hi - (very 'basic' q's - very grateful if anyone can bare to answer, thanks.)
I'm looking into experimenting taking bottom end off my mains (8'' 3 way; ellam flex 3) so just my sub is left to the 'subsonics'. I've heard a good way of doing this is simply via a input cap to amp - NC400s (inZ 104K).
Q; I'm running fully balanced so presume a cap is required on the + and - ?? (as i've suggested in diag)
an online calc has given me the values on pic - just checking i haven't made some schoolboy error? looking to roll off from 40hz down initially - its easy to cheaply add another cap to increase this value and push the point lower. (thinking of la clanche sig path caps)
p.s. apologies if i'm using wrong terminology 'c.30 Hz' as in 'circa'
many thanks if you can assure me I am on the right track or otherwise
R
I'm looking into experimenting taking bottom end off my mains (8'' 3 way; ellam flex 3) so just my sub is left to the 'subsonics'. I've heard a good way of doing this is simply via a input cap to amp - NC400s (inZ 104K).
Q; I'm running fully balanced so presume a cap is required on the + and - ?? (as i've suggested in diag)
an online calc has given me the values on pic - just checking i haven't made some schoolboy error? looking to roll off from 40hz down initially - its easy to cheaply add another cap to increase this value and push the point lower. (thinking of la clanche sig path caps)
p.s. apologies if i'm using wrong terminology 'c.30 Hz' as in 'circa'
many thanks if you can assure me I am on the right track or otherwise
R
Attachments
You need to drive the amp input with low impedance or you'll raise the noise floor a lot. The input impedance of 104k is not meant to be used as part of a filter pad, and may be fairly mythical anyway
You need a self-contained RC filter at a low enough impedance to keep noise under control. For instance two 2.2µF caps on the inputs with 3k6 load across the outputs of the caps gives a balanced RC high-pass with cutoff around 40Hz
What is the source? Does it have a nice low output impedance that can handle a balanced 3k6 load?
You need a self-contained RC filter at a low enough impedance to keep noise under control. For instance two 2.2µF caps on the inputs with 3k6 load across the outputs of the caps gives a balanced RC high-pass with cutoff around 40Hz
What is the source? Does it have a nice low output impedance that can handle a balanced 3k6 load?