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RE: Best type of amp for low impedance/high sensitivity headphones?

Posted by Caucasian Blackplate (P) on March 4, 2014 at 08:48:27

In Reply to: RE: Best type of amp for low impedance/high sensitivity headphones? posted by nyrocker on March 4, 2014 at 08:36:22:

That is the general idea, but you would get ideal performance by knowing the impedance that you're starting with (of the existing level control), then selecting your pair of resistors appropriately.

In order for an in-line RCA attenuator to work reliably, the resistors used will generally be lower values so that the following control impedance is less of a variable. This can result in some degradation (IMO).

If I had to guess, this pad would present an 11K load to your source, as opposed to your level control, which would likely be 47K-250K. (The manufacturer doesn't explicitly state impedance, but they do mention compatibility)

If you're getting an amp custom-made, just asked for a stepped attenuator whose range is 20dB below normal. If you already have an amp, you could just build such an attenuator and replace the existing level controls.

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