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Type: Posts; User: daifanshi

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  1. Replies
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    Need Help GV, All my simulations were based on voltage...

    GV,

    All my simulations were based on voltage level and I used complex lumped element equivalent models for the drivers. For the local DA, the simulations needed to include the loading from the...
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    Need Help Hey GV, It's great that you're interested in...

    Hey GV,

    It's great that you're interested in the details and not looking for "hand waving" answers to the how Polk implemented the SDA. A lot of answers can be found in the crossover. No need to...
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    Hi Heiny9, FYI, the effect you are describing...

    Hi Heiny9,

    FYI, the effect you are describing with the second competing tweeter is called "combing" or "comb filtering". It's basically frequency dependent constructive and destructive...
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    Hi Altecman, It's great that you're not...

    Hi Altecman,

    It's great that you're not afraid to work on your speakers. This is good stuff!

    The original location of the tweeters near the upper corners of the cabinet would certainly...
  5. F1nut, I noticed these veiled attacks only...

    F1nut,

    I noticed these veiled attacks only appear from you when something even vaguely technical is presented. If you don't understand what I'm posting about, I'll gladly point you to resources...
  6. Instead of bribing and theorizing to get to the...

    Instead of bribing and theorizing to get to the end conclusion. The correct way to determine what is going on with the SL2000 tweeters is to make careful measurements of a physical sample. And they...
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    There are several excellent tweeters available...

    There are several excellent tweeters available under $50 dollars in the DIY market that will match or exceed the measureable performance of most tweeters designed in the earlier part of this century...
  8. You're right. If you push the balance all the...

    You're right. If you push the balance all the way toward the right speaker, you will observe that BOTH the dimensional and stereo drivers will produce the right channel information. The dimensional...
  9. Candyliquor35, You really need to do all of...

    Candyliquor35,

    You really need to do all of them to preserve the correct relative phasing of what Polk calls the "disappearing point source".

    If I may make a suggestion for simplifying your...
  10. Your mylars should be non-polarized, but if you...

    Your mylars should be non-polarized, but if you DC reverse bias a polarized cap enough, it will go "poof". Sometimes in a very spectacular fashion.

    But I'm not sure what will happen from an...
  11. Have you tried switching the polarities of your...

    Have you tried switching the polarities of your tweeters? The added phase shift from your 18dB/oct tweeter high pass filter may be producing a suckout near the crossover frequency.
  12. I'm happy you're resorting to name-calling. It...

    I'm happy you're resorting to name-calling. It must make you feel superior.

    Back to the subject. If the deep suckout (29dB is pretty deep) is happening at 3.0khz it's probably destructive...
  13. I looked at one case and that was the SDA 2B. ...

    I looked at one case and that was the SDA 2B. Now I haven't simulated all of candyliquors fixed for the various Polk models he's modified. But the SDA 2B doesn't appear to exhibit a suckout.

    Do...
  14. What's a "capacitator"? Is that anything like a...

    What's a "capacitator"? Is that anything like a capacitor?

    Anyways, I ran a few quick simulations of candyliquor's additional cap on the SDA 2B. What appears to be happening is that the...
  15. FYI They likely won't be fully ready for several...

    They likely won't be fully ready for several months. But I'll let others listen to them who are in the area (Silicon Valley).

    If somebody can help me with the logistics and has good connections...
  16. FYI Yes, but it may be a few weeks before I can...

    Yes, but it may be a few weeks before I can begin. I plan to start by modifying one speaker in steps and then do comparisons with the unmodified one for voicing purposes. Then I'll finish the...
  17. FYI Expensive high current amps are not necessary for...

    Expensive high current amps are not necessary for this application since the loads seen by the amplifiers will be the same as the raw drivers in whatever series/parallel combination they will be in....
  18. FYI Active Crossover schematic for SDA 2.3TL attached here

    After a few nights of work I was able to implement the passive crossover of the 2.3TL as an active network. The main 2nd order filters of the tweeter, dimensional, and stereo arrays are modeled...
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    H9, Block my postings please. It's something...

    H9,

    Block my postings please. It's something I want to do. And it doesn't hurt you personally. So why care?
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    I approach electronics with the view than any and...

    I approach electronics with the view than any and all things can be improved. I don't believe any particular design is sacred. If I think something is deficient, I will attack the problem. Often...
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    I used pspice to simulate the networks. The...

    I used pspice to simulate the networks. The driver models are guestimates but are close enough for the purposes of determining the basic crossover response.

    The "correctness" would refer to...
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    As you can probably guess, most of my speakers...

    As you can probably guess, most of my speakers are active. The main system consists of completely active dipoles like the Linkwitz Phoenix. Except mine have rear tweeters and different drivers. In...
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    I don't understand how this marketing paper is...

    I don't understand how this marketing paper is relevant. I've read it very carefully and there is nothing in there that I can find that says the SDA speaker system can't be realized with active...
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    Your not the only one. :rolleyes: Anyways,...

    Your not the only one. :rolleyes:

    Anyways, I've completed some simulations of the crossover in the 2.3TL and noticed that the crossover frequency is very low ~1.5kHz for a 2nd order crossover. ...
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    Really it's not complicated. I'm sure you've...

    Really it's not complicated. I'm sure you've created a Helmholtz resonator in your lifetime. Next time you're downing a bottle of your favorite lager, blow across the top of the bottle. Instant...
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