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bmc

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Everything posted by bmc

  1. Have a read of this https://www.audioholics.com/audio-amplifier/impedance-selector-switch-1
  2. I've found the Sony Netflix app to be a bit flakey (sometimes freezing at 25% or dropping out at the start of playing a show). Usually I just switch to an attached Chromecast Ultra when the app has issues. However, since finally getting a decent internet connection the app has been operating fine.🤞
  3. Factory settings reset: https://usa.yamaha.com/support/faq/audio_visual/9346.html
  4. Personally, I don't feel that my contribution has been welcomed at all and I will not be revisiting this thread.
  5. Only the first paragraph in quotation marks is from Wikipedia. https://en.wikipedia.org/wiki/Clipping_(audio) I wrote the rest. I chose not to make a sweeping statement about an entire class of audio product. To me BS is an outright lie. Figures quoted in this manner are not lies, but I agree they are designed to portray the product in a favourable light to influence the uninformed. I'm not sure what your point is here.
  6. From Wikipedia: "When an amplifier is pushed to create a signal with more power than its power supply can produce, it will amplify the signal only up to its maximum capacity, at which point the signal can be amplified no further. As the signal simply "cuts" or "clips" at the maximum capacity of the amplifier, the signal is said to be "clipping". The extra signal which is beyond the capability of the amplifier is simply cut off, resulting in a sine wave becoming a distorted square-wave-type waveform. Amplifiers have voltage, current and thermal limits. Clipping may occur due to limitations in the power supply or the output stage. Some amplifiers are able to deliver peak power without clipping for short durations before energy stored in the power supply is depleted or the amplifier begins to overheat." With multichannel amps each channel draws what it needs form the power supply. When the total drawn by all the channels reaches the maximum capacity of the power supply you get clipping. There is no "allocation" of power. Cheap AVRs will have an inexpensive power supply which may be able to run 2 channels to a decent level but will be unable to run all channels at that same level. More expensive AVRs (Arcam) will have bigger power supply which will enable all channels to run at a high power level simultaneously. They will produce even more power per channel if only running 2 channels (subject to output stage and thermal limitations). Naturally cheap AVRs specs won't quote power with all channels driven as it will be a low figure. They might also quote power into 6 ohms instead of 8 ohms, at just 1kHz instead of 20-20kHz, and with high or unspecified distortion levels. Not exactly BS but not very informative. You can use the max power consumption as a rough guide to the capacity of the AVR's power supply, keeping in mind that different amp classes have inherently different efficiencies (i.e class A/B 60-70% efficiency, class D over 90%) and hence different power supply requirements.
  7. I'm not sure what you mean by smart re-allocate power. The limiting factor is usually the amps power supply. Each channel draws what it needs from the power supply. If some channels are not operating that leaves more power supply capacity for those that are. All AVRs using a single power supply will produce significantly more power per channel into 2 channels than 5 or 7 or 9.
  8. The specs given by Yamaha for the RX-V3073 are pretty clear Rated Output Power (20Hz-20kHz, 2ch driven) 150W (8ohms, 0.06% THD) Those for the Powernode are somewhat vague 60 Watts x 2 into 8 ohms i.e no frequency range or distortion level given. The Yamaha will definitely deliver significantly more power in stereo mode and plenty to drive Dynaudio Emit 20.
  9. The LSX has a hi-pass filter adjustable from 50-120 Hz for use with subs. Also, though I've seen pictures of damaged LS50 base drivers which have been overdriven, but I'm pretty sure the active LS50W and LSX use DSP to prevent this.
  10. Surely this wouldn't be a problem if the bass was filtered off and sent to the subwoofer(s).
  11. The ones I use are a similar design but fully insulated. Love 'em. https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com.au%2Fulk%2Fitm%2F303088736927
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