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  1. DonH56

    RIP member Scott Wurcer

    He's a major loss, R.I.P.
  2. DonH56

    Front wall vs back wall

    Most speakers fire forward (so no HF energy directed at the front wall) and the front wall is usually far enough away that tertiary reflections are not so troublesome. Reflections off the rear wall near your ears, assuming you sit closer to the rear than to the front, are more likely to be...
  3. DonH56

    Bridge

    Assuming it really is the one in the pix, the usual way would be to move the switch to bridged/mono and connect speakers across the two red terminals.
  4. DonH56

    Magnepan LRS Speaker Review

    He asked about tube amps. I'll let you grammar experts debate the rest. I think mine were driven about 50/50 over their lifetime with tube/SS amps. Both worked fine, though bass was better with the SS amps I used.
  5. DonH56

    Magnepan LRS Speaker Review

    Tube amps and Maggies are a great match because Magnepans' impedance is pretty flat across the frequency band. They are insensitive so do need more power than many speakers (though my current conventional speakers have similarly low sensitivity, and much wider impedance variations). I drove a...
  6. DonH56

    McIntosh Transformer causing noise in speakers while disconnected.

    Good work, John. I think mounting the toroidal transformer vertically is key, so the radiated field is to the sides instead of up and down as it would be when mounted horizontally. Someone forgot basic EM theory and radiation patterns.
  7. DonH56

    Why Biquads?

    Well, I do not know how exactly miniDSP implements the filters, but should not be any underlying technical difference if they are both biquad structures. My guess is they are the same filters with two ways to input the coefficients: direct biquadratic terms, more useful for computers to skip...
  8. DonH56

    McIntosh Transformer causing noise in speakers while disconnected.

    Old article on "linear"" power supplies: https://www.audiosciencereview.com/forum/index.php?threads/power-supply-101-linear-supply.45884/ (I'd forgotten about this one.)
  9. DonH56

    McIntosh Transformer causing noise in speakers while disconnected.

    The strongest spike I see is at 120 Hz in that plot?
  10. DonH56

    McIntosh Transformer causing noise in speakers while disconnected.

    I like this idea, but didn't mention it because significant DC would usually cause the transformer to buzz as well. Toroidal transformers are much more sensitive to DC offset than conventional EI types (no gap in toroids). A DC blocker could be worth a try... Different comment: It looks like a...
  11. DonH56

    Grounding Issue from Connecting my Class D Hypex Amp to Subwoofer's Speaker Level Inputs?

    I am not a fan of running the main speakers full-range and using high-level subwoofer inputs but the topic has been beaten to death here and elsewhere. One fairly simple solution I have used in the past is to stick resistors of 100 to 1k ohms in series with all four wires to the sub. That is...
  12. DonH56

    Why Biquads?

    Thanks, I assumed so, but did not know (and too lazy to look it up). I knew some boards/products had FIR capability but I have not looked at them in a while. Considered getting one to integrate my subs with MSO but so far just letting my processor do it.
  13. DonH56

    Why Biquads?

    I don't have a miniDSP. Are those filters also implemented with biquads?
  14. DonH56

    Bi-amp front speakers with receiver (internal) and external integrated amp?

    I use ca. for circa FWIW. In English: ca. = "about" or "approximately" e.g. = "ergo" = "for example" i.e. = "that is" (exact, not approximate) etc. = "and so forth and so on" Pretty much the extent of Latin I remember aside from a few esoteric terms from my pre-med days in college (and...
  15. DonH56

    Why Biquads?

    A biquad is an IIR implementation so I do not know how it differs from "regular PEQ IIR" filters. Biquads are easy to implement (in several forms) and have fairly simple terms (since it's a biquadratic equation) making it easy to port among different DSP systems. Cascaded biquads are often used...
  16. DonH56

    McIntosh Transformer causing noise in speakers while disconnected.

    Can you run an FFT on that? The spectral information would be useful to us and to McIntosh.
  17. DonH56

    McIntosh Transformer causing noise in speakers while disconnected.

    Sounds like 60 Hz and harmonics from the power supply to me. The amp has a toroidal transformer which should reduce its radiated field, and is enclosed in its own shield (box), but there are power supply rectifiers and such that will generate high-frequency hash. I agree with the others; I would...
  18. DonH56

    Soaring

    My wife requires oxygen at home (7500') but her levels are usually OK at her workplace (6000') so it would be an interesting thing to know. Altitude sickness kicks in hard around 10,000' for most people but can begin to exhibit at 5000' or less in some folk. Passing out or just getting sick in a...
  19. DonH56

    Bi-amp front speakers with receiver (internal) and external integrated amp?

    NP You can look at an online calculator to assess SPL vs. input power for a given loudspeaker sensitivity, listening distance, and placement with respect to walls (boundaries). But you don't even really need that for this. You can ignore loudness curves for an initial approximation, and for a...
  20. DonH56

    Bi-amp front speakers with receiver (internal) and external integrated amp?

    Amplifier power need not be the same for all drivers, and generally is not, but net gain should be. At least for a conventional speaker system that assumes constant gain for all frequencies, such as a speaker designed to be driven by a single amplifier. If you utilize the high/low terminals for...
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