Bghead8che
Member
- Joined
- Jul 1, 2019
- Messages
- 31
- Likes
- 18
Attached are the on-axis and individual driver measurements.
The hi-end response deviates quite a bit from Ascend's official chart. However, I did find some independent measurements that are much closer to my measurements. I've attached some response images below for a baseline below. Unfortunately, I don't believe there are any Klippel measurements available.
I followed your suggestions above, however, I get some wonky bass response that is too loud and rolls off to fast. I'm not sure what I am doing wrong. Interestingly, the top two woofers extend to 1500hz and the bottom two extend to 120hz.
My steps:
1. Combine the 120hz drivers.
2. Sum all three ports together. Is the correct way to combine the three ports to go to trace arithmetic and sum ports #1 and port #2 using A + B? Then repeat the steps and use the Sum of ports 1 and 2 plus port 3, again using trace arithmetic and A + B? I summed the three ports using this method.
3. Then I reduced the summed port response by going to measurements actions, entering the negative offset, and then clicking on add offset to data. I'm curious what offset you would use. Do you align just the very tip? Or line them up around 15hz where they line up better? I aligned just the very end tip of the response curves.
4. I then summed the scaled the port response with summed low end woofer response by clicking on trace arithmetic A + B.
7. I then summed the two midrange 1500hz drivers by clicking on trace arithmetic A + B.
8. I think you left out a step on what to do after summing the midrange drivers. I simply added the summed midrange drivers with the summed port response + woofers using trace arithmetic A + B. I assume this is what I was supposed to do with the summed midranges.
9. I then entered filed out the baffle correction spreadsheet using the following settings:
I wanted to make sure I filled this out correctly. When you are measuring a tower speaker what should you put for the speaker location fields? I just used the lowest driver's location on the speaker (the bottom woofer). I then entered a 1" baffle radius as the sides (only) are curved in about an inch. Lastly, I filled in the piston's diameter by measuring 1/2 into the surround on one side to 1/2 the surround on the other. My understanding is the surround is the portion that sticks out in a circle relative to the rest of the driver. In my case I measured 6.63 inches.
10. I then imported the baffle response and clicked on trace arithmetic A * B (with A being Sum of the bass response and B being the baffle measurement).
11. I then spliced the files at 210hz as there seemed to be a natural match there between the on-axis and bass response.
My final response:
Like I said, my bass response seems to be way off and with a strange dip compared to the examples I provided. I'm guessing I added the two midrange responses incorrectly into the final response. I would imagine having two woofers, two midranges, and three ports also complicated things.
Thanks again for your help! I'm curious yet again how close our response will match to others. I'm also going to run the Ascend on-axis at a slightly higher position when I get time to see if we can match the response even closer than we have.
*** Update ****
I added the sealed woofer response files (Arendal 1723 Sealed (1) and (2) files). I sealed all three ports and measured the woofers. If we take the math approach the three ports are 2.56" wide and piston area of the four woofer is 6.63".
The hi-end response deviates quite a bit from Ascend's official chart. However, I did find some independent measurements that are much closer to my measurements. I've attached some response images below for a baseline below. Unfortunately, I don't believe there are any Klippel measurements available.
I followed your suggestions above, however, I get some wonky bass response that is too loud and rolls off to fast. I'm not sure what I am doing wrong. Interestingly, the top two woofers extend to 1500hz and the bottom two extend to 120hz.
My steps:
1. Combine the 120hz drivers.
2. Sum all three ports together. Is the correct way to combine the three ports to go to trace arithmetic and sum ports #1 and port #2 using A + B? Then repeat the steps and use the Sum of ports 1 and 2 plus port 3, again using trace arithmetic and A + B? I summed the three ports using this method.
3. Then I reduced the summed port response by going to measurements actions, entering the negative offset, and then clicking on add offset to data. I'm curious what offset you would use. Do you align just the very tip? Or line them up around 15hz where they line up better? I aligned just the very end tip of the response curves.
4. I then summed the scaled the port response with summed low end woofer response by clicking on trace arithmetic A + B.
7. I then summed the two midrange 1500hz drivers by clicking on trace arithmetic A + B.
8. I think you left out a step on what to do after summing the midrange drivers. I simply added the summed midrange drivers with the summed port response + woofers using trace arithmetic A + B. I assume this is what I was supposed to do with the summed midranges.
9. I then entered filed out the baffle correction spreadsheet using the following settings:
I wanted to make sure I filled this out correctly. When you are measuring a tower speaker what should you put for the speaker location fields? I just used the lowest driver's location on the speaker (the bottom woofer). I then entered a 1" baffle radius as the sides (only) are curved in about an inch. Lastly, I filled in the piston's diameter by measuring 1/2 into the surround on one side to 1/2 the surround on the other. My understanding is the surround is the portion that sticks out in a circle relative to the rest of the driver. In my case I measured 6.63 inches.
10. I then imported the baffle response and clicked on trace arithmetic A * B (with A being Sum of the bass response and B being the baffle measurement).
11. I then spliced the files at 210hz as there seemed to be a natural match there between the on-axis and bass response.
My final response:
Like I said, my bass response seems to be way off and with a strange dip compared to the examples I provided. I'm guessing I added the two midrange responses incorrectly into the final response. I would imagine having two woofers, two midranges, and three ports also complicated things.
Thanks again for your help! I'm curious yet again how close our response will match to others. I'm also going to run the Ascend on-axis at a slightly higher position when I get time to see if we can match the response even closer than we have.
*** Update ****
I added the sealed woofer response files (Arendal 1723 Sealed (1) and (2) files). I sealed all three ports and measured the woofers. If we take the math approach the three ports are 2.56" wide and piston area of the four woofer is 6.63".
Attachments
Last edited: