[audiokiep]

I have noticed that I get channel imbalance with prosumer devices such as Benchmark DAC1, Slimdevices Transporter or Behringer DEQ2496. They all have fairly high XLR outputs.
BP26 literature is very unclear on XLR input capability, it only indicates sensitivity of 1V for xlr inputs.

I have looked at the BP26 schematic and found jumpers labeled as "+4dBm pads" on xlr inputs. Can they be used to bring down the +4dbu volume of pro gear? There is no mention of it in the manual (btw, the schematic has a "BP-25" heading and "BP-26" in the drawing title).

Can anyone (hopefully James Tanner) clarify if this is an undocumented feature that can be used for situations like mine? Given Bryston's pro ties I am hoping that this is the case.
Thanks,

[James Tanner]

I have noticed that I get channel imbalance with prosumer devices such as Benchmark DAC1, Slimdevices Transporter or Behringer DEQ2496. They all have fairly high XLR outputs.
BP26 literature is very unclear on XLR input capability, it only indicates sensitivity of 1V for xlr inputs.

I have looked at the BP26 schematic and found jumpers labeled as "+4dBm pads" on xlr inputs. Can they be used to bring down the +4dbu volume of pro gear? There is no mention of it in the manual (btw, the schematic has a "BP-25" heading and "BP-26" in the drawing title).

Can anyone (hopefully James Tanner) clarify if this is an undocumented feature that can be used for situations like mine? Given Bryston's pro ties I am hoping that this is the case.
Thanks,

I will check with engineering on Monday for you.

james

[audiokiep]

That would great. I did open it but the MC board which I also have covers the whole input area and I couldn't tell if there are any jumpers in there. I don't want to touch the board as it is clipped very tightly.

[James Tanner]

That would great. I did open it but the MC board which I also have covers the whole input area and I couldn't tell if there are any jumpers in there. I don't want to touch the board as it is clipped very tightly.

Hi,

The BP26 has footprints for an input pad on each bal input.
The BP26 Pro versions come with this pad installed.
Each bal input is attenuated 14db, and the input impedance changes to approx 5k per leg.
The pad can be designed for any value.
There are traces to cut so the mod should be done at the factory.

Stuart

[audiokiep]

I didn't know there was a Pro version of BP26.

So would the mod set the input to the new padded value only or would it also include a jumper allowing to go back to consumer input level?
I presume adding jumpers might affect purity of the signal.

Perhaps I should get one input modified. What would be the est. cost?

[James Tanner]

I didn't know there was a Pro version of BP26.

So would the mod set the input to the new padded value only or would it also include a jumper allowing to go back to consumer input level?
I presume adding jumpers might affect purity of the signal.Perhaps I should get one input modified. What would be the est. cost?

HI,

The mod is permanent. As long as the source equipment is happy with a lower input impedance there is no degradation to the signal. Parts added are 16 resistors.

There are traces on the bottom of the board that need to be cut, and given that it's a phono it's a bit more work to install the resistors.  This can easily be returned to stock by removing the resistors and replacing two per input with 0R resistors.
 
Cost about $200 plus shipping
 
Mike