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In Reply to: RE: Inductor? posted by djk on October 12, 2015 at 14:29:12
Please explain further. I knew about using a cap to cut off the low frequencies from the Heil, but I thought an inductor was used in crossovers to cut off the highs.
Incidentally, the original Heil is 96 dB efficient, but the Heil II is 92. It was my thought to go with the II for that reason.
Follow Ups:
The HF must be at least 6dB more efficient for this method to work.The parallel inductor works similar to the series cap, but without capacitor quality issues (it's usually easier to get a small good quality inductor)
Since the inductor is in parallel, it presents a dead short at low frequencies (hence the need for the series resistor). The resistor is essentially in parallel with the woofer at low frequencies, and can smooth out the impedance peaks for tube amps.
Edits: 10/13/15
DJK,
I know everything you're stating is 100% true, but surprisingly enough when I was looking for super-tweeters to use with my Sachiko/FE206E combo ---{ which I used before switching to Sachiko/PS220-8 combo }--- I tried four different pairs of large Heils with the them and despite the wide dB sensitivity differences on paper, nothing was needed to pad down the Heils when they were crossed in somewhere between 8KHz and 10KHz to their usable high frequency extension! In the end with John K's help I ended up using the Fostex T900a as my super-tweeters!
I'm listening to:
Thetubeguy1954 (Tom Scata)
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns --- High Sensitivity Speakers
The Heil is a nice tweeter, too bad it won't work in his application.The 100dB+ Beyma version would be fine (but $1200 a pair), any of those nice Fostex tweeters would be fine too.
Edits: 10/15/15
I have the 100dB+ Beyma version as well! I wanted to see if I preferred them to my similarly priced Fostex T900a tweeters. I used the 100dB+ Beyma TPL150H drivers ---{ which I purchased NIB from Hum4god here }--- for only 30 mins and decided I still prefer the Fostex T900a in my application, but while I'm not looking to sell them, I'd let them go for $700/pr. if someone here really wanted them...
I'm listening to: My Favorite Things by Joey Alexander
Thetubeguy1954 (Tom Scata)
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns --- High Sensitivity Speakers
It makes sense, and I get it now. Much appreciated.
neat way to do things
Karlson Evangelist
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