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Multi-Way Conventional loudspeakers with crossovers

KEF Q500 new crossover
KEF Q500 new crossover
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Old 18th April 2019, 07:26 PM   #81
wtnsmk is offline wtnsmk  United Kingdom
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Sorry, I wasn't clear. My question is:

In the current design, the mid-range driver polarity is reversed. But not the woofer or the tweeter. Are we planning to keep this or not or we're not sure yet?
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Old 18th April 2019, 07:28 PM   #82
Zvu is offline Zvu  Serbia
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We will see when we start to model the crossover. So we aren't sure yet but we will do what ever it takes to make it good/better than factory did.
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Old 18th April 2019, 07:35 PM   #83
wtnsmk is offline wtnsmk  United Kingdom
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Just curious, is it reversed in your LS50? But probably it doesn't matter in this case as your uni-q driver is different. Or is it got a same issue around 8K?
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Old 18th April 2019, 07:48 PM   #84
Zvu is offline Zvu  Serbia
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I really don't have a clue. I've made few measurements of raw drivers of my LS50 just to see what the drivers look like. I'm waiting for my friend to arrange renting of closed basketball court in elementary school nearby so we can measure it at 2.5m height and with gate at about 10-11ms.

What ever they've done, i think i can do better so i'm not relying on their design choices because i have different goals. I need the most accurate sound i can get out of them and they've made it "the smoothest sounding". That's not my cup of tea. I don't like my loudspeakers to be politically correct

On topic - every UniQ Kef has (more or less pronounced) dip at 8kHz. That is product of their tangerine phase plug and is present only on axis. Off axis it disappears. Here's measurement of my modified Kef R300 on axis, 15 deg and 30 deg off axis:

R300 0 do 30.png

Slightly modified your Q500 midrange frequency response looks like this - it should already sound much better because you don't listen your highs through midrange cone breakup:

Factory crossover
bez modifikacija.png

Slightly modified
blaga modifikacija.png

Last edited by Zvu; 18th April 2019 at 08:11 PM.
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Old 18th April 2019, 09:35 PM   #85
wtnsmk is offline wtnsmk  United Kingdom
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Quote:
Originally Posted by Zvu View Post
I just quoted you from last post on page 7.

Bottom line is that we don't need MF HF reversed polarity or LF MF reversed polarity when taking measurements used for deriving sim files.
5.zip should be the one holmimpulse - Google Drive
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Old 18th April 2019, 09:57 PM   #86
wtnsmk is offline wtnsmk  United Kingdom
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Sorry, I've uploaded the 8 where the LS and the LS MF are both covered. Can you please tell me how to check it?
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Old 18th April 2019, 10:56 PM   #87
rayma is offline rayma  United States
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Quote:
Originally Posted by wtnsmk View Post
Just curious, is it reversed in your LS50?
The tweeter of the LS50 is connected in reverse polarity.
Attached Files
File Type: pdf Stereophile_LS50.pdf (26.9 KB, 17 views)
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Old 19th April 2019, 07:56 AM   #88
Zvu is offline Zvu  Serbia
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Quote:
Originally Posted by wtnsmk View Post
Sorry, I've uploaded the 8 where the LS and the LS MF are both covered. Can you please tell me how to check it?
I really wouldn't know what you mean by covered or uncovered.

All you need to do is to connect all three drivers (normal polarity, + on + and - on -), put the mic on a stand on tweeter axis 1m distance and make those 5 measurements. Mic position and amplifier volume shouldn't be messed with during all 5 measurements. 3 pieces of wire, one for each driver, that sticks out of the cabinet so you can connect it the way explained in that PDF i posted before. I made .txt files from 5.zip you've uploaded and i don't get anything resembling a real situation.
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Old 19th April 2019, 11:06 AM   #89
wtnsmk is offline wtnsmk  United Kingdom
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Sorry what I meant by covered is I covered the hole on the back properly.

I measured with a way how you described it, I never touched any volume.
Anyways, I made a new measurement, uploaded here: holmimpulse - Google Drive

What I can't understand, in low freqs they all look similar.
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Old 19th April 2019, 12:29 PM   #90
Zvu is offline Zvu  Serbia
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That's because that amount of gating allows good resolution down to 300Hz. Everything under that frequency isn't right. Anyway, i think i'll manage to do something with these last measurements. I'll get back to you by this evening with results.
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