Well, if you had only 1 % of understanding basic physics as he has...
You would be happy as a young dog with 7 dicks.....
And your reason to doubt my understanding, qualification and experience is?
Your insult is puerile but demonstrates perfectly the source of your ignorance.
I added a magnet to the polepiece of the Dayton IB 15" woofer (one out of six) and gained 1.1 dB in sensitivity that means that the 200w chip amplifier get an extra "boost" of 60 watt to 260watt (for the same sound pressure), to do the calculation you can use this calculator: SPL Calculator i know you can´t hear 1.1dB increae in sound pressure but my brain knows that i´m better off then original!
I ordered more magnets today to the other elements. The transconductance amplifiers are almost finished and measurements will come soon. I will show you that the distortion is decreasing with "current drive" vs "voltage drive".
Where is the best place to store and link pictures?
I ordered more magnets today to the other elements. The transconductance amplifiers are almost finished and measurements will come soon. I will show you that the distortion is decreasing with "current drive" vs "voltage drive".
Where is the best place to store and link pictures?
Some measurements as promised (one corona-period ago) on MFB and CFB Dipole Woofer.
Happy to say that it works really good!
I have struggled to improve the phase margins at both LF and HF in order to maximize the feedback.
Reached approx 20-25dB in distortion reduction which i consider is enough.
However, once you have started to tweak an wiggle on the knobs, the optimizator nerd in me gets heavily engaged, must be somethin in my nature.
And the sound?
Playing a pure 30Hz sine wave goes from apperent (no MFB) to almost quiet (with MFB) at the exact same output level!!
I hope you get the point... higher harmonics tells you the direction of origin in the room. With MFB it dissapears almost.
Without all help from this forum, this project would not gone so well.
Specially thanks to: rscamp, chriscam, bolserst and joe rasmussen
Happy to say that it works really good!
I have struggled to improve the phase margins at both LF and HF in order to maximize the feedback.
Reached approx 20-25dB in distortion reduction which i consider is enough.
However, once you have started to tweak an wiggle on the knobs, the optimizator nerd in me gets heavily engaged, must be somethin in my nature.
And the sound?
Playing a pure 30Hz sine wave goes from apperent (no MFB) to almost quiet (with MFB) at the exact same output level!!
I hope you get the point... higher harmonics tells you the direction of origin in the room. With MFB it dissapears almost.
Without all help from this forum, this project would not gone so well.
Specially thanks to: rscamp, chriscam, bolserst and joe rasmussen
Attachments
Some measurements as promised (one corona-period ago) on MFB and CFB Dipole Woofer.
Happy to say that it works really good!
I have struggled to improve the phase margins at both LF and HF in order to maximize the feedback.
Reached approx 20-25dB in distortion reduction which i consider is enough.
However, once you have started to tweak an wiggle on the knobs, the optimizator nerd in me gets heavily engaged, must be somethin in my nature.
And the sound?
Playing a pure 30Hz sine wave goes from apperent (no MFB) to almost quiet (with MFB) at the exact same output level!!
I hope you get the point... higher harmonics tells you the direction of origin in the room. With MFB it dissapears almost.
Without all help from this forum, this project would not gone so well.
Specially thanks to: rscamp, chriscam, bolserst and joe rasmussen
Out of curiosity, playing sinwaves, what is your low frequency earing threshold ? From memory, mine is around 35hz.
For the Rythmik system to work the driver must have a special sensing coil. You cannot just use any old driver.
For OB, they do partner with GR Research:
http://www.rythmikaudio.com/GRci_OB.html
I am not sure they are working with DIYers anymore. You could contact them. If you purchase all the parts (amp+drivers) from them I do not see why they would not want to help you out.