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Old 02-28-2017, 11:23 AM   #6
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Join Date: Aug 2014
Posts: 6,756

Originally Posted by karbomusic View Post
He'll get some insertion loss FWIW. If the interface has a proper instrument in with high enough impedance, there is really nothing he'll gain. A well-designed instrument input is essentially the same as the input of a properly designed stomp box input (that's good). To your point, that doesn't mean that any losses don't sound good, I surely have a box I built where I can adjust impedance because sometimes I don't want an exactly pure copy of the original guitar signal.
Hey, you know far more about the guts of stuff than me, just wondering what your thoughts on the below are:

"Do passive DI's present a different load to a guitar or bass as opposed to active DI's?

Passive direct boxes have had a bad rap for years, mostly due to misunderstandings and holdovers from the early days or touring. In the beginning, the 'transformer of the day' came from broadcast. The 600 ohm standard line level transformer changed the tone and feel of passive instruments like the Fender P-Bass due to loading. What happens is the magnetic pickup in the bass is driving the signal to the bass amp and hundreds of feet of cable to feed the PA system, splitting the signal evenly between the two. When you do this with the wrong transformer, the bass player immediately notices a lack of fidelity and punch. Today, we specify our Eclipse transformers in our direct boxes at 130,000 ohms, a far cry from the 600 ohms that were once used. Therefore the loading is no longer as problematic as it used to be. In fact with the advent of high output active basses, passive direct boxes are often preferred as they are able to handle the output without clipping."

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