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KEF Owners Thread - Page 207

post #6181 of 6592
Quote:
Originally Posted by DS-21 View Post

Then take the measurements. smile.gif

Also, see what happens over more angles, and you'll "see" what I heard.

What you'll see is a smooth rolloff, rather than a flare-up at the crossover point.

As mentioned, the Q100s aren't available for measurement at the moment (and by the time I get the drivers back, they won't be a stock implementation), though I did take a couple more of the Q700:

30 Degrees:


60 Degrees:


1/2m, 24dB/octave smoothing. Assuming that the Q100 gets the 2-4kHz band perfect, I'd still call it a stretch to say the Q700's polars are "markedly inferior". I'd generally reserve that kind of statement for something with a serious mismatch, but YMMV I suppose. While not necessarily ideal, as you note, it's not exactly your average two way with a 7" mid/woofer crossed at 2500Hz either.
Edited by Steve1981 - 9/7/13 at 6:53pm
post #6182 of 6592


Can someone help me and tell me if the mid/twetter driver is sharing the same cabinet space with the woofer?
Also, it looks like the woofers have different cabinet volume. Is that correct? If so, then they would have a different tunning?
post #6183 of 6592
Quote:
Originally Posted by syphon View Post

Thank you for the answers guys. At the price point the Q900's are at, am I missing out on maybe a better speaker? I like the full range even though I have the sub. I'm sure nice bookshelves and an added 2nd sub would do the trick, but I'm set on towers. Any opinions from anyone who owns these?

I have no regrets about the Q900's I purchased for my den's 2-channel. I use them without a sub and they sound simply spectacular. Granted, I use them primarily for music, however the occasional movie I play through them is very, very pleasant as well. If you're going to bias towards HT (with a second sub), then I think you could absolutely use smaller towers/bookshelves. If the additional cost is of little importance though, then why not go big? You might gain a little peace of mind...biggrin.gif
post #6184 of 6592
Quote:
Originally Posted by Steve1981 View Post

*** though I did take a couple more [measurements] of the Q700: ***

Thanks! Your vertical scale is excessively compact, but nonetheless your measurements still show large off-axis energy flare-up (the dreaded "midrange mushroom cloud") at the bottom of the tweeter's passband, and correlate well with what I actually heard comparing the Q100, Q300, and Q900. True, not as bad as a flush-mounted tweeter with the same size midwoofer and crossover frequency. But I don't judge things on that steep a curve! wink.gif

For comparison, here are some basically unsmoothed (1/48th oct smoothing) measurements including a full polar map of a Q900 concentric as used in a bespoke bookshelf speaker, with significant crossover upgrades compared to the Q900:



Tell me based on the measurements where the crossover is. wink.gif

(HINT: not 1.2kHz. That bump appears to be some sort of resonance in the driver.)

I'll have more information and listening impressions on those later...
Edited by DS-21 - 9/11/13 at 2:51pm
post #6185 of 6592
Quote:
Originally Posted by RicardoJoa View Post



Can someone help me and tell me if the mid/twetter driver is sharing the same cabinet space with the woofer?

Doubtful. What it looks like to me in that picture is that the Uni-Q is in a tubular subchamber. Or perhaps the cutaway is intentionally not accurate.

As for volume differences, if the two bass drivers are tuned differently I'd expect that's intentional.
post #6186 of 6592
Quote:
Originally Posted by DS-21 View Post

For comparison, here are some basically unsmoothed (1/48th oct smoothing) measurements including a full polar map of a Q900 concentric as used in a bespoke bookshelf speaker, with significant crossover upgrades compared to the Q900

Not too shabby looking! wink.gif
post #6187 of 6592
Quote:
Originally Posted by DS-21 View Post

Thanks! Your vertical scale is excessively compact, but nonetheless your measurements still show large off-axis energy flare-up (the dreaded "midrange mushroom cloud") at the bottom of the tweeter's passband, and correlate well with what I actually heard comparing the Q100, Q300, and Q900. True, not as bad as a flush-mounted tweeter with the same size midwoofer and crossover frequency. But I do
Quote:
Originally Posted by DS-21 View Post

Thanks! Your vertical scale is excessively compact, but nonetheless your measurements still show large off-axis energy flare-up (the dreaded "midrange mushroom cloud") at the bottom of the tweeter's passband, and correlate well with what I actually heard comparing the Q100, Q300, and Q900. True, not as bad as a flush-mounted tweeter with the same size midwoofer and crossover frequency. But I don't judge things on that steep a curve! wink.gif

For comparison, here are some basically unsmoothed (1/48th oct smoothing) measurements including a full polar map of a Q900 concentric as used in a bespoke bookshelf speaker, with significant crossover upgrades compared to the Q900:



Tell me based on the measurements where the crossover is. wink.gif

(HINT: not 1.2kHz. That bump appears to be some sort of resonance in the driver.)

I'll have more information and listening impressions on those later...
n't judge things on that steep a curve! wink.gif

For comparison, here are some basically unsmoothed (1/48th oct smoothing) measurements including a full polar map of a Q900 concentric as used in a bespoke bookshelf speaker, with significant crossover upgrades compared to the Q900:



Tell me based on the measurements where the crossover is. wink.gif

(HINT: not 1.2kHz. That bump appears to be some sort of resonance in the driver.)

I'll have more information and listening impressions on those later...
Hi DS,

Do you have any pics of the Q900 Uni-Q in the bespoke cabinet?

Would you mind letting me know who designed the crossover and cabinet?

I've been considering replacing my iQ10 LCR's with a custom designed Q100 5.25" Uni-Q possibly mated with a 6" midbass driver. Basically a budget R300. A Q900 Uni-q in a bookshelf speaker also sounds interesting.

Thanks
Dan
post #6188 of 6592
Quote:
Originally Posted by dftkell View Post

I've been considering replacing my iQ10 LCR's with a custom designed Q100 5.25" Uni-Q possibly mated with a 6" midbass driver. Basically a budget R300.
*cough* http://forums.audioholics.com/forums/pros-joes-systems-gallery/84268-steve81s-theater-6.html#post986217 *cough* biggrin.gif
post #6189 of 6592
post #6190 of 6592
Ha, thanks! Just read through it. Looks like he's using existing q100 drivers. I know you could buy them a while back. Hopefully you still can.

I wonder what would be a better choice, the q100 + midbass or a q900 uni-q alone?
post #6191 of 6592
Quote:
Originally Posted by dftkell View Post

Ha, thanks! Just read through it. Looks like he's using existing q100 drivers. I know you could buy them a while back. Hopefully you still can.
As far as I'm aware, it's officially frowned upon, and the parts depot that was known to sell them now requires a serial number to buy the drivers. Also FWIW last I checked, the raw drivers were $260/pr, while the complete speakers could be had for $400 a pair.
Quote:
Originally Posted by dftkell View Post

I wonder what would be a better choice, the q100 + midbass or a q900 uni-q alone?
Not sure how the ER18 driver I'm going with would compare from 500Hz on down (the Q100 driver obviously isn't particularly good down low), but one upside of the 3-way arrangement is that the 5.25" driver's excursion will be kept to a minimum so it'll be a fairly stable waveguide for the tweeter. I'm also unaware of a cost effective source of the Q900 driver.
Edited by Steve1981 - 9/12/13 at 5:36am
post #6192 of 6592
Hi Steve, I spaced last night when I read the link and didn't realize it was actually your build. Good luck with it. Keep us posted.

Dan
post #6193 of 6592
Quote:
Originally Posted by dftkell View Post

Hi Steve, I spaced last night when I read the link and didn't realize it was actually your build. Good luck with it. Keep us posted.

Dan

No worries, my mind isn't exactly its keenest at that hour either wink.gif

On the upside, with the I've enlisted on this, I've got pretty high hopes that things will turn out well (certainly better odds than if I were going it alone biggrin.gif).
post #6194 of 6592
can you tell me if this a good deal?
This includes:
1 Q9 black ash center channel speaker ($315 when new)
2 Q7 black ash 3 way tower speakers ($600 each when new)
2 Q-Compact black ash rear bookshelf speakers ($130 each when new)

If purchased as a set I will include the wall mounts for the rears and the Monster Cables for the towers and center.

Asking $700 for everything above; I had over $2100 invested in all of this when it was new. Please email me if interested.
post #6195 of 6592
Quote:
Originally Posted by DS-21 View Post

Doubtful. What it looks like to me in that picture is that the Uni-Q is in a tubular subchamber. Or perhaps the cutaway is intentionally not accurate.

As for volume differences, if the two bass drivers are tuned differently I'd expect that's intentional.

Maybe the picture is intentionally inaccurate. But based on that picture, it seems like all the cabinets "share" some volume because there is openings from one cabinet to adjacent cabinets. biggrin.gif

So perhaps they do share cabinet space to increase cabinet volume and output capability. biggrin.gif

Regardless, their measurements look great and they sound great. wink.gif
post #6196 of 6592
I am trying out a pair of Kef LS 50's over the next month. Has anyone had any experience with the break in period for these speakers? Thanks.
post #6197 of 6592
Speaker break in is a myth. I own 5 ls50s. There was no break in needed.
post #6198 of 6592
@ synthetic shrimp: Thanks, I am really happy to hear that (no pun intended)!
post #6199 of 6592
Kef US indicates that the R series needs above average break -in. Don 't know about the LS50s which are incredible speakers.
post #6200 of 6592
Quote:
Originally Posted by Orwellflash View Post

I am trying out a pair of Kef LS 50's over the next month. Has anyone had any experience with the break in period for these speakers? Thanks.

So far they sound as good as the first day I got them!
post #6201 of 6592
Quote:
Originally Posted by wse View Post

So far they sound as good as the first day I got them!
Coming from an 800 Diamond owner (actually three).
post #6202 of 6592
Quote:
Originally Posted by wse View Post

So far they sound as good as the first day I got them!

I checked your system spec and you have to be like the richest dude on the planet.
post #6203 of 6592
Hey guys, I have a kinda stupid question in regards to my kef q200c. Can I set it up with the wires to the hf post? cuz the lf post is broken this is a loaner center for now. Plz help thanks.
post #6204 of 6592
Quote:
Originally Posted by tristan82 View Post

Hey guys, I have a kinda stupid question in regards to my kef q200c. Can I set it up with the wires to the hf post? cuz the lf post is broken this is a loaner center for now. Plz help thanks.
As long as the jumper is in place , no problem.
post #6205 of 6592
Thanks jima gonna try it now
post #6206 of 6592
Quote:
Originally Posted by SyntheticShrimp View Post

Speaker break in is a myth. I own 5 ls50s. There was no break in needed.

Just one out of many myths. biggrin.gif

People will hear and see A LOT of things.
post #6207 of 6592
Even though AV Science sells KEF speakers, I wasn't really familiar with them until a couple of days ago at Cedia. They make quite a quality line of speakers !!
post #6208 of 6592
Quote:
Originally Posted by wse View Post

So far they sound as good as the first day I got them!


I'm looking forward to hearing them. Will be streaming from an oppo 105 through creek destiny amp to the ls50's.
post #6209 of 6592
I know I've said this a few times before, but why couldn't KEF include a protective magnetic removable grille for the LS50?

I know some care and some couldn't care less.

They could have made the grille an "add-on" for those you desire them.
post #6210 of 6592
Quote:
Originally Posted by NAIM101 View Post

I checked your system spec and you have to be like the richest dude on the planet.

I wished, I just saved and drive a 20 year old car smile.gif
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