Finished my build and am enjoying them as I type. I agree with avdesignguru's comments quoted below. For me, the best feature is the improved bass control. If I had a miniDSP version of the LXmini and didn't want to go analog, a good step would be to try to match the NP crossover in the miniDSP, especially for bass.
I wanted to take a minute and thank Nelson for this project and all the other DIY projects he has shared. I didn't know SL personally, but I followed his work over almost 40 years. I think its great that you and SL worked on this in the later days of his life. I'm sure it meant a lot to him and means a lot to us as well. Thanks for all the lessons, Prof. Pass.
Jac
I wanted to take a minute and thank Nelson for this project and all the other DIY projects he has shared. I didn't know SL personally, but I followed his work over almost 40 years. I think its great that you and SL worked on this in the later days of his life. I'm sure it meant a lot to him and means a lot to us as well. Thanks for all the lessons, Prof. Pass.
Jac
XLR mono block wiring question
Pardon if dumb question, but purchased second kit recently with intent of wiring to use xlr cabling. What's trivial to you all raises questions for me...been a long time since circuits class, and I got one of those other engineering degrees.
Just use one side of board for + i/o and other for -? Do I invert?
Lastly, would you advise against just running wire from RCA posts to xlr jacks as appropriate, starting from the board wired for the unbalanced i/o?
Pardon if dumb question, but purchased second kit recently with intent of wiring to use xlr cabling. What's trivial to you all raises questions for me...been a long time since circuits class, and I got one of those other engineering degrees.
Just use one side of board for + i/o and other for -? Do I invert?
Lastly, would you advise against just running wire from RCA posts to xlr jacks as appropriate, starting from the board wired for the unbalanced i/o?
LX Mini crossover
A question about the FET buffers used in the Lx Mini. Lord Pass (not to be confused with Lord Lucas, father of darkness
) has offered 2 different buffer circuits, one a pair of complimentary FETs, the other, incorporated in the first crossover kit, an FET with current source. Which one would be more suitable for driving long shielded interconnect cables and /or RC filters? Or do they perform the same?
Thx!
A question about the FET buffers used in the Lx Mini. Lord Pass (not to be confused with Lord Lucas, father of darkness
) has offered 2 different buffer circuits, one a pair of complimentary FETs, the other, incorporated in the first crossover kit, an FET with current source. Which one would be more suitable for driving long shielded interconnect cables and /or RC filters? Or do they perform the same? Thx!
Looking at the article carefully again, maybe I understand that the working current is about Idss/2. Maybe it should be a little lower. I use NI MULTISIM simulation. When using 2SK170, the resistance is about 27 ohms to 33 ohms. In fact, I will use LSK170, Idss is about 12 mA, need to test 6 mA source resistance to determine, estimated close to 2SK170.
Thank you for your reply! It points the way for my DIY. I misunderstood what you meant before. You instructed matching IDSS at 18-22 mA. In this article, the voltage on 100 ohm resistance is 0.7-1.0 V. It can be inferred that the working current is about 7 mA-10 mA, which is probably IDSS/2. I will also set the working current at 6-9mA. Thank you again for your guidance!
Thank you Mr. Pass. I really appreciate your inputs!
@mrdkai: yes I did many measurements on REW with my OB and been using miniDSP crossover. My OB works best at XO 125hz