 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
172.11.32.65
In Reply to: RE: Output Coupling Caps updated for Marantz 7 posted by Tube747 on January 30, 2025 at 05:19:59
You are referring to the 0.22uf output caps?
Running this into an amp with 50k input impedance will give your -3db point at 14hz. At 100k ohms you are down to 7hz. These are below the hearing threshold, but they can impact the bass phase response that you can hear.
Adding 2uf to 5uf here is fine and will eliminate the phase interactions. What you actually hear will be fairly subtle. A high quality 0.22 cap will sound better than an average 2uf cap. Of course, if this is a real historic Marantz 7 you will impact the value of it.
Follow Ups:
If you are 3db down at 14Hz then you are 1db down at 28Hz with phase shift all the way to 140Hz.
If you want (and some people don't) 20Hz totally un-disturbed by the high pass filter, then the 3db down point of that filter needs to be 2Hz.
Same is true at the other end. If you want 20kHz un-disturbed by a low pass filter, then the -3db point needs to be 200kHz.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I found this web and the author actually put 4.7uf for output coupling, and increased the other coupling value to 1.2uf
I decided to use 0.22uf. Thanks all!
| FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
||||||||||||||
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
