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Joseph Grado Signature Product "HP2i" upgraded HP 1000 headphone; information journal and... - Page 17

post #241 of 248
Thread Starter 
They do that:

 

+ ()()() ^_^ ()()() +

- )()()( ^_^ )()()( -

 

+ ()()() o_0 )()()( -

 

- )()()( 0_o ()()() +

 

 


 

From Tyll's review on an out-of-polarity headphone (http://www.innerfidelity.com/content/headphones-united-airlines-flight-962), in which he did describe the sound repercussion of such a mistake in wiring.


Edited by devouringone3 - 5/14/14 at 1:52pm
post #242 of 248
Quote:
Originally Posted by airo View Post

Sorry if I'm in the wrong thread but I'm very curious what that polarity switch does on this pair of headphones, does it change the sound signature in any way? I'm not quite sure what it means but it's so unique


 As far as I know the polarity switches were intended mainly for the Pro audio sector, used in some cases by sound engineers. 


Edited by Mortalcoil - 5/4/14 at 3:13am
post #243 of 248
Thread Starter 

As of May 2014 tamahome77 received his pair from Joseph Grado and he put for sale: http://www.head-fi.org/t/717257/fs-grado-hp1000i-hp2i-upgraded-hp1000-with-improved-earpads

 

Total price of the upgrade: USD 2000$ excluding shipping.


Edited by devouringone3 - 6/16/14 at 11:15pm
post #244 of 248

Good to hear he finally got them back.

post #245 of 248

Glad to know he got it, especially after undergoing that harrowing ordeal.

post #246 of 248

And it looks like isn't worth the upgrade..

post #247 of 248

I feel awful for the guy. Shame on you, Joe Grado -- what was done is criminal. Even if he gets asking price, the net result of the mod is that he only gets $600 back from his (probably wonderful) stock HP-2. They were worth a LOT more than that.


Edited by mulveling - 6/19/14 at 9:00am
post #248 of 248
Quote:
Originally Posted by parbaked View Post
 

To be fair the HPA-1/2 uses significantly, not slightly, better components and more of them (separate power supplies for battery and PSU)

I'm not sure you realize the the op-amp and circuits are hidden underneath the black metal shield in the pics you posted above.

 

The RA-1 looks pretty cheap in comparison.

 

Just for example the HPA-2 uses a $50 pot (Alps RK40) and boutique "film & foil" caps ; the RA-1 uses a $2 pot and Solen caps.

 

 

I don't think the RA-1 looks nearly as good inside:

 

 

Joe built the HPA-2 to be the best battery powered headphone amp he could build.

John designed the RA-1 to be an inexpensive replacement.

I've owned both and the HPA-1/2 is much better, especially with the HP-1000

Just my experience...

 

 

I own the HPA-2 and RA1 battery powered version. I've never tried the HPA-2 on batteries...and maybe this is why, but I prefer the sound of the RA1. This probably is the reason why since I don't have very "clean" power where I live.

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