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WAW / FAST build ?
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Old 27th February 2015, 12:26 AM   #1
ton def is offline ton def  United States
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Default WAW / FAST build ?

I have a pair of Alpair 7 and sdx7 that I bought several years back. I would really like to start a build with these. I would likely need to use a passive x-over,as I have no dsp or experience with them. Any plans or examples of this ? I have seen planet 10's ,but I do not quite understand PLLXO. Thank you

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Old 27th February 2015, 01:00 AM   #2
Cal Weldon is offline Cal Weldon  Canada
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WAW / FAST build ?
PLLXO is less expensive. Hopefully Dave can chime in soon.
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Old 27th February 2015, 01:38 AM   #3
planet10 is offline planet10  Canada
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WAW / FAST build ?
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Originally Posted by Cal Weldon View Post
PLLXO is less expensive
And really easy to build. Do you have 1pr SDX7 or 2?

dave
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Old 27th February 2015, 03:36 AM   #4
Bob Brines is offline Bob Brines  United States
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Consider DSP and bi-amping. The price of admittance has gone down seriously in the last couple of years.

Bob
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Old 27th February 2015, 04:05 AM   #5
ton def is offline ton def  United States
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Quote:
Originally Posted by planet10 View Post
And really easy to build. Do you have 1pr SDX7 or 2?

dave
I have one pair of sdx7. Is your design adaptable to use only one sdx7 per speaker ?
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Old 27th February 2015, 04:09 AM   #6
ton def is offline ton def  United States
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Quote:
Originally Posted by Bob Brines View Post
Consider DSP and bi-amping. The price of admittance has gone down seriously in the last couple of years.

Bob
Yes, that would probably be the best way to go.... But I am not knowledgeable with that technology ( and cash limited ) .
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Old 27th February 2015, 04:35 AM   #7
planet10 is offline planet10  Canada
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WAW / FAST build ?
Quote:
Originally Posted by ton def View Post
I have one pair of sdx7. Is your design adaptable to use only one sdx7 per speaker ?
Sure. It makes a passive XO possible, but the A7 may need padding down.

dave
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Old 27th February 2015, 04:57 AM   #8
ton def is offline ton def  United States
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Originally Posted by planet10 View Post
Sure. It makes a passive XO possible, but the A7 may need padding down.

dave
By padding down the a7, do you mean attenuation for spl equalization or limiting current to it ?
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Old 27th February 2015, 05:39 AM   #9
planet10 is offline planet10  Canada
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WAW / FAST build ?
Reducing its SPL.

A point to keep in mind is that by the time you sort passive parts their cost will very likel be in excess of what a 2nd amp (something like a TDA2116 or 18 would be fine) & PLLXO will cost.

dave
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Old 27th February 2015, 10:23 PM   #10
chrisb is offline chrisb
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I don't think the question as to how PLLXO is implemented has actually been described, this primer is as good a place to start as any, and includes an excel calculator to determine component values.



TLS.org | Passive Line-Level Crossover


In short, it can be as simple as a pair of resistors and very low value caps at the input of each amp - they can even be soldered directly at the input jacks with a bypass switch for full range.

Dave: note that the link to Alex's website on the bottom of BSC page is now 403
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