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akkilles 5th November 2013 10:12 AM

c-coil (toroid) in 2.5 way system

Just wondering if this is fine to use toroid c-coil from jantzen in 2.5 way system for lower bass output? In such system boths midwoofers are connected in parallel. One play mids(<2200hz) and lows and one only lows below 300-400hz. I thought to use c-coil for lower midwoofer. but can anybody tell me if c-coil(toroid) would have negative(audible) effect on "higher" midwoofer?

C-Coil -

DUG 5th November 2013 11:13 AM

mH of inductor?


Adding an inductor will not make more bass.

akkilles 5th November 2013 11:46 AM

4,7 mH
schematic (hi-pass for 27TDFC, lo-pass for U18RNX/P woofers):

akkilles 6th November 2013 07:14 AM

Since nobody knows :( I will try with c-coil and check if it is good idea

giralfino 6th November 2013 08:34 AM

Troels did use such a coil in a project. See here: DTQWT-mkII
But IMHO for a 4.7mH inductor I would stay with a more conventional and cheaper cored coil. One with DCR < 0.3 Ohm would cost less than half the one you are proposing.


sreten 6th November 2013 09:52 AM


L3 will not affect the bassmid driver. It does not
have to particularly low resistance in any sense.
L2 needs to be beefy to handle both drivers well.

rgds, sreten.

wolf_teeth 7th November 2013 07:54 AM

I had a pair of 4.7mH C-Coils that measured 2.7mH and 2.9mH, so please measure for best results. I also had a pair of 1.5mH that were just fine.


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