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Old 7th November 2017, 03:50 PM   #1
mfitzgibbon is offline mfitzgibbon
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Smile my journey

So years ago I got caught up in the SET flea power amp thing. To go this way you need high output speakers. I built a 2A3 set amp and BLH using the Fostex 208 standard drivers. I thru every mod you can find at those drivers and after years of trying to like them they just don't cut it. Started looking at different drivers and found the Mark audio alpar 10. A guy was selling a pair that had the enable process done to them. Got them and made an adapter plate to put them in my blh. Now I did not think this would work that well but wow they sound awesome. The mark audio driver is very detailed and has great tone. Much smoother than the fostex. Next I added a HIVI planer tweeter with a 6.8 uf cap in series and boy is this a sweet combo. Really puts the sparkle detail and space on top that was missing. I know I'm not breaking new ground here but I hope this can help others. My 60 year old ears really like this combo. The HIVI tweeter really pulls it together. Also the Alpar puts out a great deal of bass for such a small driver in this blh. Enjoying music again.
MIke
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Old 7th November 2017, 07:05 PM   #2
Dr1v3n is offline Dr1v3n  United States
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Welcome! I had a very similar experience. Which model HIVI Planar did you got with?
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Old 7th November 2017, 07:11 PM   #3
picowallspeaker is offline picowallspeaker  Italy
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Whoa ! ! Same as me !! It must be contagious ...

I started with something like a Pioneer, same as Bofu
Sounds like...To-fu !


Imagine going further, adding tilted lobes with 2nd order and so on..
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Old 7th November 2017, 07:15 PM   #4
norman bates is offline norman bates  United States
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Lol, close to my journey, now i use mid woofer wide open plus single capped tweeter.
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Old 7th November 2017, 07:26 PM   #5
picowallspeaker is offline picowallspeaker  Italy
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In that first project, after trying with cap, I used an " off the shelf " filter.
The 50 V-6.8 uF cap fried after some days...

Nowadays it sits unfinished with a 20 cm Vifa and a Monacor spx21 with 20 cm waveguide
I mean, it works well but there's no usage .
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Old 7th November 2017, 07:28 PM   #6
picowallspeaker is offline picowallspeaker  Italy
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...Selling it! My very first pair of speakers, made 20 years ago
1000 $, give or take !
Still place for impairments, fun guaranteed !
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Old 8th November 2017, 02:39 PM   #7
mfitzgibbon is offline mfitzgibbon
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Default HIVI

Using the rt1ca. Entry level with a cheap Dayton cap. Wondering if a better cap would take things even higher. Believe me its very good now. Some of the real hi end caps can cost way more than the tweeters. Want to keep things sane. The Obbligotto caps look interesting and not insane prices.
Mike
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Old 10th November 2017, 01:14 AM   #8
Dr1v3n is offline Dr1v3n  United States
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I've had good luck with 2uF 250V 1% polypropylene caps... Prices seem very reasonable for those Obbligato caps you mentioned too!

Last edited by Dr1v3n; 10th November 2017 at 01:17 AM.
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Old 10th November 2017, 04:45 PM   #9
midrange is offline midrange  United Kingdom
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my journey
"Next I added a HIVI planer tweeter with a 6.8 uf cap in series"

What frequency does the tweeter come in at?
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