SpeakerTalk

[ajswinscoe]

hi.im trying to build my own speakers.based on kef 104ab.basicly building new cabs and sourcing second hand drive units.ive managed to find a pair t27 tweeters,a pair of sp1022,a pair of sp1014 and 1 only 1039 drive unit.and a pair of abr units and a pair of 104 crossovers.obviously i dont need the sp1014 or sp1022.but do need another sp1039 unit.and wonderd if anybody had one that they may wish to sell or better still swap for any of my unneeded units.also ive discoverd that there is a big difference between the 104 and 104ab crossover.does anybody have any advice on how i can modify my 104 crossovers to the same standard as the ab version.ie. what is required component wise? what order does everything go in?or is it even worth my while.or would i just be better off replacing and upgrading my caps?my cabs are 35inches tall 12inches deep and 10inches wide.the bottom 5 inches or so will be sand filled.if anybody can help me out id be eternaly gratefull.and im new to speaker building and am still trying to make sense of the technical side of it so please forgive me if i seem a little confused by any technical data anybody may have regarding the crossovers.

[proffski]

your thread so difficult to follow with the lack of upper case font and sporadic use of punctuation.with no spacing between full stops and start with the following sentence reading the text makes my brain hurt very much.grasping your query is a bit of a hard task indeed.why not make it easier for us by putting some effort into the question?
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill

[ColinR]

Got out of the wrong side of the bed Andy?

I thought it was me with the prospect of Stafforshire Areoterrorist Glidershite's open days causing excessive ddisturbance and distress to myself and my elderly neghbours, for whom excessive noise causes cadiovascular and other deleterious physiological effects.

Turning up the music doesn't help either as the areoterroristsr low flying causes mechanical excitation of the bungalow's roof structures.


If you're not glidershite, you're welcome to pop round sometime for a 104/104aB tutorial and an opportunity raid my bits box .
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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]

Not at all Dear Chap!

I like most of us belong to many forums just get tired of those unwilling to utilise their skills and knowledge of etiquette regarding the Queens English which as it happens is my second language.

I do suffer from mild dyslexia and trying to read mail written by lazy buffoons is a guaranteed to expose my nasty side.

The inability to utilise upper case as and when desired and needed is a cardinal sin, an insult and equivalent to a well aimed anaemic wet fart in a drizzly wet November evening waiting at the bus stop…

The current trend in communication within so many forums is the total disregard for even the most basic attempt at respect for the remaining readership; it to me manifests as rude, selfish, aggressive atypical laziness!

I love this hobby, I always endear myself to those asking for help and advice, but only when they can be bothered to utilise some decorum in their keyboard skills!

I find it totally disrespectful, arrogant, rude and irreverent to behold a cry for help written by what appears to be a lazy chimpanzee!
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill

[proffski]

OFF TOPIC! "Mea culpa, mea maxima culpa!"

I live a few miles from a local airport, no problem with the noise at all.
Even the amateur aviators at weekends.

The constant thwack, thwack of footballs being kicked by the local army of CHAVS is by far the most annoying noise in these here parts!

We get many helicopters flying to the local Army Camp from Hereford here, not to mention a plethora of Hercules transport aircraft in groups as much as six. A SYMPHONY OF SOUND!

Must do a spectral analysis of the glorious harmonics generated sometime soon.
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill

[ajswinscoe]

I do apologise for my lack of keyboard skills, however I was under the impression that these sites were for enthusiasts with the same interests. I did not post the question to be insulted. I have only just gone on-line and I am still finding my feet.

Many thanks to Colin for your offer of help, greatly appreciated.

Hope this makes better reading for you Andy.

[proffski]

Utterly splendiferous old chap! That's the spirit!
Now, what was the problem?
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill

[ajswinscoe]

[proffski]

Greetings & Cordial Felicitations!

There are at least two regular contributors to this fine fettled fantastic forum who are much better qualified at answering your query regarding the 104aB loudspeaker and various variants thereof!

The difference is as far as I know all in the HF T27 section to tame some characteristics of the SP1032 T27 device.

Nothing too complicated and all the answers are on this most excellent site.

I have flirted with different cabinet sizes for the design in the past and had plenty of success as well as failures.

The best was a marriage of two designs incorporating a B110 in the final product; I cheated by getting a real audio engineer design the crossover and other features. It was briefly used in a recording studio in Cheltenham but the T27 was ever so prone to going O/C under these conditions, also upgrading the capacitors was found to be mandatory as the Amcron DC300 was mutilating them by a matter of small internal explosions… Bummer!

I shall PM you (Personal Message) regarding the ABRs in due course, please be patient as I am having a colleagues college reunion over half term which necessitates the consumption of many Single Malt Whiskeys… Just do not go out and spend your hard earned dosh on units just yet.

Bear in mind that the 104aB is not a dB generator and as some of us have found out, and that with caution BIG amplifiers do indeed do these and other KEF series of loudspeakers many favours regarding control, stability and authority!

I’m sure that Colin and the venerable sage Speaker Guru can elucidate to a far greater extent than my ramblings.

Await my communiqué!
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill

[proffski]

Sincerest apologies and a grim warning!

Just to show how dangerous the consumption of Laphroaig & Macallan can be!

I have PM you regarding the ABRs...
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill

[ajswinscoe]

Hi all. My project is comming to an end. Ive only got to make a pair of grills. The speakers sound great. Im very very pleased with them. they look fantastic too. The cab design was down to my cousin. Dave whelan. He has a great talent. For those who are intersted in the build ill give you a short report.
Cabs are 35in tall 12in deep and 10in wide.
constructed from 22mm thick mdf. Front baffle 6mm mdf with drive unit cutouts bonded onto 22mm mdf with circular cutouts. thus creating a recessed baffle. Not perfect but very close. Abr unit doesnt sit totaly flush inside the recess. But as i said its very close
The cabs are sand filled at the bottom adding approx 5kg
They are braced halfway up.
The units are placed as follows. Top b2oo. Centre t27. Bottom b139.
dave and i both love the look of the kef callinda so we went for the same layout.
cabs are finnished in ash real wood vaneer. using 50mm edging vaneer iron on. Its very time consuming to get it right but well worth the effort. And a couple of coats of beeswax to give them a lovely smooth finnish.
Inside the cabs a bitunen dedshete on every pannel. And are padded out with 40mm thick sponge wadding.
They are sat on spikes also.
The drive units i have used are sp1022s. b139 abr units supplied by the very kind proffski and t27 tweeters.
Crossovers are 104 with caps replaced with wilmslow audio supersound polyprop caps. Hopefully though ill be able to upgrade further still to the mighty 104ab crossover.
I will post again soon with a sound report. And if anybody wants any pics send me a pm and ill send you some.
Id also like to take this oppurtunity to say a huge thank you to proffski for going way out of his way to help me.hes given me shed loads of advice, facts and specs. And even a mint pair of b139s. What a star.

[ajswinscoe]

Ps. Im still struggling to find a single b200 sp1039. I have 1 but need another to make a pair to replace the sp1022s with. As the sp1022s arent really what i want be using in the size of enclosure that i have.
So if anybody has a spare theyd like to sell send me a pm. Youl make a happy man even happier.

[proffski]

I've just found a pair at a friends house.
He may take some persuading, so please do not hold your breath, I'll keep on pestering!
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill

[ajswinscoe]

Andy to the rescue again. Thanks. Ill keep my fingers crossed. .