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Pass Labs B4 crossover questions
Pass Labs B4 crossover questions
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Old 8th April 2020, 03:56 PM   #631
Gyuri is offline Gyuri  Hungary
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And how's about B5?
Would be my my greediest welcome.
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Old 8th April 2020, 04:09 PM   #632
Nelson Pass is offline Nelson Pass  United States
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Pass Labs B4 crossover questions
Quote:
Originally Posted by Zen Mod View Post
wait for Pa's schematic , then introduce bipolar supply, taking all Vref points to GND

remove interstage coupling caps

easypeasy
There are only input and output coupling caps, no "interstage"
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Old 8th April 2020, 04:52 PM   #633
planet10 is offline planet10  Canada
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Pass Labs B4 crossover questions
Quote:
Originally Posted by Gyuri View Post
And how's about B5?
Isn’t that essentially what we already have in the diyAudio Store.

Analog Crossover Network – diyAudio Store

Aimed at the LX-mini but very versatile.

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Old 8th April 2020, 05:14 PM   #634
Zen Mod is offline Zen Mod  Serbia
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Pass Labs B4 crossover questions
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Originally Posted by Nelson Pass View Post
There are only input and output coupling caps, no "interstage"
me dunno

that's what Son of Gustav presumed ....

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Old 8th April 2020, 05:20 PM   #635
WBS is offline WBS  United States
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Pass Labs B4 crossover questions
Glad you know!
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Old 9th April 2020, 01:48 AM   #636
ZUM911 is offline ZUM911  Australia
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Quote:
Originally Posted by planet10 View Post
Isn’t that essentially what we already have in the diyAudio Store.
Doesn't look as versatile to play with various drivers as the B5 would be. I could be wrong but it looks like component values need to be changed to alter the crossover. With the the B5 you flick switches.

I'd be keen to see a DIY B5.
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Old 9th April 2020, 02:03 AM   #637
planet10 is offline planet10  Canada
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Pass Labs B4 crossover questions
I believe that this simplification is also in the one we are talking about here as well. If you want to flic switches i think you will need to get a real Firstwatt one.

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Old 14th April 2020, 03:21 PM   #638
Giallograle is offline Giallograle  United Kingdom
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Just logging on in the hope of a heads up when these arrive.
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Old 23rd May 2020, 06:02 PM   #639
R-K Rønningstad is offline R-K Rønningstad  Norway
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Pass Labs B4 crossover questions
I tried to reverse engineer the B4. My guess is attached. The Rs have values ", 2R, 4R, 8R, ...
For the LP part of the B4 crossover, opening all DIP-switches will open R9 - R12 (see attachment). This means no signal will reach the inputs of U5 and U6. (Likewise, opening R1 - R4 will the audio straight to the positive inputs of U1 and U2. I guess maybe the gates are grounded via 1Meg?)

/RK
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File Type: jpg B4.jpg (150.8 KB, 103 views)
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Old 23rd May 2020, 06:09 PM   #640
Nelson Pass is offline Nelson Pass  United States
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Pass Labs B4 crossover questions
The Gates are provided with 2 Meg to ground to insure that there is no
excitement when switching or if the resistors are left open.
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