Okay, I've just seen your measurements, thanks for that - I missed that bit of info with the timing of the diyAudio server updates.
The figures look about right for that technology - which means the amp has to pump out very considerable voltage swings without audibly stressing, 90dB max is roughly right for the max swing at the moment. Since the impedance is 1 ohm, the amp, and PS, are having to work under the worst possible conditions, at normal listening levels.
Chip amps, in parallel could do it, with the right supplies - but I will pursue this little design exercise in the meantime: 62 or so V swings, meaning the same current numbers into 1 ohm, or 45A RMS. Trick is to get the output stage to do this while working cleanly, no nasty glitching happening anywhere ...
The figures look about right for that technology - which means the amp has to pump out very considerable voltage swings without audibly stressing, 90dB max is roughly right for the max swing at the moment. Since the impedance is 1 ohm, the amp, and PS, are having to work under the worst possible conditions, at normal listening levels.
Chip amps, in parallel could do it, with the right supplies - but I will pursue this little design exercise in the meantime: 62 or so V swings, meaning the same current numbers into 1 ohm, or 45A RMS. Trick is to get the output stage to do this while working cleanly, no nasty glitching happening anywhere ...
Yes it need's power , but much less than the sensitivity numbers tell @5M, it is 9 db lower than your typical 90db/m/2.83 volt point source speakers , then being dipole and a linesource, produces a larger projection of sound, and with more clarity, doing so it does loud differently, so dont be fooled by the numbers..
Yes, the dropoff is about 3dB, vs. 6dB, with doubling of distance. What panels have on their side is that the suspension doesn't need to be conditioned as compared to dynamic speakers, they should be at optimum quality almost immediately from cold. Cone drivers need to be hammered for an hour or so, for that panel 'clarity' to emerge, IME at least ...
A question for both Wayne and Frank: how big are your rooms, W x H x D?
Approximately will be just fine.
I seem to remember that Wayne mentioned 87 dB/2.83V/1m some time ago, expressed as a classic sensitivity figure, but I could be wrong, as I write I'm drinking some really black coffee (cowboy stuff, you know, when you throw in a horse shoe, it floats).
Approximately will be just fine.
I seem to remember that Wayne mentioned 87 dB/2.83V/1m some time ago, expressed as a classic sensitivity figure, but I could be wrong, as I write I'm drinking some really black coffee (cowboy stuff, you know, when you throw in a horse shoe, it floats).
A question for Pierre: what is the general perception on France of Cabasse speakers?
I know they have been called "The French JBL", but quite aside from such silly generalizations, I have heard a few of their speakers and I must say, I just LOVED them. Quite simply, they sounded alive to me, full of life.
I know they have been called "The French JBL", but quite aside from such silly generalizations, I have heard a few of their speakers and I must say, I just LOVED them. Quite simply, they sounded alive to me, full of life.
I cannot comment on that Russ, as I haven't heard the 5xx line yet.
However, since this saying originates way back into the late 70ies, I think this referred more to the JBLs of those days, the 4310 and 4312 being the point, I believe. One of ths Cabasse models also used a 12" bass, a separate mid and treble, so I think this was aimed squarely at those JBLs.
Generally, it's difficult to talk about speakers because the USA and Canadian part of the forum usuall has no idea what I'm talking about, while the European part usually does.
For example, a few days ago I was with some friends evaluating two models of a German manufacturer KS (Kuecke & Sohn). Both were 3 way designs from the mid 80ies, the smaller one using an 8" bass, a cone mid and a titanium dome tweeter, the larger unit using a 12" bass, and dome mid and treble. The smaller model is an almost perfect example of a studio monitor, being very well balanced and delivering a wide stage with some depth. The larger monitor had more gravitas, had more body to the bass, which was very clean and unusually well controlled, and, fortunately, the rest of it was also very well integrated. On balance, I'd probably go for the bigger model in my room. It lagged behind my standard refernce JBL 4312 in that it didn't quite match the JBL for the sheer joy of living, it lacked that last bit of sparkle which the JBL does oh so well.
To me, with a reasonable access to speakers from Germany, France and Italy, this is a serious constraint.
5 x 3 x 8 roughly - the back wall is angled at about 30 degs. I don't take any notice of, or have any interest in this room influence thing, I've been in too many rooms of all sorts, where the sound quality has nothing to do with the room, it's all about how 'dirty' it is at the driver surfaces.
It will influence the sound, but IME, in the areas that matter to me, it has zero value, either way. A good real pianist, on a good real piano, in the "crappiest" room possible, will be sending a musical vibe out that completely overrides what the room is about ...
That's where I'm coming from ...
That's where I'm coming from ...
Are you talking live or reproduced, have you ever heard or recorded a grand in a room your size. Believe me you dont have enuff speakers to replay that .... 😱
The room has a big influence on sound, well ,not on a small projecting speaker like yours listening in the near field ...
The room has a big influence on sound, well ,not on a small projecting speaker like yours listening in the near field ...
And that's where you're dead wrong ... the intensity, the sheer overwhelming 'volume' of sound a piano produces when the pianist is going for it is not a problem for audio in a theoretical sense - practically, most amplifiers go limp at the knees when asked the question, they can't deliver - as a counter example, this is where the Bryston, for example, had the right engineering ...
Near field? Well, if I want my ears to start ringing after 5 minutes this might be a good idea ...
Near field? Well, if I want my ears to start ringing after 5 minutes this might be a good idea ...
Frank and Wayne, do you guys share pictures of your audio room and audio rig between yourselves?
You know...just to add another perspective to your expertise and scientific/technical audio talk exchanges.
And by the same token, us, the other readers and contributors (dvv included, of course) could also benefit perhaps? 🙂
You know...just to add another perspective to your expertise and scientific/technical audio talk exchanges.
And by the same token, us, the other readers and contributors (dvv included, of course) could also benefit perhaps? 🙂
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