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Old 8th July 2013, 09:38 PM   #11
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The FR curve for that Peerless 850488 mid-woofer suggests it might not even need ANY crossover! Then tailor a tweeter XO to taste with a cap and a resistor, and use the exisiting active XO for the woofer...
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Old 10th July 2013, 05:15 PM   #12
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The FR curve for that Peerless 850488 mid-woofer suggests it might not even need ANY crossover! Then tailor a tweeter XO to taste with a cap and a resistor, and use the exisiting active XO for the woofer...

Like I mentioned, my knowledge on XO design is very limited, very limited.

I was looking more for a kit or manufactured XO versus actually designing one.
Thanks anyway though.

Al
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Old 10th July 2013, 08:14 PM   #13
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If you call Madisound, they will design a custom crossover and even build it for you.

But if you wanted to get a tiny taste of DIY (and take advantage of the perfectly matched ~90dB/W sensitivities of mid-woofer and tweeter and the mid-woofer's nice top end roll-off), we could put a capacitor in front of that tweeter and make a simple first order (6dB/oct) xo.
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So with your 8 Ohm tweeter and aiming for about a 5-6kHz high pass, I would start with a 2uF film cap and experiment with values around 1.6-2.2uF....
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Old 11th July 2013, 02:23 AM   #14
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Originally Posted by Andersonix View Post
If you call Madisound, they will design a custom crossover and even build it for you.

But if you wanted to get a tiny taste of DIY (and take advantage of the perfectly matched ~90dB/W sensitivities of mid-woofer and tweeter and the mid-woofer's nice top end roll-off), we could put a capacitor in front of that tweeter and make a simple first order (6dB/oct) xo.
Network Circuits

So with your 8 Ohm tweeter and aiming for about a 5-6kHz high pass, I would start with a 2uF film cap and experiment with values around 1.6-2.2uF....
Ok, that I might be able to do, cap in front of tweeter in series then?


I just look for a 2uF flim cap then??

Nothing it sounds like for the mid woofer and low woofer then?
er...I see you mentioned the original XO for the woofer.

Thanks much.

Al

Last edited by AllenW; 11th July 2013 at 02:28 AM.
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Old 11th July 2013, 10:04 AM   #15
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Look for the maximum AC voltage allowed in the datasheet.
It is usually quite different from the maximum (rated) DC voltage specified on the component.
2uF is a non preferred value (E24). Use more readily available E6 or E12 values.
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Old 11th July 2013, 05:44 PM   #16
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If you choose carefully from the current selection of cheap film caps from Apex Jr, with f.ex. 0.22uF, 1.5uF, and 2.0uF, you can make 1.5uF, 1.72uF, 2.0uF, and 2.22uF. Give those combos a listen, and adjust to taste.

If you're in the US, I will even send you some Mylar 0.22uF, 0.42, 1.0, and 2.2 for nothing...
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Old 12th July 2013, 12:06 AM   #17
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Look for the maximum AC voltage allowed in the datasheet.
It is usually quite different from the maximum (rated) DC voltage specified on the component.
AndrewT's paranoia knows no bounds, bless his tiny heart! He'll be relieved to know the tweeter is wound with fuse wire that will protect the cap...
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Old 13th July 2013, 04:03 PM   #18
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If you choose carefully from the current selection of cheap film caps from Apex Jr, with f.ex. 0.22uF, 1.5uF, and 2.0uF, you can make 1.5uF, 1.72uF, 2.0uF, and 2.22uF. Give those combos a listen, and adjust to taste.

If you're in the US, I will even send you some Mylar 0.22uF, 0.42, 1.0, and 2.2 for nothing...
Thanks, I live in Minnesota.

Free is always nice, but I don't mind paying for them.

I'll PM you my address, once again, thanks.

Al
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Old 25th July 2013, 04:51 AM   #19
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I'm disappointed in the error checking on this thread: Good thing I confirmed with a book and recalculated, as the cap value should be about 4.1uF for a ~5500Hz 6dB/oct xo for an 8 Ohm tweeter. Caps on their way!
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Old 25th July 2013, 02:10 PM   #20
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I'm disappointed in the error checking on this thread: Good thing I confirmed with a book and recalculated, as the cap value should be about 4.1uF for a ~5500Hz 6dB/oct xo for an 8 Ohm tweeter. Caps on their way!
Thanks much, looking forward to getting the system up and running again.

Al
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