OB treble attenuation

[mkane77g]

I soldered up a .3mH inductor and stuck it on the + side of the FR driver. It seem to have lessened the shout but at the same time created some sort of boominess you might say. Can someone explain what I'm hearing.

 

[picowallspeaker]

You mean treble attenuation.
A tweeter is a type of loudspeaker.
You just operated a lowpass filter with that inductor;
usually you'll find a resistor parallel to the inductor, so you can "tune" a little.

 

[mkane77g]

DP____________________________________

 

[mkane77g]

Yes and thanks, tweeter attenuation. I just added a resistor and it helped tons.

 

[Tecumseh]

Why not just use a variable L-pad?
At least you could adjust the attenuation to suit you.

 

[mkane77g]

I bought some stereo l pads but I think I need mono, one for each speaker. I may be able to wire them as mono though ie; just use one side?

 

[Pano]

Title fixed

 

[mkane77g]

And after doing more research an L-pad just adjusts volume. Nothing like an low pass filter. I like what i hear but, I haven't got a clue how to choose the 'right' inductor/resistor to relieve this AN 10 of some shout.

 

[mkane77g]

Title fixed

And I thank you

 

[Tecumseh]

Which AN 10 inch are you referring to?
All seem to "shout" from 2.5K on up.
As per FR charts:

Classic Alnico.......3k-7k more or less
Classic Ferrite............2k-8K
Classic Super Ferrite............2.5k and up
Super 10 Alnico........12K-17K

Are you looking to use a Notch Filter?

 

[mkane77g]

Classic 10 Ferrite. So far tried 1.8 / 2.2 & 2.7mH inductors with 10 ohm resistor. don't know what a notch filter is. I'll look it up and thanks.

 

[mkane77g]

I have these pieces in the middle of the + side speaker terminals.

 

[mkane77g]

looks like these are notch filters.

 

[Tecumseh]

To start with a wide "Q": 2.5-9.5Khz (-5db)

Cap....10.92uf
Resistor....2.65 ohms
Inductor...0.27mh

Wire these in parallel (with each other) in the order listed
then wire this filter in SERIES with the AN on the (+) Terminal only.

You can change these values to change the attenuation needed but at least this should be a start.

 

[mkane77g]

Like this?

 

[mkane77g]

inductors I have on hand are 1.8, 2.2 & 2.7

 

[Tecumseh]

Like this?

That's right!

 

[Tecumseh]

inductors I have on hand are 1.8, 2.2 & 2.7

Your Inductor values are way high. Those are more appropriate at MUCH lower
frequencies (300 hz) etc..

I listed a filter for 5 db's of attenuation from 2.5-9.5 k.

3 db's would be:
C=8.58 uf
R=2.65 ohms
L= 0.21 mh

If you can get your hand's on a Audio Equalizer you could experiment.
Many AVR's have this feature as well as some older Receiver's.

 

[stocktrader200]

drive it with just the resistor. 2.7 to 5.6 ohm range
at less then a couple of watts you can test with 1/2 watt resistors

 

[mkane77g]

Thanks folks. I've ordered a few inductors, some cap's and resistor's. This is fun. The differences are easily apparent to the ear.