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  1. Replies
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    I use a Behringer Ultracurve Pro deq2496 for the...

    I use a Behringer Ultracurve Pro deq2496 for the RTA. It has 61 bands so basically there is a separate band for every two notes of the musical scale.

    https://youtu.be/mYZVFjxkMq8
    ...
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    Actually, you can't not eq for room problems when...

    Actually, you can't not eq for room problems when that is the only space you have to develop/test in.

    Whatever problems are in the speakers and in the room will show up on the RTA and will be...
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    No, the test is inconclusive in so many ways. ...

    No, the test is inconclusive in so many ways. The results may be so small as to be hearable, but not readily discernable on the meter that is in continual fluxuation of "whole numbers." ...
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    I made up a charge coupled first order (two 10...

    I made up a charge coupled first order (two 10 mfd Spragues, 2.2 meg resistor, 9 volt battery) and connected it to a Heil.

    The RTA shows no discernable difference in the spectrum of pink noise...
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    It's not that it "doesn't work," but maybe it...

    It's not that it "doesn't work," but maybe it doesn't work exactly the same as a non-charge coupled version without the extra caps and dead/missing battery..., and isn't that what we are trying to...
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    Not quite the same. Nobody builds a regular...

    Not quite the same.

    Nobody builds a regular crossover by building a charge coupled crossover and leaving out the battery, and without comparing a "dead" charge coupled crossover to a regular...
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    Thanks for the invitation.

    Thanks for the invitation.
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    They look very nice. Is there any way that we...

    They look very nice. Is there any way that we can hear a video? Do you have some recording method of quality?
  9. Note that the 18"s are completely sealed off with...

    Note that the 18"s are completely sealed off with the foam core. It costs some deep bass, but I'm thinking that cutting it away from the ports would help that.
    https://youtu.be/2NUSWBgk0-E

    ...
  10. Thinking Outside of the Box Leads to Closing the Box

    I've been dealing with a suck-out in the Ethyl Mermans ~250Hz. I get it on both the 18" and 10" (not so much on the L300s), close in frequency (adjacent band on the RTA 1/6th octave apart) and I...
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    Doesn't matter the absolute polarity of the...

    Doesn't matter the absolute polarity of the components, only the relative polarity after the crossovers that can shift their phase and it's not always easy or clear and cut. I use an RTA and look...
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    There are mistakes! From discussion here, seems...

    There are mistakes! From discussion here, seems like about 1 in 50 is backwards. I have a pair of 2241Hs and they are different in that one moves the cone out with + on red while the other goes in...
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    Yes, designed them myself with lots of tweaking...

    Yes, designed them myself with lots of tweaking and some dumb-azz luck due to a miswiring that sounded "right" (the black art everyone talks about).

    I don't quite understand how the 6.8 through...
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    Latest and Greatest! ...

    Latest and Greatest!

    http://www.audioheritage.org/photopost/data//500/medium/ScreenHunter_211_Jul_30_11_40.jpg

    Joni Mitchell doing "Woodstock" on the Ethyl Mermans. This is why I call them the...
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    Just have to know where to look. I used these on...

    Just have to know where to look. I used these on the Ethyl Mermans for the 16 ohm 2251Js. You can also get them on ebay if you look for Fender L-pads. Ebay doesn't list the impediance, but uses...
  16. Just a reminder.

    Just a reminder.
  17. Come See My Garden Railroad on June 23, 2019 in Orange County, CA

    Tortoise and Lizard Bash Garden Railroad (T&LBRR)

    Sunday, June 23, 2019

    1:00 P.M. – 4:00 P.M.

    Santa Ana, CA 92705

    PM for Address
  18. ~12 feet to camera and ~10.5 feet to SLM. Maybe...

    ~12 feet to camera and ~10.5 feet to SLM. Maybe just a couple dB louder than I typically listen to this song at because it makes a better recording.
  19. Guinevere by CS&N Through the Ethyl Mermans

    Guinevere by CS&N with SLM displaying the peak "A-weighted" levels for normal listening levels through the Ethyl Mermans.A standard CD through an Oppo95 and Yamaha RX-Z9 receiver. No subs, eq, or...
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    Another problem with the Nyquist method that I've...

    Another problem with the Nyquist method that I've never seen addressed, is sampling white noise.

    Assuming the white noise source consists of all frequencies from 20 Hz-20kHz there is more than a...
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    A good video, but does not address what I asked...

    A good video, but does not address what I asked about in the least (e.g., once the signal is sampled, how is that sample assigned a "1" "0" pattern and how can that pattern be mathmatically...
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    Doesn't even begin to explain what's going on,...

    Doesn't even begin to explain what's going on, and neither do other articles.

    Fine on the sample rate..., but what happens next?

    How is that sample quantified into a series of 1's and 0's and...
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    Would still come through the resistor at a...

    Would still come through the resistor at a reduced level.
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    Thanks Rob. I think you have the 0.9 mH as 900...

    Thanks Rob.

    I think you have the 0.9 mH as 900 mH (or such).

    Note that the 12 mfd on the Heil actually pulls it quite low into the 2251 territory. This was to get the best transition based on...
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    Thanks Rob! I don't think that you are...

    Thanks Rob!

    I don't think that you are considering the effects of the inductance of the 2241H (R2) on the 2251J and that it's slope is steeper than shown. This inductance seems to change the...
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