Recent content by DonH56

Unless you have severe RF interference, shielded speaker cables are unlikely to do anything sonically, and increase the risk of accidental shorts. As for the connections, much depends upon the amplifier topology. Some amplifiers cannot handle a grounded output terminal (either terminal, plus or...

What you and @SIY said and I want to third the statement in bold. It is not something worth considering for audio frequencies. RF Impedance is irrelevant at audio frequencies. The only thing that matters is resistance, inductance, and capacitance (RLC) and for interconnects among local...

25 ohms!?!?!?! Have not heard that, but since there are so many different "flavors" of RCAs, who knows? The ones I have measured have been around 75 ohms but it was originally designed as an audio, not RF, connector and so RF impedance was never part of the original spec AFAIK. Not until they...

RG58 is very similar to RG6 (or RG59) and is essentially equivalent for audio cables. RG6 is very commonly used for video cables, has slightly less loss at RF frequencies (decades above the audio band), and handles more current, mainly a consideration for satellite dishes that send DC along the...

Yeah, and even worse because the 1 kHz difference tones (at 18 and 21 kHz) are related to the third-order harmonic term so 60 kHz is also important. But it very much depends upon the circuit to determine the amplitude of the terms.

One thing I am curious about is how hard it is to see other aircraft since I assume you are under VFR? How crowded is the airspace? I'd be really nervous about missing a nearby aircraft.

IMD directly correlates to THD so no real need for a separate test. Explaining how and why IMD matters is a worthy subject; here is a start: https://www.audiosciencereview.com/forum/index.php?threads/harmonic-and-intermodulation-distortion.25436/

Nice work! Is 1 k-ohm a reasonable load for all of these op-amps? I do not know, curious, knowing 10 k-ohm is a typical lower value for most audio inputs (sans the unbuffered class D amp modules). I calculate 1.9 Vrms is about 2.7 Vpk so only about 2.7 mA (not accounting for any capacitance and...

I think this thread targets folk who have moved a bit beyond "Hello World" in Matlab...

Yah, done that, usually poorly. Much easier and better results using the proper tools. Now that means a $100 UMIK-1 and free REW software; back when I started, it was about $10k worth of equipment and professional analysis software. My usual simple technique was to play a tone at the crossover...

AVRs, at least the dozen or two I have owned, include a delay adjustment for time alignment. Phase alignment usually happens via the processor (room correction) program. There are many proponents of aligning the subs so the AVR/AVP treats them as a group. Strong opinions on both sides, group...

The RN1000A has only a single subwoofer output. Using a splitter to add a second sub means you will have to manually adjust the new subwoofer to align it with the other sub and the rest of the system. It will treat the two as a single subwoofer, which will not in general give optimal results...

Tariffs are protectionist, favoring local manufacturing, but of necessity inflationary when so much is imported. We pay large tariffs to other countries, probably far more than most folk realize. For decades companies for whom I've worked have been dealing with tariffs from the other side (as...

A single sine wave of 4.47 Vrms yields 5 W into a 4 ohm load. If you look at the individual amplitudes of 32 tones they are much less, thus the lower number provided for that case, but the RMS value will still be 4.47 Vrms for the product of tones. Setting the display to 0 dB for individual...

Too late. ;) You are comparing a single tone producing 5 W to 32 tones producing the same 5 W average power. Your conclusion is not valid because the math is not linear.