This is a good question. Maybe David can weigh in on this. We know David does not care for active isolation under the turntable.
Ron's Speaker, Turntable, Power and Room Treatment Upgrades
- Thread starter Ron Resnick
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This is a good question. Maybe David can weigh in on this. We know David does not care for active isolation under the turntable.
Steve williams
Site Founder, Site Owner, Administrator
It seems to me that the tolerances are tiny with that massive platter supported on a super thin layer of air at only 3-4lbs of pressure. I wonder if even the slightest movement would cause a ripple in that thin film of air. Standing on one of these active platforms is a very interesting question, but I don't know if they could support 180 lbs. Has anyone tried placing a very large bowl of water on an active platform and then tapping the platform to see the reaction. The top surface is supposed to suppress or respond to vibrations and react extremely quickly so as to not be detectible.
I also wonder if there is a gyroscopic effect with this massive AS platter spinning and in effect creating its own stability which might counteract vibrations from above or below.
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Micro has not lived with Herzan's for 5 years. piezo electric sensors and actuators are very fast. fast enough. and very stiff too.
and there are no sure things in life, and all I said was I would bet on it. he would not. time will tell. Christian will have his AS-2000 plus NDW-23A active table in a month or two and we will see how it goes.
Steve williams
Site Founder, Site Owner, Administrator
Mike or Christian
Out of curiosity can the Herzan be turned off such that you’ll be able to compare the sound both ways.
Out of curiosity can the Herzan be turned off such that you’ll be able to compare the sound both ways.
yes and no. there is always a passive component to the active Herzan products, which remains. it's not like a solid table top; there is a bit of damping going on. but the active portion can be turned off and on.
many times for me, I've forgot to engage the active portion (of my TS-150 or TS-140) as the turn on is a 2 step affair (stage 1 = leveling, pause as it levels, then.....press the button and stage 2 = active). and about 30 seconds in I can tell there is something missing and go over and sure enough, the active is not engaged. yet I think the Herzan shelf in all-the-way off position is a darn good passive shelf.
for the AVI (as opposed to the TS units Christian and I have already) there is no leveling stage (they have a manual one time leveling process once the gear is in place on the platform), so they are either on or off. but again; off still retains an inherent passive component.
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I have been having problem getting the armboard for the Axiom. Techdas sent me the second armboard that can be used with the Axiom, BUT I couldnt swing it without hitting the SAT on the right. I dont know if they would make me a custom armboard specifically for my purpose. Sometime it is just not so easy to ask the supplier to customize thing for you. My back up plan is to fabricate my own armboard. If there is a will, there has to be a way
.Kind regards,
Tang
Ditto. My same experience. I forget to engage active after cold startup, start listening and notice something is wrong after a minute or two....rather not sounding as good.
I have been having problem getting the armboard for the Axiom. Techdas sent me the second armboard that can be used with the Axiom, BUT I couldnt swing it without hitting the SAT on the right. I dont know if they would make me a custom armboard specifically for my purpose. Sometime it is just not so easy to ask the supplier to customize thing for you. My back up plan is to fabricate my own armboard. If there is a will, there has to be a way
Kind regards,
Tang
Just swap the tonearms and mounts so the 12 inch axiom is on the right.
Do you know what is the resonance frequency of the loaded passive component without active correction?
Rockitman, posting on his "I said I would never buy another Turntable...Argh !!!" thread, wrote:
"stand placement logistics is an art managing where components and TT's reside in/on racks and having the right length's for interconnect to reach said components without having to pay the wire whores their exorbitant prices for the "best" cabling in longer lengths than you already have . . ."
He raises a very good question!
I am planning to have three identical racks, the only difference being the middle rack will have a wider and deeper tabletop.
The left rack initially will be unused. In the future I anticipate a United Home Audio Ultima 2 on top and the related outboard power supply on the bottom shelf. The middle rack will have the American Sound turntable on top and the motor drive controller on the shelf. The right rack will have the Io control unit on top, and a power supply on each shelf.
The Io is closest to the wall conduit through which the interconnects will pass into the listening room.
"stand placement logistics is an art managing where components and TT's reside in/on racks and having the right length's for interconnect to reach said components without having to pay the wire whores their exorbitant prices for the "best" cabling in longer lengths than you already have . . ."
He raises a very good question!
I am planning to have three identical racks, the only difference being the middle rack will have a wider and deeper tabletop.
The left rack initially will be unused. In the future I anticipate a United Home Audio Ultima 2 on top and the related outboard power supply on the bottom shelf. The middle rack will have the American Sound turntable on top and the motor drive controller on the shelf. The right rack will have the Io control unit on top, and a power supply on each shelf.
The Io is closest to the wall conduit through which the interconnects will pass into the listening room.
Sorry, but no. I ordered from Acoustic Sounds last night several more LPs of some of my favorite 1980s rock and pop stuff. No CDs needed here!
The "room" is a dedicated space but not really a dedicated room. One-half of the left side of the space (towards the rear wall) is open to the kitchen, and one-third of the right side of the space (towards the rear wall) is open to the equipment room. Finally, an asymmetrical ceiling soffit steps down above the left rear side of the room.
The walls of the room are what they are (some concrete and some drywall) so I do not conceive of the project as "designing" the room in the sense of building a "room within a room" or ceiling resonators or bass traps or other structural audiophile improvements. I am not do anything structurally to the walls of the room. It is just a matter of fixing drywall and painting the walls. This is in no way a purpose-built room like MikeL or Marty designed.
I had a fully-functioning stereo (also with dipole speakers) in this room with only some carpet and some ASC Tube Traps and Tower Slims, and I was happy with the sound. I think 14 foot ceilings help a lot.
Steve's and Bob Vin's acoustician, Bonnie Schnitta, will be measuring and making recommendations. Acoustically necessary or not I would like a movable drapes arrangement on the side walls and the rear wall to create the contour of a rectangle to delineate visually the four "walls" of a room.
I also still have the ASC Tube Traps and Tower Slims to play with over time.
I'm reasonably confident that with Bonnie's assistance we can realize at least three-quarters or so of the potential of the 19.5' wide, 24.5' long and 14' high space. To realize the rest of the potential of the room and to maximize sound quality I will look forward to analyses and suggestions from our members here who visit me. (David and Marty and MikeL, among others, have the patience to move the speakers an 1/8" and then reassess carefully the sound. I do not naturally have that kind of patience. Hint, hint )
There is one line of thought that even suggests that large openings in a listening room can be helpful in releasing excess bass pressure.
The walls of the room are what they are (some concrete and some drywall) so I do not conceive of the project as "designing" the room in the sense of building a "room within a room" or ceiling resonators or bass traps or other structural audiophile improvements. I am not do anything structurally to the walls of the room. It is just a matter of fixing drywall and painting the walls. This is in no way a purpose-built room like MikeL or Marty designed.
I had a fully-functioning stereo (also with dipole speakers) in this room with only some carpet and some ASC Tube Traps and Tower Slims, and I was happy with the sound. I think 14 foot ceilings help a lot.
Steve's and Bob Vin's acoustician, Bonnie Schnitta, will be measuring and making recommendations. Acoustically necessary or not I would like a movable drapes arrangement on the side walls and the rear wall to create the contour of a rectangle to delineate visually the four "walls" of a room.
I also still have the ASC Tube Traps and Tower Slims to play with over time.
I'm reasonably confident that with Bonnie's assistance we can realize at least three-quarters or so of the potential of the 19.5' wide, 24.5' long and 14' high space. To realize the rest of the potential of the room and to maximize sound quality I will look forward to analyses and suggestions from our members here who visit me. (David and Marty and MikeL, among others, have the patience to move the speakers an 1/8" and then reassess carefully the sound. I do not naturally have that kind of patience. Hint, hint )
There is one line of thought that even suggests that large openings in a listening room can be helpful in releasing excess bass pressure.
microstrip asks: "What are the materials used in the Pendragon ribbon? What are its dimensions?"
It is a two meter long Bohlender Graebener ribbon, I believe, mounted in a steel support structure.
It is a two meter long Bohlender Graebener ribbon, I believe, mounted in a steel support structure.
I was not aware, I wrongly though it was a pure ribbon. As far as I remember Genesis also used this ribbon in one of the versions of the Genesis 200's - it is a polyester film with aluminum conductors. It was very popular at some time and they now reach high prices at auctions, as the long version it is not easily available any more to the DIY people.
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