That's most likely the SSID broadcast of your WiFi getting into the measurement.Ideas about what is going on with the wavy looking left side of the plot?
Tom
That's most likely the SSID broadcast of your WiFi getting into the measurement.Ideas about what is going on with the wavy looking left side of the plot?
That's most likely the SSID broadcast of your WiFi getting into the measurement.
Tom
any way to use a external EMI RFI?That's why I use EMI/RFI filters on the inputs of my products.
Tom
Yeah. Faraday cage and feed-through capacitors. Any wire entering the cage is an entry point for RF. Both from the hole necessary to get the wire through and from the wire itself. Recall antennae are just as good at picking up signals as they are at radiating them.faraday cage lol
For someone new to test equipment where would we recommend starting to get professional results for testing audio equipment so we can see evidence of good sound vs an ear on good sound? How much am I willing to spend, well that's TBD.View attachment 146215
Hello All,
I have been eyeing this Benchmark ABH2 power amplifier for several months. This last week I went over the edge. The big brown truck delivered it yesterday. The APx1701 test amplifier is not going away just sliding over to make room.
The AHB2 is cooled without a fan which is a huge plus. The goal is to get rid of the instrument cooling fans that may be adding noise to my speaker measurements.
The plan is to share the literal ins and outs of all the connections, microphone placements and the like. There is an assortment of load resistors and heat sinks coming next week. Also still to be purchased are “sense” resistors to measure voltage drop and calculate driver impedance phase and Thiele Small Parameters (included in the APx500 software)
I have some accessory Speakon cables that need to be fabricated.
First off will be testing of the Benchmark ABH2 with load resistors, the idea here is to test the amplifier with an assortment of different types of load resistors. Perhaps there is a difference among the load resistors?
There are a couple of 500 Watt cheap elevator braking resistors of unknown thermal coefficient (ppm/degree C) that need to be tested with the amplifier. I am thinking that at 5 watts, the standard test around here to test the THD+N and SINAD, that I do not expect to see much heat caused distortion caused by the cheap 500 nominal Watt resistors. Any guesses about THD+N and SINAD?
Thanks DT
Evidence of "good sound" is still subject to debate because the other side of this is the "audibility" of measured signals. Personally, I don't believe external electronic equipment (other than DSP driven room correction and crossover/driver optimization) above a certain grade makes a huge difference, other than offering tone controls. If everything within the electronic chain between source and speaker does its job, which is passing the signal to the speaker, the the sound "should" sound similar, but it does not. You have purposefully designed distortion from tubes which is arguably preferable to many listeners - so what's "good sound" now?For someone new to test equipment where would we recommend starting to get professional results for testing audio equipment so we can see evidence of good sound vs an ear on good sound? How much am I willing to spend, well that's TBD.
It's so hard to train your ear to know and understand what qualifies as great sound, there definitely is arguments these days that the old school sounds with noise are good. However, I like to do my comparisons against what you would actually hear in real life and the more detail, clarity, separation and range you hear should tell you something for those that understand. When you go to hear someone with a powerful, exception voice or playing an instrument that is what you should be listening for in your system. It's soo hard to train your ears for this but when you are extremely anal about sound you start to understand all of these concepts between what is good and bad without the debates in the middle regarding measurements. Of course we can't ignore measurements to a certain degree, they do matter to a certain extent.Evidence of "good sound" is still subject to debate because the other side of this is the "audibility" of measured signals. Personally, I don't believe external electronic equipment (other than DSP driven room correction and crossover/driver optimization) above a certain grade makes a huge difference, other than offering tone controls. If everything within the electronic chain between source and speaker does its job, which is passing the signal to the speaker, the the sound "should" sound similar, but it does not. You have purposefully designed distortion from tubes which is arguably preferable to many listeners - so what's "good sound" now?
There is also a heathy debate on OLED/MiniLED/QLED, IPS vs VA panels, etc. As you have been saying on Youtube The white screen test shows a ton on this subject, not to get off topic but the MiniLED's from LG do have issues with inconsistencies clouding, etc. I have tested just about every model. I can't bring myself to go with a Samsung as they pretty much act as large heating elements in your house (VA Panel drawbacks).Evidence of "good sound" is still subject to debate because the other side of this is the "audibility" of measured signals. Personally, I don't believe external electronic equipment (other than DSP driven room correction and crossover/driver optimization) above a certain grade makes a huge difference, other than offering tone controls. If everything within the electronic chain between source and speaker does its job, which is passing the signal to the speaker, the the sound "should" sound similar, but it does not. You have purposefully designed distortion from tubes which is arguably preferable to many listeners - so what's "good sound" now?