Speaker Tone Control

[jcspirited 77]

I am trying to wire a tone control in a speaker cabinet of mine. It is an 8 ohm speaker that has a little to much high end. The amp that I am using has no tone control, or it wouldn't be a problem. Something in the line of a potentiometer and a capacitor. I tried wiring one in connected to the positive side of the speaker to the potentiometer. The capacitor to the other lug to ground, didn't work. Any info would be helpful

 

[makkem]

Hi
You will not be able to put a tone control in the speaker line due to the high signal levels and low impedances involved.
The place for the tone control would be between the source and the amplifier.

 

[jcspirited 77]

I was afraid of that, thanks

 

[americanaudiophile]

You cannot put a "tone control" into the speaker but you can use a capacitor in series to roll off the high end. Here is a link that might prove useful:
http/www.bcae1.com/capspkr.htm
You would try different caps to create different roll off points. You can start with 8 khz and try different caps.

 

[jcspirited 77]

You cannot put a "tone control" into the speaker but you can use a capacitor in series to roll off the high end. Here is a link that might prove useful:
http/www.bcae1.com/capspkr.htm
You would try different caps to create different roll off points. You can start with 8 khz and try different caps.

 

[jcspirited 77]

Thanks for the info. My next move was to see about some typ of roll off.
I checked out the link, that was helpfull. I by no means am a sound tech. Useing the calculator on one of the web pages. I need a typ of coil (to crossover the high frequencies I don't want) in series with the speaker. With that said, would you mind double checking my findings once I have a chance to figure them out.
So for:
Using an amp with 250 watts per channel. One 12" 8 ohm speaker per channle figures out around 45 volts per channel. So I will need at lest a 45 volt ( I will use 50 volt) cap. or inductor.
My speakers are rated at 55-5000 Hz. frequency response. The highs have a buzz like sound. So I want to roll off ( crossover ) some of the highs. I am thinking I don't want anything higher then 2000 or 3000 Hz. My even be more like 900 or 1000, don't know. The calculator on this web page
http/www.bcae1.com/passxovr.htm
gives me this:
900 Hz. 22.11 cap - 1.41 inductor coil
1000 Hz. 19.89 cap - 1.27 inductor
2000 Hz. 9.95 cap - 0.64 inductor
3000 Hz. 6.63 cap - 0.42 inductor
The cap ( capacitor ) rolls off the lows. The inductor coil rolls off the highs.

 

[americanaudiophile]

Any components you use for your filter should be 50% to 100% higher than the voltage you expect them to see. In most cases it does not affect the price very much.