That was measurement limited, as you might have gathered reading the article; the caption you included shows that the preamp had better performance than the sound card I was using then. I've upgraded quite a bit in the nearly ten years since that was done*; I hope that perhaps you have more capability now than you did then. I have been frankly too lazy to post updated measurements since this was already way better than needed for inaudibility.
But nice try at sidetracking and avoiding giving data to support your assertion.
* I'm also on my fourth laboratory since then.
edit: It wasn't your assertion, sorry for saying that- it's hard to keep the nonsense straight.
I guess I don't follow. Say you comes are being loaded by the atmosphere during a humid day, and let's ignore the fact there so density gradient in your room from cone to wall. Does not this mechanical loading, a change in the effective mass of the cone , not change the electrical network. Also, the effects of this are relative to the volumetric displacement, I.e., a woofer is affected more than a tweeter. Under different conditions one set up might test and sound better and under others, worse.
speakers do vary alignment over environmental variations - so they would be expected to sound different from day-to-day if humans were able to make such comparisons reliably - which isn't possible for really small differences given the very few bits that get get stored in long term memory from our full sensory experience
4%
Yes, the resistance of the voice coil changes with temperature. This causes the frequency response and sensistivity of a loudspeaker to be different at high power, compared to low power, due to the heat dissipated by the coil itself. It's more of a problem with PA equipment than home audio, though.
If the high one is 1% high from nominal and the low one is 1% low from nominal, how do you get that?
Depends on the sensor type. There are analog, threshold and digital out sensors. Do you have a part number?
Kind horn an, power it up and bring a piece of metal close to the sensor . Look for a corresponding voltage change. Check this out for reference:
http://www.wellsve.com/sft503/Counterpoint3_1.pdf
http://www.wellsve.com/sft503/Counterpoint3_1.pdf
As long as open loop gain is high enough, it's a pretty darn good approximation. And thanks, godfrey!
Yes, heating voice coils can change the sound as well. I'm still not following that train of thought. Fortunately, I haven't overheated an MC yet!
- Status
- Not open for further replies.