Pass Labs B4 crossover questions

Jump to Latest
#82
I'm using a DBX 223XS. I use it for bass only. Since my SFL-2 preamp has 2 sets of balanced outputs I run my main loudspeakers full range, with out the DBX, and run the 2nd set of outputs into the DBX for bass frequency's and attenuation only.

If I purchased a B4 crossover I'd be switching back to unbalanced connections and running everything thru the B4. My top cabs use passive X-overs.

Not sure if it would be worth doing, but there are a lot more choices of preamps if I went back to using unbalanced connections.

Plus who knows, my main MTM loudspeakers just might benefit from running thru the B4. I have know idea at this point.
 
#85
Last edited:
#88
Hi Zen Mod, Thanks for your answer, but I understood that option from reading post #84. However, I would prefer something neat directly from Pass, even if it costs double the price of a B4.
 
Last edited:
#90
The buffer Juma uses in his LSK preamp is a good alternative to the Toshiba PP option. It uses readily available and inexpensive parts and performs quite well. If going balanced, consider LTP input that can accept balanced input, but having SE ouput. Simplifies the Xover part and the signal can be converted back to balanced any number of ways, with a transformer being one. I know transformers are terible things, but consider the fact that the exist in so many of the mixing tables that are a part of the recording process and they become less offensive.
 
#93
Nelson Pass said:
Two B4's.

😎
Click to expand...

Mr. Pass,

Wouldn't it be a potential issue in such a setup that the transistors in the two B4 (one for + and one for -) are not matched pairs, so it is not ideal in terms of balanced operation? Matched level adjustment pots, etc? Or perhaps I am wrong.

Would it be difficult to have two monoblocks (one per channel), with matched transistors, proper XLR connector etc so that a Two-chasis B4 would be a neat balanced unit? I only ask because perhaps such a unit (with a top power supply) could sound better than the PASS XVR-1 that I own, or not?
 
Last edited:
#94
It is more important that the transistor pairs running push-pull are matched,
giving the offset and distortion cancellation. Matching between channels is
less important.

If you want matched channel pairs from one of mine, you will find them within
a single B4 or units with close serial #'s, as I do production from matched
batches.

😎
 
#98
The first version of the B4 had a high pass attenuator, with -5, -10, -15, and -20dB switches.

The second version of the B4 has an attenuator selector, where you can select whether the front control knobs attenuate low pass or hi pass.
 
#100
Original '14 version of B4 for sale?

Does anyone have one of the original 2014 version of the First Watt B4 x/o they care to sell? I'm thinking the 600 ohm output of my EAR 868 pre-amp will like the 100k input impedance of the original better than the 10k of the revised version. Or am I mistaken? Forgive me, I'm not electronically educated like ya'll ;-).
 
You must log in or register to reply here.
Top Bottom