150hz crossover

[oaristys]

Hello,

I need to crossover a subwoofer and a fullrange somwhere about 150 or 200hz

Solen design 2 parts 100$ crossover. Too expensive.

I want something cheap like that

http://www.parts-express.com/pe/show...number=266-464

It's for a FAST configuration so the lower is better but the fullrange speaker i can buy decrease from 220hz to 120hz.

I think in this mind, i can only let the fullrange free and cut the woofer somwhere between 150 - 200hz.


What should i buy ?

[rabbitz]

For subwoofers give a passive crossover a miss and buy a sub amp. You can then blend the sub to your fullrange driver using the sub amp controls.

http://www.parts-express.com/wizards...AT&srchCat=505

You can usually pick them up on ebay at cheap prices.

[oaristys]

thank your for advice.

But this is for a passive speaker. I already have solution but search for cheaper one. Buy an amp is expensive and i need to high pass anyway

[planet10]

Originally posted by oaristys
thank your for advice.

But this is for a passive speaker. I already have solution but search for cheaper one. Buy an amp is expensive and i need to high pass anyway

Move your crossover higher then. Anything below 200 Hz is best done actively. And given the cost of decent parts, a passive XO will probably be more expensive than a pr of plate amps.

dave

[oaristys]

pair plate = 300$

Passive XO = 95$ with Solen capacitor and good gauge inductor

[oaristys]

This stuff doesn't work ?


http://www.parts-express.com/pe/show...number=266-464

[planet10]

Originally posted by oaristys
This stuff doesn't work ?

It is 300 Hz not 150, and someone would have to be very lucky for it to work -- a decent XO is very much a function of the drivers & boxes, and getting an off-the-shelf XO to work decently probably has about the same chance as being struck by lightning.

And it is iron core inductors & bipolar electrolytics. Not decent parts.

XOing at 150 Hz is much harder as you are working in the area where the drivers have their resonant peaks, with impedance ranging from (say) 4 ohms to 50 ohms within the range of your passive Xover. You'd need a minimum of 2 (big) parts to flatten the woofer impedance & 3 to do the midrange. And then your XO (and 1st order probably wouldn't do, so add at least 4 parts/side). Then add in the extras you end up with because the 1st cut needs modifing. Caps alone in the size you'd need for 150 Hz (using an on-line tect-book calculator and 4 ohm parts)are $30-50 each & the chokes (10g) $140ish. 14 guage are just over $50. 4 cheap chokes + 4 caps (ignoring impedance compensation) is ~$400.

http://home.comcast.net/~jhidley/

Not quite half-way down are surplus NHT/Foster WF-100K plate amps for $35 each. Even with postage costs (don't do UPS unless you can have it shipped to a US address you can pick them up from), they will be much less than the passive XO that won't likely work. I just bought 10 of them. The high pass can be done with a PLLXO in conjunction with the box roll-off. http://www.t-linespeakers.org/tech/f...ssiveHLxo.html

dave

[serenechaos]

Originally posted by planet10

And it is iron core inductors & bipolar electrolytics. Not decent parts.

If you really want to stay away from adding more cheap amps;

Motor run caps are decent for larger caps.
(& can bypass w/ something exotic if you want to get fancy;
I recently heard a pair of feastex crossed @ 200 this way, worked beautifully...)

You can always "wind your own" inductors, w/ some heavy gauge magnet wire...

[PeteMcK]

what is the impedance of your drivers at your chosen crossover frequency?

[901Fixer]

I done ordered me two of them Foster WF-100K plate amps, thanks for the tip Dave. $103.42 shipped to me.

I understand your frustration Oristys but passively crossing over in the low frequency range is not the beauty way to go. It will work but the sound quality will surely suffer and this is about High Fidelity after all.
Crossing over passively on the input side of the amplifier, PLLXO, works much better as the impedence is consistant and therefore the crossover point will be what you design it to be without too many parts in the mix.
It has been my experience that when the knowledge here differs with what I think or know that I'm usually incorrect in my understanding of the topic. It is best to listen to what they have to say and ask questions so as to clarify things you don't understand, especially if you post the question to begin with. Sometimes it takes me a few days to mull it over in my head and accept a new idea or way to accomplish what I'm trying to do.