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Old 7th July 2004, 09:11 AM   #1
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Default Update on " THORS TACKHAMMER 5" coax

Well, i had cut out the dustcap on the Vifa P13 and I retrieved the audax 10 MM tweeters from the mailbox about 2 hours ago . A few minutes with the dremel and a cutoff disc and they were out of thier "can" mount and are gorgeously tiny. I couldnt wait so i set up 1 p13 bare and crossed a tweeter in beside it with a 3 UF cap, at about 6 KH and replaced one of the Jordan JX92s with it. Fired it up and have been listening for coupla hours . Right away , too hot on the top. So I went to a 2.2 UF, about 9KH. BETTER!, but still too hot. Of course without an enclosure of any kind the ballance is skewed to the top BUT this thing shows incredible potential!
The little tweeter is FAB! Sweet and pure even tho too hot! Now I need HELP Where do i find info on how to pad down the tweet by 2 and then 4 DB? Its 8 ohm. I want to use a fixed L pad of high quality resistors then play with caps some more . Miked @ 3 ' its +- 1, maybe 2 Db, 500 to 16 k. And its not coaxial yet. I am overly sensitive to flat responce in the trebble and want to roll it off a little. I am STOKED! Tomorrow ill see if I can get one mounted coaxially, as near field (43") I can hear the center shift around side to side as freq changes. Im amazed this took me 4 years to try, thats how long ive had the p13s sitting around. This thing might end up as good or better than the Jordans The cap is an AXON foil.
I love the look of the 24 carat gold dome mad had the tweets for 12.95.
Its 2 AM and i cant tear myself away I will keep you posted
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Old 7th July 2004, 06:13 PM   #2
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Default please help:)

I really need help on the L pad Resisters! is there s simple nomograph or something? Regards
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Old 7th July 2004, 06:30 PM   #3
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Just use a cheap Lpad and adjust to your liking. Then measure the series and parallel resistance of the Lpad setting and replace it with quality resistors.
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Old 7th July 2004, 10:58 PM   #4
GM is offline GM  United States
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http://www.lalena.com/audio/calculator/lpad/

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Old 8th July 2004, 06:08 PM   #5
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Default crossovers

hey gm,

i've been designing crossovers using this applet and have a few questions.

heres the setup...altec 806/811,jbl le5, electrovoice evm15l (le5 is in an edgar 300 mid horn now)

http://uk.f2.pg.photos.yahoo.com/ph/.../ph//my_photos

its crossed at 500hz and 5khz 1st order... i like the purity of first order and p.r.a.t is also important to me but i want to roll the woofer off quicker as it contributes too much to the midrange at present.......as 4th order intruduces no phase shift ( zero degrees) is it compatable with a first order mid/treble

furthermore could i add a jbl 2405 crossed 4th order and still keep a first order mid.

sorry if this sounds stupid..as far as crossover design goes i am an electro-acoustic numpty

many thanks

gary mcdonnell-thomas

p.s heres another calculator http://ccs.exl.info/calc_cr.html#first
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Old 8th July 2004, 11:22 PM   #6
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Default update on the update:)

SUCKSESS! I have 1 of "THORS TACKHAMMERS" finished. i
superglued a magnet to the rear of the micro tweeter. the
pole piece is down in the voice coil former so far, i needed
something to space it out. Then i just stuck the mag to the
pole piece . Works perfectly so now im listening to a coax
finally! . I was concerned that removeing the dust cap would
affect the freq res of the p13, but it didnt faze it! Am back
to a 3UF cap wide open and its sounding SPLENDID. Im
astonished at how easy this was but i DID start with 2
GREAT drivers . The integration thru the XO seems FLAWLESS!
IT dosent sound like a coax ! It sounds like a good FR unit!
Now i have to get it in an enclosure of some kind . I have an
unused pair of the little Nohr 3.0 Drums here . HMMM I
could cut the hole bigger(its a 3") and try that. I would have
to make a new Baffle buts thats par I adore the shape of
these little drums and if it works it would be great
Currently there is an FE 85 Fostex in them. Gave the original
tangband away. Didnt like it .
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Old 9th July 2004, 12:10 AM   #7
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Old 9th July 2004, 02:20 AM   #8
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Default Re: update on the update:)

Quote:
Originally posted by THOR
I have an
unused pair of the little Nohr 3.0 Drums here . HMMM I
could cut the hole bigger(its a 3") and try that. I would have
to make a new Baffle buts thats par I adore the shape of
these little drums and if it works it would be great

Sounds like a project I'm working on.......or so I'm told


BTW Gazzamongo, I have that exact same bookshelf from IKEA, same grey color too. I use it for media though.
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Old 9th July 2004, 04:19 AM   #9
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Default hybrid four door

please share ur project with us these kind of off the wall things can be very exciting
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Old 9th July 2004, 06:41 AM   #10
Variac is offline Variac  United States
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Now I'm thinking about my 15" drivers with 4" voice coils.

I could put a 3.5" midrange on the pole piece and one of your little tweeters on the mids polepiece: hoooeee!!!
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