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Posted on: 9-28-07

Romy the Cat

Boston, MA
Posts: 9650



Thread: Adding one more spherical to Macondo.
           Reply: "I will try to take some measurements soon"...  

Very interesting.  I appreciate that you have exposed more of your listening sensations  - that give more objective information, letting to propose more accurately what might took place. In regard to what you say it might not be the “phase clicking” but rather a mild decompression of the upper range S2.

The S2 crossed at 3200Hz at 6dB and pushing in a 400Hz horn 1000hz of air does reaches at it’s bottom the region where a very slight touch of the “Horn Boom” takes place. It is a mild form of honk, very modest and very much not detectable when the channel is supplemented with sub 1000Hz channel.  It is possible that moving the crossover point from 3200Hz to 4800Hz you further up removed the S2 from the Horn Boom region.  (The Horn Boom is always accompany with compression)

I did experimented with it and not detect that moving up the crossover point was a benefit. However, when I did those experiments (2001-2002) I did not use yet use a Fundamental Channel. So, during that time I was merging the S2 driver with my upperbass horn’ upper knee, which had too heavy cone to care 2000Hz. The lower friqency S2 driver should be way more interesting contestant….

Presumably you discovered an effect that worth to imitate or at least to try. Do you have the vertical image shift slightly up when you change your crossover point higher? Anyhow, let see what will be your further finding or perhaps the final findings. However, there are few things that would strongly encourage you to check before make up your mind, all of them are related to the S2 driver in 400Hz horn

1) Make sure that your cone is properly center in a gap. It is very important as misaligned cone will do compression at bottom end

2) Make sure that the driver’s center are absolutely in the center of the horn and absolutely parallel to the horn’s axis.  That is also very important with MF driver. If the driver does not sit in a perfect optical center of the horn then it will have very sever anomalies, particularly when the horn is towed in or out. With the spherical, low throat horns, as we have, it is very simple to misalign the center of the driver for a few fractions of mm.
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
 Posted Date All replies in the thread
  5-23-06   Adding one more spherical to Macondo.   (5-23-06)..Romy the Cat
  5-25-06   A loss of axial symmetry   (5-25-06)..drdna
  5-25-06   GOTO: am I a hypocrite?   (5-25-06)..Romy the Cat
  5-25-06   The axial symmetry at 750Hz?   (5-25-06)..Romy the Cat
  5-25-06   Re: GOTO   (5-25-06)..slowmotion
  5-25-06   Back to the imaging of the fifth wheel.   (5-25-06)..Romy the Cat
  5-25-06   Re: Adding one more spherical to Macondo.   (5-25-06)..Wojtek
  5-25-06   The fundamentals channel: the first blood   (5-25-06)..Romy the Cat
  5-26-06   Stacking the horns: bad idea   (5-26-06)..Romy the Cat
  5-26-06   Some examples with Fundamentals Channel   (5-26-06)..Romy the Cat
  5-27-06   The S2 “fundamentals channel” – first success!   (5-27-06)..Romy the Cat
  5-30-06   Another example of use of a Fundamentals Channel.   (5-30-06)..Romy the Cat
  8-9-06   The “Fundamentals Channel” horns are here...   (8-9-06)..Romy the Cat
  8-11-06   "Pile O' Horns"   (8-11-06)..NBC
  8-11-06   Re: "Pile O' Horns"   (8-11-06)..Romy the Cat
  8-11-06   Horn mouth termination   (8-11-06)..NBC
  8-12-06   Bad "choked" mouth termination.   (8-12-06)..Romy the Cat
  8-12-06   Re: Adding one to Macondo: Beautifully wasted Saturday!   (8-12-06)..Romy the Cat
  8-13-06   New “fundamental channel”: juts pictures.   (8-13-06)..Romy the Cat
  8-14-06   The “Fundamental channel” - the first blood.   (8-14-06)..Romy the Cat
  8-14-06   Re: The “Fundamental channel” - potential mechanical HF filter   (8-14-06)..cv
  8-14-06   Re: The “Fundamental channel” - potential mechanical HF filter   (8-14-06)..NBC
  8-14-06   The new channel, phase plug and the objectives   (8-14-06)..Romy the Cat
  8-14-06   I love, I love, I love it!   (8-14-06)..Romy the Cat
  8-15-06   The new channel: first disappointment.   (8-15-06)..Romy the Cat
  8-18-06   More mysteries and THE Honk.   (8-18-06)..Romy the Cat
  8-18-06   Re: More mysteries - bizarre crossover effects   (8-18-06)..cv
  8-18-06   No mysteries in there but still the bizarre crossover effect...   (8-18-06)..Romy the Cat
  8-18-06   The new channel! Yes! I got it!!!   (8-18-06)..Romy the Cat
  8-20-06   Re: 2nd Order filter   (8-20-06)..guy sergeant
  8-20-06   Yes, in my case 2nd Order.   (8-20-06)..Romy the Cat
  8-20-06   The “fundamental channel”: the final tune.   (8-20-06)..Romy the Cat
  8-20-06   Re: Honk that Horn?   (8-20-06)..hagtech
  8-20-06   The ordinary honk of the bad horns owners.   (8-20-06)..Romy the Cat
  8-23-06   The “fundamental channel”: What a beauty!!!   (8-23-06)..Romy the Cat
  8-26-06   Some thoughts about my New Macondo's Absolute Tone   (8-26-06)..Romy the Cat
  8-27-06   Re: Some thoughts about my New Macondo   (8-27-06)..NBC
  7-28-07   "Absolute tone" - I was missing that Sound   (7-28-07)..Romy the Cat
  8-7-07   The Fundamentals Channel around S2 is taken further.   (8-7-07)..Romy the Cat
  8-10-07   Redesign the Vitavox S2 back chamber’s cover.   (8-10-07)..Romy the Cat
  8-10-07   Vent or Augment?   (8-10-07)..jessie.dazzle
  8-10-07   The chamber pressure leaking.   (8-10-07)..Romy the Cat
  8-10-07   A range of spacers?   (8-10-07)..Paul S
  8-10-07   A microscopic pneumatic valve? The field-coil… diaphragm damping?   (8-10-07)..Romy the Cat
  8-10-07   Control that leak!   (8-10-07)..jessie.dazzle
  8-10-07   control that leak! Part II   (8-10-07)..jessie.dazzle
  8-10-07   The leaked S2, one step forward & two back   (8-10-07)..Romy the Cat
  8-10-07   0 - 1 SCFM at 50 PSI?   (8-10-07)..Paul S
  8-11-07   Controlling my own leak!   (8-11-07)..jessie.dazzle
  8-11-07   The Bermuda Triangle rediscovered?   (8-11-07)..Romy the Cat
  8-12-07   Slowly rolling back…   (8-12-07)..Romy the Cat
  8-12-07   Back to Bermuda...   (8-12-07)..jessie.dazzle
  8-12-07   Who cares what Vitavox did?!   (8-12-07)..Romy the Cat
  8-12-07   297.875Hz ; The magic number?   (8-12-07)..jessie.dazzle
  8-12-07   The Vitavox S2 back chamber stuffing.   (8-12-07)..Romy the Cat
  9-27-07   Crossing in the middle   (9-27-07)..jessie.dazzle
  9-28-07   I migh be the phase "clicking"....   (9-28-07)..Romy the Cat
  9-28-07   Further observations   (9-28-07)..jessie.dazzle
  9-28-07   "I will try to take some measurements soon"...   (9-28-07)..Romy the Cat
  9-28-07   Correction & Vertical shift   (9-28-07)..jessie.dazzle
  9-28-07   Three mid channels crossovering - playing in the middle.   (9-28-07)..Romy the Cat
  1-13-08   The 6-ch Milq: Fundamentals vs. Injection Channels.   (1-13-08)..Romy the Cat
  6-10-08   How JBL is trying to do my “fundamentals channel”.   (6-10-08)..Romy the Cat
  6-20-08   250Hz tractrix upper range..?   (6-20-08)..NBC
  6-21-08   This is a universal crossover rule   (6-21-08)..Romy the Cat
  6-22-08   Specifically...   (6-22-08)..NBC
  10-28-08   The Fundamental Chanel gets a new driver.   (10-28-08)..Romy the Cat
  10-29-08   S2 : How low can you go ?   (10-29-08)..jessie.dazzle
  10-29-08   The low-path knee of Fundamentals Channel.   (10-29-08)..Romy the Cat
  10-29-08   Yep, I went for it. It is S3 now.   (10-29-08)..Romy the Cat
  10-30-08   Correction upon further inspection of the Black Hole   (10-30-08)..Romy the Cat
  10-30-08   Fundamental evolution   (10-30-08)..jessie.dazzle
  10-30-08   Channels, drivers design and some RTA rant.   (10-30-08)..Romy the Cat
  10-30-08   MF ramblings &&&   (10-30-08)..jessie.dazzle
  6-10-09   New options for Fundamentals channels.   (6-10-09)..Romy the Cat
  6-11-09   Efficiency?   (6-11-09)..Paul S
  6-28-09   The new life of the Fundamentals Channel.   (6-28-09)..Romy the Cat
  3-16-10   Macondo’s alternation of Fundamentals Channel.   (3-16-10)..Romy the Cat
  9-27-10   New Fundamental Channel.   (9-27-10)..Romy the Cat
  9-28-10   Option   (9-28-10)..Dominik
  9-28-10   Stereolab   (9-28-10)..el`Ol
  9-28-10   Revisiting the fundamentals   (9-28-10)..jessie.dazzle
  9-28-10   Macondo with wings and wide Fundamentals …   (9-28-10)..Romy the Cat
  9-28-10   Multicellular Horns   (9-28-10)..Dominik
  9-28-10   15 cell vs.18 cell   (9-28-10)..Romy the Cat
  9-28-10   Where to cross MF & theory on depiction of depth   (9-28-10)..jessie.dazzle
  9-28-10   The thoughts salad.   (9-28-10)..Romy the Cat
  9-28-10   Depth in stereo & the Flat Earth Society   (9-28-10)..jessie.dazzle
  12-13-10   Fundamental Channel, what a power!!!   (12-13-10)..Romy the Cat
  3-31-11   S3 as a low MF driver   (3-31-11)..gordan
  3-31-11   Depending on your amplification   (3-31-11)..Romy the Cat
  4-1-11   S3 and class A amps   (4-1-11)..gordan
  4-2-11   It is about magnet and SS type.   (4-2-11)..Romy the Cat

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