SpeakerTalk

Alex · Introductory Contributor Joined: 27 Jul 2006 Posts: 5

Hi, Have B110s and T27s and consructing spkrs based on Coda design. I see that Falcon offer c/o to original Coda spec. ( £9.50 ) these would be fine but would prefer to wire up myself.... would much appreciate layout and values of components. Also wire spec. for inductors if it is necessary to make these up.
Thank You
Alex

proffski · Posted: Thu Aug 24, 2006 5:45 pm Post subject: Re: Coda crossover

All you need to know is on this most excellent website already!
If you missed the technical bit have a long browse on: http://hifiloudspeakers.info/Anatomy/Anatomy.html

You will then see not only original KEF information regarding the Coda, but pictures as well as details regarding the crossover components, cabinet etc from the KEF CS1 Kit. All you could possibly want.

A suberb source of knowledge and information...

ColinR · Posted: Thu Aug 24, 2006 8:32 pm Post subject:

proffski · Posted: Thu Aug 24, 2006 9:16 pm Post subject:

What? Me? Wrong? Embarassed

Never been known!

Trouble with assumptions that using Acoustic Butterworth would come as obvious to all and sundry! Why stop at second order crossover?

Small increase in cabinet volume within reason is beneficial without causing too much havoc in the bass region.

Good Luck!

Gary · Posted: Fri Aug 25, 2006 10:44 pm Post subject:

This is a great site and all but sometimes I have no idea what people are talking about. Embarassed

On the other hand, I learned recently that you hold a screwdriver by the thick end, not the skinny end. Rolling Eyes

_________________
Sometimes I lie awake at night, and I ask, "Where have I gone wrong?" Then a voice says to me, "This is going to take more than one night."
-- Charles M. Schulz (as Charlie Brown)

proffski · Posted: Sat Aug 26, 2006 12:05 am Post subject: Weller.

Hi Garry!

Pro Noblem! Being moved to paper pushing for a year I found it a shock when I picked up my trusty Weller Soldering Iron by the wrong end... Confused

Damned good site though eh?

Gary · Posted: Sat Aug 26, 2006 1:24 am Post subject:

Yes, I've grabbed an iron by the wrong end, too! Know how to prevent bad blisters? Soak the burn in Javex bleach and water!

Fantastic site! Smile

_________________
Sometimes I lie awake at night, and I ask, "Where have I gone wrong?" Then a voice says to me, "This is going to take more than one night."
-- Charles M. Schulz (as Charlie Brown)

terry · Posted: Sat Aug 26, 2006 10:18 am Post subject: Could be better

Thanks all. Very Happy

Site could be a lot better though if I could find the time to publish the wealth of contributed information sent to me. Embarassed

Sorry about that folks. Sad

ColinR · Posted: Sat Aug 26, 2006 10:19 am Post subject:

+ ------------L1----------------------I--------------------------------- +ve
...................................................... I
...................................................... I
...................................................... I
.................................................... C1
...................................................... I
...................................................... I
...................................................... I
...................................................... I
- ----------------------------------------I -------------------------------- -ve

A half section
_________________
This post or any other information supplied to this website or any other by myself is not available for any form of commercial purpose i.e. to hi-fi magazines or as sales and marketing material for sleezeBay or Audiodogging pimps and the like.

proffski · Posted: Sat Aug 26, 2006 2:31 pm Post subject:

2nd order 12db octave...

JimN · Posted: Sun Aug 27, 2006 12:08 am Post subject: Coda crossover

Hi,
A small point worth mentioning is that with half section networks the drivers are usually connected out of phase. However, the Coda units are connected in phase.
I assume the B110 is SP1003 and as such it might be better to use the CS1A crossover, and rear mount the driver. The CS1 crossover is better suited to a front mounted SP1057/SP1032 combination.
Regards,
Jim

proffski · Posted: Sun Aug 27, 2006 12:50 am Post subject: Re: Coda crossover

Ah yes, but look at the design, it is 3rd order with the clever ab stuck on.
18db octave with the inevitable phase anomaly. Therefore that is correct!
So, all the answers are in the website after all... As expected.
Yum!

JimN · Posted: Sun Aug 27, 2006 8:55 am Post subject: Coda crossover

Hi,
Yes, but I was referring to the original Coda crossover (2nd order, 12dB/octave). It is usual to connect the units out of phase with 2nd order networks, but KEF, it seems, chose to do otherwise and probably with good reason.
The CS1 and CS1A crossovers are, as you say, correct and were only really mentioned as possible improvements, depending on the B110 type.
Regards,
Jim

proffski · Posted: Sun Aug 27, 2006 11:03 am Post subject: Re: Coda crossover

Interesting, a fact I had not been aware of!

I'll dig up mine and do some tests with pink & white noise as well as musical input.

Now look at what you have started! Laughing

Alex · Introductory Contributor Joined: 27 Jul 2006 Posts: 5

Many thanks to all who responded to my crossover queries....info. most helpful and a useful intro. to a very excellent site. One has also to include the to and fro banter re. screwdrivers and first aid advice on the treatment of soldering iron burns. Handy to know that!
I'm a new kid to this game (but an old one) with pretty scant knowledge on matters technical or theoretical but capable of following constructional details. No soldering burns (yet!!). However, interest in making x/over coils has run aground and evaporated since turning up a web site " Wouter's Homebrew Crossovers" on http://retro.co.za/audio/xover.html
Full details on coil construction but complicated.

Has anyone any info on coil suppliers....I understand that neither Falcon nor Maplins stock them now.

Regards. Alex.