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SR60-Mod - Page 248  

post #3706 of 5003

anybody ever attempt to duplicate the prototype GS1000 "salad bowl"?

 

 

 

Quote:
grado-42.jpg

Prototype GS 1000 "Salad Bowls."

 

post #3707 of 5003

Those pads look like flats glued over the regular bowls... is anyone else seeing that?

post #3708 of 5003
Quote:
Originally Posted by BobSaysHi View Post

Those pads look like flats glued over the regular bowls... is anyone else seeing that?


I didn't quite notice it from that perspective.  However, the mention of "salad bowl" did make me hungry. wink.gif

 

I did a bit of due diligence today on wood working equipment.  Well, first of all, I know my wife is going to require that I shed some of the tools in our garage.  I don't figure I'll use the big (portable) Craftsman table saw anymore since I don't intend to build anymore subwoofers.  Man, you can save some major $$ building a home sub yourself, but that MDF dust goes E-V-E-R-Y-W-H-E-R-E.  I did locate some smaller lathes for turning some cups as well as drill presses for the respective work.  Now that I have some numbers in mind for tools, I'll have to see what it's like to capably get my hands on various species of wood to work with some cups.  Taking on a project such as this doesn't intimidate me at all as my father was a carpenter and I've done plenty of handy-man projects (even at the professional level) as well as lots of custom options in our home.  Now, it's just a matter of when I want to take up this topic with my wife.  I suspect it might be best to approach her closer to Father's day when she's looking for gifts and when I ask for money towards the tools it will be a much easier proposition.

 

Now, that would still put me in kind of quandary.  We're having a local Headphone GTG in my general area during the middle of June.  Getting the tools at the beginning of June means that I essentially wouldn't have enough time to turn out some specs and models for the show.  Instead, I'd have to attend as a spectator - which, still wouldn't be a bad option.

 

post #3709 of 5003
Quote:
Originally Posted by Bilavideo View Post

 


 

 

Carbon fiber/fibre would be fantastic.  They make cellos out of it.  It's expensive but its acoustic properties are far superior to plastic.  I'm enamored with the aluminum housing of the PS1 and HP1000.  If I had an "in" with the world of metal machining, I'd be all over that.  But carbon fiber represents a cool opportunity, since it's something you can mold right off any model, provided you're willing to cure and cut it along the way.  The interesting thing about that is that ALL of the Grados between the SR60 and the SR225 were patterned after the PS1/HP1000 frames.  

 

Take a close look; the plastic Grados are basically an attempt to bring these aluminum wonders down to the people.  Much of the Grado product line tiers downward instead of up - taking as its model, the premiere product and then cutting away at the layers to provide some version of it at each price level.  This is why critics scratch their heads and wonder how any Grado fan can tell these products apart (It takes a bit of discernment to do that, and it helps to be a fan with a little too much time on your hands).  Consider the fact that Grado came out with the RS1 before introducing the RS2, or that Grado came out with the PS1000 before it came out with the HF2.  Grado scales down much more than he scales up.  He delivers the primo product to his version of the "early adopters" and then provides a knock-off of his own classic product - at a lower price tier.  The "i" series Grados are largely mock-ups of the 325, with its yo-yo looking contours.  Ironically, while the PS1000 is modeled after the GS1000, the GS1000 bears an interesting resemblance to the 325 - and the aluminum shells on my PS1000 are - in some ways - massive versions of the 325 shell.

 

Something in me just adores the aluminum housing of the PS1 and HP1000.  If I could machine something like that, I'd be in hog heaven.  But with carbon fiber, you can actually take anything between the SR60 and the SR225 and use it as a model.  Correct me if I'm wrong, but it seems like whatever you fabricated from the pre-"i" versions would be no less a copy of the PS1 and HP1000 models than if you'd used them as molds.  Carbon fiber would be a very cool threshold to cross.  I want to do it.  I just need to do wood first.


So would replacing the plastic chamber of the SR80i with a identical in design Alloy chamber achieve a better acoustic performance ?

 

There is no doubt the open chamber design has a major effect on the sound of the Grado's .And venting also seems like a plausible way of opening up the bass . I can prove that to myself by just  cupping my hands over the ends of the Grado's .The low frequencies get squashed out significantly .

 

I'm wanting to add >slightly< more bass and reign in the high frequencies . I'm thinking venting and Dynamat should achieve these results .

 

Will using Alloy add a little better sonic performance as the chamber would be able to resonate more in time with the speakers <<< does that sound correct ?.

 

 

 


Edited by ib1dance - 5/8/11 at 2:55pm
post #3710 of 5003
Quote:
Originally Posted by ib1dance View Post




So would replacing the plastic chamber of the SR80i with a identical in design Alloy chamber achieve a better acoustic performance ?

 

There is no doubt the open chamber design has a major effect on the sound of the Grado's .And venting also seems like a plausible way of opening up the bass . I can prove that to myself by just  cupping my hands over the ends of the Grado's .The low frequencies get squashed out significantly .

 

I'm wanting to add >slightly< more bass and reign in the high frequencies . I'm thinking venting and Dynamat should achieve these results .

 

Will using Alloy add a little better sonic performance as the chamber would be able to resonate more in time with the speakers <<< does that sound correct ?.

 

 

 



Just poke the holes.. You can cover them back up if you need to :D

post #3711 of 5003
I can't believe how terrible my headphones sound compared to those speakers I heard on friday. Granted, it's a $6000+ rig through the speakers, so it's pretty unfair to compare.

Now I have to get these Jatoba shells going for sure. I kinda ruined the first one, so this is going to be a challenge to make sure I don't do that again with that router's annoying stop setup.
post #3712 of 5003
Quote:
Originally Posted by JamesMcProgger View Post

 

what wood is that?



It's African Blackwood Prog.

 

 

 

post #3713 of 5003

I was actually considering installing wooden cups, removing loin cloth, poking holes, and dyanamating all to say the right driver and leaving the left driver stock and listening for about ten minutes in mono mode just so I can see the difference. Does this sound like a stupid idea?

post #3714 of 5003
Quote:
Originally Posted by ib1dance View Post

Will using Alloy add a little better sonic performance as the chamber would be able to resonate more in time with the speakers <<< does that sound correct ?.

 

 


I'm not sure if this would really be the case.  There are those of us with the SR325 Grados that are anxious to install wooden liners to see where the performance leads.

 

post #3715 of 5003
Thread Starter 

This weekend, I got my feet wet with the new lathe.  I have a much bigger one (under a tarp in the back yard) but I wanted something smaller to get started with.  This one is very basic, but it's the next logical step from the various layered cuts going into my drill-pressed shells.  A number of you have much better lathes, but that's okay.  My role, in all of this, was not to make the best shells but to act as cheerleader for those of us who might never got off the bench without a little encouragement.

 

Lathe.jpg

 

This is not my work area out in the carport.  This is my dining-room table.  My sweet wife, on the weekend of Mother's Day, let me use the dining room table to make my first cuts, so I wouldn't be standing on my bum foot.

 

three blind mice.jpg

 

Here are my first experiments with the lathe.  I'm not very good yet.  I'm just finding my feet.  I'm not a woodworker.  I'm just an idiot who is crazy about headphones.  But even from these first pics, it's clear what advantages a lathe brings to the table.

 

three blind mice 2.jpg

 

Closer up, the imperfections of these first efforts are more apparent.  With a good part of my weekend cutting shells and helping my sons pull off a terrific Mother's Day for the wife, I had my hands full learning how not to kill myself with a lathe.  YouTube videos were a real godsend, especially one involving a very generous redneck whose expertise in woodworking must rival that of the best scholars dissecting Shakespeare.  Right now, my biggest challenge is to find a way to set up and center the shells I've previously cut with the drill press.  Typically, you lathe straight from a turning block, but I still think the drill press has its uses (and is universally unsung in its true versatility).  I'd like to be able to slide on what I've already cut from the drill press if I can find a decent way to center my doughnuts on a proper chuck.  There's a chuck online for $69.  I'll take a look at that.  The better lathes, like a $600 mini-lathe I was salivating over, have a robotic grip that is totally the sh!@#.

 

I almost bought it for $400 but if I did that, Mother's Day weekend, I'd be sleeping in my car, which is a two-seater.

 

first shell.jpg

 

If this is the worst shell I ever lathe, I'm hopeful that my best will be a little better.  It's a whole new world, but I'm feeling adventurous - and I now have a cane!

post #3716 of 5003
Quote:
Originally Posted by sml1226 View Post

I can't believe how terrible my headphones sound compared to those speakers I heard on friday. Granted, it's a $6000+ rig through the speakers, so it's pretty unfair to compare.

Now I have to get these Jatoba shells going for sure. I kinda ruined the first one, so this is going to be a challenge to make sure I don't do that again with that router's annoying stop setup.

 

I remember a similar situation about 6 years ago.  A pair of 700-series B&W speakers, a McIntosh (mega) amplifier and a not-so-bad CD player.  I think the "combo" price was somewhere in the $7,000 range.  The guy at the store told me they could work out a payment plan of $250 a month for x number of months.  I heard Henry Mancini's "The Pink Panther" being played.  I don't think I've ever heard such a great system in my life.  Or, at least I hadn't at the time.  Since that time, I've heard some really mega-buck systems ($20K and up), and thought they were good.  However, something intimate was missing, though.  I'll never forget that McIntosh and B&W combo, though.  Quite impressive.  Now, though, I'm happy with my headphones.  I can get my sound to a quite enjoyable level that provides much satisfaction.

 

At the moment, I live in a 4,000 s.f. house, which is pretty much consumed (err ... I mean decorated) in each and every room and there's no place for me to have a main level listening room, so my headphones give me peace.  My system  of speakers, amp, etc. resides in my man cave, which is downstairs.

 


 

 

post #3717 of 5003

has anyone made one of these guys? i snagged this kit from ebay thinking it would come with step by step directions. has anyone bought one of these ebay kits from china? 

 

i'm a straight up noob, but i thought this would be a decent project for my first diy amp. 

 

any thoughts and suggestions would be greatly appreciated.

 

Photo on 2011-05-08 at 18.jpgPhoto on 2011-05-08 at 18.jpg

 

post #3718 of 5003

Hey Now,

 

I got a similar amp kit from Electric Sumo, the Banzai Cmoy.  It was easy to build and sounds decent. I swapped out opamps to an LME4562. Sounds better now 8^). I stuffed it into an Altoids tin.

 

The instruction sheet is easy enough to follow. It was my first DIY project. There is lots of info on building a Cmoy in You Tube and on websites. Easy peasy. Have fun. I don't use it now so I am getting ready to gift it away. 

 

--

Finest kind,

Chris

post #3719 of 5003
Quote:
Originally Posted by ccklone View Post

I swapped out opamps to an LME4562. Sounds better now 8^). I stuffed it into an Altoids tin.


Using that particular op amp (LM4562) basically turned your CMOY into a Grado RA1 "clone".  Not bad for a few bucks in supplies.  The Altoids tins appear to have been the most often used cases for these amps.  However, I did see one guy selling some pre-assembled ones with the tins from mints that they only sell on the Disney cruise ship.  Kind of neat - but, if you're listening in the dark, who'd really know what kind of tin it was in?  

 

post #3720 of 5003
Looks like a fun Project! You can find lots of help/tips with it in the DIY forum, and I'll bet someone there has built that one or one very similar!
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