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Posts posted by KT88
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The gaskets shape looks like in the first picture Bob has posted. But the material looks identical to the second photo.
I must add some info. My post from yesterday evening was very late
after work and I actually did not remember how the driver looked
directly after removing from the cabinet ten days ago. Now I can remind
that it had shown one plain and seamless surround, which was on the
same level as the metall basket because of the mounting compression.
And I was wondering if this gasket - on the same level - is
sealing well, because the material of the gasket does not give a
flexibel feel. It´s more like that from a harder cardboard.
But now, it is not only divided into 4 quarters of the gasket. It is
also about 1 mm more thickly than the edge of the basket. This would
mean that it develops a permanent counter acting force to seal
constantly well for a long period of time.
To me that explains two aspects, first is that I am sure I would have
noticed the four sections 10 days ago (which did not show up), but much
more important, the material seems to be flexible! in a good but slowly
way, still after 29 years.
Today I will make a picture of the gasket in is momently shape. Than I
will assemble one driver back to it´s mounting board and do a second
photo after removing it again in lets say a day or so.
If it seals well and the gaps disappear I would think about not to add some material. We will see...
Heinz
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I have learned from several posts on this board, that a 100% sealed
gasket should be a must for optimized bass performance and a good SPL
delivered from the K33.. Today I wanted to reassemble my now nicely
refinished La Scalas. Then I noticed, that the gaskets (as a part of
the drivers) looks to be separated into 4 quater parts each driver.
Each quarter round shows a gap of about 1 mm to its neighbour quarter.
This causes definitely four unsealed areas of each driver.
(Unfortunately I can´t post a picture now cause the speakers are in my
office.)
Is it NOT necessary to have a perfect seal, or in other words, has this
design been constructed the way it shows now (the drivers are 29 years
by now)?
OR, was it intended to show one perfect round and has possibly shrunk
due to aging? If it is so I already have some material to fill the
gaps. Should I do so?
Thanks for helpful replies,
Heinz
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"What
now worries me is "where to put the tweeter?" The 511B would
leave no room to put it along side the mid (like your Trachorn
provides), and I really don't want the overall height of the speaker to grow an additional whatever-the-tweeter-is-in-inches."
Just a silly question from a laymans perspective.
Why is it possible to construct a horn loaded system with the tweeter alongside the squaker without having such issues like interference in the cross over region between mids and highs?
In most of conventional hifi speakers the tweeter
is vertically on axis with the midrange driver. Only some off them have
an slightly offset like the Proac but then it is mirrored between left
and right tweeter. On axis is argued with the benefit of avoiding
interference in the cross over region between mids and highs. Interference is
said to be more obvious to the ear in a horizontal configuration than
in the a vertical centered positioning of the tweeter above or under
the midrange driver.
Al Ks trachorn is not the first one I have seen in a alongside
configuration. Just remember EV Sentry 3 and stuff like this having
been very sucsessfull. Therefore my question does not mean any
critizism, I am just missing some understanding (and have never heard
an alongside the squaker construction personally)
Heinz
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"There are two versions of the ALK: There is the original version which
Al calls the Universal Type A Replacement, and what everyone else just
calls 'The ALK'. The network has a first order woofer section, 2nd
order midrange section, and a 3rd order tweeter section -- and uses
some of the best parts in the industry. This network is built and sold
by Al."
"... a simple solution: Take the things I liked about both
networks and put them in one design: 1st order woofer section, 1st
order midrange section, 3rd order tweeter section -- with adjustable
taps."
Dean, I learned that the bass and the treble section remains untouched in the ALKJr. Xover. Is this true also by its values?
And further, do you need other values for the cap of the midrange
section than in the ALK 2nd. order midrange design or does it stay
unchanged. And makes an additional coil in parallel after the cap in
series leading to the squaker the difference between the ALK and ALKJr.
design?
If the cap is about the same value, is it theoretically possible to add a switch which could take the mids coil in and out?
Just an idea because I have candle light situations as well as sometimes a party or just crazy moments to crank it up.
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Hi guys,
thanks for your thoughts. Very helpful.
My decision is:
1) Rebuilt the La Scalas at first without damping the K400 to avoid to
many changes at one time. It is a little more effort
to take the squaker out again somtime later, but I would like to listen
to the effects of the new Xover (and the wiring) first.
2) I will take my Kimber 4TC. Thanks TubeGuy having practised with
exactly the same wire by coincidence. I will use spade connectors
avoiding to disturb the terminals of the Xover. The stock wire is
allready 29 Years of age and the insulation feels fragilly.
3) I am considering the option of an midrange/tweeter upgrade. It
sounds very plausible and interesting, but probably not by altering
this La Scalas. As I am hot again on hornspeakers I would like to find
some old used Khorn with good substance regarding the woodwork. Then I
must not make changes to it´s cabinett and can put any squaker upgrade
on top of the corner horn that fits the low pass requirements. Thanks
Al and J.4Knee for your input.
All what I am doing here reminds me on my youth. When I was 19 I built
a Khorn, based on old construction papers with a 30" woofer and
slightly taller. Great sound (in the remembering), but made from
particel board and fired by very cheap electronics. Now I am 47 and
there is some money but not the time you wish to have (as most of you
will know).
Is the Altecs acoustical freq. cut off comparabel, say 400 or 500 hz?
I will post some photos after finishing (hopefully this weekend, between such football games).
Heinz
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Hi everyone
if your time allows, you may start here, if not, please have a look at my questions further down.
I am new to this board, but have read a lot of threats during the past
weeks. Very helpful and competent knowledge from enthusiasted people
who enjoy their hobby. BTW I have to appologize for my not so quite
good English. I live in Cologne, Germany.
My system includes Oracle Delphy turntable with SME, EAR 864 pre and
Mac 2102 amp. As I love vintage gear, I have restored Quad II Monos and
leaks stereo 20. Speakers are currently Tannoy Canterbury alnico with
the only change of one Mundorf silver cap in series to the tweeter.
Mundorf is based here in Cologne for my convenience buying and trying
his products.
Sometimes I use my old Quad ESL 57, it depends on the music and the
mood. I do not change the speakers every week. They will play ca. one
year or so an then I come back to another pair of my collection if
required. The trick: I do not consume for new stuff as my speakers
represent different approaches between the "you are there" and "they
are here" range of representation of music. And the chose of speaker
also determes what I like to listen to.
BUT NOW: Klipsch also counts for me to this very original and genuine
inventions in his own right. And my relation to Klipsch is a very
emotional one in a similar way, described on this board by a lot of
others (experience in youth, beeing overwhelming impressed etc.) I have
bought LaScalas 6 Years ago. They are built in 1977, with original
signature on the wood under the crossover positioning, from the person
who builts them. They have K55V (p) with K400 squaker and round alnico
T35a.
They have been about 2 years my favorized speaker system. Then I wanted
to "upgrade" them and bought some parts like solen inductors etc. TBH,
I was irritated and after a while disappointed about the result.
Harsh in the mids, without good stereo imaging, AND with a lost of there great charme and emotional level.
They went stored since 4 years now.
Now I know, I did things wrong, i.e. to use solid core inductors for
the midrange network (Yes AL K, I have read a lot (and probably learned
some) of your writing on your page.
I don´t want to waste your folks time with questions allready have been
treated here. But may be, that some topics are enriched with more of
your experience over the time to deliver an actual status quo.
Next weekend is the great moment, I will put my LaSalas together again.
They have been stripped of because of seriosly necessery refinishing,
to let them show again there wonderfully raw birtch finish. Some stupid
preowner had tried to "match" them with his mahogany board.
Now, cause everything is in parts, it offers the chance to rebuilt everything very carfully.
My Questions:
K400:
After reading here I can not make a decision for or against treating
the ringing. May be I must try both alternatives to match my own
taste. Just as a hypothesis I would like to consider, that the
add of damping material could cause some time smere due to store some
musical information? That would explain, why some of you have the
experience of a more dead sound with damping and some others point out
a slightly more vivid character without.
Otherwise the output level of a horn is sigificantly higher in
correlation to ringing or other sort of resonnance compared with
conventional speaker cabinets. So the influence should be relatively
small.
Your updated opinion regarding this issue?
Internal Wiring:
long discussed over here. My question goes the other way round: I
already have some spare meters of not to expensive Kimber TC4 and
Nordost flatline. Some experiences? Or should I take normal gauge
nevertheless?
Crossover:
No questions as I have received ALK universals yesterday. May be some
of you will say, thats bought without listening experience, but I must
start at a point and all I have seen has convinced me to do so. (on the
level of feedback here on the board as well as on the theoretical level
how this Xover is designed to show real flat impendance to the
speakers).
Thanks a lot for any reply on wiring and K400.
Heinz
How far must the K33 be sealed?
in Technical/Restorations
Posted
a second picture