Recent content by DonH56

  1. DonH56

    Stereo Bass using subwoofers

    I'm going to just give up on having an accurate system and stick with my el-cheapo party system with mono subs since the in-room response is much better and my ears of clay cannot tell the difference on 99.99% of the recordings I own.
  2. DonH56

    Stereo Bass using subwoofers

    Yup. Mine are run as a mono swarm, however... I figure not much chance of a 32' or 64' pipe sounding anything but mono in my room. I was referring to the post that said mono is for party people. Guess I fail.
  3. DonH56

    Stereo Bass using subwoofers

    I run mine in mono and am far from a "party mode" kind of guy... I listen mainly to jazz and classical, with some old ("classic") rock and country thrown in, as well as movies (mostly action type, some drama). How many subs are needed depends very much upon the room and desired SPL, natch. I...
  4. DonH56

    System-Wide SINAD?

    One example: DAC output is 110 dB SINAD at 4 V output Amp output is 100 dB SINAD with 1 V input If you just use the script or otherwise calculate the resultant SINAD, you'll find the answer is about 100 dB. But if you do the experiment at those levels, you'll find the amplifier has higher...
  5. DonH56

    System-Wide SINAD?

    If you already knew the answer, why ask the question? Unless you know the gains, signal levels, and contribution of noise and distortion along the signal chain, you cannot simply "combine" SINAD whether you use a Python script, hand calculator, or a slide rule. You can indeed measure at the...
  6. DonH56

    Trinnov Altitude 16 Review (AV Processor)

    HDMI 2.1 increases the video bandwidth, from 18 Gbps to 48 Gbps, and adds dynamic HDR or something like that, but AFAIK doesn't do anything for standard audio. Unless you are thinking of eARC? I don't use ARC so not sure about that.
  7. DonH56

    Class A vs AB -- Do They Really Sound Different?

    Not going there... ;) HP 331?
  8. DonH56

    Sampling problem around multiple frequencies

    IIRC, a frequency chirp in the analog domain does not modulate the amplitude. Sampling and applying an FFT results in frequency binning and waveform tails that affect the amplitude reported by the FFT. But it has been a long time since my radar days, and I was designing chips, not dealing with...
  9. DonH56

    Class A vs AB -- Do They Really Sound Different?

    @pma How do you know the higher odd-order distortion terms are explicitly from crossover distortion and not just normal increasing nonlinearity at higher power? When I did something like this in the primordial past, I kept the power output the same, and adjusted the output stage bias. When...
  10. DonH56

    System-Wide SINAD?

    SINAD = signal-to-noise-and-distortion ratio, often called THD+N in the audio world. You cannot really calculate the SINAD of a gain chain since it includes noise, which is usually uncorrelated and thus sums in root-sum-squared fashion (vn_total = sqrt(vn1^2 + vn2^2 + ...), and distortion, which...
  11. DonH56

    Slew Rate

    Simple answer: no. Since it is a pulse-width modulated output, sort of, very high slew rates are needed to avoid dead time/hysteresis in the output switching devices, but the signal bandwidth is set by the output filter network along with whatever you decide the input bandwidth to be. The output...
  12. DonH56

    Stereo Bass using subwoofers

    I have gone back and forth over the years and settled on mono subs with fairly steep 24 dB/oct L-R crossovers. Just not enough stereo content to bother, especially in a room not all that large, and as said above the directional info comes above the sub frequencies so a steep roll-off takes care...
  13. DonH56

    Slew Rate

    Ask somebody in Marketing, not me. :) I tend to agree with the posters above. High slew rate and ultrawide bandwidth were popular marketing differentiators back then, since "bigger is better", but they created as many or more problems than they solved. You need bandwidth well beyond 20 kHz for...
  14. DonH56

    Tasteful rigid fiberglass room treatment panels

    Acoustic fabric is an open weave to allow sound through especially at higher frequencies. I am no expert but you can probably find something that would work (no idea where you might have to order from). Tight weave, like for a bedsheet, will reflect more high-frequency sound, which may or may...
  15. DonH56

    Tasteful rigid fiberglass room treatment panels

    I used a utility knife to cut mine. Don't forget to wear gloves, and I wore sacrificial old jeans and a sweatshirt when I assembled my panels. You can get acoustic fabric in a myriad of colors to cover them to taste, or even have pictures (stock or your own) printed on the covers. You can build...
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