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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Had a wonderful visit with my Japanese friend. But now she's flying West over the Pacific, and I wanted to add my experience to the TH discussion.The main benefit of the TH is the relatively small mouth compared with a traditional horn. That's all....
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I had in my basement Marchand X26 crossover that I use over 10 years back. Since my B-2 power amp with passive filter is being fixed I setup the stock fixed B-2 with external Marchand active crossover. I spent some time to modify the Marchand X26 bi...
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Romy, perhaps your ScanSpeak arrays are a +/- natural fit for mid-bass? If you used them for that you might also push them down a little until you got your ULF solution. The "nice" thing about this is, you might use something relatively simple to d...
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There are lots of different types of "sand", including various sizes and shapes of the aggregates, not to mention the constituent materials, themselves. I thought that in most cases the idea of in-frame sand is to quench/diffuse "ringing", not ULF. O...
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Romy, is there any way you can re-arrange tor re-configure the speakers in order to accommodate the stacked 15" drivers, or are you determined to push your speakers against the wall where they are now? I ask because I have heard stacked 15" drivers ...
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Well, I do have 3 channels of DSEP. Dedicated Single Ended Pentode: one channel (bass/mid 30-500 Hz) with a 307A DH pentode feeding two wonderful Fane neodymium Colossus 12" - one from FS to 150 Hz and the second from FS to 500 Hz. OPT with a lot of ...
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[quote user="Romy the Cat"] I do not know if “stupid, indiscriminative mass loading is a road to nowhere”. [/quote]Let me try to explain why I think so. Adding mass (e.g. sand+shot loading of steel profiles):1) makes the vibration amplitude smaller f...
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Jessie makes an interesting point with the idea of trying to get ULF from 97 X 2" drivers. Very few small drivers are "optimized" to produce ULF in the first place, and so far the small-ish, BIG X-MAX drivers that are intended for "bass" have not be...
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After much listening and measuring I convinced myself that there is no way for me to escape the use of the 24dB per octave slope if I want to keep the sound of my midbass horn not violated. I also have to admit that I will not be able to render 4th ...
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After a lot of extremely pleasurable listening and reviewing own expectation for bass I went down with my bass level quite significantly. I rolled back the change in my bass amp gain and not I am at 5th click, which is about 12 dB down. So, not I am...
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It kind of said the Massachusetts is very much not “horny” state and there is not a lot of enthusiasts of horn loading live in Massachusetts or in the entire New England. If we New Englanders have the saturation of horn interest as high as California...
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Yes, the modified Crown DC
amps have been good candidates for ULF driving. They have the 1kW model that
was great if you need to burn some power and to introduce negative output
impedance to the ULF. It required a LF filtration however and the ULF...
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ULF is a consent not implementation.
I did experimented ULF based upon aura 18 in past and now I have the line-array
with 10” ScanSpeeks. The ULF is something that you should not be able to hear without
rest of the system. With my current ULF when...
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I have been lurking here for a while and am fascinated at the discussions of TONE. I play trumpet professionally in Germany and have many opportunities to experience big rooms and big pipe organs as well as symphony halls with various degrees of acou...
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Romy:Wrong? I am every now and then wrong, as most people are, and I am always grateful for any chance to gain a better understanding of anything that has my interest. But given how I now understand your position, I don't think there is a real di...
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I would like to suggest an alternative factor or explanation to your recent ULF/midbass findings.When you were chronicling the design and implementation of your midbass horns I was curious as to the effect of the very close placement of the two h...
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[quote user="Romy the Cat"]
My current bass is very “integrated” and very musical. It low, it is large, it is extended and it is in away grandeur and it has nothing close with faulty Hi-Fi impressiveness. It never take over sound and never indicat...
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[quote user="Romy the Cat"]Guys, I am not looking or care about the design specifics but rather looking for some fresh idea and inspirations that would make me to think further. You see, if I shut down Macondo and measure just ULF channels then I...
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Ok, I will share with you some ideas that I have in my head how to deal with horn decay asymmetry. They are in a way the further development of the Haralanov’s idea of acoustic diode – the brilliant concept from my point of view.
Before I will...
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My sub-bass amp is back but I am not sure if I am comfortable with it. The guy from QAudio did a wonderful job to fix my modified B-2 power amp and now I have my amp for ULF with passive line level filter in it. So, Now I have two identical, fully fu...
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I did not feel that it would be easy but I just found looks like a good configuration for ULF section. A second order 35Hz, yes, surprisingly second order. The key in this configuration is not to be selfish and to drive the ULF too hot. This might be...
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This si very interesting thread for me, just a couple of points more;I heard a bass driver can be cut under its resonant frequency, this will allow the driver to go much lower.Say a huge pro paper woofer with FS at 35 hz: we could use it as ULF chan...
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The frequency where your room turns into a pressure chamber changes the way that we perceive bass. This is how we get "bass" in a too small space like an automobile. When removing the ULF channel, all of the music is transmitted in a natural way for ...
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[quote user="decoud"] None of these seems to apply in your case because you have a properly levelled installation, directly on concrete [/quote]If I had it on a concrete I'd be very happy! On wood it is, mafrend, on wood.[quote user="decoud"]I see th...
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Romy, if the room supports it, why not put the lowest channel there?OTOH, if two big woofers are to fire at 180 degrees, is 3' far enough apart to preclude cancellation from rarefaction?Lots of ink has been spilled on the subject of ULF over the last...
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when talking ulf are we talking array of aura 18(the old ones not new junk), or something else...
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Nope, it is not my listening room but I it is a very nice looking listening room, I hope to post it here. The room has very nice dealing with first reflections, ceiling and many other aspects. I wish the right speaker were further from the wall. ...
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[quote user="Romy the Cat"][/quote]Ok, here are some thoughts that I have after the last night experiments. The tests were made with Sunfire subwoofer, wiath is bad sounding machine but excellent LF test source. The Sunfire slope wary from 3rd order...
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[quote user="jessie.dazzle"]You might find that you don't need that much power.When I first built the ULF channels I assumed they would require loads of power, so I bought a single, mono, 1KW class D amp to use in testing. Then I tried driving them w...
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[quote user="Romy the Cat"]Another this the I at this point has no idea why in my use
of ULF channels. I mean I do not use it as it does not sound right. This is strange
because it is VERY same ULD that I had before and that worked very well in my
...
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