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  1. Nyal Mellor

    Acoustic Frontiers presents "The Bass Optimization eBook"

    Klaus....whilst room dimensions are not the be all and end all, they are a very sensible starting point. If you can optimize the room mode spacing then it makes your life a lot easier when it comes to speaker / listener placement, acoustic treatment, EQ, etc. You end with more even spacing of...
  2. Nyal Mellor

    Acoustic Frontiers presents "The Bass Optimization eBook"

    Thanks for reading and detailed thoughts. 2. I maintain that if you have flexibility there is STRONG worth in optimizing room dimensions, it just produces a better starting position for the room, with less room mode issues due to better SPACING of the modes. I've had experience trying to...
  3. Nyal Mellor

    Acoustic Frontiers presents "The Bass Optimization eBook"

    80Hz, pretty much :)
  4. Nyal Mellor

    Acoustic Frontiers presents "The Bass Optimization eBook"

    Please have a read of my first eBook! It's about optimizing bass, and covers a number of areas including room construction, acoustic treatment, multiple subwoofers and equalization. It's not intended to be a super technical and definitive "manual", more a high level overview of the things that...
  5. Nyal Mellor

    Acoustician in NE (Philadelphia area)

    Thanks Len. The Room Acoustic Analysis service (room measurement) is after you've built the room. For new build rooms the process is something like: dimensional optimization, low frequency optimization (speaker / listener position optimization, multi-sub array positioning), sound isolation (if...
  6. Nyal Mellor

    Acoustic Drywall Sound Absorption vs. Transmission

    Yes, single layer, but IT MUST BE DAMPED!!! Otherwise it resonates at a few frequencies, ringing on after the excitation has stopped, screwing up your bass. The hat channel and clips actually makes the wall even floppier, as it reduce the number of anchoring points, and those anchoring points...
  7. Nyal Mellor

    ROON and DRC Software

    I wish every single integrated amp or pre-amp had good DRC. IMO that's the right place for it in the signal chain.
  8. Nyal Mellor

    Active crossover speakers/systems - what are current options?

    ATC. Many active options: 19AT, 40A, 50A, 100A, 150A, 200A, 300A. e.g. http://atcloudspeakers.co.uk/hi-fi/loudspeakers/tower-series/scm50asl/. They have two levels of amp pack for everything 50 and over. The standard amp pack and the fully discrete "anniversary" amp pack. Honestly one of the...
  9. Nyal Mellor

    Jbl 4367

    Curious as to the cause of the 35Hz null. My understanding of the source/sink method is that the rear is delayed and polarity inverted, therefore the two subs, if identical, should be in full time alignment over their operating range. There shouldn't be any phase cancellation nulls, at least...
  10. Nyal Mellor

    Jbl 4367

    You'll be getting the "lite" version of that when we do your low frequency optimization :) Single seat rooms, or even single seating row rooms, especially ones that are rectangular or mostly rectangular are pretty straightforward to optimize, or don't even require optimization. Some...
  11. Nyal Mellor

    Jbl 4367

    Please elaborate!
  12. Nyal Mellor

    Jbl 4367

    Welti or source / sink? Two different setups...
  13. Nyal Mellor

    Torus RM 15+/RM20 vs Shunyata Triton 1

    As a Torus dealer, let me clear this up... The AVR keeps the output voltage consistent by means of switching "taps" on the secondary side of the transformer. The switching is accomplished via relays. That is the clicking you hear. I'd be surprised if the relays switch at all, or at most a few...
  14. Nyal Mellor

    Mola Mola Makua Pre-DAC

    Check out Crooked Colors as well: https://soundcloud.com/crookedcolours. Lots of great bands coming out of Australia / NZ. ** ALSO NOT COMING TO SF!!! **
  15. Nyal Mellor

    Mola Mola Makua Pre-DAC

    This I fully agree with. Especially challenging for any system is highly compressed rock / pop music. The sound changes hugely from almost unlistenable to 'wow, I like this' when you step up the chain of equipment quality. A system that can't play back this type of music and sound engaging has...
  16. Nyal Mellor

    Jbl 4367

    They ARE very similar, both using a constant directivity design for the upper part of the frequency range. An explanation in my blog article on constant directivity horn waveguide speakers. Main difference I know is that the JBL waveguides are wider dispersion than the ones that Geddes uses.
  17. Nyal Mellor

    Jbl 4367

    Devialet D-Premier (previous generation)
  18. Nyal Mellor

    Jbl 4367

    Yes, he does talk A LOT :) BTW Songkick is good but none of the bands I like tour. Maybe I like weird music.
  19. Nyal Mellor

    Jbl 4367

    No, I don't think so, at least not the S-Spec version. They don't sell any S-Spec stuff to third parties. It's interesting to me because I am very into speaker off axis related stuff, and have written many blog articles about it...
  20. Nyal Mellor

    Jbl 4367

    Talking of driver developments that have taken a long time to reach market, ATC's new tweeter was 6 years in development. It's a dual suspension design with no ferrofluid and a very powerful magnet (2.0T). http://atcloudspeakers.co.uk/2015/06/. Sounds amazing, though of course I am biased. I...
  21. Nyal Mellor

    Jbl 4367

    Have you heard Devialet? Lovely warm sonic signature like a Class A amp has but with the control of a Class D.
  22. Nyal Mellor

    Destructively Driving Modes

    It's precisely the phase shift of IIR I was suggesting you take advantage of with the all pass filter, but nevermind. As to the rest of your plan, seems good. And maybe now you only need 2 subs you can use the Devialet D400!
  23. Nyal Mellor

    Destructively Driving Modes

    Why not IIR (all pass filter)? Though maybe the phase shift has to be over too narrow a frequency band for that?
  24. Nyal Mellor

    Destructively Driving Modes

    My understanding (not having spoken to them directly about it) is that they are using a general purpose CFD physics program with a specific purpose written optimization model. We're just using Boundary Element Modeling with manual optimization. It's been working well especially for multi-row...
  25. Nyal Mellor

    Destructively Driving Modes

    There is software, it's just not easy to use...see the BEM graphs I posted earlier. KYDG also has a more sophisticated tool called FLO.
  26. Nyal Mellor

    Destructively Driving Modes

    You could introduce a DSP phase shift filter on the rear sub to do a 180 degree phase shift over a certain frequency range...?
  27. Nyal Mellor

    Destructively Driving Modes

    Another good article - Multiple Subwoofers, Benefits and Setup And this paper is also relevant re: target curves “Listener Preferences for In-Room Loudspeaker and Headphone Target Responses”, S. Olive, T. Welti and E. McMullin, AES convention paper 8994, Oct 2013.
  28. Nyal Mellor

    Destructively Driving Modes

    So finally you realize digital delay is not necessary to get good response for a subwoofer array, like I have been telling you for years? The only delay that is really critical is the ability to delay the mains relative to the sub array. It's interesting that there are multiple approaches to...
  29. Nyal Mellor

    Destructively Driving Modes

    But in the final analysis the one they recommend were playing same signal to each subwoofer, right?
  30. Nyal Mellor

    Destructively Driving Modes

    I shouldn't be on your back about it really, because it's great to have people experimenting with this stuff! One very cool thing I've been meaning to do a video on for a long while is how when you do the mode cancellation if you play a sine wave at the cancellation frequency you turn the...

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