Hoffman Amplifiers Tube Amplifier Forum
Other Stuff => Effects => Topic started by: separateness on August 15, 2023, 11:25:51 pm
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Gentlemen
I have at my home one Behringer Ultra-DI 600P. While not perhaps a most enviable piece of gear I do find use for it. Namely I place it between my bass amplifier and its speaker cabinet, and this allows me a direct signal which I can run to my recording console. I have found it to work quite well and have had no issues with it. Well, I thought I hadn't until I was looking at a manual for the thing online and learned that frequency response was from 40hz at which point it was already down -3dB. As some one who tunes by bass BEAD, I was appalled. Having pored over numerous options of building something new or buying something better, I am now considering merely modifying what I already have. Attached is a schematic I drew up of the thing, or at least as best a schematic as I could cobble together without the thing in front of me (for, scoundrel that I am, I am writing this while at work). You will note that it has a ground lift for the XLR, a sort of high pass filter and a pad. It seems like the HPF should not work when the pad is not used but I could be misinterpreting the schematic.
Anyway, my plan of attack is to lower each of the resistor values by a decade which I think will improve the low frequency response of the transformer.* Am I misinterpreting facts, science and reality in supposing this should work? I know I will thereby reduce the power handling capability of the device but it is suppose to work with amps up to 3kW. My bass amp is 100W.
*This is based on information gleaned from an ancient groupdiy post by the illustrious PRR.