JLM AUDIO

Ok,i'm running the BA off a separate power supply. this is a mini PA/acoustic amp. I want to add a line out from the BA to go to an external mixer... but run the internal AMP as a monitor too. whats the best way? i think the BA can drive 2 inputs fine, but should I buffer them from each other in som...

whats the best way to run a BA off a AMP powersupply?

If I run it off one rail then my phantom power out will drop to 36V or so, can I run it from + and - 36v and drop the voltage by adding the regulators on the BAboard? or just a resistor and a zener each side to make +/- 24v?

I have upgraded my BANs with LM394s, seem to be quieter , and a bit more solid sounding, maybe less sibilant, more emphasis on the low mids.should I ground the case of the LM394s?

BC109C is much more expensive, is there an advantage?

is BC547C an ok substitute for BC550C?

oops yes sorry forgot to report. the pair is running active and sounding good, i'm using them and liking the results, tho it may be that some more tweaking would improve further i was using a 5mm element mic, i will try it side on sometime, will that really make a difference given that the element i...

yep i listened against the passive, I think the active is now undeniably better. the bass is faster and the whole thing is punchier and clearer (these were already by far the clearest speakers I have ever listened to regularly) I suspect that further small improvements could be made, but I'll use th...

heres a better graph of same thing. show still some dip but much better than it was. will work on making the extra tweeter cap switchable and see what that does... its a bit tricky to get at though.. http://greenmanhumming.com/12dB33n-better edit: here it is with the 33n in series with the 3,3k agai...

here it is with 33n and 3n on the woofers at approx 70cm

much better!

ok, the tweeter is probably already reversed deep in the box where i can't see then , because the dip is deeper when i reverse it.... i have 33nF but not 3.3nF caps I will see what I can dig up, or order more. i guess i could test with 3n made from 3x1n paralleled I guess i should order more differe...

um ok, i don't really understand why... won't 33n give the woofers a very much higher rolloff point, like 5k or something? is that much needed to fill the gap? is reversing the tweeter to compensate for the cap phase shift? not sure about time alignment of tweeter, it is mounted a little forward of ...

same thing, different scale

tweeter 12dB active

do you need the graph to show the level at 1k and lower too? (at expense of vertical resolution)

ok will do - yes i removed the series resistor, i think maybe my perception that the tweeter needed to come down may have been related to the gap in the crossover, and maybe once we get it right it won't need it anyway...

BTW changing to 12dB reduced my low level hum quite a bit. still more than the other channel though. is there a right and wrong way around to connect the inductor for shielding? I also replaced the inductor with an identical one so something might have changed there, hmm new inductor is same, but mo...