Full Range EQ

[Leicaphile27]

Sorry, I meant C5. What does C5 do?

 

[JeyDee]

As i understand it, it is there to block DC on the output. Same thing here. Good cap is always good, go way mega fancy? Up to you…

But i am not a luxury cap expert at all, but i plan to do some A/B- listening tests one of these days🙂

 

[Leicaphile27]

Thanks JeyDee. Really helpful information. I'm going to try some Clarity Caps I have left over from another project. The fun continues!

 

[WBS]

That's the epitome of Nelson's philosophy of using what you have on your shelf!

 

[JeyDee]

So. Well? We sometimes really, really need to EQ the retarded old paper thin mix.

But…

Then? What is a really fantastic soundmix?

Here With a added value, truely fantastic, video mix. In my book: Truely Fullrange, dynamic, juicey, live, powerfully bass rich, and musically engageing.

Here is one in my book: No EQ needed:

Enjoy!!! 🎷🙂🎸

Crankit!

 

[captain pugwash]

So come on then how would you disable the high filter section? I'm sure it's obvious to most but not to me!

 

[pinholer]

Remove C3, C4, R5, P1, and short out R4 will do it.

 

[captain pugwash]

That's great, thanks a lot. Ideally I would like to be able to switch the treble filter on and off but a bass only circuit will be great to start with. My first target is my Mark Audio Alpair 10P drivers which to my ears need nothing taken off the top end but a bit more bass is always welcome.

 

[twocents]

I'm still waiting for my EQ kit to arrive, but would like to play around with MicroCAP. Anyone willing to share the schematic (CIR) file for this circuit? It would be very helpful and save a lot of time, for me anyway.

 

[Nelson Pass]

Here is what I have.

 

[twocents]

Fantastic. Thank you Mr Pass!

 

[captain pugwash]

Is 4.7k instead of 4.75k ok for R11?

 

[Zen Mod]

yup

 

[Skylar88]

Where should the two 100R resistors included in the kit be used? In the schematic, both R7 and R9 are specified as 100R (thus 4 resistors). Strangely, the BOM has them as 100K.

Edit:
Just searched for a BOM in this thread and couldn't find one. So maybe I drew up the BOM from the schematic myself and made the 100K mistake.

But I'd still like to know why there are only two 100R resistors and where they go.

 

[Nelson Pass]

The 100 ohm resistors are Source to ground on the CCS Jfets. They are matched to the Vp for about 10 mA bias.

 

[Skylar88]

Thank you Nelson. I have missed that if it was mentioned somewhere.

That means they are for R7 (not for R9 which is the same resistance).

 

[Nelson Pass]

I routinely use 100 ohms for output resistance....

 

[claudio52]

Pay attention to the pin diameter of the power input jack (post #62, CP-037B-ND). The center pin is 2.5 mm.

 

[Skylar88]

Where does this EQ work best? Before or after a preamp? Or doesn't it matter?

I'll be trying to "civilize" 12 inch Audio Nirvana Classic FR drivers that I'm extremely happy with actually, but they're not perfect.

 

[Nelson Pass]

If you have more than one source, probably after....