I'm trying to crossover my Dayton RS225-8 at 1200hz. I realize I'm pushing them a little high to avoid breakup but they are what I have to use without purchasing new drivers. No measuring capability here and don't understand simulation software. I'm using MH-Audio calculators. The calculator asks for driver impedance at XO point. Factory specs show about 9 ohms impedance at 1200hz. Do I use this impedance AND add a Zobel to flatten impedance or just use this? Thanks for any suggestions. By the way they are in a 42 liter BR cabinet with a 10" wide baffle. Also wondering if baffle step is needed. Thanks again.
If you use a Zobel, the impedance for the calculation is the total impedance of the driver with the Zobel.
You use a Zobel or an RC network (it does not need to flatten driver impedance totally, depends...) exclusively when you can't get the LP response behave exemplary without one.
It won't be 9 ohms after you add the standard Zobel. Just for interest's sake it should be possible to make a special 9 ohm compensation instead but why complicate needlessly.
Skipping it and using 9 ohms may be fine, yes the impedance will be changing but that's not the only thing that will be, ie the response will be too. Either way you might eventually come to a similar result.
Skipping it and using 9 ohms may be fine, yes the impedance will be changing but that's not the only thing that will be, ie the response will be too. Either way you might eventually come to a similar result.
When you say "no measuring capability" - do you have an iPhone? There's programs that will display a real time frequency response of an acoustic signal. Put that with a pink noise file playing continuously and you can certainly see the response of your attempted cross at 1200 Hz, using "nth" octave bands, where n is the frequency resolution.
The mic in the iPhone will certainly pickup flat enough about 1kHz...
The mic in the iPhone will certainly pickup flat enough about 1kHz...
What are you crossing to, please: a tweeter or full range?
There are existing successful projects which use both; Dayton RS28A tweeter, Vifa TC7 or TC9, Visaton full range, I'm sure there are many others.
The full range were crossed lower than 1200Hz but I think (think) the RS28A was crossed at 1400, if that would work for you?
Geoff
There are existing successful projects which use both; Dayton RS28A tweeter, Vifa TC7 or TC9, Visaton full range, I'm sure there are many others.
The full range were crossed lower than 1200Hz but I think (think) the RS28A was crossed at 1400, if that would work for you?
Geoff
I'm just playing around and going to try Michael Chua's Ampslab projects where he uses Pyle PDS442/Dayton H07E. He crosses that combo to 3 different 8" and 2 different 10" Even though the Pyle rolls off a little early, frequency response is very flat for not much money. Could add (or not) super tweeter later. He did active XO on all these projects but was going to take a stab at it with the RS225-8 and passive XO, mainly because I already had them.
I use https://apps.apple.com/us/app/spectrum-eye-rta/id794366989 "spectrum eye". I did pay $13 for it. Pretty good for checking out what's there, what's not in a pink noise spectrum.
Just putting down a marker for a confused question which we can doubtless solve.
Whatever are you trying to do, TubaV? Common enough woofer. Been done before.
https://www.parts-express.com/Dayton-Audio-RS225-8-8-Reference-Woofer-295-356
What does everyone think? About 8.2R and 15uF impedance correction? 😀
Whatever are you trying to do, TubaV? Common enough woofer. Been done before.
https://www.parts-express.com/Dayton-Audio-RS225-8-8-Reference-Woofer-295-356
What does everyone think? About 8.2R and 15uF impedance correction? 😀
Attachments
I forgot about XRK Audio's RS225 and Scan Speak build on this forum, silly me: what's used for the RS225 there?
Lower crossover point than 1200Hz, of course.
The RS28/RS225 speaker I was thinking of won its MWAF category a few years ago, not sure if the XO was public domain. Here's a page on a project using those drivers, from this Forum and XRK:
https://www.diyaudio.com/community/threads/dayton-rs-build.361256/
Geoff
Lower crossover point than 1200Hz, of course.
The RS28/RS225 speaker I was thinking of won its MWAF category a few years ago, not sure if the XO was public domain. Here's a page on a project using those drivers, from this Forum and XRK:
https://www.diyaudio.com/community/threads/dayton-rs-build.361256/
Geoff
