Pass Labs B4 crossover questions

[Soundhappy]

Analog XO/EQ

🙂

 

[mbrennwa]

Analog XO/EQ

🙂

Is this the same board that will come to the diyAudio store?
What are the dimensions?

 

[Soundhappy]

Mr Pass is knowing all the answers

 

[Soundhappy]

Look at one prototype. Photo courtesy NP

 

[mbrennwa]

I would be interested in the board dimensions (numbers), not just photos. Could anyone in the know please post these?

 

[Zen Mod]

it is (almost) free ....... so give him time

 

[wcwc]

I would be interested in the board dimensions (numbers), not just photos. Could anyone in the know please post these?

There was mention of it fitting in a 2U 230mm wide galaxy enclosure.

 

[R-K Rønningstad]

Feeding frenzy for greedy boyz soon, ZM. Pl

 

[RogerGustavsson]

The picture gives a clue, the RCA connectors have an outer diameter of about 9 mm. The PCB is probably 127 by 127 mm.

 

[Nelson Pass]

The initial board, which supports the LXmini and will also do biamped full
rangers in open baffles is 5" square.

 

[RogerGustavsson]

I was spot on then!

 

[mbrennwa]

Thanks!

 

[R-K Rønningstad]

Is the third JFET stage in the B4 really necessary? (Marked with red ovals in the attached picture snipped from the B4 manual)? Came to think about that after staring at the LXmini analogue filter at S.L.'s page.

/RK

 

[Soundhappy]

current-source-crossover-filters
phase-coherent-crossover-networks
Thanks Mr. Pass!
Kind regards 🙂

 

[adason]

Is the third JFET stage in the B4 really necessary? (Marked with red ovals in the attached picture snipped from the B4 manual)? Came to think about that after staring at the LXmini analogue filter at S.L.'s page.

/RK

probably not in bypass mode, but I would leave it there to separate two filters

 

[Davey]

Is the third JFET stage in the B4 really necessary? (Marked with red ovals in the attached picture snipped from the B4 manual)? Came to think about that after staring at the LXmini analogue filter at S.L.'s page.

/RK

In either position of the bypass switch it's just buffering a buffer. Not really necessary, but not doing any harm either.

Dave.

 

[Nelson Pass]

Is the third JFET stage in the B4 really necessary? (Marked with red ovals in the attached picture snipped from the B4 manual)? Came to think about that after staring at the LXmini analogue filter at S.L.'s page.

/RK

Actually, I think the diagram is in error.

 

[Michael Rothacher]

Wait. What?

 

[Nelson Pass]

You're right. My comment is in error, the diagram is fine.

😱

 

[Michael Rothacher]

Oh, thank heavens. I was beginning to suffer cognitive dissonance. 🙂