In article ,
Harold and Susan Vordos wrote:
"DoN. Nichols" wrote in message
...
[ ... ]
[ ... passive radiator ... ]
[ ... ]
Hmm ... is there perhaps some kind of baffle to delay the sound
from the driven speaker to the passive one? But that would likely make
it peak at certain frequencies and cancel at others. (But maybe this
would happen at frequencies that those speaker elements were not fed,
being more the job of the midrange and tweeters.)
No---no baffles of any kind. I've had the woofers out of all of the
speakers to be reconed. They have a foam rim that eventually deteriorates
and must be replaced. Heavy passages can actually tear them apart
completely, although mine have never gone that far.
I've seen that happen. A problem with pretty much *any* foam
rubber over time, and a foam rim does give significantly better
compliance than the tar-soaked paper or cloth ones with multiple pleats.
[ ... ]
California to Utah. Needless to say, that all went away when the high
end home speakers were abandoned. I'm not convinced JBL sells anything
today that's noteworthy.
I strongly suspect that you are correct in that.
Mid range is in the center, with the tweeters mounted on the appropriate
top end, right for right, left for left. It's interesting to watch the
woofer work with heavy passages. It's obvious the difference the
passive
radiator makes by the throw one sees.
[ ... ]
Great! I presume that there is no grill cloth mounted in front
of those elements.
There is a very light weight black cloth that is stretched tight and stapled
appropriately. Doesn't seem to create any strange noises, and performs a
fairly important function of masking what's behind the wooden grills. I
think they spent enough time with the design to insure it was a good one,
but I have no way of knowing if it is, or not.
O.K. My comment was because of your mention of watching the
woofer work with heavy passages.
[ ... ]
but with my high
end hearing slowly deteriorating, I noticed I was missing some of the highs.
My high end has been terrible since at least mid high-school,
when my hearing was first tested.
One cut in particular, a Jacques Loussier recording, I often completely lost
the sound on a soft drum solo where there was considerable cymbal work.
I pretty much don't hear much of that.
Susan could hear it, however. The speakers were used in that fashion by
need, stacked one on top of the other in a small room.
I understand the problems with a small room.
There is another interesting speaker which a friend and neighbor
has. The speakers are capacitive drivers -- big flat things just a bit
smaller than a door. Very nice sound from those, but very expensive
when new. He got both sets used at different times.
I wonder---would that be a planer type speaker?
Yes.
I think that should be a plan*a*r speaker, but I appreciate that you
understood my comment.
I didn't pay any attention to the spelling -- I did know what
you meant.
[ ... ]
seem to recall he was using a Carter amp,
"Carter" or "Carver"? IIRC, the Carver does some strange
processing to try to "improve" the sound. While my Halfer is plain and
straightforward -- pretty much DC from just past the input coupling
capacitor to the speakers. That coupling capacitor was to keep DC from
whatever preamp you used from biasing the speaker cones away from the
central at-rest position.
Blush! Yep, I think it was Carver. I recall that he was interested in
Mc gear, but couldn't come to terms with the cost. He often offered to
store mine for me while we were building the castle. g
The Carver design seemed to me to be too much "snake oil", while
the Hafler design was plain and straightforward, trading a little extra
power dissipation (running in Class-A push-pull to eliminate crossover
distortion) to get the better sound quality.
[ ... ]
She even searches eBay for tools for me -- and has not yet
learned to not say "this one sounds strange" and attract my attention. :-)
How cool is that? Susan has no clue about tools, but she sure encourages
me.
Dolores has no idea how to *use* them -- but she is good at
recognizing them. She finally found a cut-style knurler which did not
go sky high (compared to new price), and which fits my tool holders, so
I can start to experience that capability. (Well ... I do already have
one in the form of a long-armed 3-jaw chuck which works on the turret,
but that has a limited travel.
[ ... burning CDs of your (irreplaceable) vinyl recordings ... ]
Not so -- though that is one way to do it. There are small
boxes available which can be connected to your system (typically the
"recorder" output from the preamp, so your adjusting of the volume for
listening won't affect the recording level -- even if you have to turn
the volume all the way down to answer a phone call). It sits there and
captures the audio. You then may wish to interact with the box a
little, to set index points so you can skip to a given cut -- that may
do well on automatic, or you may wish to adjust it. Certainly the
automatic indexing does not work well in a live concert with the
performer talking and introducing the song and telling where it is from.
Thanks for the information. My limited exposure to anything electronics is
really taking a toll on me. The nearest hi fi shop is at least 100 miles
away, so I'll have to do some serious inquiring when it comes time to make
decisions. It's nice to know there's people out there that keep informed.
I'll likely call on you for advice when I get near, DoN.
O.K. By then I might have actually gotten around to picking up
one for my own use. I'm not sure how easy they are to find. I'll be
getting mine through a local professional audio vendor.
[ ... ]
I wonder. Does the Studer name come connected to precision machine
tools?
It may well be. The machining of the drive is beautifully done.
[ ... ]
Especially in these ones. IIRC, the Studer in question is
Swiss.
As are the grinders as far as I know. I've not operated one, but have seen
one. They are reputed to be able to work to .000010" (according to the
shop people at Litton Guidance, where I saw the machine in use), a far
smaller figure than the B&S # 1 universal machines I used to operate. We
routinely held .000050", but anything closer was pretty much hit and miss.
I gathered from the comments at Litton that they were a superb machine.
Very likely connected, then. Among other things, there is the
lapping of the record/playback/erase heads, which is likely to be done
by some of their own tools.
Enjoy,
DoN.
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