front speakers / high-pass crossover?

[Denis Perelyubskiy]

hello,

I just have a basic system with 4 mid-range, 2-way infinity speakers. I
am mostly happy with it (considering that I dont want to invest into the
aplifier at this point). However, one thing that keeps bothering me is
that my front door panels tremble a little too annoying. I solved this
problem on the back speakers by laying dynamat. I really don't want to
do similar in the front, since my door pannels are about to fall apart
:), so I don't want to take them off more then I need to. In addition, I
would not mind hearing a little less lows, from the front.

The question, then, is given my (cheap, existing) setup, can I just add
high-pass crossovers to the front speakers to filter out the lows there?

thanks,

denis

[Kevin McMurtrie]

In article >,
Denis Perelyubskiy > wrote:

> hello,
>
> I just have a basic system with 4 mid-range, 2-way infinity speakers. I
> am mostly happy with it (considering that I dont want to invest into the
> aplifier at this point). However, one thing that keeps bothering me is
> that my front door panels tremble a little too annoying. I solved this
> problem on the back speakers by laying dynamat. I really don't want to
> do similar in the front, since my door pannels are about to fall apart
> :), so I don't want to take them off more then I need to. In addition, I
> would not mind hearing a little less lows, from the front.
>
> The question, then, is given my (cheap, existing) setup, can I just add
> high-pass crossovers to the front speakers to filter out the lows there?
>
> thanks,
>
> denis
>

Use a high-pass crossover calculator to figure out what the capacitance
needs to be. It's probably in the 200 to 1000 ?F range. Double that
and put two polarized electrolytic caps back to back.

For example, if the filter says 250 ?F, then:

+ - - +
------|(----)|-----
500 500

The voltage rating of each capacitor should be 35V for a moderately
powered system or 50V for a high power system. Use axial lead if
possible because their internal resistance is usually a bit lower.

[Daniel Snooks]

Denis Perelyubskiy wrote
> hello,
>
> I just have a basic system with 4 mid-range, 2-way infinity speakers. I
> am mostly happy with it (considering that I dont want to invest into the
> aplifier at this point). However, one thing that keeps bothering me is
> that my front door panels tremble a little too annoying. I solved this
> problem on the back speakers by laying dynamat. I really don't want to
> do similar in the front, since my door pannels are about to fall apart
> :), so I don't want to take them off more then I need to. In addition, I
> would not mind hearing a little less lows, from the front.
>
> The question, then, is given my (cheap, existing) setup, can I just add
> high-pass crossovers to the front speakers to filter out the lows there?

Absolutely.

The cap value that you need is 330 microF for 100Hz crossover, go to a
220microF if you want to crossover higher then that. Wire the cap in series
with the speaker.

Kevin ... why wouldn't he just use a bipolar cap?

--
Regards,
Dan Snooks