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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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"This topology was invented by Steen Duelund"Ah-hm, ring radiators where not invented or even re-invented by the Steen Duelund dude, just copied. JBL used the priciple 40 years prior to that in: 2402-2403-2404-2405 and Fostex have been using them al...
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Hello i was told by the shop that sold me my pp2000 that the unit was not designed for battery back up in normal operation. That battery back up was added only for cases of power lost. Ive had that happen only once in the time ive used the unit. Now ...
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[quote]Just to clear this up, simply because you have not had an issue, does not mean that an issue does not exist, and that this must be a defective unit.[/quote]I was responding to the comment about the person being bothered by anything in the uppe...
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I ran quite a few types of gear with the 2000 I tested. It was quiet as a mouse with all of them. I also have extremely good high frequency hearing and if there's anything "unnatural" going on in that range it would bother me greatly. The buzzing...
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Hi.
1) He was very certain that it was not a result of a softening of the suspension or the speech coil for that matter.2) Probably it it is more significant to look at the harmonic structure and decay of the vibrational spectrum of the magn...
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I just spoke with a guy who have made both permanent magnets and electro magnets for loudspeakers.He said that the reason that electro magnetic speakers have a smoother and more grain free sound, is due to the temperature rise in the mechanical parts...
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Cat wrote:"It has the
same ability to super precise to follow the very minute dynamic
fluctuation of signal and superb transient but those phenomenal
qualities are not connected with anything else, primary it has no
correct harmonic bac...
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drdha,Is your hum comming directly from the purepower unit itself?I've been doing some research on hum issues in general; a goood site for information is linked here [url]http://www.epanorama.net/documents/groundloop/home_solving.html[/url]Previously...
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Hey. I have not seen it mentionned here, have you tried, or even considered regulated dc-current supplies for the heaters?Should have the sound quality of ac-voltage supplies combined with the lack of noise of the dc-voltage supplies.??http://www.ten...
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[quote]
Actually, Beav, there is something different in your case. I think what you do it wrong. If you are a reviewer and you are in possess of writing a review about the PP2000 then I would advise you do not search online what others say but subj...
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What I have is a subwoofer made by ACI; no information on the amplifier used other than it uses a two prong power cord, no ground. When I hooked it up to the APS 2000 I got a very loud pitched hum. Taking if off the 2000 and plugging it into a...
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Hello all i must have missed the subject line with pp2000 noise i have not noticed any hiss at all from all inputs except my phono amp. Whats the problem and fix?ThanksMike...
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Well got my very hefty piece APS PP 2000 today. This item is well packaged and weighs in at over 70 lps. You could pull something if your not careful positioning 2000 in your rack. Glad i have my Audiav Crystal rack for this behometh. My loaned 1050 ...
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On initial installation of my borrowed 1050 i used power cords i have as extras. Did so cause i was still using my BPT for everything but my amps. I had a hum and high pitch buzz from my speakers. Replacing the power cord feeding my amps was the cure...
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By far the addition of this device has made serious improvement to what my ears are hearing. I know there a lot of technical reasons for good or bad power values in the area of power line gear for our stereo systems. In my case i'm letting my ears de...
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Adrian i have been dropping in on occasion to Romys site due to its down to earth style. Being a common blue collar workerbe i can appreciate a good down to earth explanation. I came back today after doing a google of APS 2000. I may have been misund...
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Hello Romy a long time visitor now a member. I have always been interested in what improvements can be made to my incoming power. I use a BPT 2, PS noise harvesters and quite lines through out the house. My system has always had very good sound...
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Hi!Could you tell a bit about how does this:"I end up with 360V on B+, 15K plate load, grounded cathode, 160V on plate and -3.5V on grid via a series battery."sound as compared to the normal Milq bias?Thanksbe...
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To understand why permendur, as reported elsewhere and to my own little experience, sounds different to soft iron as conductor of magnetism in loudspeaker motors one must look at permendurs properties.
Two differences might contrib...
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Normal
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Post #82:
Seal
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by
be
on
2008-07-16
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"Did you understand that this was the case?"Yes."Though I have not detected any "flaccidity""I am not shure if will be any difference, but I would find it worth a try..be...
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Very nice project you have, an inspiring effort!Loking at the pictures it seems to me that you are using felt in front of the chamber front plate to seal the coupling between the horn and the chamber?This could cause some problems if the felt sheat i...
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Very interesting "review" thanks.The 150D is possibly not the most relevant comparison, it does not seem to be a high quality product since its ESR values are not even mentionned in the data sheets.Tha T97 series: ( http://www.vishay.com/docs/40092/t...
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Gregm, you wrote: "Yet, the best result -- i.e. most homogeneous sonically -- came from the thinner wires in interconnects."Did you use silver wire for your comparison?...
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I recognise your observations about the Ag vs. Cu sound, but instead of mixing the two materials I think it is better to change the diameter.I experienced 0.5 mm silver wire to be too thin soundvice, have you tried 1.0 mm or even more? The thiner the...
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"TAD TD-2002 seems to have that "interesting" tone"The TAD TD-2002 has an interesting frequency responce, it goes as a technically perfect driver should up to app, 15Khz then there is an unusually softly rounded peak around 20kHz with an amplit...
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The Enable patterns are efficient on a loudspeaker membrane because there is a strong structural coupling of the transversal sound waves in the membrane it self and the additional mass and damping of the spots.In this case the situation is different,...
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"I think the
edge termination is less of an issue if the horn is operated above
cutoff, but in the case of your midbass horns, with the floor coupling,
things should be more interesting."There would be no effect at all, of the arangement in the pi...
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Hi!
I just thought of something that could have some relation to this topic:
Take a horn with a driver, the driver produces a signal, the pressure wave will travel outwards more or less like a spherical wave front along the axis of the horn, think ...
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Thanks Paul and Romy, quite exciting to get into this isue.I will make my experiments and get my own impressions and try to figure it out.Regards Be...
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