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All hail the wayback machine.

It'd be interesting to hear those, although I already know* that my system can convey LF envelopment. * to the extent that one can know from informal listening tests, anyway

I had seen this info before, but for some reason never thought much about how it might apply to my setup. Turns out that it fulfills the criteria around 45Hz or so: there's a lateral velocity maximum and a medial pressure maximum around the same frequency at the listening chair. Interestingly...

It's probably better to look at the correlation rather than the absolute level of the difference signal. Observing the filtered signals on an XY oscilloscope can be useful because you can visually estimate the correlation in real time. From what I've gathered, inter-channel phase fluctuations...

I've not personally looked at any classical releases on vinyl, but I don't doubt that at least some of them had stereo bass. The Mercury recording above is from the series of tape-to-digital transfers/remasters done in the '90s.

Here are a couple more low-passed tracks on an XY display, in case anyone is interested. First, an older Florence + the Machine song, "All This and Heaven Too" from Ceremonials (2011): Lots of stereo bass content below 80Hz throughout, which is somewhat unusual for a pop/rock/etc. song...

The story about Lorin Maazel in Thomas's paper reminded me of something: Some time ago, I was looking at some low-passed music tracks on a (software) XY oscilloscope. Several tracks from Dance Fever by Florence + the Machine have seemingly very deliberate inter-channel phase modulation in the...

Here's a pretty dynamic recording: Stravinsky - Three Greek Ballets (Naxos). Stats for all tracks: Channel L R DC offset -0.00012341 -0.00018903 Minimum -0.99499512 -0.81936646 Maximum 0.99948120 0.88305664 Peak level (dBFS)...

That mirrors my thoughts, hence why I designed the tweeter filter the way I did.

Good points to keep in mind if one intends to use it in a passive system. In this case, the power dissipation falls rapidly below 1kHz because the digital filters on the tweeter channel have a ~12dB/oct high pass response (see the third image in post #1). I use three 30Ω 10W resistors in...

In what frequency range does the distortion increase? Low driving impedance can be helpful at lower frequencies near the driver's resonance because the negative feedback afforded by the back EMF helps to linearize certain parameters. Assuming you have a little sensitivity to spare, you can try...

Not quite. Simply increasing the source/driving impedance while keeping SPL constant will in fact improve certain nonlinearities; namely those which modulate the voice coil inductance. This is because modulating inductance generates a voltage through the coil, which can be thought of as a...

I'm planning to try FSAF at some point. The residuals with and without the passive filters should be interesting and may give me a better idea of whether or not the improvements I hear are only in my head :). Just in case someone here is looking for it in REW: the current stable release...

You and I clearly have different interpretations of the data. Noise dominates at very low frequencies, so that's mostly what you're looking at below ~40Hz at 96dB and 103dB, or ~70Hz at 86dB. The 2nd harmonic is not strongly affected, but is generally slightly lower with the filters except...

Or just an R-L high pass filter. I don't recall having seen it used in a speaker previously, but I'm certainly not surprised that I'm not the first to think of it :). It just seemed to me to be the simplest and best way to achieve goal #1 in this application, especially since most of the...

Sort of. I'm not sure that damping is the correct term. A higher source impedance reduces the current from the error voltage. Consider the following simplified model: Zout is the source/driving impedance. The error voltage is produced within the driver as a result of nonlinearities in its motor...

A pertinent detail to remember is that the force generated depends on the current through the voice coil, not the voltage. Certain nonlinearities in speaker drivers—particularly the ones that tend to dominate in a driver's mid band—can be thought of as a voltage source in series with the voice...

I've been tinkering with my DIY speakers a bit to see if I can improve certain aspects of their performance (see this thread for more info on them). Previously, the drivers were connected directly to the amplifier outputs with all filtering done digitally, but recently I decided to experiment...

Just out of curiosity, what pins do the XLR caps actually short together? Pins 2 and 3 can be shorted with phantom power active (they are at the same potential), but shorting pin 1 as well may cause a problem. Yes, but there's little chance of it ever being a problem in this context. Even with...

Look at the unweighted crest factor of some "mastered tracks". Most pop/rock is around 10-15dB. Classical is more like 20-25dB, with some recordings exceeding 30dB.