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Old 29th February 2012, 07:05 PM   #1
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Smile h-frame visaton b200 + alpha 15

hi at all,i am italian,and is my first time i write in a forum, and i am non practice here.
The question is about an open baffle that i have built from the site of m artin king, an h-frame design, using one alpha15a and one visaton b200.
At the moment i use 1,5w triode ampli for b200 , a behringer crossover and a nad for the power the alpha. Now i wish suggest, for a passive crossover , i mean the value and schematic of choke , or cap or resistor .
in the mjk project http://www.quarter-wave.com/Project08/Passive_Crossover.pdf"
Martin use goldwood and jordan, and i think are not the same value of components .....or i am wrong?
and also....a simple tweeter for this OB?
sorry for my bad english
ciao
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Old 29th February 2012, 08:18 PM   #2
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You can get the values for the B200 from the Visaton no-box:
Visaton - Lautsprecher und Zubehör, Loudspeakers and Accessories
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 2nd March 2012, 01:21 PM   #3
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very intersting link , thanks
and which tweeter do you suggest ?
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Old 2nd March 2012, 01:55 PM   #4
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Hi , are you from Florence ? In that case we can meet each other

You can try also a line level crossover , by decreasing the value of the capacitor at the input of your amplifier .

I see that visaton b200 is rated at 96 dB sensitivity , so you'll need a tweeter that makes the same 'noise' ! I know only the Audax TW025 line that has a silk soft dome rated at 96 dB ; Sica makes a good one rated at 94 dB for 1/3 of that price ,around 20 €.
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Old 2nd March 2012, 03:09 PM   #5
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hi pico, near florence.The sica is the Z009220 - TWEETER SICA 80W, 8 Ohm, 93dB ,cupola in seta trattata ?
DOME TWEETER 80W 8Ω 93dB

Cod: SIC-Z009220

DOME TWEETER 80W 8Ω 93dB

Cod: SIC-Z009220

DOME TWEETER 80W 8Ω 93dB

Cod: SIC-Z009220

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Old 2nd March 2012, 06:08 PM   #6
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yes ,that's the one .Now , it occurs to my mind that Sica has a new line, with neodimium magnet , which is slightly more efficient ,about 94,5 dB .
It's the one with the crossed wire for protection of the dome .

Someday we'll meet...
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Old 5th March 2012, 02:50 PM   #7
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thanks pico, i am searching now ...... i have also 4 audax ht210a2 , from project the burlotte, and sometimes change with visaton .... there is no so much difference..the b200 are a little better i know. i have also other 2 alpha15a more, so i could made one other h-frame with 2 audax ..... but, are you from florence?
ciao
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