CAPI Sumbus 32x4 2025
Our users rate Reverb
Bought this brand new from Resistance Audio about a year ago. Selling as I'm moving house so need to free up some funds for new studio room. Hasn't had much use and is in perfect condition. Racked up in smoke free studio.
32 Channels. 4 Outputs.
Will also include 4 DB25 planet waves cables if desired.
Power supply.
Collection or delivery.
Feel free to message or make an offer.
Pasted info from their website about the build, transformer details etc:
The audio path of the SumBus is quite unique. Each input channel contains a CA2622 input transformer and CAPI's own DTO5 discrete opamp. Each ACA is a 2520 style opamp and a quadfilar 2503 wired 1:3. The sound of this box is like no other. This is largely due to the multiple transformers in each channel of the audio path. It's not just about the actual summing process itself but more about the additional circuitry that comes before and after those little bus resistors. Most summing mixers have transformers on the stereo output ONLY, so you're paying a small fortune for a bunch of $0.02 resistors and a pair of transformers. The SumBus is a completely different animal!
The SumBus is a semi-modular design meaning the channel count can be expanded as work flow requires or funds permit. The input channels are on individual cards which plug into a PCB backplane. The top cover of the chassis needs to be removed for the input channel cards to be properly inserted, hence "semi-modular". The ACA cards are also inserted into PCB backplane card edge connectors. These can be removed and reinserted without removing the top of the carcass.
The gain staging of the SumBus is overall based on a vintage API console and the 2-ACA-Bo card. The 2-ACA-Bo is a 2-stage mix bus. This means the ACA (active combing amplifier) stage is followed by an active booster stage. 6dB of gain is provided by the booster stage. The SumBus only contains the first half of the 2-ACA-Bo's signal path so technically the SumBus should be followed by a pair of line amps to makeup this 6dB. The SumBus inputs are at +4dBu nominal and the outputs are -2dBu nominal.
This item is sold As-Described
This item is sold As-Described and cannot be returned unless it arrives in a condition different from how it was described or photographed. Items must be returned in original, as-shipped condition with all original packaging.Learn More.
| Listed | 2 months ago |
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| Condition | Excellent (Used) Excellent items are almost entirely free from blemishes and other visual defects and have been played or used with the utmost care.Learn more |
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