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gwurb

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About gwurb

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  1. From your perspective are the active speakers replacing the middle passive price bracket speakers? Are you finding that people are preferring the actives to the top price bracket passives?
  2. Where did you buy it? How much was it? I have been wondering about one of those but the prices that I've seen seem really high.
  3. With people loosing jobs there will be less people buying luxury items. Maybe I am wrong but I think that it would be terrible for business to raise prices. In fact lowering prices may be a good idea. Maybe the people who spend a large amount of money on audio equipment are not going to care about price raises?
  4. Raising prices seems to be a very odd move when people are loosing jobs and the economy is going to struggle.
  5. Maybe it is a spin on instantaneous power. But that is not terrible. Depends how dynamic the scene is. If there is a lot going on in a short period of time then it would be a struggle but if there is enough time to recharge between events then it would work to keep the immersion. Interesting...
  6. Thanks for that. No op amps to be seen... I am Impressed that they are staying with FETs. I don't see how they can uphold the 70% guarantee with such a small power supply. 50*0.7*5/0.7>210 . That is assuming the amp is 70% efficient. I wonder if that 70% is instantaneous power. If it is then that is good marketing at work. What else could it mean...
  7. I would think you would want them at least at the edges of the couch in terms of 'width'. I was in a similar situation, doing stereo then 3.1, and then thinking of ways to get to 5.1. My surrounds are more like back surrounds. Maybe 20cm away from the corners of the seating. It's made a big difference upgrading from 3.1 to 5.1. I did get a way to run cables but if I had HEOS option then I would have probably chosen that as it would look cleaner. Maybe Yamaha has something similar to HEOS in their receivers with 5.1 support? Don't know. I would say try to stick to manufacturer technology and not third part wireless if you can. You would see better integration, especially if you are looking at a whole AVR as opposed to 3.1 to 5.1 upgrade needing a few wireless accessories.
  8. If you don't want to or can't run cables from the AVR to surrounds then there is an option of something like HEOS. The HEOS speakers would need power but have a wireless connection to receiver. That would enable more than 3.1 . Maybe you have no interest in that right now, but it might become a consideration for future upgrades.
  9. To add another comment. @Snoopy8 I agree with you; don't believe the hype in the marketing, especially when there are a bunch of omissions. It's been good to think about this. In case of that Marantz it seems that it measures in line with the marketing. But, until I see an official Marantz confirmation (via an official statement or schematics or something else concrete) I won't be completely satisfied that it's A/B class. So what does one base their buying decision on? Listening to the AVR in their own room/setup with their own speakers. As a bonus do it with and without a separate power amplifier. I don't think that will be possible for most people, unfortunately. It would be good to have more completeness and transparency in published information.
  10. RMS vs continuous? https://en.wikipedia.org/wiki/Audio_power#Continuous_power_and_"RMS_power" https://en.wikipedia.org/wiki/Root_mean_square#In_common_waveforms RMS is a calculation that is useful in theory and design and its really about a clearly defined waveform. Continuous sine wave output as measured in audio products has a THD component. Manufacturers can claim higher RMS with higher THD. As I understand it the standard for measuring audio output power makes the RMS and continuous terms interchangeable; I would think this is because they are close enough. I would need to look at the standard itself, not just wikipedia. Getting theoretical RMS out of a manufacturer would be fairly pointless, and it would be a waste of their time. If the standard was to be updated to use 'continuous sine wave output' terminology then it would be more accurate. I would read either terminology in the specifications to mean 'continuous sine wave output'.
  11. You have done a great job with the thread @Snoopy8. I will focus on the Marantz figures It is easier to focus on 1 manufacturer for me. SR7011: 710W power supply 125W per channel stereo claim 70% guarantee for 5 channels Testbench performance is in the table below Lets look at the power claims like this: Power Supply Rating - Amplifier Channels' usage - Remaining AVR circuitry and spare room (X) = Y Specifications: Stereo mode: 710 - 125*2 - X = 460 - X (plausible) 5 channel mode with 70% guarantee: 710 - (125*5*.7) - X = 437.5 - X (plausible) 7 channel mode: There is no guarantee and there are no other claims Bench performance: Stereo mode: 710 - 138.7*2 - X = 432.6 - X 5 channel mode with 70% guarantee: 710 - 104.9*5 - X = 185.5 - X 7 channel mode: 710 - 75.1*7 - X = 184.3 - X Marantz made a claim that each channel in a 5 channel output configuration will have a rating of at least 70% of the 2 channel output configuration. Does that mean that in a 5 channel output configuration the benchmark should never be more than 125*0.7=87.5W? Does the 104.9W measured mean that they are not using A/B class? Not necessarily. I could try and reverse logic some of the specifications: 75.1/0.75 (75.1W output with a highly efficient A/B class stage) =~ 100.133W ~100.133W*7 = ~ 701W 710 - 701 - X = 9 - X That seems highly unlikely! Does this suggest that they are using D class? Maybe or maybe not. I think the last piece of the puzzle is the power supply and the X factor. How honest are they in the 710W power usage? Is that the figure for 2, 5 or 7 channel output? How much power is needed to run the rest of the circuitry (other than amplification channels)? Maybe 9W is enough. I think the only way to know more is to have Marantz's design and/or take more measurements.
  12. Here is what I am finding curious right now about Marantz (only mentioning them as its who I have looked at in any detail): SR series claim to be A/B, and do use HDAM. At least the HDAM is setup in either B or A/B configuration. NR series can not be A/B and meet 70% guarantee with their power supply. Is it class D? Is the 70% guarantee not being met? I did ask if @surprisetech could post the schematics that he has for NR1508 or NR1501. Maybe they come from the service manual, and then I could look through to get a better idea. They may also be beyond my skill set but I would need to see them first. I do agree that marketing has too much at play here. Claiming big numbers is fairly easy when there is no required compliance, especially for cheaper products. A higher end AVR is expensive and if the cat gets out of the bag that its figures are over exaggerated then I would think that its sales would suffer. Lower cost AVRs have too many people buying without much care for actual proof of performance (other than listening) so its a prime area for marketing. What I think doesn't help is speakers. I had a look at the green shed at some of the old speakers and it was amazing to see so many older speakers that have a maximum rating of ~80W. I gave that a bit more thought and considered current speakers. I have seen System Audio make minimum power recommendations for their speaker: 50W. The overall speaker is rated to 150W. Is the speaker really that hard to drive? Its sensitivity ( rated indB) is not THAT bad. I have heard that speaker played with a 45W per channel stereo amp and I didn't find it lacking. So are they asking for 50W because they think that amp manufacturers over exaggerate power claims or because the speaker really needs that power? If the speaker needs that power then are we going for volume over quality? Are AVR manufacturers trying to give big numbers instead of accurate numbers because they think people will look at speaker recommendations and pass on their products? I'd love to see the schematic for the NR series amp to see whats inside. I do have access to NR1604 so I could look inside but that is no substitute for schematics.
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