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In Reply to: RE: Hiraga Altec crossover question posted by Joe Roberts on July 04, 2016 at 06:44:29
Hi Joe,
I appreciate a lot your treads!
I have a special question, to a rare A5 assembly, called VitaVott.
I have all components (excellent A5 cabinets, french scool, H 1505 tar filled with brass troat, excellent vitavox s2 and ak15/40 drivers, and eventually also coral 104/T500 Fostex)
and need some help for the xover..
Can I start with a Hiraga x-over? I have quit all parts (8 ohms).. I am wondering if it works... the woofer is 8 ohm the driver is nominally a 15 ohm..
May you suggest me what to do? I'll star with a two way assembly.. and eventually add the stw later
A mad idea..?
Thank you very much..
Alex
Follow Ups:
Hi alex,
Sounds like a great project but I know nothing about the Vitavox parts. Few Vitavox units found their way over here. I heard a few Vita systems sounding good in Korea, where some vintage guys love Vitavox.
The Hiraga Xxover was intended to make the A5 more or less a two way, possibly with a super tweeter added very high, 10kc + for air and sparkle.
If you are going to use an actual tweeter, you can start with a standard 12dB crossover and add the tweeter where the midrange horn runs out.
The HF peaking feature of the Hiraga can be adapted for other systems but you need to know the response of the midrange horn. The idea of a series resistor to lower output bypassed with a capacitor calculated for the frequency where the HF response of the horn starts to roll off was/is common in pro sound.
These days such EQ is probably more commonly included in analog or digital crossovers rather than passive xovers. Modern controlled directivity horns are engineered to get the desired pattern, then EQ is used to get smooth frequency response.
In short, the Hiraga approach might be useful with your Vitavox but could require some adjustment
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Free your mind and your ass will follow -- Parliament/Funkadelic
Thank you very much joe,
The VV component's I have are the same used in the thrilling Vox olympian, and I am very curious to hear if this unusual combo can work..
on the paper a interessing mixed bag, the openess and speedness of the s2 with the full bodied 1505 H, and the incredible toneful ak15/40 (similar to the westrex 2080) in the A5 horn.. for the ultrabass I'll add in the future a 18" sub.
But in first instance, I hope to achieve a perfect seamless 2 way speaker..:-)
Best wishes and thank you again :-)
I have no doubt that you have the ingredients and inspiration for an excellent system. You will get there.
I suppose we Americans can't complain about not having Vitavox when we have most of the Altec, WE, etc. although it is getting dispersed across the planet in recent decades, finding homes where it is most appreciated.
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Free your mind and your ass will follow -- Parliament/Funkadelic
.. thanks for the encouragement, joe, the way to heaven is still very long ...
alex
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