ruffrecords said:erikb1971 said:first sketch of stereo 2U posh men's eq... love the way you can switch the mid sections off or off and how there is a double boost mid, but no cut..... sloppy work, better later!
I am not sure about the double boost you have there. The idea was you could have a single frequency control that could be switched to either boost or cut OR you could have two frequency controls, one assigned to cut and the other to boost. Although you could have two mid boosts you would have to be very careful how you used it. If you set the boosts to the same frequency you would not get double the dB boost. The boosts are quite wide so you might well get two separate boosts where the frequencies are an octave apart for example but much closer and they will start to interact. I am not saying don't do but just be careful if you do. An interesting alternative might be to look at a pair of mid boost/cuts with no-overlapping frequencies using two different inductors. That way the lower end could be extended to the region of 150Hz and include frequencies like 150Hz and 180Hz which are useful for removing hum. So one control could cover from 150Hz to 1.5Khz and the second from 1.6KHz to 16KHz for example.
Cheers
Ian
ej_whyte said:I was planning on having 2 mid bands, both boost/cut switchable, haven't decided whether they will have identical overlapping freqs. or split bands yet. Is this still feasible as long as I dont put both bands in boost at close frequencies as described?
Cheers
baadc0de said:Is this design feasible then?
Large picture:
http://dl.dropbox.com/u/12679166/PoshMan4U.png
FPD file:
http://dl.dropbox.com/u/12679166/PoshMan4U.fpd
mikeyB said:Hi Ian - just been reading your notes regarding an eq with 2 non-overlapping bands. Do the 2 bands connect to the same places in the network (effectively in parallel) each with a 1k and 4k7 back into the network?
Thanks in advance
mikeyB said:Hi Ian - you mentioned somewhere in the notes about scaling the capacitors down by a factor of 4 if you scale the pots up by a factor of 4.
Is this the case for the mid boost band as well regarding the inductor. I notice the carnhill has a max of 1H whereas a standard pultec inductor has a max typically 267mH (roughly a quarter).
Can you use this general rule of thumb?
I have quite a few pots in magnitudes of 22 (ie 2k2/22k/220k) and was thinking of trying these out. I would then be talking of a network with input imp of 2k5? Cap values would be halved from an original network of 600R.
Thanks as usual for such a great project.
gemini86 said:I have a few questions. To preface; I'm planning to build a 4 band unit, non overlapping centers.
1) am I correct to assume the each mid band is connected the same?
2) according to my simulations, the bandwidth of the boost frequency is much wider than cut. This can be changed by lowering the 4k7 resistor. Does doing this cause any problems with impedances or anything?
3) There's nothing stopping me from using individual inductors vs a multi tap inductor, correct?
Thanks!
gemini86 said:Thanks Ian. Last question, is the cut supposed to be limited to about 6dB?
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