@erik_squires you may also find this article interesting (written by the chief engineer of ElectroVoice):
http://www.dissident-audio.com/Loudspeakers/CriticalLSDamping.pdf
http://www.dissident-audio.com/Loudspeakers/CriticalLSDamping.pdf
Measurements - Clearly Explained
@erik_squires you may also find this article interesting (written by the chief engineer of ElectroVoice): http://www.dissident-audio.com/Loudspeakers/CriticalLSDamping.pdf |
Here is a paper I just discovered an excellent paper on Damping Factor from Wikipedia: https://en.wikipedia.org/wiki/Damping_factor#cite_note-3 which also references a paper from Nelson Pass discussing how matching the amplifiers to specific speakers (lots of full-range and high efficiency drivers could be useful): http://www.firstwatt.com/pdf/art_cs_amps.pdf While the paper focuses on HE speakers and using current source amplifiers (i.e. very high impedance output) I think it's a great way to dive in deep into speaker / amplifier interrelationships. I'm not sure if I can create a current source amp in Xsim, but it is a fun challenge. :) Best, E |
Had does go on about the 2nd order harmonics inherent in this amp, and regarding "dogma," the entire SET (or SEP in this case) world has its own dogma it seems, and I'm all for it as it's a thing that has transformed my thinking about such things (although I've used relatively low wattage guitar amps for many years…including a hand made single ended amp with a tube rectifier). Regardless of all that, this amp "seems" to have less distortion of ANY kind at even louder levels, and the openness and apparent clarity may be the amp simply fooling me, which as long as I like the results is just fine. As Fremer said in a recent article, "my hearing gets worse, but my listening gets better," which certainly applies to my old person self as I continue to produce and mix concerts and play music. Had's new stuff since retiring from Cary seems like an assault on convention (and pricing), and if he makes a remote preamp I'm in with one of those too! Note no measurements are around for the Fire Bottle amp unless somebody else has tested one, but Had certainly measures things and his idea of what sounds good might just be the same as mine. |
The Dennis Had "Inspire Fire Bottle" amp I bought recently has NO specs anywhere I can find, except descriptions in his Ebay comments regarding things like output from various tubes and power supply design…I bought it because it’s cute (the first consideration by any true audiophile), and after reading 10,000 pages of comments here and there. Had says things like "You’ll be listening to your record/music collection as if you were hearing the performers for the first time. This jewell delivers the emotion of the music ... big time. The amp plays like a 50 watter with amazing control and slam." As far as my experience with it goes, he’s utterly correct. It works well with what I already have (preamp, DAC, cables, efficient speakers, etc.) so maybe I’m just lucky. |
Hi Everyone, I put together simulation files. If you have a PC or at least a Windows VM you should be able to grab the XSim crossover software (free!) and these files and play around yourself. http://www.diyaudio.com/forums/multi-way/307912-simulated-speakers-amp-z.html#post5081657 The simulation file I put together uses the Steroephile simulated 2-way load, and it is especially useful in examining how an amplifier’s output impedance affects the speaker frequency response. Of course, buy what you like to listen to! The docs I present here are merely to enhance our technical understanding and to accelerate the sharing of knowledge. If you want to play around with simulations, please join me over at the DIY site where we can attach images and files. Best, E |