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Chris A

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Chris A last won the day on January 24

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About Chris A

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  1. Just finished this one yesterday. If you watched the series ("Chernobyl"), believe it that the book is even better, and the series was pretty darn good. The book makes the understanding of what happened much more real--and understandable. Heroes and villains aren't nearly as one-dimensional in the book. And the story is pretty different than the TV series. Chris
  2. The real advantage of the AMT-1s over the stock K-400 midrange horns/K-55 drivers is that you don't have to worry about the loss of vertical directivity of the midrange horn/driver like you do with stock La Scalas. So you can put the AMT/La Scalas just about anywhere that you wish and still get an outstanding center phantom image without having to use a lot of absorption around the loudspeakers. The SPUDs can go wherever you need to put them to get good LF coverage at whatever listening position that you choose. Just about any position where the AMT-1s are putting their output toward the center of the room (forward or rear) will work to provide coverage across the room. The only constraint that I see is the bass bin coverage above 200 Hz--that would probably need to be aimed toward the center of the living/listening space. Chris
  3. Yes, at subwoofer frequencies the required delays are pretty large (i.e., a half wave of delay at 40 Hz is 25 ms which also corresponds to 14 feet of physical offset). So if you're within 10-12 ms of being in perfect time alignment at that frequency, that's close enough. Chris
  4. My experience with the TH subs (one behind each Jub) is via use of two dedicated Crown XTi-1000s in bridged mode--one amplifier per TH sub. Note that this will give you too much power (about 1200 w), so you'll need to ensure that you've got the subs sealed up really well to avoid air leaks, and you'll also need to ensure that you're not over-driving your woofers in the TH subs--which can easily unload the cones (as I unfortunately experienced many years ago, and had to replace all four woofers eventually). The XTi-1000 amplifier has a DSP front end built into the amplifier, so all I had to do was use REW to equalize subwoofer output. The DSP crossover built-in can also limit the highest voltage drive level that you allow to go the the subs. I recommend reading up on that feature and using that capability to avoid woofer failures. The AVP that you own will help you with bass management, but I've found that I leave the subs on all the time, crossing at 40 Hz to the Jubs. I also use the extended LF response of the K-402-MEH in the center front location to extend and fill in the "anti-node" room modes in the room, and this works very effectively to smooth out the subwoofer response at the listening positions. There is still too much LF response at the walls of the room due to the nature of LF response in-room, but note that this setup is a good compromise for the LP response. Chris
  5. If you can setup the miniDSP 2x4 (as I assume that you've got on hand) with your A/V preamp/processor (AVP) and subwoofer amplifier without significant subwoofer hiss or saturation distortion, it should work well. The issue with the 2x4 (non-"HD") is lack of gain and higher noise floor. I'd set the crossover frequency of the subs as low as you can to eliminate the hiss and to limit the modulation and harmonic distortion of the subwoofer(s). Here is a video I just found that will likely help you out using REW measurements, and the video is focused on aligning and equalizing multiple subs. I haven't watched it all, but it seems to have the right topics in it: Chris
  6. The disadvantages of having to use U-235 is the biggest difference with the LFTR mentioned in the original video: that's the major difference. U-235 makes bombs (and so does P-239). Additionally, they are talking about using steam generation instead of gas turbine generation mentioned in the original video. There is a great deal of overhead associated with using steam generation. You can put a LFTR-type reactor (the original video) into the desert without dedicated water supply. That's a big deal. Here is a much more recent video of the current situation: Chris
  7. What do you need the XD over the XP to do? The price is at least 50% higher--perhaps 100%. Chris
  8. The KPT-942s (left, center, right) will take six output channels and three input channels. If you are only bi-amping the fronts (left, center, right), you'll need one Xilica XP-4080 and 12 total channels of amplification (including subs). That would mean that your surrounds and height channels (Atmos) would continue to be mono-amped as they are. If you are thinking about bi-amping the surrounds--they would take eight output channels and four input channels. That equates to an additional Xilica XP-4080 instead of one in the front-only bi-amping configuration, above. I have found that EQing the surrounds to flat SPL response is a really big deal. Getting the surrounds to flat phase response using bi-amping (left and right surrounds, but not left back and right back surrounds) is also audible for the best hi-fi surround music sources. It's not very audible on movies, however. The subwoofers take two output channels and two input channels, all handled without change from your current setup. ______________________________ I don't count the Atmos channels in this scenario because they are usually mono-amped channels used exclusively for movies. When music sources that require hi-fi operation of the height channels appear in greater numbers, that portion of the setup can be converted at that time. Chris
  9. 1) The XP series of crossovers have IIR filters and analog inputs (only). The XD series adds FIR filtering (albeit a limited filter length capability), and an AES/EBU input (digital): the costs are higher to reflect this added capability. The Neutrino series are Dante-compatible and generally are used in larger installations (a.k.a., "live sound") having multiple loudspeakers, inputs, outputs, network support and other DSP support. Generally, they aren't very good choices for home hi-fi requirements. 2) All DSP crossovers (that I'm aware of) have EQ, selectable crossover filter types, frequencies and filter slopes (orders), channel delay, fast limiters, compression, channel gain controls, and a buffer to store preset configurations on the crossover (with unlimited presets available via USB or Ethernet networking) and graphic EQ capability. Xilica "X" series have 8 available PEQ filters per input channel and another 8 per each output channel (input channels are assignable to output channels). They also provide a full 31-band graphic equalizer capability (which I don't use), and a capacity to store 30 different named presets on the unit. Chris
  10. One of the issues that the video raises is the apparent failure of the national decision-making system that led to the cancellation of the Oak Ridge LFTR efforts. I suspect that there were "national security concerns" (i.e., assuring the availability bomb-making P-239) during the height of the Cold War at that time. Also the U.S. Navy submariners under Rickover weren't exactly a "democracy in action" (in fact, quite the opposite). Lots of pushing and shoving of the nuclear power industry with regard to the weapons industry that apparently continues to this day. I once had the opportunity to remotely facilitate (via telephone) a series of meetings on strategies to do upgrades to a notable U.S. fission power plant (whose identity will remain unnamed here). I have to say that I'm grateful for not going into that industry early in my career. (I was facilitating the decision making as an employee from the Aerospace/Defense sector.) It was UNBELIEVABLE in terms of the gridlock and extreme low productivity at the site due to the draconian safety measures that had a stranglehold on the plant's maintenance and upgrade operations. I actually had Kafkaesque nightmares that ensued from just those remote facilitation sessions that lasted for months, i.e., no win--no way out scenarios. That type of operation of a power plant simply has to change--and I'm not optimistic that the NRC will ever get out of the business in order to allow a LFTR site to come into being. It's really that bad--in my experience. Chris
  11. Hastelloy was developed to address that problem in the Oak Ridge LFTR reactor--and that discussion is in the Amazon Prime version of the video (not sure about the YouTube version, however). There are more discussions on this: https://en.wikipedia.org/wiki/Liquid_fluoride_thorium_reactor Chris
  12. You'd be looking for a PA system or studio engineer type of person that dials in permanent installs for hi-fi sound. In the case of Mitch Barnett (the guy that does this sort of thing using the higher priced tools and hardware, and who took the effort to write a book on the subject: Accurate Sound Reproduction Using DSP), he is in the Pacific Northwest , IIRC. Here is his website URL: https://accuratesound.ca/ I offer my free services via email, i.e., the owner takes the REW measurements and emails to me, I email back the DSP crossover settings...and those folks within reasonable driving distance from my location (subject to current social distancing restrictions) I can support directly on-site. It looks like Mitch is doing the same thing I'm doing using remote measurements by the owners--looking at his website. Chris
  13. Please watch the video...before commenting. You'll thank me later. Chris
  14. Watch the film--to get the end of that story. It's happening now--just not in the US. Chris
  15. Too much information to briefly elaborate. The subject is "a much smarter way to get energy from fission than we're doing it now". It's safe, creates almost no dangerous wastes of the types that last thousands of years, and the fuel costs almost nothing..in fact, you'll get money back by using the element--because it's a by-product of mining neodymium and other rare earth metals. Best time I've spent watching something on-line in a long, long time. Here's a version of that same movie on YouTube (free of charge--albeit about 20 minutes shorter in overall length than the one on Prime): Chris
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