.............
As a teaser, typical room response of 3-way floorstanders, (both Wilson Audio)
I just saw this Juha,
I'm not sure that flat in room response is that pleasant to listen in the long run. Usually there is roll off of around 6dB from 200-20000Hz. Flat could well be quite bright sounding. Anechoic averaged measurements Atkinson does are tilted about 4dB upwards 1000Hz-20000Hz. Those are averaged so who knows how on axis measurement looks like.
Plutone
I agree. Better with a negative slope like DIY Plutone by Tony Gee:
Tony Gee Plutone
I agree. Better with a negative slope like DIY Plutone by Tony Gee:
Tony Gee Plutone
An externally hosted image should be here but it was not working when we last tested it.
I was looking at bass response!
But I like flat upper end of a single speaker as well. Perhaps because of my impaired hearing. Never heard Wilson's but most KEF Uni-Q speaker have too soft high treble for me.
Actually the Wilsons' room response goes 4-5dB down 3-10kHz. Measured room response is always affected by interference from boundaries, but still doesn't show decay spectrum, which is important for the perceived sound balance too. I have noticed that 1-4kHz decays slower in most rooms of what I have measured.
My dauhter's room has concrete walls and big windows, but is large.
Shared album - Juha Sirkka - Google Photos
But I like flat upper end of a single speaker as well. Perhaps because of my impaired hearing. Never heard Wilson's but most KEF Uni-Q speaker have too soft high treble for me.
Actually the Wilsons' room response goes 4-5dB down 3-10kHz. Measured room response is always affected by interference from boundaries, but still doesn't show decay spectrum, which is important for the perceived sound balance too. I have noticed that 1-4kHz decays slower in most rooms of what I have measured.
My dauhter's room has concrete walls and big windows, but is large.
Shared album - Juha Sirkka - Google Photos
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Here is horizontal radiated power at angle of 180 degrees (+/-90 degrees in regard to on axis):
And here are individual curves:
And here are individual curves:
My PSM XO.
I will measure original some time though. Probably when i open them to put PSM XO in.
I will measure original some time though. Probably when i open them to put PSM XO in.
Those are measured responses but since Holmimpulse can't show more than 3 measurements, i just imported them in LspCad. Radiated power is derived from those measurements from picture no.2 It is a combination of all 10 measurements.
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Here's sim vs measured response. Black sim, red measured.
On axis
30 degrees off axis
Slight differences are mainly from measurement conditions since for deriving sim files i had 10ms gate time and in my home i can achieve 4-5ms at best.
Not too bad 🙂
On axis
30 degrees off axis
Slight differences are mainly from measurement conditions since for deriving sim files i had 10ms gate time and in my home i can achieve 4-5ms at best.
Not too bad 🙂
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I guess that's how it is when one tailors the sound per price tag and not per driver capabilities. How can you sell the bigger model that is more expensive if there's no difference in performance from smaller model - only actual difference being dynamic capability.
Klaus Heinz is very good designer so i'm sure he is aware of every detail regarding performance of his loudspeakers.
If you live in North America and you do not want to spend a lot of money with KEF LS50 or you want UNI-Q 5.25" drivers to make your DIY speakers...
KEFdirect: $299
KEF Q150 Bookshelf Speaker Pair
Amazon.com: $334
Amazon.com: KEF Q150 Bookshelf Speakers (Pair, Black): Home Audio & Theater
Crutchfield: $550
KEF Q150 (Black) Bookshelf speakers at Crutchfield.com
KEFdirect: $299
KEF Q150 Bookshelf Speaker Pair
Amazon.com: $334
Amazon.com: KEF Q150 Bookshelf Speakers (Pair, Black): Home Audio & Theater
Crutchfield: $550
KEF Q150 (Black) Bookshelf speakers at Crutchfield.com
Adding braces inside and changing crossover might be everything it needs. Now would be a good time for someone to buy them and measure raw drivers in factory cabinets so we can tinker with it a bit.
Of course. Point of crossover should be determined by measuring. No problem going up to 400-500 Hz if distortion is too severe down low making it a classic three way.
Has there been any sort of conclusion about the modified crossover(s) mentioned in this thread? I see three schematics for LS50, some renaming (PSM) without a specific reference to a schematic, and lots of confusing digression not related to the original post.
I have a pair of LS50 on the way (big discount right now), and these mods are very intriguing. The poor phase at crossover is disturbing, in theory.
I have a pair of LS50 on the way (big discount right now), and these mods are very intriguing. The poor phase at crossover is disturbing, in theory.
Everyhing you need to know if you want to upgrade is linked in the first post. If there is something that is unclear to you, please specify and we'll go through it again.
The rest of the thread is friendly technical chat and i don't see why would that be a problem for anyone. What conclusions do you need ?
The rest of the thread is friendly technical chat and i don't see why would that be a problem for anyone. What conclusions do you need ?
Thank you, that helped. I clearly see the schematics and measurements from three contributors now.
I'll run in my new speakers, then take another look at this. This will be my first Kef loudspeaker, so unknown territory.
Thanks for your effort and contributions.
I'll run in my new speakers, then take another look at this. This will be my first Kef loudspeaker, so unknown territory.
Thanks for your effort and contributions.
As of today, black or wood grain Q150's are available from Amazon for $299, with free Prime shipping (though not next day). Even eligible for Amazon Smile charitable donation.
Bill
Bill
Yes, I know. Days ago:
KEF Q150 for $300 - Kefdirect.com, Amazon.com and Crutchfield.com
And now we have some KEF Q150 measurements too:
KEF Q150 for $300 - Kefdirect.com, Amazon.com and Crutchfield.com
And now we have some KEF Q150 measurements too:
An externally hosted image should be here but it was not working when we last tested it.
