I don't know what is a typical system, but in my case the gain in is plenty with R6 at 470R, which is according to Salas 1,94x. At least with my LCD-2 cans it's still almost too much. With my Genelec G3 active speakers I had only a short time to test and gain seemed to be quite plenty. In any case the sound is absolutely brilliant with total bass control and vibrant vocals and mid section. And I think it's getting better with more hours in it...
Now listening to good old Rage Against The Machine's first album by the way and I'm hearing new bass details I didn't know existed earlier. My DCG3 build is totally silent without any signs of hum even with ordinary cheap toroids without shielding. In fact Now I can hear in silent parts the interferences caused by my Raspberry Pi source, so I need to focus on that next.
Now listening to good old Rage Against The Machine's first album by the way and I'm hearing new bass details I didn't know existed earlier. My DCG3 build is totally silent without any signs of hum even with ordinary cheap toroids without shielding. In fact Now I can hear in silent parts the interferences caused by my Raspberry Pi source, so I need to focus on that next.
It uses a double winding rcore (2 x 18VAC) followed by separated rectifiers and smoothers that feed two positive V12R (modified).
The V12R are connected in tandem so I can get +-17Vdc out.
So this is not double mono but it works very well indeed. (IMO using two positive shunts with separated TX windings sounds better than the normal way using one positive and one negative shunt).
It was built with 3x gain and uses 50k log alps.
The V12R are connected in tandem so I can get +-17Vdc out.
So this is not double mono but it works very well indeed. (IMO using two positive shunts with separated TX windings sounds better than the normal way using one positive and one negative shunt).
It was built with 3x gain and uses 50k log alps.
Quite nice & unusual execution Ricardo, congrats 
Raw DC twin positive rails board from FSP, a Mezmerize type In-Selector, matrix built twin positive V1.2R shunts on virtual ground midpoint, twin pots (?), i.e. an imaginative building mix from you. Yes the phase shift remains linear in the audio spectrum. You caught it in the lab although I haven't referred to that detail 
Yamaha NS1000's I also see there, cool stuff.
Raw DC twin positive rails board from FSP, a Mezmerize type In-Selector, matrix built twin positive V1.2R shunts on virtual ground midpoint, twin pots (?), i.e. an imaginative building mix from you. Yes the phase shift remains linear in the audio spectrum. You caught it in the lab although I haven't referred to that detail Yamaha NS1000's I also see there, cool stuff.Yeah, I find that the BA-3 has almost too much gain for a normal power amp.
Seems like if you "breathe" on the volume control the wrong way it's either too loud or not loud enough.
Guess that's why Mr. Pass designed it to work with some of his lower gain power amps.
While it sounds quite good, I got tired of trying to adjust all those "overly sensitive" trimmer pots despite using 2k ohm for the higher ones.
Seems nothing would remain stable and everything was constantly changing based on the temp. of the outputs.
Plus, I prefer DC-coupled designs over coupling caps.
Someone needs to design a servo for it IMO.
Great news. Congratulations.
Nice with the LCD-2s as we were confident by their test data they will be driven well even with your milder bias/gain settings and so it went.
But its also nice to know its a success for you in another role too. I.e active monitors line level drive (through long cables in your setup?). Genelec is a very respected Finish company in the recording monitors sector. They are especially good in doing compact ones like that G3 of yours. Which I have listened to. But I also like their big three ways along those from Klein & Hummel. Do post some pics of your finished DCG3 whenever possible if you may.
with a gain of 3x in the pre-amp and 6x in the F5 you have a total gain of 18times (+25.1dB).
The maximum output of the F5 is ~14 to 15Vac
Your sensitivity for maximum power is ~800mVac
What are you using as your sources?
Quite nice & unusual execution Ricardo, congrats
Twin pots I always prefer so I can adjust level individually (like a balance without cross talk)
Not ready yet to post subjective impressions ....
Found a strange noise coming from the shunts (like the noise that sometimes comes out of an incandescent filament light bulb)... will measure currents to see if I am not starving anything.
PS: this noise does not appear on the output so it is mechanical... maybe the heatsinks of the shunts singing ?
Now I thought of something else... in a double bridges situation as you use, if the two secondary sections aren't well wound very symmetrical, or there is a phasing mistake in wiring, there could be overload of one section and mechanical hum from the transformer parts. Even so from bridge diodes themselves.