Dynamat for Jolida

ohskigod

I have a Jolida CD player and love it. Its mostly stock, acept that I changed tubes (EI elite gold) and power cord (PS Audio power punch....thanks Russ)

anyhoo, I look at the other mods that can be done, like Jesse's hot rod stuff, but know I am no where ready to do that, but I do remember being told that Dynamat does alot to lower the noise floor.

question is, where do I put the dynamat? this might sound like a stupid question, but I want to make sure I dont do anything stupid to damage the unit.

any help would be sweet

thanks

Ricardo

You need to put it all around the unit. Some people put it on the inside, but you'll get the same results if you do it on the outside; you will also save some time doing it this way. You just need to make sure you leave a hole where the remote sensor is in the front panel.

Early B.

FWIW, I put Dynamat Extreme throughout my Bada tube CDP and didn't notice any difference at all. Consider tube dampers.

hearingimpared

I just purchased a shitload of Dynamat to put on the basket spokes on the mid-drivers and passive radiators ala Jesse.

F1nut

Lou,

Line the inside of the top cover, leaving the vent slots free and a space of 3/4" around all the edges and a space for the interior dividing walls. Then line the left and right interior walls as well as both sides of the dividing walls. I put some on the transformers and bare spots on the back wall and the interior bottom too.

ohskigod

sounds like a plan

oh, another important question, where does one attain Dynamat? Partsexpress?

WilliamM2

You can get it at most car stereo installation shops. Some people use Ice shield instead (roofing product). It's not quite as dense though.

AndyGwis

You guys are about 2 steps away from opening up your components and wrapping every internal wiring with "special paper," aren't you?

I am going to drywall my components this weekend, then sheetrock my speakers next weekend. Any favorable reviews on suppliers? Maybe Tylex?

ohskigod

actually, many people have notice a difference, particularly in the Jolida, when dynamat is applied. it will certainly not be applied to the wires, just to the case as Jesse specified.

I had a bit of a noise problem in my Anthem tube pre, but instead of going the dynamat route, I used tube dampers, it woked.

I think I would shy away from the use of sheetrock, but hey, your stuff is your stuff. go with 3/8ths if you do :rolleyes:

ohskigod

Early B. wrote: »

FWIW, I put Dynamat Extreme throughout my Bada tube CDP and didn't notice any difference at all. Consider tube dampers.

I would, but the tubes in the jolida have a cover, and have no room for a damper. i dont know if the cover acts as a damper or not.

I'm hesitant to take the metal cover off and leave them off to put on the damper.

Music Joe

I believe Dynamat may now market an improved version, but Cascade Audio VB-2 is why, CAE's product was out out when Dynamat still sucked,stinked,and came loose.
From the start CAE VB2 added very little mass,was odorless and stuck permanently adding excellent damping by converting vibration into heat. Mineral filled vinyl-copolymer is used in speaker cones too for low mass and excellent self damping characteristics.
My Nad cd player still in service was VB2'd (no heatgun application) over 10 years ago. It's cheap enough in quantity to use inside speaker cabinets as well. Good damping w/o adding lots of mass makes the music notes spring forth better and from a blacker background. I still think power first but as an easy kitchen table project for a steady hand there is improvement from footers and damping cd player cans. However overkill can darken the musicality.
Go in steps,to see how much vibration control is right,attack points in the large flat expanses and carefully on the disc tray and clamp bridge and near the transformer. You can use punchouts and scaps for caps and such.I would suggest not to cover whole panels. You can tap the chassis upper housing of a typical cd player before and after to ring test.


http://www.cascadeaudio.com/prod/vb2.html

http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=268-260

MacLeod

Dynamat is one of the greatest inventions and tools to come out of the 20th century and it does wonders for lowering the noise floor in a car but I dont see how it could affect HA.

Dynamat is made to add mass to a stucture to both quell vibration and resonance. You apply it to your doors for instance. I have 3 layers on my doors and 1 on the door skin. This gives the door panels much more mass and makes it much harder for vibrations from the speaker to resonate in the metal.

By adding it to the door skin, you again add much more mass to it than it had originally and the resonance from the speakers wont be able to cause it to buzz and rattle.

I dont see how wrapping the inards of a CD player with Dynamat could have any affect.

Putting Dynamat inside a speaker cabinet is a bad idea. Dynamat is much is reflective and can play havoc with standing waves inside the box and can have the same affect as using a smaller box. Now using it on the outside of a box does help by, again, adding mass to the cabinet, making it more rigid and less likely to flex. But, speaker cabinets of the quality you guys use shouldnt have any problem with flexing or lack or rigidity.

Ricardo

ohskigod wrote: »

I would, but the tubes in the jolida have a cover, and have no room for a damper. i dont know if the cover acts as a damper or not.

I'm hesitant to take the metal cover off and leave them off to put on the damper.

You can get that cover off; put it back if you ever ship it.

TroyD

Just be careful, if you are a dumbass like me and aren't careful and dynamat right up to the edge of the lid, getting the case on/off can be a REAL PITA.

That said, it's a pretty dramatic difference.

BDT

mulveling

MacLeod wrote: »

I dont see how wrapping the inards of a CD player with Dynamat could have any affect.

Since this is at least the 2nd comment to question this tweak, I thought it should be addressed. Now I'm *not* claiming there's a huge difference here as I've never tried it (though I have owned a JD100a). However, the reasoning behind this tweak is actually fairly sound...unlike the ERS paper tweaks and other extreme audiophile shenanigans.

All tubes are microphonic, to varying degrees. What this means is that they convert vibrational energy and add it in to the audio signal. That's genreally considered a bad thing. I've had tubes, otherwise incredible sounding, that made an audible, loudly amplified THUMP whenever you tapped the surface that the amp was resting on (even louder if you tap the amp or god forbid the tube itself). The NOS 6sn7 tubes are especially notorious for this. This is not a subtle effect in most cases. It's at least several orders of magnitude greater than whatever effect vibrations would have on a transistor (assuming there is any).

Anyways, the Jolida JD100a CD player discussed here uses tubes in the output stage - more specifically a pair of 12AX7's. Put 2 and 2 together; the Jolida's sound quality can be affected by stray vibrations. Stray vibrations could potentially come from 3 main sources:

* The mechanical movements in the CD transport
* Direct acoustic enegry from the speakers that's converted to vibration when the sound waves hit the chassis.
* Vibrations from the floor up into the audio stand (and hence CD player) that came from the speakers being coupled to the floor.

So, an application of vibration reduction products that reduce the effect of any 3 of these sources could have a real impact on sound quality. I can get away with using some great, albeit very microphonic, NOS tubes in my high-end headphone rig that wouldn't cut it in the speaker rig...because headphones won't shake the walls no matter how loud.

Also, I just realized that vibrations could potentially interfere with the transport pickup, so *theoretically* that could affect jitter in the digital signal...thus a potential source of quality degradation that would also affect non-tube CD players.

MacLeod

mulveling wrote: »

All tubes are microphonic, to varying degrees. What this means is that they convert vibrational energy and add it in to the audio signal. That's genreally considered a bad thing. I've had tubes, otherwise incredible sounding, that made an audible, loudly amplified THUMP whenever you tapped the surface that the amp was resting on (even louder if you tap the amp or god forbid the tube itself). Anyways, the Jolida JD100a CD player discussed here uses tubes in the output stage - more specifically a pair of 12AX7's. Put 2 and 2 together; the Jolida's sound quality can be affected by stray vibrations. Stray vibrations could potentially come from 3 main sources:

I can buy that. If tubes pick up vibrations and transmit them thru the signal and out to the speakers then damping that component would definitely isolate it from induced vibrations and noise issues.

F1nut

Just to clarify.....

Dynamat Extreme is what you want. You can line the inside of covers, case, etc. of any piece of gear, but do not line your speakers with it. It's purpose is to add mass and to stop external vibrations from reaching the internal parts of said piece as covered in Mulveling's excellent post.

It's also excellent at preventing ringing on stamped steel speaker baskets such as those in SDA speakers. You put it on the basket, no where else.

As for the metal tube dampers in the Jolida, it's a personel choice, but leave them on unless you Dynamat the piece or replace them with something like Herbie's. I removed mine including the base section when I did the mods. With all the Dynamat I used to line the cover/case there are no vibrations getting inside and I liked the look better. I thought about adding Herbie's, but haven't got around to it.

Dynamat is available from these fine folks. http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=12647

MacLeod

Best way to get Dynamat is thru your local car stereo shop. You can get it cheaper online but if youre not going to be buying 100 ft2 to do a whole car, you wont really save any money.

The best thing to get is the Speaker Kit. You can also get the Dynamat Original as well for a little less. Its a pair of 10"x10" pieces of Dynamat Extreme and can usually be had for $20 max. You can find it online cheaper but after you pay the minimum shipping of $12 or so, youre not really saving any money. Plus you have to wait for it to get there.

Pep Boys also has some similar stuff made by Lightning Audio for $16 for the speaker kits. Since youre not talking about major vibrations, that should work just as well if youre wanting to save $4.

hearingimpared

ohskigod wrote: »

sounds like a plan

oh, another important question, where does one attain Dynamat? Partsexpress?

This was the cheapest place I could find for it.

Some shite head has it on ebay for $37.95 with $25 shipping from Jersey. I wrote to the idiot and told him that I was in Delaware and his response was, "shipping not negotiable."

Shipping for the Dynamat that I ordered was $7 three day.

hearingimpared

My .02. I bought sorbothane sheets (lots of it) back in the mid 80s (I still have some). I used in on everything (except the inside of speaker cabinets) and I didn't and don't use tubes and I thought that it was the greatest invention ever. If Dynamat has the dampening power that sorbothane sheets have then I agree with MacLeod. I bought the Dynamat at Jesse's suggestion to dampen the ringing of the driver basket spokes in my 1.2 TLs but I can tell you I will be lining the inside of everything (except speaker cabinets) that can possibly vibrate.

You have to be careful though, my preamp case was designed to resonate at a certain frequency to keep the vibs away from the main components inside. When I sorbothaned the preamps case it sounded like pure shite!!! Muddy mids and bass, image smeared etc. I wrote about this once before here and was called a bullshitter. . . come to my home, I'll let you hear the preamp without the dampening and then with it, you will be shocked at what you hear.

Anyhoo I can wait till this new stuff arrives!

MacLeod

hearingimpared wrote: »

This was the cheapest place I could find for it.

Some shite head has it on ebay for $37.95 with $25 shipping from Jersey. I wrote to the idiot and told him that I was in Delaware and his response was, "shipping not negotiable."

Shipping for the Dynamat that I ordered was $7 three day.

You realize how much that is?!? ONE of those kits is enough to completely do TWO car doors!

How big is this CD player?

hearingimpared

MacLeod wrote: »

You realize how much that is?!? ONE of those kits is enough to completely do TWO car doors!

How big is this CD player?

WAAAAAAAAAAAAAAAAAA, I do everything to excess!!!!:D Like I said I still have sorbothane sheets letover from the 80s, hey, come to think of it I have somewhere in the number of 25 to 30 sorbothane pods too!!!

F1nut

You realize how much that is?!? ONE of those kits is enough to completely do TWO car doors!

LOL...I've gone thru two of those kits, need to order another one and none of it went into a vehicle.

pearsall001

hearingimpared wrote: »

WAAAAAAAAAAAAAAAAAA, I do everything to excess!!!!:D Like I said I still have sorbothane sheets letover from the 80s, hey, come to think of it I have somewhere in the number of 25 to 30 sorbothane pods too!!!

Hey Joe, with all that sorbathane stuff you could mold yourself a new ear tweak.LOL!!!:eek:

hearingimpared

pearsall001 wrote: »

Hey Joe, with all that sorbathane stuff you could mold yourself a new ear tweak.LOL!!!:eek:

You big dolt. . . the sorbothane would absorb the sound and not let it get into my ear!@!!!:D

pearsall001

hearingimpared wrote: »

You big dolt. . . the sorbothane would absorb the sound and not let it get into my ear!@!!!:D

But if you mold it just right, it'll only filter out all the pops, hisses & tics from that marvelous vinyl format. LOL!!!

hearingimpared

pearsall001 wrote: »

But if you mold it just right, it'll only filter out all the pops, hisses & tics from that marvelous vinyl format. LOL!!!

I don't have any pops, hisses or ticks eminating from my vinyl format. . . I think what you were hearing was the rustling of the hair in your ears!!!