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In Reply to: RE: Best type of amp for low impedance/high sensitivity headphones? posted by Caucasian Blackplate on March 04, 2014 at 08:24:31
Thanks for the link. I've tried Rothwell 20db RCA attenuators, using them at the input. Is what you're suggesting a lot different from these?
http://www.rothwellaudioproducts.co.uk/html/attenuators.html
I would say that they helped a fair amount with the volume knob but also affected the sound. In an A/B comparison I preferred not using them. I'll read through your suggestion. But is there a different amp alternative that would avoid this modification?
Follow Ups:
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.
Thanks again CB! (I'd love to know the story on your handle :)
I will discuss this with Goldpoint and see what works best.
Best of luck on your search! Sometimes it's tough to avoid the audio hypochondria.
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