Full Range EQ

[Robert k]

Any pics in particular?

 

[JeyDee]

I am contemplating potentiometers in the R3 and R5 positions for maximum tuneability. 🙂

The n00b question of the day is: I assume that a linear potentiometer in these positions would give the ”right feeling” of EQ response, as apposed to a logarithmic potentiometer.

Am i right or wrong about that assumption?

 

[Zen Mod]

Any pics in particular?

if you mount it in case properly grounded (screws) it'll not buzz

 

[Robert k]

Thank you, I have a little case on the way, as always, much appreciated.

 

[Buckapound]

I have a couple of questions about the 100k potentiometer in this circuit. First, I'm assuming a dual/stereo audio/log taper, correct?

Second, When the pot knob is turned, what actually happens? I'm planning on using a 10-position, 4-pole switch to change R3 and R5 values to choose the curves per NP. So, I'll have two knobs, one of which will select a curve. The pot's the other. How would I use and label them?

 

[JeyDee]

Two ”stereo” linear potentiometers, 200k, more range than i probably need, for bass and treble testing arrived today.

Gonna listen, measure, and feel, if that gives exactly the right knob feel🎷🙂🎸

Live and learn 😎

 

[JeyDee]

Hrrm… Sorry🙂🤚
Forgot to add this.

So simply just crank it up. A lot. No EQ needed.

Highly Probably the absolutely coolest guitar tune in the known universe. 😎🎸

 

[Chasmo57]

I also have EQ files for some specific full range drivers...

I'm hoping to get assistance here for my full range drivers, which are Tang Band W3-665SC(there are very large number of these out there, as Logitech used them for years in their THX multimedia systems).
I have both the Manufacturer data sheet, and a text file of measurements in my listening room.

 

[Chasmo57]

Text file listing W3-665SC driver measurements taken at 1M in my 15'x24'x8' listening room, using the imm-6 with Audio tool on an iPhone.

Thanks in advance for any assistance.

 

[Chasmo57]

SORRY.
Try again:

Thanks

 

[bloozestringer]

Ready for Lii F-15 (+super-tw) in OB.
R3 is a pot+res.

View attachment 1191164

Any success with the F15's and supertweet? I've got a pair of F15's in some Caintuck style/sized temp baffles that might welcome this EQ.

 

[woody]

Buckapound, in this case I don't think an audio taper pot would work well we need an linear
taper pot.

I don't have any J113's on hand I assume I can just use some of these obsolete
2sk170's ?

 

[Buckapound]

Thanks Woody, I had come to that conclusion based on a closer reading of the circuit and description

 

[Vix]

Very grateful for your help, I’m getting 11 volts at the first capacitor and zero at the second.

Hello,

I was once again looking up at this circuit closely, and I noticed something wrong in the schematics?
The voltage dividing resistors, shouldn't they both be 4.75 k, so we get half the supply voltage at this point (where the + of the 1000 uF cap is attached)
There should be only one 47.5 ohm resistor, not two (the one that comes from + supply).
Also, in the article I read that "A bass equalization circuit is formed by C1-C2 and R1-R3".
Shouldn't it read R2-R3? R1 is just to bias the jfets, isnt'it?
I still think the circuit is wonderfully simple for what is does, but some folks may be confused, so I just wated to make sure that it is right.

Kind regards,
Vix

 

[ZUM911]

Isn't the 4.75k for current limiting the LED and the 47.5 resistors and 2 1000uF caps the rcrc filter?

 

[shaan]

Awesome read!

I did something similar in 2021 for my Alpair 12Ps in onken-ish cabs and it did make them much flat. It was a passive one, placed between the pre's output and amp's input, so it lacked the gain at LF but with the curve looking somewhat similar to yours. It was a very revealing experience.

 

[woody]

Those pair of 47 ohm resistors and the 4.75K resistor are not acting as a voltage devider.
The first 47 ohm resistor and 1000 uf cap is just a power suply filter and if we had 24V in
we might get ~ 23.99V out to the next 47 ohm resistor and 1000 uf cap but now might have
~ 23.98 V And that 4.75k resistor and led just tell us uou have the circuite powered on.

 

[LBHajdu]

This is just a curiosity question but what stops the turn-on thump in this circuit? Is it the PS rise time? The original B1 had huge RC values for the virtual ground and discharge diodes whereas this filter only has two 332K deviders.

 

[manniraj]

Got hold of Fane 12-250TC full rangers as wanted to try a simple open baffle and here they are in progress. Got some inspiration from another post to have the wings as support for the baffle. Pair of some project wood 16”/3ft with wings being 5”/3ft 😊

Now I wanted to use this equaliser kit that’s lying with me and anyone has some suggestions on what values needs to be changed for this driver?
So far initial impressions paired with LU amp and FE2022 is pretty good but wanted to try this equaliser to tame the highs and improve the lows as what’s intended by Papa in his article

Thanks

Thiel small parameters of this driver

 

[Skip Pack]

I suggest you try it with the specified values and scope out the hf dip adjustability first. I think you'll make better choices than simply using driver specs and verbal suggestions. Too many variables unaccounted for.

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