Get HolmImpulse.
-
Get an exclusive sneak peek into our new project. >>> Click Here
Crossover update project.
2
Project
I plan to update the crossovers on a pair of Zaph Audio Waveguides. I slightly modified the design with help from this forum to accommodate some different speakers that I already had on hand. A while back I measured the speakers with a radio shack mic and a one of those universal calibration files that are floating around. Not sure how accurate it was but there appeared to be some fairly significant issues with the design. I now have a better mic and plan to re-measure the speakers and update the crossovers. I am hoping that I can post some speaker measurements here and get some help again with the modifications.
![]()
Speakers
Waveguide project
Tweeter - Seas 27TDFC
Design Woofer - Seas CA18RNX
Modified Woofer - Seas P18RNX/P, H1350
Crossover (Modified Perfectionist)
![]()
Modified
- C3 => 6.2uF
- L4 => 1.75 mH
- R5 => 10 ohm
Cabinet
Design- 19.5 liters
Modified - 15 liters
Questions
- What program should I use? I have REW, and trueRTA, and could probably get access to LSP CAD if that would help?
- When I measure the speakers, should I measure both together? and where should the mic be placed?
Thanks in advance to anyone how can help me out with this project. I'm pretty excited to finally get these babies dialed in!
I plan to update the crossovers on a pair of Zaph Audio Waveguides. I slightly modified the design with help from this forum to accommodate some different speakers that I already had on hand. A while back I measured the speakers with a radio shack mic and a one of those universal calibration files that are floating around. Not sure how accurate it was but there appeared to be some fairly significant issues with the design. I now have a better mic and plan to re-measure the speakers and update the crossovers. I am hoping that I can post some speaker measurements here and get some help again with the modifications.
Speakers
Waveguide project
Tweeter - Seas 27TDFC
Design Woofer - Seas CA18RNX
Modified Woofer - Seas P18RNX/P, H1350
Crossover (Modified Perfectionist)
Modified
- C3 => 6.2uF
- L4 => 1.75 mH
- R5 => 10 ohm
Cabinet
Design- 19.5 liters
Modified - 15 liters
Questions
- What program should I use? I have REW, and trueRTA, and could probably get access to LSP CAD if that would help?
- When I measure the speakers, should I measure both together? and where should the mic be placed?
Thanks in advance to anyone how can help me out with this project. I'm pretty excited to finally get these babies dialed in!
1 - 8 of 8 Posts
If you'd like, you can measure the system now as is and try to make changes. But that'll be shooting in the dark. For instance, we know the tweeter is an LR2 slope xo at 2000hz. What if there is a big peaker at 2500hz? Maybe it's a break up peak. Maybe a rising response. If there is a big wide dip from 300 to 700hz, maybe the .5 woofer has to big of inductor. We don't know though.
The way coctostan described it is best. For now, might as well measure the system just to see what you have, if you'd rather start that way.
To measure, get the speaker as far away from any obstructions as possible. Even raise the speaker of the ground a little. Position the mic on axis with your listening plane at 1m (3.2ft) from the listening axis (tweeter most likely). If you have a very large are you can work in, back up to 1.5 or even 2m if you can. But you want to gate the measurements so there are no reflections from the room, so likely 1m will have to suffice.
Once you've done that, post the results and hopefully an expert can offer you some tips. I recently learned how to take measurements for a speaker. It's a lot of work. Getting them good is important. I have a small room. I moved ALL my furniture out of the room to finally get it right. You could almost say I was lucky my XO worked with my first measurements
![]()
The way coctostan described it is best. For now, might as well measure the system just to see what you have, if you'd rather start that way.
To measure, get the speaker as far away from any obstructions as possible. Even raise the speaker of the ground a little. Position the mic on axis with your listening plane at 1m (3.2ft) from the listening axis (tweeter most likely). If you have a very large are you can work in, back up to 1.5 or even 2m if you can. But you want to gate the measurements so there are no reflections from the room, so likely 1m will have to suffice.
Once you've done that, post the results and hopefully an expert can offer you some tips. I recently learned how to take measurements for a speaker. It's a lot of work. Getting them good is important. I have a small room. I moved ALL my furniture out of the room to finally get it right. You could almost say I was lucky my XO worked with my first measurements
1 - 8 of 8 Posts
