CAPI SumBus ACA Summing Mixer

Not sure the 1 has a proto yet...

I haven't seen one. I know he made the boards

Awesomeness.

I do have a full demo version of the rotary controlled channels. We are waiting on the custom version of the knobs (metric shaft holes) and front panels to come in. The front panels were not ordered when the other panels were ordered. The single channels were built when the dual channel cards were built.

All the transistors are FET switching for the bus on/off routing. I would have preferred running the audio thru the switches but there was physically no way so FET’s handle it well.

Yes, each input channel has a CA2622 and a DTO5. Single stage virtual earth summing with a 2520 style opamp and 2503 style output transformer strapped 1:3.

Was hoping you guys could let me know cost?

Retired Gearpimp says:
Better to lock it down firm than quote early !!!

So nobody hold Jeff to this ! I remember a manufacturer that no longer exists having to raise the price on a compressor 25% above the first estimate because the manufacturer that originally quoted the screws couldn’t deliver unless they wanted to wait a year!

So I can purchase in pieces? I'm looking at 24 Max, but could build in 8 channel increments?

Thanks Eric. The price above is very close to accurate. Its all of the options that I need to firm up as far as smaller configurations etc. I had to get a very close estimate to the street price before even deciding if I would go to market. It is a little more dough than some others but none really have the level of signal path that the SumBus has.

As soon as we get the first round sorted/kitted up and all of the store listings done they’ll be ready. ASAP but no hard date. It’s impossible to say exactly. I was shooting for March but we missed.

The system is “semi modular” meaning it can be built in 8 channel increments. The carcass top needs to be removed to add/remove channel blocks so it’s not fully modular like a 500 rack.

jsteiger The only rack is the full 19” rack right? Will there be Black empty space panels available?

Cant say anything if they sound different sonically. 

And the SB2 is 32 channels(up to that count) so twice the channels of the SB1

I know from the other thread a few of us where talking about it. For the SB2 if you wanted to run a mono channel, say lead vocal, guitar solo, kick and snare, or bass or something like that. You would have to run it out of 2 channels from your D/A and you press both the  buss buttons to make it mono in the SB2. So you need 2 D/A channels to run a mono into the summing mixer. 

That might not be a big deal for some. 

The other thing is the SB1 has level control for both busses. So you could use one of the busses as an FX send sort of. Even two if you pan one thing hard Left or Right to split the signal. On top of that you could attenuate the signal coming into the SB1 to really drive the input transformer if you so desired. 


In my perfect world I think it would be awesome to have 8 channels of the SB1 and 16 of the SB2. Us the SB2 channels for stereo busses and you could breakout center channels to the SB1, or still use them as stereo channels but make them narrower or pan them where ever you want or over drive them. 


I think I asked Jeff about that though and he said that he hadn't planned on setting it up where you could mix and match the channels like that. 



So for me, the SB1 has some cool features you can use where as the SB2 is kind of a set and forget setup. 

So if you route one channel to your SB2 and hit both L/R on the pannel it goes out mono? 


Actually..now that you say that and I think about it...that makes perfect sense. As they are still mono input channels. My bad. 

Well, the level and panning still has some fun things you could do with the SB1 over the SB2