zoranaudio said:You will loose a lot of power, and that thing will be massive like one bass driver, try other way , active.
I'm asking which alternatives I have to NOT go active.
other way
You might look into a higher Hz cross over point and then control the output from the woofer with the Enclosure. I mean maybe 180hz with the passive components to save power and complexity in the crossover but make a box that can absorb the next 100hz your looking for. You can find info on this concept at the auto-sound web sites.
Borus
"YA but what does he know anyway"
You might look into a higher Hz cross over point and then control the output from the woofer with the Enclosure. I mean maybe 180hz with the passive components to save power and complexity in the crossover but make a box that can absorb the next 100hz your looking for. You can find info on this concept at the auto-sound web sites.
Borus
"YA but what does he know anyway"
An option to go active: http://www.htguide.com/forum/showthread.php4?t=28300&highlight=active+crossover
Peter
Peter
Re: other way
I forgot to say that the speakers will be entirely Open Baffle, so I cannot and dont want to play with cabinet resonance. I will be using 2x 15" Hawrhorne Augies (or 4x 10") for 30-80/90/100 range.
I'm definitely NOT going above 100hz.
So, how big would such crossover be?
The budget would be <500€ for each.
I found this site:
http://www.apicsllc.com/apics/Misc/filter2.html
BTW, if someone can point me to some writeup of different types of crossover filters, I would be glad.
tinitus said:Bandpass cabinet...acoustic lowpass filter
Borus said:You might look into a higher Hz cross over point and then control the output from the woofer with the Enclosure. I mean maybe 180hz with the passive components to save power and complexity in the crossover but make a box that can absorb the next 100hz your looking for. You can find info on this concept at the auto-sound web sites.
I forgot to say that the speakers will be entirely Open Baffle, so I cannot and dont want to play with cabinet resonance. I will be using 2x 15" Hawrhorne Augies (or 4x 10") for 30-80/90/100 range.
I'm definitely NOT going above 100hz.
So, how big would such crossover be?
The budget would be <500€ for each.
I found this site:
http://www.apicsllc.com/apics/Misc/filter2.html
BTW, if someone can point me to some writeup of different types of crossover filters, I would be glad.
Re: Re: other way
Well, to get a reasonable DCR out of an air core coil, I calculate that a 6" I.D., 13" O.D. core, 3" long wound with 350 turns of 6AWG magnet wire (assuming you can find such) would give you a ~24mH coil with a DCR of .34ohms. This would weigh 73.5 pounds and cost $440 at ~$6/lb. This would work for a 6 ohm driver in a L-R 80Hz lowpass. Interesting things happen with the resonance peak, you may want to model it....
You could use a laminate core and save 90%, but once you compromise your principles, you might as well go active
Telstar said:So, how big would such crossover be?
The budget would be <500€ for each.
Well, to get a reasonable DCR out of an air core coil, I calculate that a 6" I.D., 13" O.D. core, 3" long wound with 350 turns of 6AWG magnet wire (assuming you can find such) would give you a ~24mH coil with a DCR of .34ohms. This would weigh 73.5 pounds and cost $440 at ~$6/lb. This would work for a 6 ohm driver in a L-R 80Hz lowpass. Interesting things happen with the resonance peak, you may want to model it....
You could use a laminate core and save 90%, but once you compromise your principles, you might as well go active
Re: Re: Re: other way
What about using the t-bass?
http://www.diyaudio.com/forums/showthread.php?s=&postid=1660762#post1660762
BTW the woofers are 8ohm.
I checked that article but it doesnt explain the differences i.e. between 1st and 3rd order crossover.
Ron E said:
Well, to get a reasonable DCR out of an air core coil, I calculate that a 6" I.D., 13" O.D. core, 3" long wound with 350 turns of 6AWG magnet wire (assuming you can find such) would give you a ~24mH coil with a DCR of .34ohms. This would weigh 73.5 pounds and cost $440 at ~$6/lb. This would work for a 6 ohm driver in a L-R 80Hz lowpass. Interesting things happen with the resonance peak, you may want to model it....
You could use a laminate core and save 90%, but once you compromise your principles, you might as well go active
What about using the t-bass?
http://www.diyaudio.com/forums/showthread.php?s=&postid=1660762#post1660762
BTW the woofers are 8ohm.
I checked that article but it doesnt explain the differences i.e. between 1st and 3rd order crossover.
Cal Weldon said:For the price of the passive components, you could buy a plate amp.
If I wouldn't have also to buy a preamp, it could be a viable solution.
Robh3606 said:Why not line level passive??
Rob
Excuse me?
Cal Weldon said:1st order = 6dB per octave and involves 1 choke coil
3rd order = 18 dB per octave and involves two chokes and a capacitor
Trying to do this at passive level is too expensive and too lossy IMHO.
I was actually thinking of a 4th order low-pass, that wouldnt have phase problems. More or less expensive?
Robh3606 said:Why not line level passive??
Rob
Nevermind. Easier using a plate amp and very nearly the same thing.
Rob
I really didnt understand the suggestion.
Did you mean a passive preamp?
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