Tony_J are better placed to help with this than me.
  3. How did you make your measurement? Results in the crossover region will be more sensitive to microphone position. My gut feeling is to leave the phase setting exactly where it is, unless ATC suggested otherwise?
  4. MartinC

    making a hi-fi rack

    I'd not worry about vibrations with any of that lot personally but if you really wanted to provided some isolation/damping then I'd suggest Sorbothane hemispheres as 'feet' for the components themselves. Other opinions are available though . If you updated you profile with your equipment list then everyone could see what the components you're trying to find a home for are.
  5. MartinC

    making a hi-fi rack

    Hi. Welcome to the forum . What components will you be putting on the rack? For most the construction decisions will be purely aesthetic. Turntables and possibly valve amps could be exceptions.
  6. MartinC

    Room measuring

    Hopefully none but the question is a complete straw man argument against the potential benefits of EQ to manage room mode effects. Not that I think @rabski has made any mention of EQ...
  7. I've just re-read that article which I probably fist came across a couple of years ago. I think much of it is very good, explaining amongst other things what I think are two key points: The benefits of applying a high-pass filter to the main speakers so that they principally just cover the 80 Hz or so upwards frequency range whilst the sub(s) do the rest. That in a typical stereo setup the signal from the main speakers will arrive before that from the subwoofer, and that no phase/delay control on a subwoofer can fix this. The solution is to apply a time delay to the signal sent to the main speakers. The two miniDSPs I own (2x4 HD and SHD) both allow these two things to be done. However, this is very much approaching the situation from the perspective of what is optimal. I don't think it's pointless adding a subwoofer if these things aren't done as there are huge numbers of very happy subwoofer owners who have not done so.
  8. This is not true. MiniDSP products give the user complete control to adjust the sound to their own taste. They are completely different to any fully automated 'correction' products that you may be thinking of, like say an Anti-Mode 8033 Cinema for subwoofer use.
  9. How long ago was this out of interest? I sadly have over 30 years experience of needing this done typically once a year. I think early on it was with a syringe but this was a very long time ago now.
  10. I'll add that I believe one of the issues with a genuine syringe style sporoach is the lack of control over the pressure, which a continuously running water pump provides.
  11. There is a low risk of ear drum perforation from 'syringing'* which is why some GP practices now no longer do this and patients are sent elsewhere for suction removal instead. The idea of anyone trying a DIY equivalent frankly horrifies me. *I'd be amazed if anyone still used a syringe. Electric water pumps have been used for as long as I can remember.
  12. Bear in mind this is only achieved if a filter is applied to limit the frequency range sent to the main speakers.
  13. I'll add that the crossover frequency I'm using is higher than I would be using if it wasn't for a phase matching issue with the main speakers but I don't notice an issue with localising the sub. My sub is behind and to the right of my main speaker which probably helps with this. If the sub was in say a rear corner I suppose I might?
  14. A key factor is the roll-off of the crossover filter. If this is set to 80 Hz this will be a frequency where the output has fallen off by a certain amount depending on the specific filter (so -3 dB, -6 dB etc). How fast it falls off beyond this point also varies significantly with the filter chosen. My point being that there is output from the sub above the set crossover frequency and how much is filter type dependent. I'm currently using a 120 Hz with a very steep fall-off (Linkwitz-Riley 48 dB / Octave) and this has less obvious higher frequency output than the much slower roll-off of the 80 Hz filter on my blu ray player. Ultimately this is a try it and see situation I think.