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davewantsmoore

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davewantsmoore last won the day on February 14 2017

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About davewantsmoore

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    Log! It's big, it's heavy, it's wood.
  • Birthday October 16

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  1. davewantsmoore

    Just discovered Ohm Walsh speakers

    Ohm made some "special" shaped drivers, which have the basket on the outside (and so can't be mounted like a 'normal' speaker). You might be reading comments about those. For a 'normal' shaped cone driver... they are wrong. The only difference between the two pictures I drew is that one will have diffraction caused by the basket .... but that is only at relatively high frequencies, potentially above where you would crossover to a tweeter. The link I posted earlier has a lot of good practical info on the subject..... I agree with Linkwitz there are lot of advantages of his later version of the speaker ("LXmini") which keep the crossover point much lower by replacing the small tweeter in the "Pluto" version with a full range driver.
  2. davewantsmoore

    SDR V HDR on projectors

    Indeed .... but those projectors only output ~ the same peak level as SDR. So, you could achieve the same result (as HDR format video) with SDR format video, and appropriate calibration. If there was a difference between display of an SDR format video and HDR format video .... it is either intentional or accidental ..... but you could have achieved the same result using SDR video. That isn't to say "booo HDR get rid of it" ..... but just to point out that the result we get is heavily dependant on tonemapping.... and when you look at how tone mapping works, there are quite significant potential for problems vs what happens in the SDR world. A bit like applying EQ to a speaker. You can make it sound like anything you want, if you chose to. "Different" often tickles our preference, but it's easy to get a result which is an outlier..... OR, a bit like a CD vs SACD (or whatever). They should should the same, but it is easy to put out a SACD which has intentionally different audio. I can certainly understand why some people feel "hey! don't throw the baby out with the bathwater" about this ..... but it is hilarious that we have people dismissing this aspect ('this' being THE central issue to HDR vs SDR on projectors) as "absolute rubbish".
  3. davewantsmoore

    Music vs Audio?

    This comes up a lot over the years ..... it seems that some people get the impression that those who would look at improving their audio reproduction systems "objectively", eg. by looking at measurements of their amplifier or speaker ..... have somehow "lost touch" and are not interested in music any more. There is also a belief that the more you try to improve a reproduction system through such objective means .... the more you "kill the soul of it" ... or make it sound "sterile and not like real music". The thing is, you can try to follow "objective means" of building and improving a playback system, and you can completely ruin the sound.... and make it sound dead, lifeless, soulless, etc .... but if you do a good job of using those objective means to improve your playback system.... then you just uncover more of the soul of the music (that was in the recording, just obscured from you). I certainly don't design, build, measure speakers endlessly because I like listening to "audio" .... rather than "music". If anyone is using a technique to design/setup an audio system which doesn't result in "better sounding music" .... then they're doing something wrong, not matter what their justification for their method.
  4. davewantsmoore

    Just discovered Ohm Walsh speakers

    Yes, it is. FTR. Aside from diffraction from the basket/magnet ..... the sound from both the examples I drew is the same - my point is only that there is no need to remount a driver facing outwards, if you are looking to try the concept. In fact, as there won't be any diffraction from the basket/magnet, then if anything, you will get a better result. Ohm appear to mount the tweeter waveguide on the basket in some of their designs, so for them it's a neat way to do it - but isn't necessary to get omni directional sound. Some of their more elaborately shaped cone drivers are a different story, of course.
  5. davewantsmoore

    SDR V HDR on projectors

    The "nothing more than" part indicates missing the nuance of what is being said..... and have misconstrued it as "hdr bashing". The comments were provided with quite extensive justification ..... If you don't understand why people are saying what they are, then I'm sure they'll happily explain further.... but you've indicated that you don't want that. This wasn't made clear to me at all. Is that "why"? Are you saying that it is called "HDR tonemapping" because most projectors have less than 100nit of peak output? Tonemapping applies to any display which doesn't have a peak brightness = HDR format peak brightness .... ie. every HDR display.... not just ones which can't get brighter than SDR/100nit. There is more to the comments than just being stick-in-the-muds for the sake of it.... or being a mere "technicality". OK.... let's approach this from a different angle. Owen just replied, and is spot on ..... but it would be good if you would explain your perspective.... Using the example of a projector (let's assume to keep it simple that the projector has a peak output of 100nits) .... can you give us the quick version of why the bolded part above? What are things which would cause the SDR and the tone mapped HDR content to not look identical? Which of those "things" will actually cause the HDR content to look always superior?
  6. davewantsmoore

    No Dolby Digital from tv to avr

    There's your problem right there 👍
  7. davewantsmoore

    Just discovered Ohm Walsh speakers

    No. They are the same. So, if you prefered for some reason, not to have the basket facing outwards.... you can, as you get the same result either way.
  8. davewantsmoore

    No Dolby Digital from tv to avr

    If the suggestion above doesn't get it there .... then check setting in TV isn't wrong. Look for audio output = one of "PCM" or "stereo" or "downmix" ..... It should be "Bitstream", or "Dolby", or "pass-through", or similar.
  9. OP wants to pick up radio, not TV. Bob has the good oil. DAB is on VHF 9A vertical .... it might also get FM ok.
  10. davewantsmoore

    Deep End DIY - My first speaker project

    Nice charts 👍 Perhaps you're hoping for something you're never going to get ?! .... Are you looking at the red part of these peaks (and hoping they'll go away), or are you looking at what happens after 200ms or so. To prevent the peak in the response at these modes .... your room has to approach 'anechoic'. You'll need to apply EQ, but you have a computer as a sole source (yes?), so this should be a doddle.
  11. davewantsmoore

    Just discovered Ohm Walsh speakers

    👍 I thought it sounded like you might not point it up. If you are using a standard cone driver... then you can do it either way (see pic) it doesn't matter.
  12. Just in case it isn't clear (apologies if it is) .... The latency isn't reduced by using more processing power. Processing files "offline", yes .... but when doing it "live", the latency is (Ntaps-1)/2 .... and you either have hardware which can keep up with this, or you don't .... but using faster hardware can't reduce the inherent latency of (Ntaps-1)/2
  13. davewantsmoore

    Just discovered Ohm Walsh speakers

    Can you be more specific? Your comment makes it sound like you are just going to mount a driver backwards (ie. so the basket is facing out) in an existing speaker. The concept isn't simply to "flip the driver so the basket faces out". The concept is to point the driver up. Either the cone can be facing out, or the basket can be facing out, it doesn't matter.
  14. davewantsmoore

    Just discovered Ohm Walsh speakers

    Which model you going to try to reproduce? This is one approach: http://www.linkwitzlab.com/Pluto/intro.htm
  15. I use the digital input of the ncore modules .... so am only able to feed it data up to 4x rates.
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