Xo

[rinx]

If I am using two Dayton RS225S then midrange ( not yet sure, which) and 810921 in 3-way system. So the question is what should be XO point for 810921? 1500 or higher towards 2000Hz. I search from forum and found that people are crossing 810921 even close 1500, in 2-way. But in my case i am gonna use more input (two RS225S), so if I am crossing tweeter 1500Hz( it has excellent low end distortion) is it posseble to damage tweeter to use high input power?

[Inductor]

Hi rinx,
I see that you are doing some progress. Can you direct me/us to your drivers (webpages). Regards.

[planet10]

Idealy any XO is outside of the critical telephone band -- 300-3kHz, I like to have them even further out, Choose a midrange accordingly.

dave

[Inductor]

What planet10 is saying (and correct if I am wrong) is that you first choose the main driver and the rest will fit in beautifully. First choose the car then the tires, if you know what I mean. What you call the mid is your main driver. Do as planet10 is saying and choose a good driver the very first with acceptable parameters. We can direct you if you want so.

[planet10]

Originally posted by Inductor
What planet10 is saying

yep

[Jay_WJ]

Originally posted by rinx
If I am using two Dayton RS225S then midrange ( not yet sure, which) and 810921 in 3-way system. So the question is what should be XO point for 810921? 1500 or higher towards 2000Hz. I search from forum and found that people are crossing 810921 even close 1500, in 2-way. But in my case i am gonna use more input (two RS225S), so if I am crossing tweeter 1500Hz( it has excellent low end distortion) is it posseble to damage tweeter to use high input power?

I agree with what people said in the above. As for the 810921 HDS tweeter, even if you use two RS225s, a 1.5 kHz LR4 crossover with the 810921 won't cause any problem. I bet the woofers will give up (i.e., reach its excursion limit) before the tweeter does. If you doubt, try a simulation. Usually, it's the woofer(s) that determine a speaker's power handling, not the tweeter. That's why people want to use multiple (even 3 or more) woofers.

[Jay_WJ]

BTW, using the HDS 810921 in a 3-way design is pointless. If I were to build a cost-effective 3-way now, my driver choice would be quite clear. No better cost-effective choices than the RS225s for the woofer and the RS52 for the midrange, IMO. Take a look at Zaph's small driver test page. From 500 Hz to 3 kHz, there are no other drivers that outperform the RS52 in distortion performance. Since you can use the RS52 up to 3 kHz, there are some nice, inexpensive tweeters you can choose from. Aura Sound NT1-204-8D will be a good choice. If you're willing to spend more money, Peerless XT19 or Seas 22TAFG will be another.

[rinx]

First-why is 810921 pointless in 3-way. ( Because I am not using the strenght of 810921, wichs is a really good low end distortion?!) Of course I was thinking also half price XT25 or DX25. Right now I am looking good midrange (have read this before, that it should cover up to 3khz, but still there is a lot speakers wichs has XO 2 to 2,5Khz?!).

I have searched info and projects from internet as much as posseble. And read times Zaph's page, so thats where I got idea to buy 810921. It should be close to SS6600, wich is expensive. So, the question is still, is it 810921 in 3-way system pointless to use? If yes, then why.

And the drivers data:
http://www.partsexpress.com/pe/showd...number=295-366

http://www.madisound.com/catalog/pro...a6d6add2b89a43

[planet10]

Originally posted by Jay_WJ
there are no other drivers that outperform the RS52 in distortion performance.

That it forces you to cross over right in the critical band eliminates it from any consideration to my mind. (on top of that i'm not enamoured of most domes)

dave

[planet10]

Originally posted by rinx
[B]First-why is 810921 pointless in 3-way. ( Because I am not using the strenght of 810921, wichs is a really good low end distortion?!)

Looks pretty good to me,,, with an Fs of 700 you can cross some 3 octaves up, and with good low frequency distortion, use a low order XO (remember XOs are evil, typically the less of them and the further they are from the critical band the better IMHO)

dave