Further Vibration Abatement For The Cary Audio CD 306 Pro Version SACD Player

DarqueKnightDarqueKnight Posts: 6,629
edited October 2013 in Electronics
Introduction

Since I already had my Dynamat Xtreme and tools out (after applying Dynamat to my power amps), I thought it was a good time to stick a little of the old "black magic" into my Cary Audio CD 306 Professional Version SACD player in order to deal with internal vibrations caused by the transport. I had already implemented an effective regimen against external vibrations as shown in figure 1.

Cary Audio did pay due regard to vibration abatement. The chassis is a thick aluminum box with copper bar bracing and thick aluminum cone feet. A thick aluminum plate covers the transport assembly and the disc tray is a single piece of machined aluminum. All circuit boards are braced well-supported to diminish vibration. However, Cary got it all wrong with the placement of the cone feet. Rather than a foot at each corner, there should have been a foot under the transport motor, another foot under the power supply, and a third foot in the rear opposite the foot under power supply. Cary's oversight actually worked out for the best. The Black Diamond Racing carbon fiber cone/pit system is a better solution than aluminum cones and I did not have the issue of permanently attached cone housings being in the way of the optimum placement locations.

CD306-PBase-BDR-Comp-s_zpsa5899a8d.jpg
Figure 1. Cary CD 306 Pro Version SACD player resting on Black Diamond Racing Mark 4 cones and Jumbo
Pits, and a PS Audio PowerBase isolation platform with power line filtration.


Installation Procedure

Dynamat was applied to the transport cover, which is a thick 7/16" slab of aluminum, with an additional 1" thick aluminum bar over the disc spindle. The transport cover was fairly resistant to ringing, only producing a dull truncated ring when tapped. After Dynamat was applied, the transport cover produced a dull "thump" sound similar to that of a thick hardcover book when tapped with a finger.

Dynamat was also applied to the sides and rear of the plastic transport housing, the plastic crossbar which houses the spindle cap, and the sides of the copper walls on either side of the transport..

CD306PVDynamatCrossbar-s_zpse9b8126c.jpg
Figure 2. Tight space! The disc tray is aluminum, but the transport housing is all plastic. There was only
1/4" clearance between the sides of the transport and the copper walls. I used a tool to assist in applying
Dynamat in those narrow spaces.


WirePryTool-s_zpsc0a27ec7.jpg
Figure 3. This thingamajig, which was made from a wire clothes hanger to assist in pulling drivers from a
speaker cabinet, has proven useful in lifting off the snug-fitting covers of my X600.5 power amps and in
spreading strips of Dynamat in tight places.


CD306PVDynamatSide-s_zps906417c1.jpg
Figure 4. Dynamat was applied to the opposite sides of the copper walls adjacent to the transport.

CD306PVDynamatTrnsptHouseOut-s_zps84214c61.jpg
Figure 5. The transport cover draped in Dynamat.

CD306PVDynamatTrnsptHouseIn-s_zps1f1f424d.jpg
Figure 6. Dynamated transport cover installed.

I received my first bit of sonic satisfaction before the first post-installation disc was played. The disc drawer made a solid sounding "clunk" sound when it closed. Before, it closed with a metallic "clack". I would have put Dynamat under the disc tray had there been room.

Test Procedure

Measurements of a 50 Hz square wave were taken at the right channel XLR output with an oscilloscope before and after Dynamat application. A 4 foot length Signal Cable Silver Resolution XLR interconnect was inserted into CD306's the right output. The oscilloscope's probe was attached to the signal and ground pins of the interconnect with alligator clips. I would have preferred to attach the probe directly to the player's output pins, but I would have had to move the player out of its normal position to easily access the rear panel, and I did not want to do that.

Measurements were taken prior to the listening evaluation, but the results were not reviewed and analyzed until after the listening evaluation.

Test Apparatus:

1. Tektronix TDS 2013 Digital Oscilloscope.
2. Signal Cable Silver Resolution XLR interconnect, 4 foot length.
3. Autosound 2000 Test Disc #101, Track 8, 50 Hz square wave test signal.

TestSetupComp-s_zps61143777.jpg
Figure 7. Test signal measurement setup.

Figures 8-15 show the pre and post Dynamat test signal measurements. The damping effect of the Dynamat resulted in an overall cleaner signal with less overshoot and 3% faster response time.

001BeforeDynTrain-s_zpse07f443b.jpg
Figure 8. Square wave pulse train pre-Dynamat.

005AfterDynTrain-s_zps690c2881.jpg
Figure 9. Square wave pulse train post-Dynamat.

003BeforeDynRise-s_zpsb39842a8.jpg
Figure 10. Square wave pulse rising edge pre-Dynamat.

007AfterDynRise-s_zps44ac9d3d.jpg
Figure 11. Square wave pulse rising edge post-Dynamat.

004BeforeDynFall-s_zpsd4efe79b.jpg
Figure 12. Square wave pulse falling edge pre-Dynamat.

008AfterDynFall-s_zps2aa40f77.jpg
Figure 13. Square wave pulse falling edge post-Dynamat.

Listening Evaluation

Listening evaluations were done with familiar, high quality recordings. Aerial and lateral spatial maps were made of stereophonic sound images and the descriptive attributes of those sound images were documented. Those notes and maps were compared to notes and maps of the same recordings taken during previous listening sessions.

Even without comparing notes, the increase in midrange and high frequency detail was immediately apparent. I could hear more of a singer's articulations and some percussion sounds that I thought were new, turned out to be louder and more clearly defined when compared to past notes. There was a small increase in depth on some recordings, as if the drum set had been moved 1 or 2 feet back. On Dave Brubeck's "Take Five", his piano seemed to be turned toward me about 30 degrees more than previous.

There was more tactile sensation and image weight, but I was very disappointed that bass detail, bass speed and bass articulation was noticeably diminished. I did not know if this was something permanent or if it was a matter of the player needing to "re-settle" or "re-break in". The late D. J. Kasser informed me that components usually need to re-settle or break in all over again once their mechanical vibration environment is changed. I was prepared to wait a couple of days to see if the bass improved, otherwise, the Dynamat was coming off. The bass aberrations went away after 5 hours of play time and bass performance was improved over the non-Dynamat performance after 10 hours of play time.
"So hot it burns Mice!"~DK
"Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
"Knowledge, without understanding, is a path to failure."~DK
"Those who irrationally rail against something or someone that is no threat to them, actually desire (or desire to be like) the thing or person they are railing against."~DK
Post edited by DarqueKnight on

Comments

  • DarqueKnightDarqueKnight Posts: 6,629
    edited October 2013
    Further Vibration Abatement

    After achieving good results by treating the CD306PV's transport, I went ahead and treated all the other accessible surfaces. This included a small portion of the top panel, both side panels, portions of the rear panel and portions of the copper interior walls. Some places, like portions of the top panel, could not be treated because the Dynamat would have been in direct contact with components on the circuit board beneath. Application in other places would have blocked access to screws or made it difficult to remove circuit boards or other components.

    CD306PVDynTopPanel-s_zps675db8b7.jpg
    Figure 14. The top panel is a 3/16" slab of anodized aluminum with good resonance properties. The
    untreated panel faintly ringed when tapped with a finger.


    CD306PVDynSidePanel-s_zpsb5a5a082.jpg
    Figure 15. Each side panel was treated with a 3" x 12" Dynamat strip.

    CD306PVDynRearPanel-s_zps2c1e0e53.jpg
    Figure 16. Dynamat was applied to the rear panel as space allowed.

    Second Round Of Measurements And Listening Evaluation

    Measurements showed a further reduction in distortion in the test signal waveform after additional Dynamat was installed. After the second round of Dynamat installation, I heard and felt more image weight and heard new details in some recordings. I again heard a blurring of bass transient performance, but that went away after two hours of play time.

    If you save the plots of the test signal pulse train and view them in succession (figures 8, 9, and 17), the reduction in waveform distortion is quite significant as you go from no Dynamat, to Dynamat only in the transport area, to additional Dynamat.

    009After2DynTrain-s_zpsec6fa4f0.jpg
    Figure 17. Square wave pulse train after additional Dynamat installation.

    011After2DynRise-s_zps19b472e0.jpg
    Figure 18. Square wave pulse rising edge after additional Dynamat.

    012After2DynFall-s_zps82bd923b.jpg
    Figure 19. Square wave pulse falling edge after additional Dynamat.

    Who knew that a few scrap pieces of Dynamat Xtreme would result in Such Good Sound?

    All this makes me wonder what delights are in store in the future, when I will be more dedicated to audio than I am now and when I will have a really nice stereo system with real, big-deal, high-end loudspeakers and spectacular 1000 watt monoblocks.

    References

    The-Hard-Goodbye-Pt.-2-Isolation-Tweaks

    The-Hard-Goodbye-Pt.-5-PS-Audio-PowerBase

    Episode-3-The-Return-Of-Digital-Cary-Audio-CD-306-Professional-Version
    "So hot it burns Mice!"~DK
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
    "Knowledge, without understanding, is a path to failure."~DK
    "Those who irrationally rail against something or someone that is no threat to them, actually desire (or desire to be like) the thing or person they are railing against."~DK
  • headrottheadrott Posts: 5,477
    edited October 2013
    Ray, do you think the bass articulation and speed were demininshed in you Cary CD/SACD player? Or, were they made more precise? I ask because I noticed a tightening of the bass and making it more precise from adding dynamat xtreme in and as much from adding the Marigo TRi Mystery Feet underneath my Theta Jade Transport, the VXi Mystery Feet under my Vk-200 amp, Marigo Audio "Bear Feet" (a slightly older version of the Mystery Feet) under my VK-31 pre-amp, and some TRi Mystery Feet under my Denon DCD-3000 to what I canged into an SACD transport by adding a set of wires and an NE8FDV-Y110-B Neutrik Ethercon jack.

    I will "steal" your supremely nicely coined phrase Ray: "Such good sound" :wink::smile:
    Relayer-Big-O-Poster.jpg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion." :\
    My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....


    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee
  • DarqueKnightDarqueKnight Posts: 6,629
    edited October 2013
    headrott wrote: »
    Ray, do you think the bass articulation and speed were demininshed in you Cary CD/SACD player? Or, were they made more precise? I ask because I noticed a tightening of the bass and making it more precise from adding dynamat xtreme in and as much from adding the Marigo TRi Mystery Feet underneath my Theta Jade Transport...:

    Bass articulation an speed were diminished immediately after adding Dynamat, then improved over a few hours to the point where it was better than the pre-Dynamat performance.
    "So hot it burns Mice!"~DK
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
    "Knowledge, without understanding, is a path to failure."~DK
    "Those who irrationally rail against something or someone that is no threat to them, actually desire (or desire to be like) the thing or person they are railing against."~DK
  • headrottheadrott Posts: 5,477
    edited October 2013
    Bass articulation an speed were diminished immediately after adding Dynamat, then improved over a few hours to the point where it was better than the pre-Dynamat performance.

    Thanks Ray. I noticed that after I posted my reply. Sorry for the waste of time in my question. Why do you think the bass improved after a couple hours? Does the Dynamat Xtreme need to "settle in" before improving the audio? I'm interested in your thoughts.
    Relayer-Big-O-Poster.jpg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion." :\
    My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....


    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee
  • F1nutF1nut Posts: 43,443
    edited October 2013
    As usual, excellent write up.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."


    President of Club Polk

  • DarqueKnightDarqueKnight Posts: 6,629
    edited October 2013
    headrott wrote: »
    Thanks Ray. I noticed that after I posted my reply. Sorry for the waste of time in my question.

    No prob. It's a long read and most people only like to look at the pretty pictures. :smile:
    headrott wrote: »
    Why do you think the bass improved after a couple hours? Does the Dynamat Xtreme need to "settle in" before improving the audio?

    Yes:
    There was more tactile sensation and image weight, but I was very disappointed that bass detail, bass speed and bass articulation was noticeably diminished. I did not know if this was something permanent or if it was a matter of the player needing to "re-settle" or "re-break in". The late D. J. Kasser [of Black Diamond Racing isolation products] informed me that components usually need to re-settle or break in all over again once their mechanical vibration environment is changed. I was prepared to wait a couple of days to see if the bass improved, otherwise, the Dynamat was coming off. The bass aberrations went away after 5 hours of play time and bass performance was improved over the non-Dynamat performance after 10 hours of play time.
    "So hot it burns Mice!"~DK
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
    "Knowledge, without understanding, is a path to failure."~DK
    "Those who irrationally rail against something or someone that is no threat to them, actually desire (or desire to be like) the thing or person they are railing against."~DK
  • DarqueKnightDarqueKnight Posts: 6,629
    edited October 2013
    nbrowser wrote: »
    DK, based on your write ups re:amp and player treatments, I'm now considering dynamatting the interior of my HK 3490 as it sits relatively close to one of my RTiA7 towers. Just wondering, is there an approved method of capacitor discharge to kind of make working inside a little safer ?

    Typically a bleeder resistor is used, but you will need to contact the manufacturer to ask what type and value of resistor is required and the recommended connection point.
    "So hot it burns Mice!"~DK
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
    "Knowledge, without understanding, is a path to failure."~DK
    "Those who irrationally rail against something or someone that is no threat to them, actually desire (or desire to be like) the thing or person they are railing against."~DK
  • headrottheadrott Posts: 5,477
    edited October 2013
    No prob. It's a long read and most people only like to look at the pretty pictures. :smile:

    LOL! Guilty on this one! I almost always read all of your reviews, but did not on this one. Obviously, I was jumping to conclusions and trying to "figure things out" by asking questions. Thanks for the response and pointing me to the answer Ray. I appreciate the time and effort you put out.
    Relayer-Big-O-Poster.jpg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion." :\
    My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....


    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee
  • drumminmandrumminman Posts: 3,372
    edited October 2013
    Nice write up Raife. It's really curious that the character of the bass changed for the worse and then improved. Trying to wrap my brain around that.
    "Science is suppose to explain observations not dismiss them as impossible" - Norm on AA; 2.3TL's w/sonicaps/mills/jantzen inductors, Gimpod's boards, Lg Solen SDA inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR BP's, upgraded IC Cable, Black Hole Damping Sheet strips, interior of cabinets sealed with Loctite Power Grab, AI-1 interface with 1000VA A-L transformer
  • tonybtonyb Posts: 31,715
    edited October 2013
    Nice write up as usual DK, you sure leave no stone unturned in doing these. BTW, that Cary 306.....a helluva player kids.
    HT SYSTEM-
    Sony 850c 4k
    Pioneer elite vhx 21
    Sony 4k BRP
    SVS SB-2000
    Polk Sig. 20's
    Polk FX500 surrounds

    Cables-
    Acoustic zen Satori speaker cables
    Acoustic zen Matrix 2 IC's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable

    Kitchen

    Sonos zp90
    Grant Fidelity tube dac
    B&k 1430
    Tad 803 speakers
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