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/showdetl.cfm?Partnumber=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/searchResults.cfm?srchExt=CAT&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]

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/showdetl.cfm?Partnumber=266-464

 

[planet10]

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/filters/passiveHLxo.html

dave

 

[serenechaos]

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.

 

[Thawach]

if u design 4th bandpass sub. acoustic filter helps a lot that u can use only one coil (order 1) with bandpass sub. if your driver is 4 ohm. the coil isn't big too much.

 

[doug20]

This stuff doesn't work ?


http://www.parts-express.com/pe/showdetl.cfm?Partnumber=266-464

Why are you bothering with any of this stuff. You should really consider using something like the CX2310, doing crossovers between subs and mains is what its perfect for.

 

[planet10]

Side thread about Foster Plate Amp split to here

http://www.diyaudio.com/forums/showthread.php?s=&threadid=146228

 

[oaristys]

After scrap a 75$ titanium tweeter because my finger slide by accident.

After scrap my Fostex suspension with my fu.... crewdriver.

I think i have to take a break an review if i want to continue this hobby.

When this happen i feel so frustrated and the feeling inside me is bad for my health.

Hesterday, i'm so proud of me with my mini speaker. A gift for my son and today, after varnish, when installing the driver for final finish. My square screwdriver popup the screw and scratch the fostex 107E suspension (a bit smallter than a peas hole).

I hate installing drivers. It's always embarrassing. I feel so numb. This hobby is supposed to give the invert feeling.

And this driver is B/O here ! lol If i can find a peace of strong, light and flexible tissue with some transluscient flexible glue....

Haa what do you do when this happen ? Do you have a punching bag and a tender shoulder to crying on ?

 

[oaristys]

Sorry all.

I understand your advice. I will think about that. Thank you for your help !

I will abort this project. Better to suit with another different one.

The only thing is that many of existing product seems to be impossible here.

Many side mounting woofer exist and doesn't require biamping with active crossover. And some model aren't pricey.

It's the same with the high efficiency and parts price and box volume. I can buy 900$ small Paradigm monitor serie speaker with over 92 db, good bass.

Everyone said "hoffman" law buy ProAc sold TriTower, very small and 35hz-40khz response at 90db ! My gigantic tour are unable to do that. ... Reach about 92db but no bass.

Overall, every DIY project i have heard sound more plain, coherent and spacious than many market product but with less bass. I think market boost the bass for selling. It is not possible to combine the two world and get small enclosure, efficiency and sound quality ? it's seems to be only 2 of 3 available in any world ...

Anyway.. I love you all. You are generous and good people.

Maybe i don't have enough money to do this hobby and many frustrations are emerging from that.

 

[oaristys]

Just think about Rega affordable speakers ! The R3, R5 and R7 have side mounted woofer and no crossover at all.

That's it what i see with i close my eye and dream to perfect diy project.

Plug two totally different amplifiers with filter after and before etc... it simply turn me off.

Lol i want to do Rega clone ! haha, someone already do that ?

 

[doug20]

Overall, every DIY project i have heard sound more plain, coherent and spacious than many market product but with less bass. I think market boost the bass for selling. It is not possible to combine the two world and get small enclosure, efficiency and sound quality ? it's seems to be only 2 of 3 available in any world ...

You can always port like all the comercial companies do with their small speakers but once you hear great bass with a sealed design, ported designs seem like a gimmick (I know they are not though)!!

btw, you can have great base in a 2 cuft box with PRs but IMO main speaker design is all about 60Hz and above....everything below should be handled by a good subwoofer (or 4!)

 

[oaristys]

You can always port like all the comercial companies do with their small speakers but once you hear great bass with a sealed design, ported designs seem like a gimmick (I know they are not though)!!

btw, you can have great base in a 2 cuft box with PRs but IMO main speaker design is all about 60Hz and above....everything below should be handled by a good subwoofer (or 4!)

i have to admit one thing

Once you have a good active subwoofer, it's far away easy to build satisfying speaker.

 

[oaristys]

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/filters/passiveHLxo.html

dave

Good link ! Hey seems to have lot of good drivers for cheap !

I will order some drivers and amp to do cheap but good sounding project.

We have surplus stuff locally here but nos specs but your store have all the specs !

Thanks !