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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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"May I ask you: what is your agenda to argue this subject?"To understand a phenomenon that lacks theoretical explonation, your working hypothesis or analogy about lens chromatism might satisfy and maybe even guide you the right way, but h...
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"To keep the horns parallel is about do not have those inconsistencies."I sugest that those inconsistencies ar due to on axis frequency anomalities of the used horns.Elimminate these, and the inconsistecies will vannish, and the concerned axiom wil b...
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I suspect that your negative views about on axis listening due to sensitivity to listening position must be to some narrow angle on axis frequency anomaly of the driver/horns you tried.If you insist to use chromatic aberration as a working hypnosis!!...
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Post #55:
Hi!
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by
be
on
2008-04-04
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"I do not
think that effect you describe has anything to do with demand of horns
have strictly parallel axis. I also came across to some situations
where the extremely indirect sound was superbly interesting but it is I
feel is very different sub...
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The most spacious sound I have heard was from a Lowther in a audiovector cabinet, here there is no direct sound at all since the driver fires straight upwards in a front horn for the mid/high and get reflected from the back wall and the ceiling.The L...
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Post #50:
???
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by
be
on
2008-04-03
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So the principle only works when listening in stereo?That sounds even more mysterious.I am not into imposing but maybe there is an explonation in what I said previously:"I think that Romys
preference for non tilting lies in, that by not tilting the ...
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Romy wrote:"Do not listen
Romy, make you own very simple experiment and then make your own mind.
Take two horn channels, low-pass and high-pas them at 6K for instance
and drive them with 6K sinewave. When you time alight the driver you
have well ...
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They have a 17cm throats so in most cases it is better to get the version with 2" throat for compression drivers, shorten them for the right throat size and build a chamber yourself....
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Hey Lowther boys!Anybody who heard these: http://cgi.ebay.de/Lowther-Reconing-Stamm-Membran_W0QQitemZ200209061041QQihZ010QQcategoryZ23323QQssPageNameZWDVWQQrdZ1QQcmdZViewItem...
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"Hm, I dont
really know about this, I heard a GOTO system with the GOTO 505 in the
GOTO 150 Hz horn and I found it to go anemic in the lower range, I
think a FANE M8, that I heard briefly during some experiments, would do
better in this range wit...
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Post #34:
Goto!
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by
be
on
2008-02-15
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I shold make it clearer:The Goto was used in a Goto 150Hz horn, crossed at 180Hz.I guess that is a proper implementation for Goto.The Fane was in a 140Hz tractrix horn with a 10cm throat and a not optimised (to large ) back chamber, and no crossover ...
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"I would be no surprised that in the case of proper use the GOTO-type approach and Fane-type approach would perform identically properly"Both the Fane and the Goto where used as compression drivers, so there where no principal differences of use."Do ...
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"another big selling
point to me was the 505 being a low resonance compression driver..
there just aren't many drivers with a resonance in the 80 to 100 Hz
range like this driver... I have just begun my playing, but am already
quite taken by it.....
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The best driver I have heard is the TAD 4003.
It does not use the secondary resonance of the suspension, as described by Duke LeJeune above for the TAD 4001-4002, to extend the response towards 20 kHz, but has a natural roll off from app. 15 kHz.
I...
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Sorry, I meant turn on the heater in position 3 in the start up
sequence and turn of the heater after reached position 3 in the turn
off sequence!...
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What about a 3 position switch?1. Direct connection between the anode and the B+2. Connection trough a suitable resistor for a gentle turn on/off.3. Completely disconnected.Just remember to turn on and off the heaters at the right times in the on-off...
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HI, Dietmar from Germany uses a diy multicellular horn for his JBL 077-tweeter http://chaudioroom.com/Photos/CH1505%20Dietmar-6m.jpg By the way, i´m searching construction plans of Altec 1505, 805 or 1005 for a complete DIY project. Any suggestions? ...
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I know they knew a lot in those days and could have dealt with the nonlinearity of air if they wished to or if there attention was drawn to it.Actually air is nonlinear with a uneven order nonlinear connection between pressure and volumen by audio fr...
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By distortion in the throat I mean distortion caused by the nonlinearitiy of air that manifest itself by high pressures.I dont think this was known in those days.If this makes any significant audible difference in this particullar case I dont know, b...
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It should be possible to find it hidden away in a technical universitys storage room if they have the AES papers. I could not find it on there website, probably they think it is obsolete.The distortion in a horn is generated by two mechanisms: 1. By ...
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By a second notion:A quarter of a round horn would probably be ideal, it would fitt in the junction between the wall and the floor, and maintain the round shapes double curved better resonance control when compared to the parallel single corved sufac...
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A tractrix and a exponential horn was compared in a AES paper sometime 1950-1970, I dont remember when exactly.
The two round and straight horns where made with the same theoretical cut off frequency, something like 100Hz, they had the same mo...
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"What is the most interesting is this selection of cobalt magnet that has less force then neodymium but more expensive."The ET-703 was probably designed when cobalt magnets where the most powerfull.RegardsErik...
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Thanks ml8, do you know how much it could swing before problems, either due to clipping or grid current?Rgds. be...
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ml8 wrote:"This few tubes was 6E5P, 6S45P (which i've found a little better for my single-stage amp that 6E5P) and... perfectly god-like sounding (output beam tetrode) 6P6S!!! Triode-connected, for sure. Absolutely the MOST clear sounding driver, and...
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They mention an intricate back chamber for the high frequency unit, maybe thats the primary function of the tube, apart from positioning the unit relative to the rest....
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Actually as far as I can see from the picture and trying to estimate the location of the drivers in the horns: The 3 front horns are probably time aligned, meaning the drivers are lying on an circle with the center at the hight of the listener and th...
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Hey!
Will you show some diagrams?
Could be interesting even if it turns out you dont like it.
20H/.5A amorphous? Who makes that?
Regards
be...
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The paradox of the orchestra sound would be resolved if we asume that the audience (in the good seats) mostly hear the reflected sound, primarily from the wall behind the stage and that the players at the front follow the visual lead of the conductor...
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