Re: Simple Crossover Network - Advice Needed

[Kalman Rubinson]

Try one of the speaker building websites (or Dickason's Loudspeaker
Cookbook) for a simple 12bD/8vo 300Hz crossover circuit. You probably
need 2 caps, 2 coils and a pot.

Kal

On 15 Jul 2003 03:54:43 GMT, Jim Cate > wrote:

>I'm trying to purchase or build a simple, suitably fixed-frequency
>crossover network which I can use to protect a Maggie CC2 center speaker
>having a 300Hz - 15,000Hz range, approximately. I would like to divert
>frequencies below 300Hz to a small full-range speaker (an Advent
>10-inch) to protect the Maggie center from damage from lower
>frequencies. I intend to turn down the frequency of the Advent tweeter
>to an appropriate (natural sounding) level and adjust the relative
>volume of the Advent and the Maggie CC2 with a potentiometer.- I would
>guess that a rolloff of about 6 - 12 Db per octave would be appropriate.
>I'm now running the center and surround channels through an Outlaw ICBM,
>which hopefully would not be needed if the center speaker was connected
>as described above.
>
>It's likely that I'll have to build such a circuit. - Can someone give
>me a list of parts (capacitor, inductor, potentiometer, etc.) including
>appropriate power ratings, and instructions for wiring the circuit. Or,
>if this simply won't work, provide suggestions as to what would.
>
>Thanks,
>Jim

[Wylie Williams]

Whatever crossover you use will have a capacitor in the signal path to the
Maggies. It will be a large value and good caps at large values are
expensive. Cheap caps might harm the sound. To help resolve this dilemma
maybe somepne out there has experimented with high pass capacitiors in such
a situation and knows the minimum quality it takes to do a decent job.

"Jim Cate" > wrote in message
...
> I'm trying to purchase or build a simple, suitably fixed-frequency
> crossover network which I can use to protect a Maggie CC2 center speaker
> having a 300Hz - 15,000Hz range, approximately. I would like to divert
> frequencies below 300Hz to a small full-range speaker (an Advent
> 10-inch) to protect the Maggie center from damage from lower
> frequencies. I intend to turn down the frequency of the Advent tweeter
> to an appropriate (natural sounding) level and adjust the relative
> volume of the Advent and the Maggie CC2 with a potentiometer.- I would
> guess that a rolloff of about 6 - 12 Db per octave would be appropriate.
> I'm now running the center and surround channels through an Outlaw ICBM,
> which hopefully would not be needed if the center speaker was connected
> as described above.
>
> It's likely that I'll have to build such a circuit. - Can someone give
> me a list of parts (capacitor, inductor, potentiometer, etc.) including
> appropriate power ratings, and instructions for wiring the circuit. Or,
> if this simply won't work, provide suggestions as to what would.
>
> Thanks,
> Jim
>

[Nousaine]

"Wylie Williams" wrote:

>Whatever crossover you use will have a capacitor in the signal path to the
>Maggies. It will be a large value and good caps at large values are
>expensive. Cheap caps might harm the sound. To help resolve this dilemma
>maybe somepne out there has experimented with high pass capacitiors in such
>a situation and knows the minimum quality it takes to do a decent job.

The main issue with capacitors is the value. It is true that some of the less
expensive electrolyitc capacitors may be +/- 20% and that film capacitors will
often, but not always, have tighter tolerance but the sound quality of the
capacitor type has never been verified.

Indeed i conducted an experiment a few years ago where subjects compared a 8.0
mFd film "WonderCap" with a 8 mFd made from 3 paralleled Radio Shack 99 cent
electrolytics (to get the right value) when both were used as series coupling
capacitors in a direct-coupled amplifier. No subject was able to identify
either capacitor from a wire bypass or from each other in a double blind
comparison.

Stop worrying.

[Jim Cate]

Kalman Rubinson wrote:
> Try one of the speaker building websites (or Dickason's Loudspeaker
> Cookbook) for a simple 12bD/8vo 300Hz crossover circuit. You probably
> need 2 caps, 2 coils and a pot.
>
> Kal
>
> ------------------------------------------------------------------

Do you have some recommended websites?

Jim

[Kalman Rubinson]

On Wed, 16 Jul 2003 00:54:22 GMT, Jim Cate > wrote:

>Kalman Rubinson wrote:
>> Try one of the speaker building websites (or Dickason's Loudspeaker
>> Cookbook) for a simple 12bD/8vo 300Hz crossover circuit. You probably
>> need 2 caps, 2 coils and a pot.
>>
>> Kal
>>
>> ------------------------------------------------------------------
>
>Do you have some recommended websites?

Not offhand but, if I needed to (I have several books on this), I'd
find them (again) with a Google search. Try DIY. Loudspeakers,
Madisound, etc. Mebbe others will chime in.

Kal