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Multi-Way Conventional loudspeakers with crossovers

KEF Q500 new crossover
KEF Q500 new crossover
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Old 10th April 2019, 09:14 PM   #21
Zvu is offline Zvu  Serbia
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You need to measure TS parameters exactly like the video shows. After that, you can return the drivers in to the cabinets and measure the impedances of individual drivers without crossover. You will need it for simulations later. Tweeter is always measured for impedance not for TS. Your woofer and midwoofer needs TS, you can measure it either by added mass or known cabinet volume method.

Last edited by Zvu; 10th April 2019 at 09:19 PM.
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Old 11th April 2019, 10:51 PM   #22
wtnsmk is offline wtnsmk  United Kingdom
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Could you please have a look at the measurements so I can put the speaker back together?

measurements - Google Drive
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Old 12th April 2019, 08:16 AM   #23
Zvu is offline Zvu  Serbia
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You haven't added any mass to derive Vas. Or at least i don't see it on the pics. Look the dats video again.
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Old 12th April 2019, 08:55 AM   #24
wtnsmk is offline wtnsmk  United Kingdom
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I can see the Vas except on the tweeter's file.

Woofer:
Click the image to open in full size.

Midrange:
Click the image to open in full size.

Tweeter:
Click the image to open in full size.
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Old 12th April 2019, 08:58 AM   #25
Zvu is offline Zvu  Serbia
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I must have overlooked it somehow. Then that's it. Close the cabinets
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Old 12th April 2019, 09:11 AM   #26
Fabian85 is offline Fabian85  Germany
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KEF Q500 new crossover
I own myself a pair of Q500... did not touch the crossover but changed the internal wiring (original really sucks... thin cheap wires like "door bell wires" as we call them in Germany) to PTFE silver plated (twisted AWG 16 for Woofer and twisted AWG 24 for Uni-Q driver) and output terminals to WBT 0703 Cu. Initially thought about doing some crossover rework but as sound already improved with these minor mods I stopped doing anything more...
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Old 12th April 2019, 09:52 AM   #27
wtnsmk is offline wtnsmk  United Kingdom
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Quote:
Originally Posted by Fabian85 View Post
I own myself a pair of Q500... did not touch the crossover but changed the internal wiring (original really sucks... thin cheap wires like "door bell wires" as we call them in Germany) to PTFE silver plated (twisted AWG 16 for Woofer and twisted AWG 24 for Uni-Q driver) and output terminals to WBT 0703 Cu. Initially thought about doing some crossover rework but as sound already improved with these minor mods I stopped doing anything more...
Thank you, I was already looking for better wires, so your advice is very useful!
I will check all of these wires.

However, I will finish the measurement, run some simulation, try to design something better, and if it looks much better on paper, then I will try and then share my results with everyone.

Can you please confirm these are the wires what you advised?

24AWG: PTFE silver plated copper wire, 7/0.2 | Hifi Collective
16AWG: PTFE silver plated copper wire, 19/0.30 | Hifi Collective

Last edited by wtnsmk; 12th April 2019 at 10:08 AM.
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Old 12th April 2019, 10:02 AM   #28
Zvu is offline Zvu  Serbia
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I have recreated response you've measured close enough.

Kef Q500 bas.gif

When you measure frequency response of raw woofer driver in cabinet, we will merge it with this sim at around 100Hz and get quasi anechoic file for simulators.

Last edited by Zvu; 12th April 2019 at 10:21 AM.
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Old 12th April 2019, 10:12 AM   #29
Fabian85 is offline Fabian85  Germany
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KEF Q500 new crossover
Quote:
Originally Posted by wtnsmk View Post
Thank you, I was already looking for better wires, so your advice is very useful!
I will check all of these wires.

However, I will finish the measurement, run some simulation, try to design something better, and if it looks much better on paper, then I will try and then share my results with everyone.

Can you please confirm these are the wires what you advised?

24AWG: PTFE silver plated copper wire, 7/0.2 | Hifi Collective
16AWG: PTFE silver plated copper wire, 19/0.30 | Hifi Collective
Bought mine from other source (in Germany) but from the data they are the same.
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Old 12th April 2019, 12:51 PM   #30
wtnsmk is offline wtnsmk  United Kingdom
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Quote:
Originally Posted by Zvu View Post
I have recreated response you've measured close enough.

Attachment 749228

When you measure frequency response of raw woofer driver in cabinet, we will merge it with this sim at around 100Hz and get quasi anechoic file for simulators.
Thanks, I was playing with the data in VituixCAD too.

Hopefully I can do the frequency measurement next week, I'm still waiting for response from universities as I hope I can use they anechoic chambers.
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