Pass Labs B4 crossover questions

[Nelson Pass]

As soon as I get past BAF I will send them out into the world.

 

[Acousticer83]

Hi Nelson, any update? Regards

 

[Nelson Pass]

It's on the big list, which sez December 1.

 

[tbald53892]

Just a quick question Nelson - what oscilloscope display settings do you use to show the 1 watt (or 5 watts) power level? Many thanks!

 

[Nelson Pass]

You mean at the output of amplifiers?

The 1 watt window is 1 volt/vertical division, shows +/-4 V peaks which is 2 W
peak, which is what a 1 watt amp can do...

 

[cal3713]

Posting so I get thread updates. Thanks for all you do Nelson et al.

 

[noviygera]

You beat me to the question although you avoided asking it directly. Where's our crossover? Wait, I meant to say, when will you be sharing your crossover with us?

 

[AVWERK]

My Apogee Divas are starting to whine like a puppy wanting to go outside

When do you think we can open the door ?

 

[cubicincher]

I am also whining! It is a long road to the crossover....
Greets
Dirk

 

[Nelson Pass]

It is scheduled to be finished this weekend.

 

[RogerGustavsson]

Can this crossover be setup for non-standard slopes, not only Butterworth or Linkwitz-Riley but more like Bessel? I understand that it will take some fiddling setting the slopes anyway as it may have potentiometers and not fixed resistors.

 

[planet10]

I assume that is simply a matter of changing to appropriate filter Rs & Cs. As i understand it, 1st order to 4th order and the nature of the rolloffs controlled by the passive parts. This should be a very versatile device.

dave

 

[cal3713]

Excellent! Great news, thanks Nelson.

 

[Nelson Pass]

I assume that is simply a matter of changing to appropriate filter Rs & Cs. As i understand it, 1st order to 4th order and the nature of the rolloffs controlled by the passive parts. This should be a very versatile device.

I must send you one.

The crossover has a high-pass and low pass jumper selectable for 6, 12,
18 and 24 dB/octave. The frequency of each pole is independently
adjustable with on-board pots for 2 octaves - 1 octave on each side of a
center value set by the capacitor. In "ordinary" use, all caps are the
same values. The board accommodates pcb-mount connectors and level
pots, or wires can be run to external components.

 

[planet10]

I must send you one.

I would love that.

I have everything else ready. Speakers, bass amp, SIT-3.

dave

 

[codyt]

The crossover has a high-pass and low pass jumper selectable for 6, 12,
18 and 24 dB/octave. The frequency of each pole is independently
adjustable with on-board pots for 2 octaves - 1 octave on each side of a
center value set by the capacitor. In "ordinary" use, all caps are the
same values. The board accommodates pcb-mount connectors and level
pots, or wires can be run to external components.

This sounds great!

 

[cubicincher]

Thanks Mr. Pass! We all try to imagine how busy you are. And then always
the greedy boyz.....
Greets
Dirk

 

[RogerGustavsson]

I assume that is simply a matter of changing to appropriate filter Rs & Cs. As i understand it, 1st order to 4th order and the nature of the rolloffs controlled by the passive parts. This should be a very versatile device.

dave

Of course, but it will need some fiddling to create non-standard curves/slopes. Many speakers do not use standard slopes like my Magnepan.

 

[Nelson Pass]

Of course, but it will need some fiddling to create non-standard curves/slopes. Many speakers do not use standard slopes like my Magnepan.

Yes. That's why the R values on each pole are variable 4:1 range. I think
most of what you might want will be doable without changing the caps
if you pick the appropriate center value for the cap/frequency.

 

[cal3713]

Really looking forward to building one.