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-   -   Do I need a cap here? (http://www.diyaudio.com/forums/planars-exotics/87949-do-i-need-cap-here.html)

Will 9th October 2006 06:15 AM

Do I need a cap here?
 
I'm going the direction of fully active tri-amp setup with dipole woofers, dipole mids and Fauntek neo2.0 cd using a driverackPA as the processor.

My question is, if I want to power the ribbon tweeter section with a tube amp like a darling 0.75W of power (btw the neo is rated 97dB/w) do I need a coupling capacitor for DC protection here ? By right I do not need them as the tube amp already has the OPT to filter DC. Am I taking a huge risk by omitting the cap ?

will.

badman 9th October 2006 02:03 PM

Hums, etc, might be a risk. I would probably not use one, but I'm a maniac :)

Will 10th October 2006 01:21 AM

Anyone else with similar experience ?

stokessd 10th October 2006 01:27 AM

If you are already transformer coupled, you shouldn't have any DC to block. The only time you'd have DC issues is if you had a transformer failure, and then you've got big problems anyway. A series cap could protect you from low frequency content while you are getting your crossovers sorted out, and may be a good safety measure though.

I'd put a cap in during testing for protection until you've got your crossover roughed in, and pull the caps out or short across them for final voicing.

Sheldon

Will 11th October 2006 12:27 AM

Quote:

Originally posted by stokessd
If you are already transformer coupled, you shouldn't have any DC to block. The only time you'd have DC issues is if you had a transformer failure, and then you've got big problems anyway. A series cap could protect you from low frequency content while you are getting your crossovers sorted out, and may be a good safety measure though.

I'd put a cap in during testing for protection until you've got your crossover roughed in, and pull the caps out or short across them for final voicing.

Sheldon


That's a good thought thanks ! Perhaps I can put a cap with a delayed bypass switch using a timer, so that during power up the cap will be there, only to be bypassed after a minute or so.


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