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Multi-Way Conventional loudspeakers with crossovers

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Old 23rd January 2003, 01:06 AM   #31
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Radio music would be perfectly fine. My friend used pink noise on his and it did the job. The purpose is just to get them loosened up and to where they will be for the rest of their life span.

Well, if you want to be picky This is my first from scratch speaker design with a crossover and I really dont know that much about it project.

I have experience in making the box and so forth, but this is a whole nother level(i think so anyway).
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Old 23rd January 2003, 02:06 AM   #32
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yeah, I am just being picky.. lol
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Old 27th January 2003, 10:31 PM   #33
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I have the drivers in my hands now. I want to get started on the cabinets, and I have ordered cross over parts. I had madisounds leap design serivce done for me.

Win ISD says .1 cube sealed. Has anyone done this woofer sealed before?

Also, in the crossover design, there is what I beleive is a notch filter in the tweeter circuit, and it has a 140mfd cap in it. I bought solen caps for the rest of the crossover, but I bought Bennic non-polar electrolyics for the 140mfd, becasue of cost. Should I have done this? I can always switch it out later, but I really dont like paying $70 for two caps.

Thank you
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Old 27th January 2003, 10:45 PM   #34
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Quote:
Originally posted by onebadziggy
I have the drivers in my hands now. I want to get started on the cabinets, and I have ordered cross over parts. I had madisounds leap design serivce done for me.Win ISD says .1 cube sealed. Has anyone done this woofer sealed before?
Also, in the crossover design, there is what I beleive is a notch filter in the tweeter circuit, and it has a 140mfd cap in it. I bought solen caps for the rest of the crossover, but I bought Bennic non-polar electrolyics for the 140mfd, becasue of cost. Should I have done this? I can always switch it out later, but I really dont like paying $70 for two caps.
Thank you
I do not think the Caps are so critical.
Non polar Caps are usually quite good quality.
Many of them made mainly for LSP Crossover use.
-------------
What project did you finally settle for?
And what are your drivers/woofers?

Halo
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Old 27th January 2003, 10:56 PM   #35
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140mfd!!! That's really big, you may have an error in the crossover.
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Old 27th January 2003, 11:55 PM   #36
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I bought Vifa P13's and D27's. Didnt really follow any project, I am just gonna do this on my own I guess. Im going with sealed boxes, and WinISD says .1 cubes, is that a good size?

I also think 140mfd is outragously large, but its on a tweeter zobel network, and I think its centered around 500Hz so Im not too worried about it. I have 6dB/octave main crossovers for them.
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Old 28th January 2003, 12:12 AM   #37
halojoy is offline halojoy  Sweden
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Default WinISD says .1 cube

Well I count in liters.

But that .1 cube ft, is at QTC 0.71.
What Qtc one likes, it is a matter of taste.
It gives different slope on the bass rolloff.

The enclosure acts, in fact, like a filter component.
And depending on the size of the box, Vb(Volume box)
you get a different kind of low frequency rolloff.

Values of Qtc above 0.71 upto 1.0 gives a steaper curve.
At 0.71, you get the lowest -3dB frequency.
Values below 0.71 gives a more shallow curve.

If you test with Qtc=0.50 & then 1.00,
you will see the difference between the slope of the curve.
And you can see that for 0.50 box is larger
and for 1.00 box is smaller.

I prefer rather low Qtc. Like 0.55-0.65.
This gives teoretically a better transient responce.
But at the same time the Bass get somewhat dampend.

/halo
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Old 28th January 2003, 12:23 AM   #38
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I'm sorry you had to go through that long post as I already am knowlegdable about Qtc. Sorry for not mentioning that, I just wanted some suggestions on people's experiences.

Anyhoo, I think I will go with a lower alignment becasue of its many benefits. That and I can make the enclosure a sensible size.

How much effect does the baffle size have on the resposne and crossover? I have one designed for a 7" wide by 15" tall baffle and that is rather large for a tweeter and a 5". If I made it 7" wide and perhaps 10" tall would that affect me much or not?

Thank you for the refresher on Qtc by the way halo.
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Old 28th January 2003, 01:23 AM   #39
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Default Re: WinISD says .1 cube

Quote:
Originally posted by halojoy
I prefer rather low Qtc. Like 0.55-0.65.
I too like it better down here... even down to 0.5 snd use room lift to get max bass.

Also bigger box means lower pressure which should open the mids up a bit.

This driver works well in a TL to.

dave
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