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Headphone Calibration Controls (Read 1852 times)
JohnnyB
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Headphone Calibration Controls
07/29/15 at 15:58:41
 
Hi All,

I just procured one of Steve's CSP3's and am going to use it as a preamp for a newly built Dynaco-70.  The question I have is in regards to the Left and Right headphone calibration controls, what setting should those be on when using as a preamp?  The documentation says to turn the main volume to about 1/2 and then adjust the Left and Right Output controls but nothing about how to set the headphone controls along with the Output controls.  Any help would be great!!!! Cheesy
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Archie
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Re: Headphone Calibration Controls
Reply #1 - 07/29/15 at 16:55:28
 
JohnnyB -- I use a CSP3 in front of a ZMA.  If you refer to the product page and the lettered picture I use the following settings.  Part of this comes from Steve and part from my experience with the amps.

Master Volume (H):  Just slightly back from full

Headphone Cal Controls (B):  Full on

Output Controls (C): 2 o'clock to 3 o'clock.  Also used to balance speakers if imbalanced.  These can be set between clicks.

I use the volume control on my ZMA between about 9 o'clock and 12 o'clock.  I find if I use the ZMA at full and the CSP3 Master Volume to control the listening level I get more HUM from my speakers.

I added knobs to the posts on the CSP3 to help with making adjustments easily.
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Tripwr1964
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Re: Headphone Calibration Controls
Reply #2 - 08/02/15 at 17:52:14
 
In my system I like the output at 1-2 o'clock and headphone cal at 2-3 o'clock.  For speaker listening.
Play around with it for a month or so.... You'll figure out what u like.
Love those little knobs Smiley
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JohnnyB
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Posts: 16
Re: Headphone Calibration Controls
Reply #3 - 08/03/15 at 15:59:41
 
Thanks for the suggestions, i really do appreciate it.  I now have a starting point to begin my quest for the perfect settings  :D

Archie,
What type of knobs did you add to the posts?  It would be easier if they were a little bigger.
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Archie
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Re: Headphone Calibration Controls
Reply #4 - 08/03/15 at 16:41:18
 
JohnnyB, I bought my knobs from Digikey.  The link shows their smaller knobs which I used on my CSP3 input and output posts.  I bought a taller knob for the Master Volume.  Search their sight and you'll see lots of options.  Stick with the 1/2 inch diameter knobs though so you'll have enough space between the knobs and the tubes.

I also put these knobs on my ZMA bias posts and master volume.  I like the clean black look, the index line and the ability to grab with my fat fingers!

http://www.digikey.com/product-search/en?pv91=329&pv183=6711&pv73=37&pv76=469&pv...
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JohnnyB
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Re: Headphone Calibration Controls
Reply #5 - 08/03/15 at 18:24:33
 
Thanks Archie!!!  These will help immensely, especially if putting the CSP3 in a cabinet.   Smiley
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JohnnyB
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Re: Headphone Calibration Controls
Reply #6 - 08/05/15 at 17:23:38
 
Archie,

Did the 1/2" diameter knobs fit around the Master Volume knob or did you need to change that one to 1/2" as well to make everything fit?  Thanks!! Smiley
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Archie
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Re: Headphone Calibration Controls
Reply #7 - 08/06/15 at 16:52:49
 
I took off the stock knob and replaced it with a 1/2 inch diameter knob.  You need to get knobs that fit over a 1/4 inch post.  I'm not sure why Steve doesn't put index lines on his wood knobs.  Originally I put a line on the wood knob but I like the look of the 1/2 inch black knobs better.  My master volume knob is taller than the input/output knobs too.
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Archie
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Re: Headphone Calibration Controls
Reply #8 - 08/06/15 at 21:02:13
 
I looked at my CSP3 and the stock wood knob would work with 1/2 inch knobs on the other controls but it would be a little tight.
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JohnnyB
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Re: Headphone Calibration Controls
Reply #9 - 08/12/15 at 16:56:50
 
Archie,

I placed an order from Digi-Key yesterday for (5) .50" knobs to replace the master and get something i can grab on the other 4 controls.  Thanks for the suggestion!!! Smiley
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