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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Jessie, screw jacks were exactly what I had in mind when I referred to "shores", up the thread (screw jacks may be used as a type of shoring).The beauty is just that they can be "tuned" incrementally, which is usually done to cut the most annoying re...
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These look like the absurdly expensive Yamamoto soundcraft teflon version, which I have used, and which do not work because the receptacles for the pins are shaped so that there is only a single point of contact when the pins go in. So the heaters pe...
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[quote user="jessie.dazzle"]Since renewing all tubes in both ML2s, over the period of about 3-5 minutes, the V2 bias on one of the amps cylcles between .27 and .33VDC. Is this behavior indicitive of a defective 6C33C?[/quote] That is not good. Try to...
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If it was not clear from my oblique comments before, I agree with what all have said, DAC1 seems to be techinically more correct but at the expense of some information loss. DAC2, which I prefer, has more distortions but also has more complete ...
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Jessie,I just managed to snag a used Wavelength Brick version 1 for a very good price. The Brick and Cosecant v2 use the same DAC section, unless you purchase a newer Cosecant v3 that is offered with an upgrade to a multi-bit 24/96 DAC chip. I listen...
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[quote user="jessie.dazzle"]Consider treating the problem at its root.Why not build a simple dedicated PC, running Server 2008 with a RAID array? I recently added a RAID 10 array (8TB, striped and mirrored), to an HP workstation... The result is fa...
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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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An interesting observation about the Velodyne SMS, thanks, Jessie.
There are a number of similar units out there. The Velodyne specification is very fine:
http://www.outlawaudio.com/products/SMS_manual.pdf
I did not use th...
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[quote user="jessie.dazzle"]I feel a driver needs to be somewhat hard-mounted to the enclosure. Cork gives the right sort of balance between hard-mounting and floating, while still sealing.[/quote]It's all about finding the balance point between the ...
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[quote user="jessie.dazzle"]A possibly dumb question here: When you and Paul give figures in milliamperes, where are you measuring the current (at what points), or are you extrapolating the figure? [/quote] The 6C33C current is measured in mA. The wa...
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It should be read: "...Alternately you might use hairy wood OR rough plaster surface as Jessie might do with his plaster horns..." Anyhow if you use textured paint then there is an easy was to increase size. When you spray the paint do not spay f...
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Jessie, I should say that the LF horn appears to me - a horn dropout - to be sort of the Philosopher's Stone of the True Horn Believers (THB). Unimaginable amounts of time and effort have gone into it, apparently with the most likely resul...
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[quote user="jessie.dazzle"] I do my best to remain ignorant of the price for which I sell off the hours of my life. (Btw, I'm not a software engineer; I design cars). Yes I could pay someone to do the work, but I'd rather put the cash toward the pur...
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[quote user="jessie.dazzle"] I'm not entirely satisfied that this single 40Hz horn was properly loading the room, which has a cubic volume not far from what I would consider ideal for such a system …. However, the horn was sitting in the center o...
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[quote user="Romy the Cat"]...There is also no infrastructure among the park of ready to use speakers that would be accommodated to use with DSETs...
The Cat[/quote]Yes, this is what I was trying to get at: what someone talented like Lamm might do ...
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Jessie, I can say without knowing anything about LF horns that those I have heard were indeed ineptly implemented. And I would die the Death of 1,000 Cuts before I said 1 word about my own pathetic efforts in that direction.Sorry, I though...
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Jessie, Unfortunately your images did not make and the most important dimension: the throat size is not visible. Will you go for 12” throat? Sometime I will do pretty much what you do, ironical using the very same drivers. I have a pair of AK154, a p...
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Jessie, if it is any encouragement you would have at least one client.Would it not be much less difficult and expensive to produce horn moulds if each horn was an assembly of identical sub-components? The idea is to segment the horn longitudinally in...
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[quote user="zanon"]My room is big … So how to measure it's size? Just write in floorplan of the entire house.[/quote]
I do not think that we need to measure room size but we need to understand the acoustic consequences of the room size and to...
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[quote user="jessie.dazzle"] Assuming one will not get anything under 50Hz (usable) from a 40Hz horn, I interpret the mission of lower-bass channels in the context of a horn system as follows….[/quote]
Hm, this is a bit tricky with bass. A pla...
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The horns are not really a "framed structure with plywood", but they should be a "Stressed Skin" construction. Glue up everything you can. The screws are just there to make the glue work better, and it's OK to leave them in. The idea here is to ...
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So if a third party is going to build it, presumably off-site, the necessary cycle of evaluation and testing will either have to be carried out by the third party, or else made impracticable by having to travel for each revolution. So you would still...
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[quote user="jessie.dazzle"]Having said that, I notice no difference when switching to battery when using a laptop model to run the external drive of my music server setup, but this is possibly because power may be routed "through" the battery even w...
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Jessie, this is a whole idea: do not get a signal into the ML2. It is NOT an operations sate but juts immediate testing. Do NOT short the ML2 input when preamp is connected to ML2 XLR inputs. By shorting the amp’s inputs you hear the inner-noise of t...
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I'm glad you had the opportunity to look into the G10. I find it to be a very intellectually satisfying material, which (to this sick mind) is important. G10 is a material that reminds a person of cleanliness, stability, perfect cons...
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[quote user="jessie.dazzle"] What am I saying? You might consider building a pair of "end of life" lower-bass channels now…[/quote] I would like to accent this point again. The "end of life" lower-bass channel in my view is not some kind of very well...
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[quote user="jessie.dazzle"]I just ran the calculations again and came up with a figure of 13.8 cu ft (for a QTC favoring transient response, not lowest F3). Then I measured the boxes and they do in fact come out to just under 14 cu ft, once wall thi...
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[quote user="jessie.dazzle"]About the blinds you have: Amazing; they inspire suicide![/quote]I actually do not hate my room with blinds all the way down as I hated it initially. The last couple days it is mean weather outside, probably the first gray...
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Jessie, congrats on the new *TEFLON* sockets. Did you do the cap shuffle, too, while you were at it? And what's this you say; you had to mill the sockets (or the chassis) to get them to fit? Tres droll!Now that your operating points are stable you...
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[quote user="jessie.dazzle"]I assume the above illustration is not indicative of the way you have the Tannoy Red aligned with regard to the other drivers, as it appears to be sitting out in front of them (?) [/quote]
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