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Old 8th October 2007, 08:08 PM   #1
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Question KEF Chorale Improvement?

I've acquired a pair of KEF Chorales

http://hifiloudspeakers.info/Anatomy...e/Chorale.html

from a Thrift store a few years ago. Well, I was quite astonished in the beginning. But after a few days/years, I started to hear the problems that it had. It doesn't sound as good as the Tangent that my dad had even though they have very similar drivers (same tweeter, slightely larger woofer).

Anyway, here's a list of problems:
1) lacks midrange
2) the bass shakes the ground but my ears can't really hear much of it.
3) the high end not as smooth or warmer as my Tangent or Spendor LS3/5A

Lastly here's the original crossover:

http://hifiloudspeakers.info/Anatomy...lery/index.htm

Could anyone find ways to improve the speaker?
Any help would be appreciated
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Old 9th October 2007, 10:09 AM   #2
sreten is offline sreten  United Kingdom
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Hi,

Other than updating the capacitors there is not much you can do
that is cost effective. Ideally the notch circuit (2mH 6.4 R DCR -
16uF) should be individually tuned to the particular driver, but
this is difficult without measuring equipment.

FWIW the individual drivers would probably sell on e-bay for more
than the complete speakers as KEF drivers are much sought after.

A drastic redesign would put the bass driver in a transmission line
and add a midrange driver, but using modern units would be better.

TBH I've never found the B200 that good. My second-hand Musical
Fidelity MC2's (go for a song if you can find them) are far better than
any of the speakers you mention in nearly every area. Its much
better to start off with something very good and tweak.

e.g classics are the original Rogers studio 1's and LS7's

http://vancouver.craigslist.org/ele/443239457.html

Detune the port somewhat and a pair of decent stands .....

/sreten.
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Old 19th September 2012, 09:11 PM   #3
Zen Mod is offline Zen Mod  Serbia
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P10 - Q for you (you must keep that first place in posting )

I just acquired set of Chorales , with drivers in decent condition

except my madness for all things speakers , I don't know why

anyway - one of T27 is having sorta loose motor ensemble from magnet plate ; what sort of glue (?!) was used to secure it to magnet plate ?

I know the drill - keeping an eye on alignment , with sine gene ...

TIA
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Old 19th September 2012, 09:49 PM   #4
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Tangent TM3 & TM1 both use the same drivers as the Chorle, so you must have gotten RS2, or RS4 from your dad (similar but with Audax midbass)-- one of my favorite speakers of the day, and John Greenbank had a significant impact on my loudspeaker design knowledge. Note that the grill cloth material on the Tangents could now be worth more than everything else.

Cross-over and more elegantly built boxes gave the TM1s & TMs a distinct edge over the KEFs with equivalent drivers.

If you want to keep them, rebuild the box & XO... but as Sreten says it actuallymakes more sense to flip the drivers (people in love with their vintage boxes (ie IMF TLS50/Linn Sara) have pushed the resale value of these drivers well beyond their sonic worth) and use the proceeds to start from scratch with modern drivers. Somewhere in between would be to flip the T27 and use the B200s in a FAST.

Picture & circuit of TM3 XO (AFAIK the same as TM1) attached.

dave
Attached Images
File Type: jpg tangent-tm-3XO.jpg (49.0 KB, 131 views)
File Type: gif TM3-XO.gif (7.2 KB, 129 views)
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Old 19th September 2012, 09:53 PM   #5
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Quote:
Originally Posted by Zen Mod View Post
anyway - one of T27 is having sorta loose motor ensemble from magnet plate ; what sort of glue (?!) was used to secure it to magnet plate ?
The diaphram VC has come loose from the bezel or the bezel has come loose from the magnet?

If the later time to toss (i have some T27 here with dimpled domes, cost you postage (& coffee when i come visit (if)). If the former then it was a sticky glue that still allowed them to be removed and a new butterfly assembly mounted for a "recone". I'd use Zig 2-way glue as a 1st try (both surfaces let it sit 5 min before assembly). It is really hard to misalign them as they are keyed.

dave
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Old 19th September 2012, 10:06 PM   #6
Zen Mod is offline Zen Mod  Serbia
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tnx P. , for both the offer and glue tip

it's luckily entire bezel (if by that you're meaning on black plastic ring ,carrying 'fragm & VC) , so little glue will sort the things

coffee , beer and Stone BBQ - any time

while we are at it , how you (partially) compare xover you just posted , with this , also originating from your pile of files :
Attached Files
File Type: pdf Kef104abXO.pdf (107.8 KB, 15 views)
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Old 19th September 2012, 10:32 PM   #7
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The Chorale will have one of the simpiler DN13 XOs.

Sounds like you have pre-fire Chorales. The T27 i was describing have a metal bezel.

dave
Attached Images
File Type: jpg t27.jpg (23.1 KB, 124 views)
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Old 19th September 2012, 11:02 PM   #8
Zen Mod is offline Zen Mod  Serbia
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yep

it is SP1032 , exactly like pictured

seems that we just aren't using same terminology , blame on me
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Old 20th September 2012, 12:51 AM   #9
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Zen Mod View Post
anyway - one of T27 is having sorta loose motor ensemble from magnet
plate ; what sort of glue (?!) was used to secure it to magnet plate ?

I know the drill - keeping an eye on alignment , with sine gene ...

TIA

Hi,

What is best for repair often has a lot more to do with repair skills,
and the application of common sense than the original details.

T27 diaphragm detachment is very rare, if its still aligned I'd use
minimal quantities of "superglue" and some jig that pressed on
the surround to spread the "superglue" to best effect.

Or not .....

Click the image to open in full size.
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Old 20th September 2012, 01:04 AM   #10
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Quote:
Originally Posted by sreten View Post
Or not .....
Given that it was designed to be replacable that is the option i'd pick.

dave
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