Planar Speaker Asylum

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RE: Don't the inductors act like chokes?

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In Reply to: RE: In my opinion reviewers that say... posted by gymwear5@hotmail.com on August 31, 2010 at 06:19:10

perhaps they don't, i'm asking 'cos i don't know, but that's what i would have thunk.

I put the chokes right at the input, before the crossovers decide what signal go to the bass, what signal go to the tweets...

But, yeah, don't the inductors behave like chokes? :-7

WF.
This rovers crossed over
to the >>>SUNNY<<< side of the street

Follow Ups:

Inductors have parasitic capacitances. - Al Sekela 15:55:05 09/01/10 (0)
Just as capacitors have parasitic inductances, and resistors have parasitic inductances and capacitances.

All real-world components have some of the other component types mixed in because there are no ideal materials and real materials require these things to take up a lot of space to do their functions.

The parasitic capacitance of a crossover inductor would allow RF to get past it. The choke would block some of that sneaky RF.

In technical terms, the resonant frequency of the inductor plus its parasitic capacitance determines where it stops being an inductor and starts being a capacitor. The bigger the inductance, the lower the resonant frequency.
RE: Don't the inductors act like chokes? - neolith 09:03:04 08/31/10 (1)
A choke is an inductor; the term is used depending on the function of the inductor. For the sloppiness of terminology that is used in this forum, the terms choke, inductor and coil are synonymous.
�

I plan to procrastinate my demise for as long as possible. In the meantime, I practice by putting off all the little stuff.

Edits: 08/31/10
- Remember; Capacitors used to be called Condensers, voltage was electromotive force, and hertz was c.p.s. - cfb 13:35:39 08/31/10 (0)
  "cycles per second" and uuf or mmfd was micro-microfarads before picofarads pF came into usage. Handy to know if one is reading old texts.
RE: Don't the inductors act like chokes? - gymwear5@hotmail.com 07:45:24 08/31/10 (2)
Yes,a choke is a series device that adds increasing impedance to the circuit at high frequencies. Remember these are RF chokes - so they should come into reasonable impedance a 50kHz or so. Since a panel doesn't have the series inductance a normal woofer does, I can understand application of the choke - and an air core inductor really shouldn't harm anything - on a planar magnetic bass panel. In my biamp MMG's the tweeter is protected with a 50microF Cap.
- RE: Don't the inductors act like chokes? - warmfires 08:17:11 08/31/10 (1)
  Forgive me for showing my dumb-side, but i don't follow how a 50uF capacitor would protect the MMG tweeter, when the stock cap value was 12uF. Would the 50uF cap not allow lower frequencies to move up to the tweeter, perhaps over loading it?
  
  I ask because i have just removed the fuse and fuse holder on my MMGs, but am worried to try PG's crossover using 30 uF Obliggatos. I was about to post a question on the forum about this, but i might as well ask it now.
  
  I also ask because my experience with MMGs is limited, and i would not mind learning from you guys. Perhaps the tweeter is robust enough to not need a fuse even with a large cap with values like 50uF, do share?
  
  Warmly yours,
  
  Warmfires.
  This rovers crossed over
  to the >>>SUNNY<<< side of the street
  - RE: Don't the inductors act like chokes? - gymwear5@hotmail.com 10:32:49 08/31/10 (0)
    Sorry, I was a little scarce in details... I biamp my MMG's so the signal coming out of the Amps speaker terminals are high passed to the tweeter and low passed to the woofer. The big cap on the tweeter is to protect it from a turn on transient from the power amp - I use to drive the tweeter elements with a tube amp - no DC passed though the output xformer there, and my SS replacements are not suppose to have DC at the output, but BSTS, I always say. FYI I'm using Crown Amps (XTI2000) with built in DSP for the xover.... and a bit of EQ, and bass panel limiting while I'm at it - sometimes I really like to crank it up! The MMG panels can handle instantaneous peaks of over 1000 Watts.
RE: Don't the inductors act like chokes? - JBen 07:40:20 08/31/10 (0)
That's what I thought. To a large degree, they must because, in the beginning, it actually was the inductor in the Tazmon Capless tweak that gave me part of these goods.

The "beer theory" that I have is that, by using the matching sets of chokes, one "synchronizes" the panels. In fact, if I use the chokes for the tweeters only, the midrange and up improve the imaging. When I add the ones for the low panels, it all "falls in place". Furthermore, I suspect that this happens for "phasing" reasons.

Now, I buy cheap beer, so...

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